monitor.cc revision 956a5228276693a7317ae6b41bfe7a7f0f3cbe6b
15f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes/* 25f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Copyright (C) 2008 The Android Open Source Project 35f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 45f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Licensed under the Apache License, Version 2.0 (the "License"); 55f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * you may not use this file except in compliance with the License. 65f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * You may obtain a copy of the License at 75f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 85f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * http://www.apache.org/licenses/LICENSE-2.0 95f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 105f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Unless required by applicable law or agreed to in writing, software 115f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * distributed under the License is distributed on an "AS IS" BASIS, 125f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 135f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * See the License for the specific language governing permissions and 145f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * limitations under the License. 155f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 165f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 1754e7df1896a4066cbb9fe6f72249829f0b8c49c6Elliott Hughes#include "monitor.h" 185f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 1908fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes#include <vector> 2008fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 2176b6167407c2b6f5d40ad895b2793a6b037f54b2Elliott Hughes#include "base/mutex.h" 221aa246dec5abe212f699de1413a0c4a191ca364aElliott Hughes#include "base/stl_util.h" 2333dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao#include "class_linker.h" 244f6ad8ab428038129b2d0d6c40b7fd625cca15e1Ian Rogers#include "dex_file-inl.h" 2508fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes#include "dex_instruction.h" 26d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers#include "lock_word-inl.h" 27ea46f950e7a51585db293cd7f047de190a482414Brian Carlstrom#include "mirror/art_method-inl.h" 284f6ad8ab428038129b2d0d6c40b7fd625cca15e1Ian Rogers#include "mirror/class-inl.h" 2905f3057d6a4d23d712092ccd36a531590bff323bIan Rogers#include "mirror/object-inl.h" 302dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers#include "mirror/object_array-inl.h" 3100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers#include "scoped_thread_state_change.h" 325f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes#include "thread.h" 338e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes#include "thread_list.h" 3408fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes#include "verifier/method_verifier.h" 35044288fb8f69e154862763a6b3bfea2bac1b397eElliott Hughes#include "well_known_classes.h" 365f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 375f79133a435ebcb20000370d56046fe01201dd80Elliott Hughesnamespace art { 385f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 395f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes/* 40d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * Every Object has a monitor associated with it, but not every Object is actually locked. Even 41d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * the ones that are locked do not need a full-fledged monitor until a) there is actual contention 42d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * or b) wait() is called on the Object. 435f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 44d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * For Android, we have implemented a scheme similar to the one described in Bacon et al.'s 45d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * "Thin locks: featherweight synchronization for Java" (ACM 1998). Things are even easier for us, 46d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * though, because we have a full 32 bits to work with. 475f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 48d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * The two states of an Object's lock are referred to as "thin" and "fat". A lock may transition 49d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * from the "thin" state to the "fat" state and this transition is referred to as inflation. Once 50d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * a lock has been inflated it remains in the "fat" state indefinitely. 515f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 52d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * The lock value itself is stored in mirror::Object::monitor_ and the representation is described 53d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * in the LockWord value type. 5454e7df1896a4066cbb9fe6f72249829f0b8c49c6Elliott Hughes * 555f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Monitors provide: 565f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * - mutually exclusive access to resources 575f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * - a way for multiple threads to wait for notification 585f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 595f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * In effect, they fill the role of both mutexes and condition variables. 605f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 61d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * Only one thread can own the monitor at any time. There may be several threads waiting on it 62d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * (the wait call unlocks it). One or more waiting threads may be getting interrupted or notified 63d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * at any given time. 645f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 6554e7df1896a4066cbb9fe6f72249829f0b8c49c6Elliott Hughes 66fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughesbool (*Monitor::is_sensitive_thread_hook_)() = NULL; 67fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughesuint32_t Monitor::lock_profiling_threshold_ = 0; 6832d6e1e5654433d7eadede89e1c770b2c839aee9Elliott Hughes 69fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughesbool Monitor::IsSensitiveThread() { 70fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes if (is_sensitive_thread_hook_ != NULL) { 71fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes return (*is_sensitive_thread_hook_)(); 72fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes } 73fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes return false; 74fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes} 75fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes 764dd9b4d95eec9db5338fb9bf132f9bb8facf6cf4Elliott Hughesvoid Monitor::Init(uint32_t lock_profiling_threshold, bool (*is_sensitive_thread_hook)()) { 77fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes lock_profiling_threshold_ = lock_profiling_threshold; 78fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes is_sensitive_thread_hook_ = is_sensitive_thread_hook; 7932d6e1e5654433d7eadede89e1c770b2c839aee9Elliott Hughes} 8032d6e1e5654433d7eadede89e1c770b2c839aee9Elliott Hughes 81ef7d42fca18c16fbaf103822ad16f23246e2905dIan RogersMonitor::Monitor(Thread* self, Thread* owner, mirror::Object* obj, int32_t hash_code) 8200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers : monitor_lock_("a monitor lock", kMonitorLock), 83d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_contenders_("monitor contenders", monitor_lock_), 8446bc778f1feed02b20d25e3d03470c93ca2c0506Mathieu Chartier num_waiters_(0), 8500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers owner_(owner), 865f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes lock_count_(0), 8794f7b49578b6aaa80de8ffed230648d601393905Hiroshi Yamauchi obj_(GcRoot<mirror::Object>(obj)), 885f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes wait_set_(NULL), 89ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier hash_code_(hash_code), 9033dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao locking_method_(NULL), 91ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers locking_dex_pc_(0), 9274240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe monitor_id_(MonitorPool::ComputeMonitorId(this, self)) { 9374240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe#ifdef __LP64__ 9474240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe DCHECK(false) << "Should not be reached in 64b"; 9574240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe next_free_ = nullptr; 9674240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe#endif 9774240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe // We should only inflate a lock if the owner is ourselves or suspended. This avoids a race 9874240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe // with the owner unlocking the thin-lock. 9974240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe CHECK(owner == nullptr || owner == self || owner->IsSuspended()); 10074240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe // The identity hash code is set for the life time of the monitor. 10174240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe} 10274240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe 10374240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas GampeMonitor::Monitor(Thread* self, Thread* owner, mirror::Object* obj, int32_t hash_code, 10474240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe MonitorId id) 10574240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe : monitor_lock_("a monitor lock", kMonitorLock), 10674240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe monitor_contenders_("monitor contenders", monitor_lock_), 10774240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe num_waiters_(0), 10874240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe owner_(owner), 10974240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe lock_count_(0), 11094f7b49578b6aaa80de8ffed230648d601393905Hiroshi Yamauchi obj_(GcRoot<mirror::Object>(obj)), 11174240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe wait_set_(NULL), 11274240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe hash_code_(hash_code), 11374240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe locking_method_(NULL), 11474240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe locking_dex_pc_(0), 11574240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe monitor_id_(id) { 11674240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe#ifdef __LP64__ 11774240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe next_free_ = nullptr; 11874240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe#endif 119d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // We should only inflate a lock if the owner is ourselves or suspended. This avoids a race 120d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // with the owner unlocking the thin-lock. 121ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers CHECK(owner == nullptr || owner == self || owner->IsSuspended()); 122ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // The identity hash code is set for the life time of the monitor. 123d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers} 124d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers 1254e6a31eb97f22f4480827474b30b9e64f396eaceMathieu Chartierint32_t Monitor::GetHashCode() { 1264e6a31eb97f22f4480827474b30b9e64f396eaceMathieu Chartier while (!HasHashCode()) { 1273e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers if (hash_code_.CompareExchangeWeakRelaxed(0, mirror::Object::GenerateIdentityHashCode())) { 1284e6a31eb97f22f4480827474b30b9e64f396eaceMathieu Chartier break; 1294e6a31eb97f22f4480827474b30b9e64f396eaceMathieu Chartier } 1304e6a31eb97f22f4480827474b30b9e64f396eaceMathieu Chartier } 1314e6a31eb97f22f4480827474b30b9e64f396eaceMathieu Chartier DCHECK(HasHashCode()); 1323e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers return hash_code_.LoadRelaxed(); 1334e6a31eb97f22f4480827474b30b9e64f396eaceMathieu Chartier} 1344e6a31eb97f22f4480827474b30b9e64f396eaceMathieu Chartier 135d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogersbool Monitor::Install(Thread* self) { 136d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu(self, monitor_lock_); // Uncontended mutex acquisition as monitor isn't yet public. 137ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier CHECK(owner_ == nullptr || owner_ == self || owner_->IsSuspended()); 13800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Propagate the lock state. 1394cba0d979a11f955e6ec3c0f1bf61478af7aa810Hiroshi Yamauchi LockWord lw(GetObject()->GetLockWord(false)); 140ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier switch (lw.GetState()) { 141ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kThinLocked: { 142ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier CHECK_EQ(owner_->GetThreadId(), lw.ThinLockOwner()); 143ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier lock_count_ = lw.ThinLockCount(); 144ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier break; 145ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier } 146ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kHashCode: { 1473e5cf305db800b2989ad57b7cde8fb3cc9fa1b9eIan Rogers CHECK_EQ(hash_code_.LoadRelaxed(), static_cast<int32_t>(lw.GetHashCode())); 148ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier break; 149ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier } 150ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kFatLocked: { 151ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // The owner_ is suspended but another thread beat us to install a monitor. 152ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier return false; 153ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier } 154ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kUnlocked: { 155ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier LOG(FATAL) << "Inflating unlocked lock word"; 156ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier break; 157ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier } 158590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier default: { 159590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier LOG(FATAL) << "Invalid monitor state " << lw.GetState(); 160590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier return false; 161590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 162d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 163d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LockWord fat(this); 164d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Publish the updated lock word, which may race with other threads. 165228602f562f1d130d06e60a98752d99c2d467d6aIan Rogers bool success = GetObject()->CasLockWordWeakSequentiallyConsistent(lw, fat); 16600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Lock profiling. 1679728f91a63016136261231ff5213bde703bd27b6Mathieu Chartier if (success && owner_ != nullptr && lock_profiling_threshold_ != 0) { 1686ec8ebd178ed39aa09e4c7fad194900114c4121aAndreas Gampe // Do not abort on dex pc errors. This can easily happen when we want to dump a stack trace on 1696ec8ebd178ed39aa09e4c7fad194900114c4121aAndreas Gampe // abort. 1706ec8ebd178ed39aa09e4c7fad194900114c4121aAndreas Gampe locking_method_ = owner_->GetCurrentMethod(&locking_dex_pc_, false); 17100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 172d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return success; 1735f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 1745f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 1755f79133a435ebcb20000370d56046fe01201dd80Elliott HughesMonitor::~Monitor() { 176590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Deflated monitors have a null object. 1775f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 1785f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 1795f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes/* 1805f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Links a thread into a monitor's wait set. The monitor lock must be 1815f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * held by the caller of this routine. 1825f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 1835f79133a435ebcb20000370d56046fe01201dd80Elliott Hughesvoid Monitor::AppendToWaitSet(Thread* thread) { 1845f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(owner_ == Thread::Current()); 1855f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(thread != NULL); 186dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers DCHECK(thread->GetWaitNext() == nullptr) << thread->GetWaitNext(); 1875f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (wait_set_ == NULL) { 1885f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes wait_set_ = thread; 1895f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 1905f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 1915f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 1925f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // push_back. 1935f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes Thread* t = wait_set_; 194dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers while (t->GetWaitNext() != nullptr) { 195dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers t = t->GetWaitNext(); 1965f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 197dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers t->SetWaitNext(thread); 1985f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 1995f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 2005f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes/* 2015f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Unlinks a thread from a monitor's wait set. The monitor lock must 2025f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * be held by the caller of this routine. 2035f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 2045f79133a435ebcb20000370d56046fe01201dd80Elliott Hughesvoid Monitor::RemoveFromWaitSet(Thread *thread) { 2055f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(owner_ == Thread::Current()); 2065f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(thread != NULL); 2075f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (wait_set_ == NULL) { 2085f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 2095f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 2105f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (wait_set_ == thread) { 211dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers wait_set_ = thread->GetWaitNext(); 212dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers thread->SetWaitNext(nullptr); 2135f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 2145f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 2155f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 2165f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes Thread* t = wait_set_; 217dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers while (t->GetWaitNext() != NULL) { 218dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers if (t->GetWaitNext() == thread) { 219dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers t->SetWaitNext(thread->GetWaitNext()); 220dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers thread->SetWaitNext(nullptr); 2215f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 2225f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 223dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers t = t->GetWaitNext(); 2245f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 2255f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 2265f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 2276aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartiervoid Monitor::SetObject(mirror::Object* object) { 22894f7b49578b6aaa80de8ffed230648d601393905Hiroshi Yamauchi obj_ = GcRoot<mirror::Object>(object); 2296aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier} 2306aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier 2315f79133a435ebcb20000370d56046fe01201dd80Elliott Hughesvoid Monitor::Lock(Thread* self) { 232d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu(self, monitor_lock_); 233d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers while (true) { 234440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier if (owner_ == nullptr) { // Unowned. 235d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers owner_ = self; 236d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers CHECK_EQ(lock_count_, 0); 237d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // When debugging, save the current monitor holder for future 238d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // acquisition failures to use in sampled logging. 239d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (lock_profiling_threshold_ != 0) { 240d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers locking_method_ = self->GetCurrentMethod(&locking_dex_pc_); 241fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes } 242d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; 243d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else if (owner_ == self) { // Recursive. 244d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers lock_count_++; 245d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; 246fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes } 247d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Contended. 248d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers const bool log_contention = (lock_profiling_threshold_ != 0); 249d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint64_t wait_start_ms = log_contention ? 0 : MilliTime(); 250ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers mirror::ArtMethod* owners_method = locking_method_; 251d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t owners_dex_pc = locking_dex_pc_; 252440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier // Do this before releasing the lock so that we don't get deflated. 253440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier ++num_waiters_; 254d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_lock_.Unlock(self); // Let go of locks in order. 255a6e7f0872c42009ecbee82d7fbe452deef9ae65bMathieu Chartier self->SetMonitorEnterObject(GetObject()); 256d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers { 257d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers ScopedThreadStateChange tsc(self, kBlocked); // Change to blocked and give up mutator_lock_. 258d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu2(self, monitor_lock_); // Reacquire monitor_lock_ without mutator_lock_ for Wait. 259d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (owner_ != NULL) { // Did the owner_ give the lock up? 260d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_contenders_.Wait(self); // Still contended so wait. 261d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Woken from contention. 262d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (log_contention) { 263d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint64_t wait_ms = MilliTime() - wait_start_ms; 264d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t sample_percent; 265d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (wait_ms >= lock_profiling_threshold_) { 266d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers sample_percent = 100; 267d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 268d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers sample_percent = 100 * wait_ms / lock_profiling_threshold_; 269d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 270d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (sample_percent != 0 && (static_cast<uint32_t>(rand() % 100) < sample_percent)) { 271d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers const char* owners_filename; 272d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t owners_line_number; 273d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers TranslateLocation(owners_method, owners_dex_pc, &owners_filename, &owners_line_number); 274d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LogContentionEvent(self, wait_ms, sample_percent, owners_filename, owners_line_number); 275d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 276d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 277fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes } 2785f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 279a6e7f0872c42009ecbee82d7fbe452deef9ae65bMathieu Chartier self->SetMonitorEnterObject(nullptr); 280d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_lock_.Lock(self); // Reacquire locks in order. 281440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier --num_waiters_; 282fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes } 2835f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 2845f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 2856d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogersstatic void ThrowIllegalMonitorStateExceptionF(const char* fmt, ...) 2866d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers __attribute__((format(printf, 1, 2))); 2876d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers 28800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersstatic void ThrowIllegalMonitorStateExceptionF(const char* fmt, ...) 289b726dcb581bf72da46527378ccb6889020f0e6e9Ian Rogers SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2906d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers va_list args; 2916d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers va_start(args, fmt); 29262d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers Thread* self = Thread::Current(); 29362d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 29462d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers self->ThrowNewExceptionV(throw_location, "Ljava/lang/IllegalMonitorStateException;", fmt, args); 295d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (!Runtime::Current()->IsStarted() || VLOG_IS_ON(monitor)) { 29664277f38032208a0c1081ff9e466c04009b96383Brian Carlstrom std::ostringstream ss; 29762d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers self->Dump(ss); 298d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LOG(Runtime::Current()->IsStarted() ? INFO : ERROR) 299d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers << self->GetException(NULL)->Dump() << "\n" << ss.str(); 30064277f38032208a0c1081ff9e466c04009b96383Brian Carlstrom } 3016d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers va_end(args); 3026d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers} 3036d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers 304d423741f91526cada9d081c64ee295ec9863032dElliott Hughesstatic std::string ThreadToString(Thread* thread) { 305d423741f91526cada9d081c64ee295ec9863032dElliott Hughes if (thread == NULL) { 306d423741f91526cada9d081c64ee295ec9863032dElliott Hughes return "NULL"; 307d423741f91526cada9d081c64ee295ec9863032dElliott Hughes } 308d423741f91526cada9d081c64ee295ec9863032dElliott Hughes std::ostringstream oss; 309d423741f91526cada9d081c64ee295ec9863032dElliott Hughes // TODO: alternatively, we could just return the thread's name. 310d423741f91526cada9d081c64ee295ec9863032dElliott Hughes oss << *thread; 311d423741f91526cada9d081c64ee295ec9863032dElliott Hughes return oss.str(); 312d423741f91526cada9d081c64ee295ec9863032dElliott Hughes} 313d423741f91526cada9d081c64ee295ec9863032dElliott Hughes 3142dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogersvoid Monitor::FailedUnlock(mirror::Object* o, Thread* expected_owner, Thread* found_owner, 315ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes Monitor* monitor) { 316ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes Thread* current_owner = NULL; 317ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes std::string current_owner_string; 318ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes std::string expected_owner_string; 319ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes std::string found_owner_string; 320ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes { 321ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes // TODO: isn't this too late to prevent threads from disappearing? 322ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes // Acquire thread list lock so threads won't disappear from under us. 32350b35e2fd1a68cd1240e4a9d9f363e11764957d1Ian Rogers MutexLock mu(Thread::Current(), *Locks::thread_list_lock_); 324ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes // Re-read owner now that we hold lock. 325d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers current_owner = (monitor != NULL) ? monitor->GetOwner() : NULL; 326ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes // Get short descriptions of the threads involved. 327ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes current_owner_string = ThreadToString(current_owner); 328ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes expected_owner_string = ThreadToString(expected_owner); 329ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes found_owner_string = ThreadToString(found_owner); 330ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes } 3316d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers if (current_owner == NULL) { 3326d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers if (found_owner == NULL) { 3336d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("unlock of unowned monitor on object of type '%s'" 3346d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers " on thread '%s'", 335ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes PrettyTypeOf(o).c_str(), 336ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes expected_owner_string.c_str()); 3376d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } else { 3386d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers // Race: the original read found an owner but now there is none 3396d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("unlock of monitor owned by '%s' on object of type '%s'" 3406d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers " (where now the monitor appears unowned) on thread '%s'", 341ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes found_owner_string.c_str(), 342ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes PrettyTypeOf(o).c_str(), 343ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes expected_owner_string.c_str()); 3446d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } 3456d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } else { 3466d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers if (found_owner == NULL) { 3476d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers // Race: originally there was no owner, there is now 3486d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("unlock of monitor owned by '%s' on object of type '%s'" 3496d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers " (originally believed to be unowned) on thread '%s'", 350ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes current_owner_string.c_str(), 351ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes PrettyTypeOf(o).c_str(), 352ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes expected_owner_string.c_str()); 3536d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } else { 3546d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers if (found_owner != current_owner) { 3556d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers // Race: originally found and current owner have changed 3566d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("unlock of monitor originally owned by '%s' (now" 3576d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers " owned by '%s') on object of type '%s' on thread '%s'", 358ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes found_owner_string.c_str(), 359ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes current_owner_string.c_str(), 360ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes PrettyTypeOf(o).c_str(), 361ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes expected_owner_string.c_str()); 3626d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } else { 3636d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("unlock of monitor owned by '%s' on object of type '%s'" 3646d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers " on thread '%s", 365ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes current_owner_string.c_str(), 366ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes PrettyTypeOf(o).c_str(), 367ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes expected_owner_string.c_str()); 3686d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } 3696d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } 3706d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } 3715f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 3725f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 373d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogersbool Monitor::Unlock(Thread* self) { 3745f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(self != NULL); 375d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu(self, monitor_lock_); 3766d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers Thread* owner = owner_; 3776d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers if (owner == self) { 3785f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // We own the monitor, so nobody else can be in here. 3795f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (lock_count_ == 0) { 3805f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes owner_ = NULL; 38133dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao locking_method_ = NULL; 3820399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers locking_dex_pc_ = 0; 383d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Wake a contender. 384d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_contenders_.Signal(self); 3855f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } else { 3865f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes --lock_count_; 3875f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 3885f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } else { 3895f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // We don't own this, so we're not allowed to unlock it. 3905f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // The JNI spec says that we should throw IllegalMonitorStateException 3915f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // in this case. 3924cba0d979a11f955e6ec3c0f1bf61478af7aa810Hiroshi Yamauchi FailedUnlock(GetObject(), self, owner, this); 3935f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return false; 3945f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 3955f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return true; 3965f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 3975f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 3985f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes/* 3995f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Wait on a monitor until timeout, interrupt, or notification. Used for 4005f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Object.wait() and (somewhat indirectly) Thread.sleep() and Thread.join(). 4015f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 4025f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * If another thread calls Thread.interrupt(), we throw InterruptedException 4035f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * and return immediately if one of the following are true: 4045f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * - blocked in wait(), wait(long), or wait(long, int) methods of Object 4055f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * - blocked in join(), join(long), or join(long, int) methods of Thread 4065f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * - blocked in sleep(long), or sleep(long, int) methods of Thread 4075f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Otherwise, we set the "interrupted" flag. 4085f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 4095f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Checks to make sure that "ns" is in the range 0-999999 4105f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * (i.e. fractions of a millisecond) and throws the appropriate 4115f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * exception if it isn't. 4125f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 4135f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * The spec allows "spurious wakeups", and recommends that all code using 4145f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Object.wait() do so in a loop. This appears to derive from concerns 4155f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * about pthread_cond_wait() on multiprocessor systems. Some commentary 4165f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * on the web casts doubt on whether these can/should occur. 4175f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 4185f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Since we're allowed to wake up "early", we clamp extremely long durations 4195f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * to return at the end of the 32-bit time epoch. 4205f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 4214cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughesvoid Monitor::Wait(Thread* self, int64_t ms, int32_t ns, 4224cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes bool interruptShouldThrow, ThreadState why) { 4235f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(self != NULL); 4244cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes DCHECK(why == kTimedWaiting || why == kWaiting || why == kSleeping); 4255f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 426d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_lock_.Lock(self); 427d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers 4285f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Make sure that we hold the lock. 4295f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (owner_ != self) { 430d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_lock_.Unlock(self); 4311af6a1fa35ff7dc0a5c653f19dbc8a91c914aa42Elena Sayapina ThrowIllegalMonitorStateExceptionF("object not locked by thread before wait()"); 4325f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 4335f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 4344cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes 435df42c4815c30b9df15aacb88070c1e94f41d0226Elliott Hughes // We need to turn a zero-length timed wait into a regular wait because 436df42c4815c30b9df15aacb88070c1e94f41d0226Elliott Hughes // Object.wait(0, 0) is defined as Object.wait(0), which is defined as Object.wait(). 437df42c4815c30b9df15aacb88070c1e94f41d0226Elliott Hughes if (why == kTimedWaiting && (ms == 0 && ns == 0)) { 438df42c4815c30b9df15aacb88070c1e94f41d0226Elliott Hughes why = kWaiting; 439df42c4815c30b9df15aacb88070c1e94f41d0226Elliott Hughes } 440df42c4815c30b9df15aacb88070c1e94f41d0226Elliott Hughes 4415f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Enforce the timeout range. 4425f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (ms < 0 || ns < 0 || ns > 999999) { 4431af6a1fa35ff7dc0a5c653f19dbc8a91c914aa42Elena Sayapina monitor_lock_.Unlock(self); 44462d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 44562d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers self->ThrowNewExceptionF(throw_location, "Ljava/lang/IllegalArgumentException;", 446ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers "timeout arguments out of range: ms=%" PRId64 " ns=%d", ms, ns); 4475f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 4485f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 4495f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 4505f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes /* 4515f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Add ourselves to the set of threads waiting on this monitor, and 4525f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * release our hold. We need to let it go even if we're a few levels 4535f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * deep in a recursive lock, and we need to restore that later. 4545f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 4555f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * We append to the wait set ahead of clearing the count and owner 4565f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * fields so the subroutine can check that the calling thread owns 4575f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * the monitor. Aside from that, the order of member updates is 4585f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * not order sensitive as we hold the pthread mutex. 4595f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 4605f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes AppendToWaitSet(self); 461440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier ++num_waiters_; 4620399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers int prev_lock_count = lock_count_; 4635f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes lock_count_ = 0; 4645f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes owner_ = NULL; 465ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers mirror::ArtMethod* saved_method = locking_method_; 46633dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao locking_method_ = NULL; 4670399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers uintptr_t saved_dex_pc = locking_dex_pc_; 4680399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers locking_dex_pc_ = 0; 4695f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 4705f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes /* 4714cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes * Update thread state. If the GC wakes up, it'll ignore us, knowing 4725f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * that we won't touch any references in this state, and we'll check 4735f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * our suspend mode before we transition out. 4745f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 4754cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes self->TransitionFromRunnableToSuspended(why); 4765f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 477b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes bool was_interrupted = false; 47800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers { 47900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Pseudo-atomically wait on self's wait_cond_ and release the monitor lock. 480dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers MutexLock mu(self, *self->GetWaitMutex()); 4815f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 48200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Set wait_monitor_ to the monitor object we will be waiting on. When wait_monitor_ is 48300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // non-NULL a notifying or interrupting thread must signal the thread's wait_cond_ to wake it 48400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // up. 485dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers DCHECK(self->GetWaitMonitor() == nullptr); 486dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->SetWaitMonitor(this); 4875f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 48800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Release the monitor lock. 489d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_contenders_.Signal(self); 490d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_lock_.Unlock(self); 49100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 492b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes // Handle the case where the thread was interrupted before we called wait(). 493dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers if (self->IsInterruptedLocked()) { 494b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes was_interrupted = true; 49500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } else { 49600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Wait for a notification or a timeout to occur. 4974cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes if (why == kWaiting) { 498dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->GetWaitConditionVariable()->Wait(self); 49900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } else { 5004cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes DCHECK(why == kTimedWaiting || why == kSleeping) << why; 501dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->GetWaitConditionVariable()->TimedWait(self, ms, ns); 50200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 503dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers if (self->IsInterruptedLocked()) { 504b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes was_interrupted = true; 50500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 506dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->SetInterruptedLocked(false); 50700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 5085f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5095f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 51000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Set self->status back to kRunnable, and self-suspend if needed. 51100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers self->TransitionFromSuspendedToRunnable(); 5125f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 513b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes { 514b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes // We reset the thread's wait_monitor_ field after transitioning back to runnable so 515b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes // that a thread in a waiting/sleeping state has a non-null wait_monitor_ for debugging 516b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes // and diagnostic purposes. (If you reset this earlier, stack dumps will claim that threads 517b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes // are waiting on "null".) 518dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers MutexLock mu(self, *self->GetWaitMutex()); 519dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers DCHECK(self->GetWaitMonitor() != nullptr); 520dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->SetWaitMonitor(nullptr); 521b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes } 522b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes 523d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Re-acquire the monitor and lock. 52400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers Lock(self); 525d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_lock_.Lock(self); 526dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->GetWaitMutex()->AssertNotHeld(self); 5275f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 5285f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes /* 5295f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * We remove our thread from wait set after restoring the count 5305f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * and owner fields so the subroutine can check that the calling 5315f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * thread owns the monitor. Aside from that, the order of member 5325f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * updates is not order sensitive as we hold the pthread mutex. 5335f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 5345f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes owner_ = self; 5350399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers lock_count_ = prev_lock_count; 5360399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers locking_method_ = saved_method; 5370399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers locking_dex_pc_ = saved_dex_pc; 538440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier --num_waiters_; 5395f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes RemoveFromWaitSet(self); 5405f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 5411af6a1fa35ff7dc0a5c653f19dbc8a91c914aa42Elena Sayapina monitor_lock_.Unlock(self); 5421af6a1fa35ff7dc0a5c653f19dbc8a91c914aa42Elena Sayapina 543b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes if (was_interrupted) { 5445f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes /* 5455f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * We were interrupted while waiting, or somebody interrupted an 5465f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * un-interruptible thread earlier and we're bailing out immediately. 5475f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 5485f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * The doc sayeth: "The interrupted status of the current thread is 5495f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * cleared when this exception is thrown." 5505f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 55100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers { 552dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers MutexLock mu(self, *self->GetWaitMutex()); 553dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->SetInterruptedLocked(false); 55400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 5555f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (interruptShouldThrow) { 55662d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 55762d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers self->ThrowNewException(throw_location, "Ljava/lang/InterruptedException;", NULL); 5585f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5595f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5605f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 5615f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 5625f79133a435ebcb20000370d56046fe01201dd80Elliott Hughesvoid Monitor::Notify(Thread* self) { 5635f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(self != NULL); 564d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu(self, monitor_lock_); 5655f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Make sure that we hold the lock. 5665f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (owner_ != self) { 5676d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("object not locked by thread before notify()"); 5685f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 5695f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5705f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Signal the first waiting thread in the wait set. 5715f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes while (wait_set_ != NULL) { 5725f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes Thread* thread = wait_set_; 573dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers wait_set_ = thread->GetWaitNext(); 574dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers thread->SetWaitNext(nullptr); 5755f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 5765f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Check to see if the thread is still waiting. 577dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers MutexLock mu(self, *thread->GetWaitMutex()); 578dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers if (thread->GetWaitMonitor() != nullptr) { 579dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers thread->GetWaitConditionVariable()->Signal(self); 5805f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 5815f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5825f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5835f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 5845f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 5855f79133a435ebcb20000370d56046fe01201dd80Elliott Hughesvoid Monitor::NotifyAll(Thread* self) { 5865f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(self != NULL); 587d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu(self, monitor_lock_); 5885f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Make sure that we hold the lock. 5895f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (owner_ != self) { 5906d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("object not locked by thread before notifyAll()"); 5915f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 5925f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5935f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Signal all threads in the wait set. 5945f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes while (wait_set_ != NULL) { 5955f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes Thread* thread = wait_set_; 596dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers wait_set_ = thread->GetWaitNext(); 597dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers thread->SetWaitNext(nullptr); 5985f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes thread->Notify(); 5995f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 6005f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 6015f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 602590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartierbool Monitor::Deflate(Thread* self, mirror::Object* obj) { 603590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier DCHECK(obj != nullptr); 6044d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier // Don't need volatile since we only deflate with mutators suspended. 6054d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier LockWord lw(obj->GetLockWord(false)); 606590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // If the lock isn't an inflated monitor, then we don't need to deflate anything. 607590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (lw.GetState() == LockWord::kFatLocked) { 608590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier Monitor* monitor = lw.FatLockMonitor(); 609440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier DCHECK(monitor != nullptr); 610590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier MutexLock mu(self, monitor->monitor_lock_); 611440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier // Can't deflate if we have anybody waiting on the CV. 612440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier if (monitor->num_waiters_ > 0) { 613440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier return false; 614440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier } 615590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier Thread* owner = monitor->owner_; 616590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (owner != nullptr) { 617590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Can't deflate if we are locked and have a hash code. 618590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (monitor->HasHashCode()) { 619590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier return false; 620590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 621590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Can't deflate if our lock count is too high. 622590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (monitor->lock_count_ > LockWord::kThinLockMaxCount) { 623590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier return false; 624590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 625590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Deflate to a thin lock. 6264d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier obj->SetLockWord(LockWord::FromThinLockId(owner->GetThreadId(), monitor->lock_count_), false); 6274d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier VLOG(monitor) << "Deflated " << obj << " to thin lock " << owner->GetTid() << " / " 6284d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier << monitor->lock_count_; 629590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } else if (monitor->HasHashCode()) { 6304d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier obj->SetLockWord(LockWord::FromHashCode(monitor->GetHashCode()), false); 631440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier VLOG(monitor) << "Deflated " << obj << " to hash monitor " << monitor->GetHashCode(); 632590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } else { 633590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // No lock and no hash, just put an empty lock word inside the object. 6344d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier obj->SetLockWord(LockWord(), false); 635440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier VLOG(monitor) << "Deflated" << obj << " to empty lock word"; 636590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 637590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // The monitor is deflated, mark the object as nullptr so that we know to delete it during the 638590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // next GC. 63994f7b49578b6aaa80de8ffed230648d601393905Hiroshi Yamauchi monitor->obj_ = GcRoot<mirror::Object>(nullptr); 640590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 641590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier return true; 642590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier} 643590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier 6445f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes/* 645d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * Changes the shape of a monitor from thin to fat, preserving the internal lock state. The calling 646d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * thread must own the lock or the owner must be suspended. There's a race with other threads 647d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers * inflating the lock and so the caller should read the monitor following the call. 6485f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 649ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartiervoid Monitor::Inflate(Thread* self, Thread* owner, mirror::Object* obj, int32_t hash_code) { 65074240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe DCHECK(self != nullptr); 65174240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe DCHECK(obj != nullptr); 6525f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Allocate and acquire a new monitor. 65374240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe Monitor* m = MonitorPool::CreateMonitor(self, owner, obj, hash_code); 65474240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe DCHECK(m != nullptr); 655d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (m->Install(self)) { 65686ab7912423f63541073af5c487b509e9b2b5420Haifeng Li if (owner != nullptr) { 65786ab7912423f63541073af5c487b509e9b2b5420Haifeng Li VLOG(monitor) << "monitor: thread" << owner->GetThreadId() 65874240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe << " created monitor " << m << " for object " << obj; 65986ab7912423f63541073af5c487b509e9b2b5420Haifeng Li } else { 66086ab7912423f63541073af5c487b509e9b2b5420Haifeng Li VLOG(monitor) << "monitor: Inflate with hashcode " << hash_code 66174240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe << " created monitor " << m << " for object " << obj; 66286ab7912423f63541073af5c487b509e9b2b5420Haifeng Li } 66374240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe Runtime::Current()->GetMonitorList()->Add(m); 6644d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier CHECK_EQ(obj->GetLockWord(true).GetState(), LockWord::kFatLocked); 66574240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe } else { 66674240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe MonitorPool::ReleaseMonitor(self, m); 667ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier } 668ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier} 669ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier 6700cd81352a7c06e381951cea1b104fd73516f4341Mathieu Chartiervoid Monitor::InflateThinLocked(Thread* self, Handle<mirror::Object> obj, LockWord lock_word, 671ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier uint32_t hash_code) { 672ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier DCHECK_EQ(lock_word.GetState(), LockWord::kThinLocked); 673ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier uint32_t owner_thread_id = lock_word.ThinLockOwner(); 674ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier if (owner_thread_id == self->GetThreadId()) { 675ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // We own the monitor, we can easily inflate it. 676eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier Inflate(self, self, obj.Get(), hash_code); 677ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier } else { 678ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier ThreadList* thread_list = Runtime::Current()->GetThreadList(); 679ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // Suspend the owner, inflate. First change to blocked and give up mutator_lock_. 680eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier self->SetMonitorEnterObject(obj.Get()); 681a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier bool timed_out; 682a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier Thread* owner; 683a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier { 684a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier ScopedThreadStateChange tsc(self, kBlocked); 685f3d874c60ee3ada19ce26a5c4e532312b6f3a9e9Ian Rogers // Take suspend thread lock to avoid races with threads trying to suspend this one. 686f3d874c60ee3ada19ce26a5c4e532312b6f3a9e9Ian Rogers MutexLock mu(self, *Locks::thread_list_suspend_thread_lock_); 687a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier owner = thread_list->SuspendThreadByThreadId(owner_thread_id, false, &timed_out); 688a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier } 689a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier if (owner != nullptr) { 690a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier // We succeeded in suspending the thread, check the lock's status didn't change. 691a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier lock_word = obj->GetLockWord(true); 692a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier if (lock_word.GetState() == LockWord::kThinLocked && 693a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier lock_word.ThinLockOwner() == owner_thread_id) { 694a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier // Go ahead and inflate the lock. 695a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier Inflate(self, owner, obj.Get(), hash_code); 696ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier } 697a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier thread_list->Resume(owner, false); 698ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier } 699dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->SetMonitorEnterObject(nullptr); 700d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 7015f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 7025f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 703719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers// Fool annotalysis into thinking that the lock on obj is acquired. 704719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogersstatic mirror::Object* FakeLock(mirror::Object* obj) 705719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers EXCLUSIVE_LOCK_FUNCTION(obj) NO_THREAD_SAFETY_ANALYSIS { 706719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers return obj; 707719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers} 708719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 709719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers// Fool annotalysis into thinking that the lock on obj is release. 710719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogersstatic mirror::Object* FakeUnlock(mirror::Object* obj) 711719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers UNLOCK_FUNCTION(obj) NO_THREAD_SAFETY_ANALYSIS { 712719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers return obj; 713719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers} 714719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 715e7e8a5fea2d852cccc840fa046151a16627f26cdMathieu Chartiermirror::Object* Monitor::MonitorEnter(Thread* self, mirror::Object* obj) { 7164681c809ba35d50fab92c592ce8d2c7f8b2731f7Elliott Hughes DCHECK(self != NULL); 7174681c809ba35d50fab92c592ce8d2c7f8b2731f7Elliott Hughes DCHECK(obj != NULL); 718719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers obj = FakeLock(obj); 719d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t thread_id = self->GetThreadId(); 720d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers size_t contention_count = 0; 721eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier StackHandleScope<1> hs(self); 722eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier Handle<mirror::Object> h_obj(hs.NewHandle(obj)); 723d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers while (true) { 724eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier LockWord lock_word = h_obj->GetLockWord(true); 725d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers switch (lock_word.GetState()) { 726d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kUnlocked: { 727d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LockWord thin_locked(LockWord::FromThinLockId(thread_id, 0)); 728228602f562f1d130d06e60a98752d99c2d467d6aIan Rogers if (h_obj->CasLockWordWeakSequentiallyConsistent(lock_word, thin_locked)) { 7293035961cb41865b80b927546be0c708b6389cec6Hans Boehm // CasLockWord enforces more than the acquire ordering we need here. 730eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier return h_obj.Get(); // Success! 731d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 732d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers continue; // Go again. 7335f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 734d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kThinLocked: { 735d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t owner_thread_id = lock_word.ThinLockOwner(); 736d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (owner_thread_id == thread_id) { 737d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // We own the lock, increase the recursion count. 738d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t new_count = lock_word.ThinLockCount() + 1; 739d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (LIKELY(new_count <= LockWord::kThinLockMaxCount)) { 740d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LockWord thin_locked(LockWord::FromThinLockId(thread_id, new_count)); 741eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier h_obj->SetLockWord(thin_locked, true); 742eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier return h_obj.Get(); // Success! 743d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 744d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // We'd overflow the recursion count, so inflate the monitor. 745eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier InflateThinLocked(self, h_obj, lock_word, 0); 746d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 747d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 748d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Contention. 749d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers contention_count++; 750ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier Runtime* runtime = Runtime::Current(); 751ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier if (contention_count <= runtime->GetMaxSpinsBeforeThinkLockInflation()) { 752b363f666883860d40823d5528df3c98c897f74f4Mathieu Chartier // TODO: Consider switching the thread state to kBlocked when we are yielding. 753251755cd511463260e60be98bf138b6aa1c14bf3Mathieu Chartier // Use sched_yield instead of NanoSleep since NanoSleep can wait much longer than the 754251755cd511463260e60be98bf138b6aa1c14bf3Mathieu Chartier // parameter you pass in. This can cause thread suspension to take excessively long 755b363f666883860d40823d5528df3c98c897f74f4Mathieu Chartier // and make long pauses. See b/16307460. 756251755cd511463260e60be98bf138b6aa1c14bf3Mathieu Chartier sched_yield(); 7575f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } else { 758d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers contention_count = 0; 759eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier InflateThinLocked(self, h_obj, lock_word, 0); 7605f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 7615f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 762d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers continue; // Start from the beginning. 763d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 764d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kFatLocked: { 765d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 766d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers mon->Lock(self); 767eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier return h_obj.Get(); // Success! 7685f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 769719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers case LockWord::kHashCode: 770ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // Inflate with the existing hashcode. 771eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier Inflate(self, nullptr, h_obj.Get(), lock_word.GetHashCode()); 772719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers continue; // Start from the beginning. 773590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier default: { 774590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier LOG(FATAL) << "Invalid monitor state " << lock_word.GetState(); 775eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier return h_obj.Get(); 776590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 7775f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 7785f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 7795f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 7805f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 7812dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogersbool Monitor::MonitorExit(Thread* self, mirror::Object* obj) { 7825f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(self != NULL); 7835f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(obj != NULL); 784719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers obj = FakeUnlock(obj); 7854d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier LockWord lock_word = obj->GetLockWord(true); 786eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier StackHandleScope<1> hs(self); 787eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier Handle<mirror::Object> h_obj(hs.NewHandle(obj)); 788d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers switch (lock_word.GetState()) { 789ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kHashCode: 790ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // Fall-through. 791d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kUnlocked: 792eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier FailedUnlock(h_obj.Get(), self, nullptr, nullptr); 793d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return false; // Failure. 794d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kThinLocked: { 795d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t thread_id = self->GetThreadId(); 796d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t owner_thread_id = lock_word.ThinLockOwner(); 797d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (owner_thread_id != thread_id) { 798d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // TODO: there's a race here with the owner dying while we unlock. 799d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Thread* owner = 800d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Runtime::Current()->GetThreadList()->FindThreadByThreadId(lock_word.ThinLockOwner()); 801eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier FailedUnlock(h_obj.Get(), self, owner, nullptr); 802d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return false; // Failure. 8035f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } else { 804d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // We own the lock, decrease the recursion count. 805d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (lock_word.ThinLockCount() != 0) { 806d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t new_count = lock_word.ThinLockCount() - 1; 807d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LockWord thin_locked(LockWord::FromThinLockId(thread_id, new_count)); 808eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier h_obj->SetLockWord(thin_locked, true); 809d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 810eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier h_obj->SetLockWord(LockWord(), true); 811d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 812d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return true; // Success! 8135f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 8145f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 815d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kFatLocked: { 816d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 817d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return mon->Unlock(self); 8185f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 819590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier default: { 820590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier LOG(FATAL) << "Invalid monitor state " << lock_word.GetState(); 821d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return false; 822590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 8235f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 8245f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 8255f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 8265f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes/* 8275f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Object.wait(). Also called for class init. 8285f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 8292dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogersvoid Monitor::Wait(Thread* self, mirror::Object *obj, int64_t ms, int32_t ns, 8304cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes bool interruptShouldThrow, ThreadState why) { 8314d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK(self != nullptr); 8324d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK(obj != nullptr); 8334d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier LockWord lock_word = obj->GetLockWord(true); 834d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers switch (lock_word.GetState()) { 835ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kHashCode: 836ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // Fall-through. 837d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kUnlocked: 8386d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("object not locked by thread before wait()"); 839d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; // Failure. 840d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kThinLocked: { 841d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t thread_id = self->GetThreadId(); 842d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t owner_thread_id = lock_word.ThinLockOwner(); 843d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (owner_thread_id != thread_id) { 844d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers ThrowIllegalMonitorStateExceptionF("object not locked by thread before wait()"); 845d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; // Failure. 846d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 847d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // We own the lock, inflate to enqueue ourself on the Monitor. 8484e6a31eb97f22f4480827474b30b9e64f396eaceMathieu Chartier Inflate(self, self, obj, 0); 8494d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier lock_word = obj->GetLockWord(true); 850d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 851d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers break; 8525f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 853d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kFatLocked: 854d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers break; // Already set for a wait. 855590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier default: { 856590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier LOG(FATAL) << "Invalid monitor state " << lock_word.GetState(); 857590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier return; 858590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 8595f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 860d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 861d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers mon->Wait(self, ms, ns, interruptShouldThrow, why); 8625f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 8635f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 86413c479e7e9b62115fe0409e5273c1e976a1c09f9Ian Rogersvoid Monitor::DoNotify(Thread* self, mirror::Object* obj, bool notify_all) { 8654d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK(self != nullptr); 8664d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK(obj != nullptr); 8674d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier LockWord lock_word = obj->GetLockWord(true); 868d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers switch (lock_word.GetState()) { 869ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kHashCode: 870ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // Fall-through. 871d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kUnlocked: 8726d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("object not locked by thread before notify()"); 873d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; // Failure. 874d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kThinLocked: { 875d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t thread_id = self->GetThreadId(); 876d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t owner_thread_id = lock_word.ThinLockOwner(); 877d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (owner_thread_id != thread_id) { 878d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers ThrowIllegalMonitorStateExceptionF("object not locked by thread before notify()"); 879d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; // Failure. 880d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 881d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // We own the lock but there's no Monitor and therefore no waiters. 882d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; // Success. 883d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 884d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 885d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kFatLocked: { 886d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 887d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (notify_all) { 888d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers mon->NotifyAll(self); 889d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 890d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers mon->Notify(self); 891d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 892d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; // Success. 8935f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 894590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier default: { 895590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier LOG(FATAL) << "Invalid monitor state " << lock_word.GetState(); 896590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier return; 897590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 8985f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 8995f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 9005f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 901d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogersuint32_t Monitor::GetLockOwnerThreadId(mirror::Object* obj) { 9024d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK(obj != nullptr); 9034d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier LockWord lock_word = obj->GetLockWord(true); 904d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers switch (lock_word.GetState()) { 905ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kHashCode: 906ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // Fall-through. 907d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kUnlocked: 908d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return ThreadList::kInvalidThreadId; 909d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kThinLocked: 910d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return lock_word.ThinLockOwner(); 911d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kFatLocked: { 912d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 913d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return mon->GetOwnerThreadId(); 9145f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 915590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier default: { 916d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LOG(FATAL) << "Unreachable"; 917d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return ThreadList::kInvalidThreadId; 918590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 9195f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 9205f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 9215f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 9228e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughesvoid Monitor::DescribeWait(std::ostream& os, const Thread* thread) { 923d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers // Determine the wait message and object we're waiting or blocked upon. 924d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers mirror::Object* pretty_object = nullptr; 925d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers const char* wait_message = nullptr; 926d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t lock_owner = ThreadList::kInvalidThreadId; 927d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers ThreadState state = thread->GetState(); 928b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes if (state == kWaiting || state == kTimedWaiting || state == kSleeping) { 929d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers wait_message = (state == kSleeping) ? " - sleeping on " : " - waiting on "; 930d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers Thread* self = Thread::Current(); 931d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers MutexLock mu(self, *thread->GetWaitMutex()); 932d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers Monitor* monitor = thread->GetWaitMonitor(); 933d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers if (monitor != nullptr) { 9344cba0d979a11f955e6ec3c0f1bf61478af7aa810Hiroshi Yamauchi pretty_object = monitor->GetObject(); 9358e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes } 93634e069606d6f1698cd3c33b39e72b79ae27e1c7bElliott Hughes } else if (state == kBlocked) { 937d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers wait_message = " - waiting to lock "; 938d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers pretty_object = thread->GetMonitorEnterObject(); 939d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers if (pretty_object != nullptr) { 940d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers lock_owner = pretty_object->GetLockOwnerThreadId(); 9418e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes } 9428e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes } 9438e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes 944d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers if (wait_message != nullptr) { 945d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers if (pretty_object == nullptr) { 946d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers os << wait_message << "an unknown object"; 947d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers } else { 9484d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier if ((pretty_object->GetLockWord(true).GetState() == LockWord::kThinLocked) && 949d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 950d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers // Getting the identity hashcode here would result in lock inflation and suspension of the 951d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers // current thread, which isn't safe if this is the only runnable thread. 952d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers os << wait_message << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", 953d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers reinterpret_cast<intptr_t>(pretty_object), 954d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers PrettyTypeOf(pretty_object).c_str()); 955d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers } else { 956d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers // - waiting on <0x6008c468> (a java.lang.Class<java.lang.ref.ReferenceQueue>) 957d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers os << wait_message << StringPrintf("<0x%08x> (a %s)", pretty_object->IdentityHashCode(), 958d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers PrettyTypeOf(pretty_object).c_str()); 959d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers } 960d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers } 961d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers // - waiting to lock <0x613f83d8> (a java.lang.Object) held by thread 5 962d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers if (lock_owner != ThreadList::kInvalidThreadId) { 963d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers os << " held by thread " << lock_owner; 964d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers } 965d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers os << "\n"; 9668e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes } 9678e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes} 9688e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes 9692dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogersmirror::Object* Monitor::GetContendedMonitor(Thread* thread) { 970f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes // This is used to implement JDWP's ThreadReference.CurrentContendedMonitor, and has a bizarre 971f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes // definition of contended that includes a monitor a thread is trying to enter... 972dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers mirror::Object* result = thread->GetMonitorEnterObject(); 973d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (result == NULL) { 974d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // ...but also a monitor that the thread is waiting on. 975dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers MutexLock mu(Thread::Current(), *thread->GetWaitMutex()); 976dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers Monitor* monitor = thread->GetWaitMonitor(); 977f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes if (monitor != NULL) { 978d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers result = monitor->GetObject(); 979f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes } 980f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes } 981d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return result; 982f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes} 983f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes 9842dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogersvoid Monitor::VisitLocks(StackVisitor* stack_visitor, void (*callback)(mirror::Object*, void*), 985956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe void* callback_context, bool abort_on_failure) { 986ea46f950e7a51585db293cd7f047de190a482414Brian Carlstrom mirror::ArtMethod* m = stack_visitor->GetMethod(); 98708fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes CHECK(m != NULL); 98808fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 98908fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes // Native methods are an easy special case. 99008fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes // TODO: use the JNI implementation's table of explicit MonitorEnter calls and dump those too. 99108fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes if (m->IsNative()) { 99208fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes if (m->IsSynchronized()) { 993eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier mirror::Object* jni_this = stack_visitor->GetCurrentHandleScope()->GetReference(0); 9944993bbc8eda377804e585efd918f8ab9d9eab7d4Elliott Hughes callback(jni_this, callback_context); 99508fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes } 99608fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes return; 99708fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes } 99808fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 99961f916cc4757610ce308bfdea9a00cf29afd2b02jeffhao // Proxy methods should not be synchronized. 100061f916cc4757610ce308bfdea9a00cf29afd2b02jeffhao if (m->IsProxyMethod()) { 100161f916cc4757610ce308bfdea9a00cf29afd2b02jeffhao CHECK(!m->IsSynchronized()); 100261f916cc4757610ce308bfdea9a00cf29afd2b02jeffhao return; 100361f916cc4757610ce308bfdea9a00cf29afd2b02jeffhao } 100461f916cc4757610ce308bfdea9a00cf29afd2b02jeffhao 100508fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes // <clinit> is another special case. The runtime holds the class lock while calling <clinit>. 1006bfd9a4378eacaf2dc2bbe05ad48c5164fc93c9feMathieu Chartier if (m->IsClassInitializer()) { 10074993bbc8eda377804e585efd918f8ab9d9eab7d4Elliott Hughes callback(m->GetDeclaringClass(), callback_context); 100808fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes // Fall through because there might be synchronization in the user code too. 100908fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes } 101008fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 101108fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes // Is there any reason to believe there's any synchronization in this method? 1012bfd9a4378eacaf2dc2bbe05ad48c5164fc93c9feMathieu Chartier const DexFile::CodeItem* code_item = m->GetCodeItem(); 1013caf7654a0e6c76c7489970b1a246fccf220f9982Elliott Hughes CHECK(code_item != NULL) << PrettyMethod(m); 101408fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes if (code_item->tries_size_ == 0) { 10157934ac288acfb2552bb0b06ec1f61e5820d924a4Brian Carlstrom return; // No "tries" implies no synchronization, so no held locks to report. 101608fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes } 101708fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 1018956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe // Get the dex pc. If abort_on_failure is false, GetDexPc will not abort in the case it cannot 1019956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe // find the dex pc, and instead return kDexNoIndex. Then bail out, as it indicates we have an 1020956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe // inconsistent stack anyways. 1021956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe uint32_t dex_pc = stack_visitor->GetDexPc(abort_on_failure); 1022956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe if (!abort_on_failure && dex_pc == DexFile::kDexNoIndex) { 1023956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe LOG(ERROR) << "Could not find dex_pc for " << PrettyMethod(m); 1024956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe return; 1025956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe } 1026956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe 102780537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes // Ask the verifier for the dex pcs of all the monitor-enter instructions corresponding to 102880537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes // the locks held in this stack frame. 102980537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes std::vector<uint32_t> monitor_enter_dex_pcs; 1030956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe verifier::MethodVerifier::FindLocksAtDexPc(m, dex_pc, &monitor_enter_dex_pcs); 103180537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes if (monitor_enter_dex_pcs.empty()) { 103280537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes return; 103380537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes } 103408fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 103580537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes for (size_t i = 0; i < monitor_enter_dex_pcs.size(); ++i) { 103680537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes // The verifier works in terms of the dex pcs of the monitor-enter instructions. 103780537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes // We want the registers used by those instructions (so we can read the values out of them). 103880537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes uint32_t dex_pc = monitor_enter_dex_pcs[i]; 103980537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes uint16_t monitor_enter_instruction = code_item->insns_[dex_pc]; 104008fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 104180537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes // Quick sanity check. 104280537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes if ((monitor_enter_instruction & 0xff) != Instruction::MONITOR_ENTER) { 104380537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes LOG(FATAL) << "expected monitor-enter @" << dex_pc << "; was " 104480537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes << reinterpret_cast<void*>(monitor_enter_instruction); 104508fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes } 104680537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes 104780537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes uint16_t monitor_register = ((monitor_enter_instruction >> 8) & 0xff); 10482dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers mirror::Object* o = reinterpret_cast<mirror::Object*>(stack_visitor->GetVReg(m, monitor_register, 10492dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers kReferenceVReg)); 10504993bbc8eda377804e585efd918f8ab9d9eab7d4Elliott Hughes callback(o, callback_context); 105108fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes } 105208fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes} 105308fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 1054d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogersbool Monitor::IsValidLockWord(LockWord lock_word) { 1055d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers switch (lock_word.GetState()) { 1056d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kUnlocked: 1057d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Nothing to check. 1058d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return true; 1059d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kThinLocked: 1060d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Basic sanity check of owner. 1061d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return lock_word.ThinLockOwner() != ThreadList::kInvalidThreadId; 1062d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kFatLocked: { 1063d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Check the monitor appears in the monitor list. 1064d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 1065d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MonitorList* list = Runtime::Current()->GetMonitorList(); 1066d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu(Thread::Current(), list->monitor_list_lock_); 1067d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers for (Monitor* list_mon : list->list_) { 1068d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (mon == list_mon) { 1069d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return true; // Found our monitor. 1070d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 10717dfb28c066159e6cde8181720f0c451a700ef966Ian Rogers } 1072d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return false; // Fail - unowned monitor in an object. 10737dfb28c066159e6cde8181720f0c451a700ef966Ian Rogers } 1074ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kHashCode: 1075ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier return true; 1076d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers default: 1077d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LOG(FATAL) << "Unreachable"; 1078d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return false; 10797dfb28c066159e6cde8181720f0c451a700ef966Ian Rogers } 10807dfb28c066159e6cde8181720f0c451a700ef966Ian Rogers} 10817dfb28c066159e6cde8181720f0c451a700ef966Ian Rogers 1082ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartierbool Monitor::IsLocked() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1083ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier MutexLock mu(Thread::Current(), monitor_lock_); 1084ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier return owner_ != nullptr; 1085ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier} 1086ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier 1087ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogersvoid Monitor::TranslateLocation(mirror::ArtMethod* method, uint32_t dex_pc, 1088d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers const char** source_file, uint32_t* line_number) const { 108933dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao // If method is null, location is unknown 109033dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao if (method == NULL) { 1091d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers *source_file = ""; 1092d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers *line_number = 0; 109333dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao return; 109433dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao } 1095bfd9a4378eacaf2dc2bbe05ad48c5164fc93c9feMathieu Chartier *source_file = method->GetDeclaringClassSourceFile(); 1096d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (*source_file == NULL) { 1097d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers *source_file = ""; 1098d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 1099bfd9a4378eacaf2dc2bbe05ad48c5164fc93c9feMathieu Chartier *line_number = method->GetLineNumFromDexPC(dex_pc); 1100d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers} 1101d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers 1102d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogersuint32_t Monitor::GetOwnerThreadId() { 1103d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu(Thread::Current(), monitor_lock_); 1104d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Thread* owner = owner_; 1105d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (owner != NULL) { 1106d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return owner->GetThreadId(); 1107d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 1108d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return ThreadList::kInvalidThreadId; 110912c51e3e5a8b5655351539618f1cf2331f52d1abElliott Hughes } 111033dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao} 111133dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao 1112c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu ChartierMonitorList::MonitorList() 1113440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier : allow_new_monitors_(true), monitor_list_lock_("MonitorList lock", kMonitorListLock), 1114c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier monitor_add_condition_("MonitorList disallow condition", monitor_list_lock_) { 1115c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes} 1116c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes 1117c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott HughesMonitorList::~MonitorList() { 111874240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe Thread* self = Thread::Current(); 111974240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe MutexLock mu(self, monitor_list_lock_); 112074240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe // Release all monitors to the pool. 112174240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe // TODO: Is it an invariant that *all* open monitors are in the list? Then we could 112274240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe // clear faster in the pool. 112374240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe MonitorPool::ReleaseMonitors(self, &list_); 1124c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes} 1125c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes 1126c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartiervoid MonitorList::DisallowNewMonitors() { 112750b35e2fd1a68cd1240e4a9d9f363e11764957d1Ian Rogers MutexLock mu(Thread::Current(), monitor_list_lock_); 1128c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier allow_new_monitors_ = false; 1129c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier} 1130c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier 1131c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartiervoid MonitorList::AllowNewMonitors() { 1132c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier Thread* self = Thread::Current(); 1133c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier MutexLock mu(self, monitor_list_lock_); 1134c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier allow_new_monitors_ = true; 1135c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier monitor_add_condition_.Broadcast(self); 1136c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier} 1137c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier 1138c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartiervoid MonitorList::Add(Monitor* m) { 1139c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier Thread* self = Thread::Current(); 1140c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier MutexLock mu(self, monitor_list_lock_); 1141c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier while (UNLIKELY(!allow_new_monitors_)) { 1142c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier monitor_add_condition_.WaitHoldingLocks(self); 1143c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier } 1144c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes list_.push_front(m); 1145c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes} 1146c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes 114783c8ee000d525017ead8753fce6bc1020249b96aMathieu Chartiervoid MonitorList::SweepMonitorList(IsMarkedCallback* callback, void* arg) { 114874240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe Thread* self = Thread::Current(); 114974240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe MutexLock mu(self, monitor_list_lock_); 115002e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (auto it = list_.begin(); it != list_.end(); ) { 1151c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes Monitor* m = *it; 11524cba0d979a11f955e6ec3c0f1bf61478af7aa810Hiroshi Yamauchi // Disable the read barrier in GetObject() as this is called by GC. 11534cba0d979a11f955e6ec3c0f1bf61478af7aa810Hiroshi Yamauchi mirror::Object* obj = m->GetObject<kWithoutReadBarrier>(); 1154590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // The object of a monitor can be null if we have deflated it. 115583c8ee000d525017ead8753fce6bc1020249b96aMathieu Chartier mirror::Object* new_obj = obj != nullptr ? callback(obj, arg) : nullptr; 11566aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier if (new_obj == nullptr) { 11576aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier VLOG(monitor) << "freeing monitor " << m << " belonging to unmarked object " 11584cba0d979a11f955e6ec3c0f1bf61478af7aa810Hiroshi Yamauchi << obj; 115974240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe MonitorPool::ReleaseMonitor(self, m); 1160c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes it = list_.erase(it); 1161c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes } else { 11626aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier m->SetObject(new_obj); 1163c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes ++it; 1164c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes } 1165c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes } 1166c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes} 1167c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes 116848ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartierstruct MonitorDeflateArgs { 116948ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier MonitorDeflateArgs() : self(Thread::Current()), deflate_count(0) {} 117048ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier Thread* const self; 117148ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier size_t deflate_count; 117248ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier}; 117348ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier 1174440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartierstatic mirror::Object* MonitorDeflateCallback(mirror::Object* object, void* arg) 1175440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 117648ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier MonitorDeflateArgs* args = reinterpret_cast<MonitorDeflateArgs*>(arg); 117748ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier if (Monitor::Deflate(args->self, object)) { 11784d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK_NE(object->GetLockWord(true).GetState(), LockWord::kFatLocked); 117948ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier ++args->deflate_count; 1180440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier // If we deflated, return nullptr so that the monitor gets removed from the array. 1181440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier return nullptr; 1182440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier } 1183440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier return object; // Monitor was not deflated. 1184440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier} 1185440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier 118648ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartiersize_t MonitorList::DeflateMonitors() { 118748ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier MonitorDeflateArgs args; 118848ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(args.self); 118948ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier SweepMonitorList(MonitorDeflateCallback, &args); 119048ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier return args.deflate_count; 1191440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier} 1192440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier 1193d9c4fc94fa618617f94e1de9af5f034549100753Ian RogersMonitorInfo::MonitorInfo(mirror::Object* obj) : owner_(NULL), entry_count_(0) { 11944d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK(obj != nullptr); 11954d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier LockWord lock_word = obj->GetLockWord(true); 1196d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers switch (lock_word.GetState()) { 1197d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kUnlocked: 1198ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // Fall-through. 1199590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier case LockWord::kForwardingAddress: 1200590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Fall-through. 1201ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kHashCode: 1202d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers break; 1203d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kThinLocked: 1204d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers owner_ = Runtime::Current()->GetThreadList()->FindThreadByThreadId(lock_word.ThinLockOwner()); 1205d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers entry_count_ = 1 + lock_word.ThinLockCount(); 1206d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Thin locks have no waiters. 1207d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers break; 1208d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kFatLocked: { 1209d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 1210d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers owner_ = mon->owner_; 1211d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers entry_count_ = 1 + mon->lock_count_; 1212dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers for (Thread* waiter = mon->wait_set_; waiter != NULL; waiter = waiter->GetWaitNext()) { 1213d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers waiters_.push_back(waiter); 1214d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 1215d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers break; 1216f327e07b37e349b1ec5eaad6dc294a9b7a081d20Elliott Hughes } 1217f327e07b37e349b1ec5eaad6dc294a9b7a081d20Elliott Hughes } 1218f327e07b37e349b1ec5eaad6dc294a9b7a081d20Elliott Hughes} 1219f327e07b37e349b1ec5eaad6dc294a9b7a081d20Elliott Hughes 12205f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} // namespace art 1221