monitor.cc revision 277ccbd200ea43590dfc06a93ae184a765327ad0
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 Hughesvoid Monitor::AppendToWaitSet(Thread* thread) { 1805f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(owner_ == Thread::Current()); 1815f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(thread != NULL); 182dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers DCHECK(thread->GetWaitNext() == nullptr) << thread->GetWaitNext(); 1835f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (wait_set_ == NULL) { 1845f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes wait_set_ = thread; 1855f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 1865f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 1875f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 1885f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // push_back. 1895f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes Thread* t = wait_set_; 190dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers while (t->GetWaitNext() != nullptr) { 191dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers t = t->GetWaitNext(); 1925f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 193dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers t->SetWaitNext(thread); 1945f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 1955f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 1965f79133a435ebcb20000370d56046fe01201dd80Elliott Hughesvoid Monitor::RemoveFromWaitSet(Thread *thread) { 1975f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(owner_ == Thread::Current()); 1985f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(thread != NULL); 1995f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (wait_set_ == NULL) { 2005f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 2015f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 2025f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (wait_set_ == thread) { 203dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers wait_set_ = thread->GetWaitNext(); 204dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers thread->SetWaitNext(nullptr); 2055f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 2065f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 2075f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 2085f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes Thread* t = wait_set_; 209dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers while (t->GetWaitNext() != NULL) { 210dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers if (t->GetWaitNext() == thread) { 211dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers t->SetWaitNext(thread->GetWaitNext()); 212dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers thread->SetWaitNext(nullptr); 2135f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 2145f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 215dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers t = t->GetWaitNext(); 2165f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 2175f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 2185f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 2196aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartiervoid Monitor::SetObject(mirror::Object* object) { 22094f7b49578b6aaa80de8ffed230648d601393905Hiroshi Yamauchi obj_ = GcRoot<mirror::Object>(object); 2216aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier} 2226aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier 2235f79133a435ebcb20000370d56046fe01201dd80Elliott Hughesvoid Monitor::Lock(Thread* self) { 224d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu(self, monitor_lock_); 225d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers while (true) { 226440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier if (owner_ == nullptr) { // Unowned. 227d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers owner_ = self; 228d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers CHECK_EQ(lock_count_, 0); 229d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // When debugging, save the current monitor holder for future 230d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // acquisition failures to use in sampled logging. 231d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (lock_profiling_threshold_ != 0) { 232d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers locking_method_ = self->GetCurrentMethod(&locking_dex_pc_); 233fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes } 234d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; 235d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else if (owner_ == self) { // Recursive. 236d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers lock_count_++; 237d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; 238fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes } 239d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Contended. 240d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers const bool log_contention = (lock_profiling_threshold_ != 0); 24165282b253b55bbdb7f0e246d8c78ea34f84d0ff5Xin Guan uint64_t wait_start_ms = log_contention ? MilliTime() : 0; 242ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers mirror::ArtMethod* owners_method = locking_method_; 243d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t owners_dex_pc = locking_dex_pc_; 244440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier // Do this before releasing the lock so that we don't get deflated. 245440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier ++num_waiters_; 246d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_lock_.Unlock(self); // Let go of locks in order. 247a6e7f0872c42009ecbee82d7fbe452deef9ae65bMathieu Chartier self->SetMonitorEnterObject(GetObject()); 248d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers { 249d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers ScopedThreadStateChange tsc(self, kBlocked); // Change to blocked and give up mutator_lock_. 250d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu2(self, monitor_lock_); // Reacquire monitor_lock_ without mutator_lock_ for Wait. 251d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (owner_ != NULL) { // Did the owner_ give the lock up? 252d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_contenders_.Wait(self); // Still contended so wait. 253d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Woken from contention. 254d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (log_contention) { 255d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint64_t wait_ms = MilliTime() - wait_start_ms; 256d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t sample_percent; 257d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (wait_ms >= lock_profiling_threshold_) { 258d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers sample_percent = 100; 259d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 260d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers sample_percent = 100 * wait_ms / lock_profiling_threshold_; 261d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 262d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (sample_percent != 0 && (static_cast<uint32_t>(rand() % 100) < sample_percent)) { 263d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers const char* owners_filename; 264d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t owners_line_number; 265d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers TranslateLocation(owners_method, owners_dex_pc, &owners_filename, &owners_line_number); 266d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LogContentionEvent(self, wait_ms, sample_percent, owners_filename, owners_line_number); 267d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 268d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 269fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes } 2705f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 271a6e7f0872c42009ecbee82d7fbe452deef9ae65bMathieu Chartier self->SetMonitorEnterObject(nullptr); 272d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_lock_.Lock(self); // Reacquire locks in order. 273440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier --num_waiters_; 274fc86162ce2a3467acb690e18cc8bd9b3daafc606Elliott Hughes } 2755f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 2765f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 2776d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogersstatic void ThrowIllegalMonitorStateExceptionF(const char* fmt, ...) 2786d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers __attribute__((format(printf, 1, 2))); 2796d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers 28000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogersstatic void ThrowIllegalMonitorStateExceptionF(const char* fmt, ...) 281b726dcb581bf72da46527378ccb6889020f0e6e9Ian Rogers SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 2826d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers va_list args; 2836d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers va_start(args, fmt); 28462d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers Thread* self = Thread::Current(); 28562d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 28662d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers self->ThrowNewExceptionV(throw_location, "Ljava/lang/IllegalMonitorStateException;", fmt, args); 287d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (!Runtime::Current()->IsStarted() || VLOG_IS_ON(monitor)) { 28864277f38032208a0c1081ff9e466c04009b96383Brian Carlstrom std::ostringstream ss; 28962d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers self->Dump(ss); 290d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LOG(Runtime::Current()->IsStarted() ? INFO : ERROR) 291d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers << self->GetException(NULL)->Dump() << "\n" << ss.str(); 29264277f38032208a0c1081ff9e466c04009b96383Brian Carlstrom } 2936d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers va_end(args); 2946d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers} 2956d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers 296d423741f91526cada9d081c64ee295ec9863032dElliott Hughesstatic std::string ThreadToString(Thread* thread) { 297d423741f91526cada9d081c64ee295ec9863032dElliott Hughes if (thread == NULL) { 298d423741f91526cada9d081c64ee295ec9863032dElliott Hughes return "NULL"; 299d423741f91526cada9d081c64ee295ec9863032dElliott Hughes } 300d423741f91526cada9d081c64ee295ec9863032dElliott Hughes std::ostringstream oss; 301d423741f91526cada9d081c64ee295ec9863032dElliott Hughes // TODO: alternatively, we could just return the thread's name. 302d423741f91526cada9d081c64ee295ec9863032dElliott Hughes oss << *thread; 303d423741f91526cada9d081c64ee295ec9863032dElliott Hughes return oss.str(); 304d423741f91526cada9d081c64ee295ec9863032dElliott Hughes} 305d423741f91526cada9d081c64ee295ec9863032dElliott Hughes 3062dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogersvoid Monitor::FailedUnlock(mirror::Object* o, Thread* expected_owner, Thread* found_owner, 307ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes Monitor* monitor) { 308ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes Thread* current_owner = NULL; 309ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes std::string current_owner_string; 310ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes std::string expected_owner_string; 311ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes std::string found_owner_string; 312ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes { 313ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes // TODO: isn't this too late to prevent threads from disappearing? 314ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes // Acquire thread list lock so threads won't disappear from under us. 31550b35e2fd1a68cd1240e4a9d9f363e11764957d1Ian Rogers MutexLock mu(Thread::Current(), *Locks::thread_list_lock_); 316ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes // Re-read owner now that we hold lock. 317d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers current_owner = (monitor != NULL) ? monitor->GetOwner() : NULL; 318ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes // Get short descriptions of the threads involved. 319ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes current_owner_string = ThreadToString(current_owner); 320ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes expected_owner_string = ThreadToString(expected_owner); 321ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes found_owner_string = ThreadToString(found_owner); 322ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes } 3236d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers if (current_owner == NULL) { 3246d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers if (found_owner == NULL) { 3256d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("unlock of unowned monitor on object of type '%s'" 3266d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers " on thread '%s'", 327ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes PrettyTypeOf(o).c_str(), 328ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes expected_owner_string.c_str()); 3296d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } else { 3306d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers // Race: the original read found an owner but now there is none 3316d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("unlock of monitor owned by '%s' on object of type '%s'" 3326d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers " (where now the monitor appears unowned) on thread '%s'", 333ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes found_owner_string.c_str(), 334ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes PrettyTypeOf(o).c_str(), 335ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes expected_owner_string.c_str()); 3366d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } 3376d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } else { 3386d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers if (found_owner == NULL) { 3396d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers // Race: originally there was no owner, there is now 3406d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("unlock of monitor owned by '%s' on object of type '%s'" 3416d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers " (originally believed to be unowned) on thread '%s'", 342ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes current_owner_string.c_str(), 343ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes PrettyTypeOf(o).c_str(), 344ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes expected_owner_string.c_str()); 3456d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } else { 3466d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers if (found_owner != current_owner) { 3476d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers // Race: originally found and current owner have changed 3486d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("unlock of monitor originally owned by '%s' (now" 3496d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers " owned by '%s') on object of type '%s' on thread '%s'", 350ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes found_owner_string.c_str(), 351ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes current_owner_string.c_str(), 352ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes PrettyTypeOf(o).c_str(), 353ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes expected_owner_string.c_str()); 3546d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } else { 3556d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("unlock of monitor owned by '%s' on object of type '%s'" 3566d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers " on thread '%s", 357ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes current_owner_string.c_str(), 358ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes PrettyTypeOf(o).c_str(), 359ffb465f23d9549dd591e6aa62e9250523cb00233Elliott Hughes expected_owner_string.c_str()); 3606d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } 3616d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } 3626d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers } 3635f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 3645f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 365d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogersbool Monitor::Unlock(Thread* self) { 3665f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(self != NULL); 367d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu(self, monitor_lock_); 3686d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers Thread* owner = owner_; 3696d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers if (owner == self) { 3705f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // We own the monitor, so nobody else can be in here. 3715f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (lock_count_ == 0) { 3725f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes owner_ = NULL; 37333dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao locking_method_ = NULL; 3740399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers locking_dex_pc_ = 0; 375d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Wake a contender. 376d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_contenders_.Signal(self); 3775f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } else { 3785f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes --lock_count_; 3795f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 3805f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } else { 3815f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // We don't own this, so we're not allowed to unlock it. 3825f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // The JNI spec says that we should throw IllegalMonitorStateException 3835f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // in this case. 3844cba0d979a11f955e6ec3c0f1bf61478af7aa810Hiroshi Yamauchi FailedUnlock(GetObject(), self, owner, this); 3855f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return false; 3865f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 3875f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return true; 3885f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 3895f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 3904cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughesvoid Monitor::Wait(Thread* self, int64_t ms, int32_t ns, 3914cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes bool interruptShouldThrow, ThreadState why) { 3925f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(self != NULL); 3934cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes DCHECK(why == kTimedWaiting || why == kWaiting || why == kSleeping); 3945f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 395d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_lock_.Lock(self); 396d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers 3975f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Make sure that we hold the lock. 3985f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (owner_ != self) { 399d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_lock_.Unlock(self); 4001af6a1fa35ff7dc0a5c653f19dbc8a91c914aa42Elena Sayapina ThrowIllegalMonitorStateExceptionF("object not locked by thread before wait()"); 4015f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 4025f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 4034cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes 404df42c4815c30b9df15aacb88070c1e94f41d0226Elliott Hughes // We need to turn a zero-length timed wait into a regular wait because 405df42c4815c30b9df15aacb88070c1e94f41d0226Elliott Hughes // Object.wait(0, 0) is defined as Object.wait(0), which is defined as Object.wait(). 406df42c4815c30b9df15aacb88070c1e94f41d0226Elliott Hughes if (why == kTimedWaiting && (ms == 0 && ns == 0)) { 407df42c4815c30b9df15aacb88070c1e94f41d0226Elliott Hughes why = kWaiting; 408df42c4815c30b9df15aacb88070c1e94f41d0226Elliott Hughes } 409df42c4815c30b9df15aacb88070c1e94f41d0226Elliott Hughes 4105f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Enforce the timeout range. 4115f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (ms < 0 || ns < 0 || ns > 999999) { 4121af6a1fa35ff7dc0a5c653f19dbc8a91c914aa42Elena Sayapina monitor_lock_.Unlock(self); 41362d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 41462d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers self->ThrowNewExceptionF(throw_location, "Ljava/lang/IllegalArgumentException;", 415ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers "timeout arguments out of range: ms=%" PRId64 " ns=%d", ms, ns); 4165f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 4175f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 4185f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 4195f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes /* 4205f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * Add ourselves to the set of threads waiting on this monitor, and 4215f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * release our hold. We need to let it go even if we're a few levels 4225f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * deep in a recursive lock, and we need to restore that later. 4235f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 4245f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * We append to the wait set ahead of clearing the count and owner 4255f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * fields so the subroutine can check that the calling thread owns 4265f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * the monitor. Aside from that, the order of member updates is 4275f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * not order sensitive as we hold the pthread mutex. 4285f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 4295f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes AppendToWaitSet(self); 430440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier ++num_waiters_; 4310399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers int prev_lock_count = lock_count_; 4325f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes lock_count_ = 0; 4335f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes owner_ = NULL; 434ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogers mirror::ArtMethod* saved_method = locking_method_; 43533dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao locking_method_ = NULL; 4360399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers uintptr_t saved_dex_pc = locking_dex_pc_; 4370399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers locking_dex_pc_ = 0; 4385f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 4395f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes /* 4404cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes * Update thread state. If the GC wakes up, it'll ignore us, knowing 4415f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * that we won't touch any references in this state, and we'll check 4425f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * our suspend mode before we transition out. 4435f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 4444cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes self->TransitionFromRunnableToSuspended(why); 4455f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 446b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes bool was_interrupted = false; 44700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers { 44800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Pseudo-atomically wait on self's wait_cond_ and release the monitor lock. 449dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers MutexLock mu(self, *self->GetWaitMutex()); 4505f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 45100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Set wait_monitor_ to the monitor object we will be waiting on. When wait_monitor_ is 45200f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // non-NULL a notifying or interrupting thread must signal the thread's wait_cond_ to wake it 45300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // up. 454dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers DCHECK(self->GetWaitMonitor() == nullptr); 455dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->SetWaitMonitor(this); 4565f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 45700f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Release the monitor lock. 458d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_contenders_.Signal(self); 459d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_lock_.Unlock(self); 46000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers 461b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes // Handle the case where the thread was interrupted before we called wait(). 462dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers if (self->IsInterruptedLocked()) { 463b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes was_interrupted = true; 46400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } else { 46500f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Wait for a notification or a timeout to occur. 4664cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes if (why == kWaiting) { 467dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->GetWaitConditionVariable()->Wait(self); 46800f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } else { 4694cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes DCHECK(why == kTimedWaiting || why == kSleeping) << why; 470dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->GetWaitConditionVariable()->TimedWait(self, ms, ns); 47100f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 472dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers if (self->IsInterruptedLocked()) { 473b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes was_interrupted = true; 47400f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 475dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->SetInterruptedLocked(false); 47600f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 4775f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 4785f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 47900f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers // Set self->status back to kRunnable, and self-suspend if needed. 48000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers self->TransitionFromSuspendedToRunnable(); 4815f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 482b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes { 483b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes // We reset the thread's wait_monitor_ field after transitioning back to runnable so 484b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes // that a thread in a waiting/sleeping state has a non-null wait_monitor_ for debugging 485b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes // and diagnostic purposes. (If you reset this earlier, stack dumps will claim that threads 486b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes // are waiting on "null".) 487dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers MutexLock mu(self, *self->GetWaitMutex()); 488dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers DCHECK(self->GetWaitMonitor() != nullptr); 489dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->SetWaitMonitor(nullptr); 490b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes } 491b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes 492d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Re-acquire the monitor and lock. 49300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers Lock(self); 494d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers monitor_lock_.Lock(self); 495dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->GetWaitMutex()->AssertNotHeld(self); 4965f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 4975f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes /* 4985f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * We remove our thread from wait set after restoring the count 4995f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * and owner fields so the subroutine can check that the calling 5005f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * thread owns the monitor. Aside from that, the order of member 5015f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * updates is not order sensitive as we hold the pthread mutex. 5025f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 5035f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes owner_ = self; 5040399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers lock_count_ = prev_lock_count; 5050399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers locking_method_ = saved_method; 5060399dde18753aa9bd2bd0d7cf60beef154d164a4Ian Rogers locking_dex_pc_ = saved_dex_pc; 507440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier --num_waiters_; 5085f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes RemoveFromWaitSet(self); 5095f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 5101af6a1fa35ff7dc0a5c653f19dbc8a91c914aa42Elena Sayapina monitor_lock_.Unlock(self); 5111af6a1fa35ff7dc0a5c653f19dbc8a91c914aa42Elena Sayapina 512b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes if (was_interrupted) { 5135f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes /* 5145f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * We were interrupted while waiting, or somebody interrupted an 5155f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * un-interruptible thread earlier and we're bailing out immediately. 5165f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * 5175f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * The doc sayeth: "The interrupted status of the current thread is 5185f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes * cleared when this exception is thrown." 5195f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes */ 52000f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers { 521dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers MutexLock mu(self, *self->GetWaitMutex()); 522dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->SetInterruptedLocked(false); 52300f7d0eaa6bd93d33bf0c1429bf4ba0b3f28abacIan Rogers } 5245f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (interruptShouldThrow) { 52562d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 52662d6c772205b8859f0ebf7ad105402ec4c3e2e01Ian Rogers self->ThrowNewException(throw_location, "Ljava/lang/InterruptedException;", NULL); 5275f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5285f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5295f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 5305f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 5315f79133a435ebcb20000370d56046fe01201dd80Elliott Hughesvoid Monitor::Notify(Thread* self) { 5325f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(self != NULL); 533d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu(self, monitor_lock_); 5345f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Make sure that we hold the lock. 5355f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (owner_ != self) { 5366d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("object not locked by thread before notify()"); 5375f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 5385f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5395f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Signal the first waiting thread in the wait set. 5405f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes while (wait_set_ != NULL) { 5415f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes Thread* thread = wait_set_; 542dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers wait_set_ = thread->GetWaitNext(); 543dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers thread->SetWaitNext(nullptr); 5445f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 5455f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Check to see if the thread is still waiting. 546277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe MutexLock wait_mu(self, *thread->GetWaitMutex()); 547dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers if (thread->GetWaitMonitor() != nullptr) { 548dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers thread->GetWaitConditionVariable()->Signal(self); 5495f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 5505f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5515f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5525f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 5535f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 5545f79133a435ebcb20000370d56046fe01201dd80Elliott Hughesvoid Monitor::NotifyAll(Thread* self) { 5555f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(self != NULL); 556d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu(self, monitor_lock_); 5575f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Make sure that we hold the lock. 5585f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes if (owner_ != self) { 5596d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("object not locked by thread before notifyAll()"); 5605f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes return; 5615f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5625f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Signal all threads in the wait set. 5635f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes while (wait_set_ != NULL) { 5645f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes Thread* thread = wait_set_; 565dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers wait_set_ = thread->GetWaitNext(); 566dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers thread->SetWaitNext(nullptr); 5675f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes thread->Notify(); 5685f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 5695f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 5705f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 571590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartierbool Monitor::Deflate(Thread* self, mirror::Object* obj) { 572590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier DCHECK(obj != nullptr); 5734d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier // Don't need volatile since we only deflate with mutators suspended. 5744d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier LockWord lw(obj->GetLockWord(false)); 575590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // If the lock isn't an inflated monitor, then we don't need to deflate anything. 576590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (lw.GetState() == LockWord::kFatLocked) { 577590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier Monitor* monitor = lw.FatLockMonitor(); 578440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier DCHECK(monitor != nullptr); 579590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier MutexLock mu(self, monitor->monitor_lock_); 580440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier // Can't deflate if we have anybody waiting on the CV. 581440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier if (monitor->num_waiters_ > 0) { 582440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier return false; 583440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier } 584590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier Thread* owner = monitor->owner_; 585590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (owner != nullptr) { 586590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Can't deflate if we are locked and have a hash code. 587590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (monitor->HasHashCode()) { 588590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier return false; 589590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 590590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Can't deflate if our lock count is too high. 591590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier if (monitor->lock_count_ > LockWord::kThinLockMaxCount) { 592590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier return false; 593590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 594590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Deflate to a thin lock. 5954d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier obj->SetLockWord(LockWord::FromThinLockId(owner->GetThreadId(), monitor->lock_count_), false); 5964d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier VLOG(monitor) << "Deflated " << obj << " to thin lock " << owner->GetTid() << " / " 5974d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier << monitor->lock_count_; 598590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } else if (monitor->HasHashCode()) { 5994d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier obj->SetLockWord(LockWord::FromHashCode(monitor->GetHashCode()), false); 600440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier VLOG(monitor) << "Deflated " << obj << " to hash monitor " << monitor->GetHashCode(); 601590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } else { 602590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // No lock and no hash, just put an empty lock word inside the object. 6034d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier obj->SetLockWord(LockWord(), false); 604440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier VLOG(monitor) << "Deflated" << obj << " to empty lock word"; 605590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 606590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // The monitor is deflated, mark the object as nullptr so that we know to delete it during the 607590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // next GC. 60894f7b49578b6aaa80de8ffed230648d601393905Hiroshi Yamauchi monitor->obj_ = GcRoot<mirror::Object>(nullptr); 609590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 610590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier return true; 611590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier} 612590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier 613ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartiervoid Monitor::Inflate(Thread* self, Thread* owner, mirror::Object* obj, int32_t hash_code) { 61474240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe DCHECK(self != nullptr); 61574240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe DCHECK(obj != nullptr); 6165f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes // Allocate and acquire a new monitor. 61774240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe Monitor* m = MonitorPool::CreateMonitor(self, owner, obj, hash_code); 61874240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe DCHECK(m != nullptr); 619d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (m->Install(self)) { 62086ab7912423f63541073af5c487b509e9b2b5420Haifeng Li if (owner != nullptr) { 62186ab7912423f63541073af5c487b509e9b2b5420Haifeng Li VLOG(monitor) << "monitor: thread" << owner->GetThreadId() 62274240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe << " created monitor " << m << " for object " << obj; 62386ab7912423f63541073af5c487b509e9b2b5420Haifeng Li } else { 62486ab7912423f63541073af5c487b509e9b2b5420Haifeng Li VLOG(monitor) << "monitor: Inflate with hashcode " << hash_code 62574240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe << " created monitor " << m << " for object " << obj; 62686ab7912423f63541073af5c487b509e9b2b5420Haifeng Li } 62774240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe Runtime::Current()->GetMonitorList()->Add(m); 6284d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier CHECK_EQ(obj->GetLockWord(true).GetState(), LockWord::kFatLocked); 62974240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe } else { 63074240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe MonitorPool::ReleaseMonitor(self, m); 631ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier } 632ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier} 633ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier 6340cd81352a7c06e381951cea1b104fd73516f4341Mathieu Chartiervoid Monitor::InflateThinLocked(Thread* self, Handle<mirror::Object> obj, LockWord lock_word, 635ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier uint32_t hash_code) { 636ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier DCHECK_EQ(lock_word.GetState(), LockWord::kThinLocked); 637ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier uint32_t owner_thread_id = lock_word.ThinLockOwner(); 638ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier if (owner_thread_id == self->GetThreadId()) { 639ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // We own the monitor, we can easily inflate it. 640eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier Inflate(self, self, obj.Get(), hash_code); 641ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier } else { 642ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier ThreadList* thread_list = Runtime::Current()->GetThreadList(); 643ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // Suspend the owner, inflate. First change to blocked and give up mutator_lock_. 644eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier self->SetMonitorEnterObject(obj.Get()); 645a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier bool timed_out; 646a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier Thread* owner; 647a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier { 648a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier ScopedThreadStateChange tsc(self, kBlocked); 649f3d874c60ee3ada19ce26a5c4e532312b6f3a9e9Ian Rogers // Take suspend thread lock to avoid races with threads trying to suspend this one. 650f3d874c60ee3ada19ce26a5c4e532312b6f3a9e9Ian Rogers MutexLock mu(self, *Locks::thread_list_suspend_thread_lock_); 651a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier owner = thread_list->SuspendThreadByThreadId(owner_thread_id, false, &timed_out); 652a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier } 653a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier if (owner != nullptr) { 654a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier // We succeeded in suspending the thread, check the lock's status didn't change. 655a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier lock_word = obj->GetLockWord(true); 656a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier if (lock_word.GetState() == LockWord::kThinLocked && 657a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier lock_word.ThinLockOwner() == owner_thread_id) { 658a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier // Go ahead and inflate the lock. 659a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier Inflate(self, owner, obj.Get(), hash_code); 660ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier } 661a1ee14fc66a3c99bb7d5744ace881ec93c46f59dMathieu Chartier thread_list->Resume(owner, false); 662ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier } 663dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers self->SetMonitorEnterObject(nullptr); 664d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 6655f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 6665f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 667719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers// Fool annotalysis into thinking that the lock on obj is acquired. 668719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogersstatic mirror::Object* FakeLock(mirror::Object* obj) 669719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers EXCLUSIVE_LOCK_FUNCTION(obj) NO_THREAD_SAFETY_ANALYSIS { 670719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers return obj; 671719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers} 672719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 673719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers// Fool annotalysis into thinking that the lock on obj is release. 674719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogersstatic mirror::Object* FakeUnlock(mirror::Object* obj) 675719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers UNLOCK_FUNCTION(obj) NO_THREAD_SAFETY_ANALYSIS { 676719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers return obj; 677719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers} 678719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers 679e7e8a5fea2d852cccc840fa046151a16627f26cdMathieu Chartiermirror::Object* Monitor::MonitorEnter(Thread* self, mirror::Object* obj) { 6804681c809ba35d50fab92c592ce8d2c7f8b2731f7Elliott Hughes DCHECK(self != NULL); 6814681c809ba35d50fab92c592ce8d2c7f8b2731f7Elliott Hughes DCHECK(obj != NULL); 682719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers obj = FakeLock(obj); 683d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t thread_id = self->GetThreadId(); 684d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers size_t contention_count = 0; 685eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier StackHandleScope<1> hs(self); 686eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier Handle<mirror::Object> h_obj(hs.NewHandle(obj)); 687d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers while (true) { 688eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier LockWord lock_word = h_obj->GetLockWord(true); 689d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers switch (lock_word.GetState()) { 690d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kUnlocked: { 691d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LockWord thin_locked(LockWord::FromThinLockId(thread_id, 0)); 692228602f562f1d130d06e60a98752d99c2d467d6aIan Rogers if (h_obj->CasLockWordWeakSequentiallyConsistent(lock_word, thin_locked)) { 6933035961cb41865b80b927546be0c708b6389cec6Hans Boehm // CasLockWord enforces more than the acquire ordering we need here. 694eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier return h_obj.Get(); // Success! 695d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 696d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers continue; // Go again. 6975f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 698d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kThinLocked: { 699d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t owner_thread_id = lock_word.ThinLockOwner(); 700d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (owner_thread_id == thread_id) { 701d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // We own the lock, increase the recursion count. 702d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t new_count = lock_word.ThinLockCount() + 1; 703d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (LIKELY(new_count <= LockWord::kThinLockMaxCount)) { 704d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LockWord thin_locked(LockWord::FromThinLockId(thread_id, new_count)); 705eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier h_obj->SetLockWord(thin_locked, true); 706eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier return h_obj.Get(); // Success! 707d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 708d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // We'd overflow the recursion count, so inflate the monitor. 709eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier InflateThinLocked(self, h_obj, lock_word, 0); 710d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 711d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 712d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Contention. 713d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers contention_count++; 714ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier Runtime* runtime = Runtime::Current(); 715ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier if (contention_count <= runtime->GetMaxSpinsBeforeThinkLockInflation()) { 716b363f666883860d40823d5528df3c98c897f74f4Mathieu Chartier // TODO: Consider switching the thread state to kBlocked when we are yielding. 717251755cd511463260e60be98bf138b6aa1c14bf3Mathieu Chartier // Use sched_yield instead of NanoSleep since NanoSleep can wait much longer than the 718251755cd511463260e60be98bf138b6aa1c14bf3Mathieu Chartier // parameter you pass in. This can cause thread suspension to take excessively long 719b363f666883860d40823d5528df3c98c897f74f4Mathieu Chartier // and make long pauses. See b/16307460. 720251755cd511463260e60be98bf138b6aa1c14bf3Mathieu Chartier sched_yield(); 7215f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } else { 722d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers contention_count = 0; 723eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier InflateThinLocked(self, h_obj, lock_word, 0); 7245f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 7255f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 726d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers continue; // Start from the beginning. 727d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 728d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kFatLocked: { 729d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 730d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers mon->Lock(self); 731eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier return h_obj.Get(); // Success! 7325f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 733719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers case LockWord::kHashCode: 734ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // Inflate with the existing hashcode. 735eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier Inflate(self, nullptr, h_obj.Get(), lock_word.GetHashCode()); 736719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers continue; // Start from the beginning. 737590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier default: { 738590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier LOG(FATAL) << "Invalid monitor state " << lock_word.GetState(); 739eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier return h_obj.Get(); 740590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 7415f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 7425f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 7435f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 7445f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 7452dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogersbool Monitor::MonitorExit(Thread* self, mirror::Object* obj) { 7465f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(self != NULL); 7475f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes DCHECK(obj != NULL); 748719d1a33f6569864f529e5a3fff59e7bca97aad0Ian Rogers obj = FakeUnlock(obj); 7494d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier LockWord lock_word = obj->GetLockWord(true); 750eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier StackHandleScope<1> hs(self); 751eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier Handle<mirror::Object> h_obj(hs.NewHandle(obj)); 752d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers switch (lock_word.GetState()) { 753ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kHashCode: 754ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // Fall-through. 755d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kUnlocked: 756eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier FailedUnlock(h_obj.Get(), self, nullptr, nullptr); 757d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return false; // Failure. 758d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kThinLocked: { 759d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t thread_id = self->GetThreadId(); 760d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t owner_thread_id = lock_word.ThinLockOwner(); 761d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (owner_thread_id != thread_id) { 762d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // TODO: there's a race here with the owner dying while we unlock. 763d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Thread* owner = 764d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Runtime::Current()->GetThreadList()->FindThreadByThreadId(lock_word.ThinLockOwner()); 765eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier FailedUnlock(h_obj.Get(), self, owner, nullptr); 766d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return false; // Failure. 7675f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } else { 768d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // We own the lock, decrease the recursion count. 769d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (lock_word.ThinLockCount() != 0) { 770d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t new_count = lock_word.ThinLockCount() - 1; 771d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LockWord thin_locked(LockWord::FromThinLockId(thread_id, new_count)); 772eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier h_obj->SetLockWord(thin_locked, true); 773d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 774eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier h_obj->SetLockWord(LockWord(), true); 775d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 776d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return true; // Success! 7775f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 7785f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 779d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kFatLocked: { 780d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 781d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return mon->Unlock(self); 7825f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 783590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier default: { 784590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier LOG(FATAL) << "Invalid monitor state " << lock_word.GetState(); 785d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return false; 786590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 7875f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 7885f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 7895f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 7902dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogersvoid Monitor::Wait(Thread* self, mirror::Object *obj, int64_t ms, int32_t ns, 7914cd121ef0cb35fced70c7d9de378277be7a727d9Elliott Hughes bool interruptShouldThrow, ThreadState why) { 7924d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK(self != nullptr); 7934d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK(obj != nullptr); 7944d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier LockWord lock_word = obj->GetLockWord(true); 79543c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers while (lock_word.GetState() != LockWord::kFatLocked) { 79643c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers switch (lock_word.GetState()) { 79743c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers case LockWord::kHashCode: 79843c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers // Fall-through. 79943c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers case LockWord::kUnlocked: 800d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers ThrowIllegalMonitorStateExceptionF("object not locked by thread before wait()"); 801d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; // Failure. 80243c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers case LockWord::kThinLocked: { 80343c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers uint32_t thread_id = self->GetThreadId(); 80443c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers uint32_t owner_thread_id = lock_word.ThinLockOwner(); 80543c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers if (owner_thread_id != thread_id) { 80643c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers ThrowIllegalMonitorStateExceptionF("object not locked by thread before wait()"); 80743c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers return; // Failure. 80843c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers } else { 80943c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers // We own the lock, inflate to enqueue ourself on the Monitor. May fail spuriously so 81043c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers // re-load. 81143c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers Inflate(self, self, obj, 0); 81243c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers lock_word = obj->GetLockWord(true); 81343c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers } 81443c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers break; 81543c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers } 81643c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers case LockWord::kFatLocked: // Unreachable given the loop condition above. Fall-through. 81743c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers default: { 81843c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers LOG(FATAL) << "Invalid monitor state " << lock_word.GetState(); 81943c69cc4cea794cd4d89d9d0680b1e25c6d02accIan Rogers return; 820d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 821590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 8225f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 823d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 824d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers mon->Wait(self, ms, ns, interruptShouldThrow, why); 8255f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 8265f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 82713c479e7e9b62115fe0409e5273c1e976a1c09f9Ian Rogersvoid Monitor::DoNotify(Thread* self, mirror::Object* obj, bool notify_all) { 8284d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK(self != nullptr); 8294d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK(obj != nullptr); 8304d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier LockWord lock_word = obj->GetLockWord(true); 831d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers switch (lock_word.GetState()) { 832ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kHashCode: 833ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // Fall-through. 834d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kUnlocked: 8356d0b13e931fb73d5e964d14b0a7ecd1f3f5db547Ian Rogers ThrowIllegalMonitorStateExceptionF("object not locked by thread before notify()"); 836d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; // Failure. 837d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kThinLocked: { 838d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t thread_id = self->GetThreadId(); 839d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t owner_thread_id = lock_word.ThinLockOwner(); 840d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (owner_thread_id != thread_id) { 841d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers ThrowIllegalMonitorStateExceptionF("object not locked by thread before notify()"); 842d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; // Failure. 843d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 844d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // We own the lock but there's no Monitor and therefore no waiters. 845d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; // Success. 846d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 847d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 848d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kFatLocked: { 849d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 850d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (notify_all) { 851d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers mon->NotifyAll(self); 852d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 853d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers mon->Notify(self); 854d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 855d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return; // Success. 8565f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 857590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier default: { 858590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier LOG(FATAL) << "Invalid monitor state " << lock_word.GetState(); 859590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier return; 860590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 8615f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 8625f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 8635f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 864d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogersuint32_t Monitor::GetLockOwnerThreadId(mirror::Object* obj) { 8654d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK(obj != nullptr); 8664d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier LockWord lock_word = obj->GetLockWord(true); 867d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers switch (lock_word.GetState()) { 868ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kHashCode: 869ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // Fall-through. 870d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kUnlocked: 871d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return ThreadList::kInvalidThreadId; 872d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kThinLocked: 873d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return lock_word.ThinLockOwner(); 874d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kFatLocked: { 875d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 876d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return mon->GetOwnerThreadId(); 8775f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 878590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier default: { 879d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LOG(FATAL) << "Unreachable"; 8802c4257be8191c5eefde744e8965fcefc80a0a97dIan Rogers UNREACHABLE(); 881590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier } 8825f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes } 8835f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} 8845f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes 8858e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughesvoid Monitor::DescribeWait(std::ostream& os, const Thread* thread) { 886d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers // Determine the wait message and object we're waiting or blocked upon. 887d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers mirror::Object* pretty_object = nullptr; 888d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers const char* wait_message = nullptr; 889d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers uint32_t lock_owner = ThreadList::kInvalidThreadId; 890d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers ThreadState state = thread->GetState(); 891b4e94fd380a84c755264e8668a16052442c7ec32Elliott Hughes if (state == kWaiting || state == kTimedWaiting || state == kSleeping) { 892d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers wait_message = (state == kSleeping) ? " - sleeping on " : " - waiting on "; 893d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers Thread* self = Thread::Current(); 894d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers MutexLock mu(self, *thread->GetWaitMutex()); 895d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers Monitor* monitor = thread->GetWaitMonitor(); 896d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers if (monitor != nullptr) { 8974cba0d979a11f955e6ec3c0f1bf61478af7aa810Hiroshi Yamauchi pretty_object = monitor->GetObject(); 8988e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes } 89934e069606d6f1698cd3c33b39e72b79ae27e1c7bElliott Hughes } else if (state == kBlocked) { 900d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers wait_message = " - waiting to lock "; 901d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers pretty_object = thread->GetMonitorEnterObject(); 902d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers if (pretty_object != nullptr) { 903d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers lock_owner = pretty_object->GetLockOwnerThreadId(); 9048e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes } 9058e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes } 9068e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes 907d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers if (wait_message != nullptr) { 908d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers if (pretty_object == nullptr) { 909d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers os << wait_message << "an unknown object"; 910d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers } else { 9114d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier if ((pretty_object->GetLockWord(true).GetState() == LockWord::kThinLocked) && 912d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers Locks::mutator_lock_->IsExclusiveHeld(Thread::Current())) { 913d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers // Getting the identity hashcode here would result in lock inflation and suspension of the 914d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers // current thread, which isn't safe if this is the only runnable thread. 915d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers os << wait_message << StringPrintf("<@addr=0x%" PRIxPTR "> (a %s)", 916d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers reinterpret_cast<intptr_t>(pretty_object), 917d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers PrettyTypeOf(pretty_object).c_str()); 918d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers } else { 919d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers // - waiting on <0x6008c468> (a java.lang.Class<java.lang.ref.ReferenceQueue>) 920d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers os << wait_message << StringPrintf("<0x%08x> (a %s)", pretty_object->IdentityHashCode(), 921d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers PrettyTypeOf(pretty_object).c_str()); 922d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers } 923d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers } 924d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers // - waiting to lock <0x613f83d8> (a java.lang.Object) held by thread 5 925d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers if (lock_owner != ThreadList::kInvalidThreadId) { 926d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers os << " held by thread " << lock_owner; 927d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers } 928d803bc7ce255be6c16eaf6a8a58a742515e9da9fIan Rogers os << "\n"; 9298e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes } 9308e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes} 9318e4aac52962d54cb4be2078b9cd95685e067133aElliott Hughes 9322dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogersmirror::Object* Monitor::GetContendedMonitor(Thread* thread) { 933f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes // This is used to implement JDWP's ThreadReference.CurrentContendedMonitor, and has a bizarre 934f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes // definition of contended that includes a monitor a thread is trying to enter... 935dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers mirror::Object* result = thread->GetMonitorEnterObject(); 936d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (result == NULL) { 937d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // ...but also a monitor that the thread is waiting on. 938dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers MutexLock mu(Thread::Current(), *thread->GetWaitMutex()); 939dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers Monitor* monitor = thread->GetWaitMonitor(); 940f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes if (monitor != NULL) { 941d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers result = monitor->GetObject(); 942f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes } 943f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes } 944d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return result; 945f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes} 946f9501700f51586cb6ba7cc0ffcb5a920bd64adf1Elliott Hughes 9472dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogersvoid Monitor::VisitLocks(StackVisitor* stack_visitor, void (*callback)(mirror::Object*, void*), 948956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe void* callback_context, bool abort_on_failure) { 949ea46f950e7a51585db293cd7f047de190a482414Brian Carlstrom mirror::ArtMethod* m = stack_visitor->GetMethod(); 95008fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes CHECK(m != NULL); 95108fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 95208fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes // Native methods are an easy special case. 95308fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes // TODO: use the JNI implementation's table of explicit MonitorEnter calls and dump those too. 95408fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes if (m->IsNative()) { 95508fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes if (m->IsSynchronized()) { 956eb8167a4f4d27fce0530f6724ab8032610cd146bMathieu Chartier mirror::Object* jni_this = stack_visitor->GetCurrentHandleScope()->GetReference(0); 9574993bbc8eda377804e585efd918f8ab9d9eab7d4Elliott Hughes callback(jni_this, callback_context); 95808fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes } 95908fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes return; 96008fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes } 96108fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 96261f916cc4757610ce308bfdea9a00cf29afd2b02jeffhao // Proxy methods should not be synchronized. 96361f916cc4757610ce308bfdea9a00cf29afd2b02jeffhao if (m->IsProxyMethod()) { 96461f916cc4757610ce308bfdea9a00cf29afd2b02jeffhao CHECK(!m->IsSynchronized()); 96561f916cc4757610ce308bfdea9a00cf29afd2b02jeffhao return; 96661f916cc4757610ce308bfdea9a00cf29afd2b02jeffhao } 96761f916cc4757610ce308bfdea9a00cf29afd2b02jeffhao 96808fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes // Is there any reason to believe there's any synchronization in this method? 969bfd9a4378eacaf2dc2bbe05ad48c5164fc93c9feMathieu Chartier const DexFile::CodeItem* code_item = m->GetCodeItem(); 970caf7654a0e6c76c7489970b1a246fccf220f9982Elliott Hughes CHECK(code_item != NULL) << PrettyMethod(m); 97108fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes if (code_item->tries_size_ == 0) { 9727934ac288acfb2552bb0b06ec1f61e5820d924a4Brian Carlstrom return; // No "tries" implies no synchronization, so no held locks to report. 97308fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes } 97408fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 975956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe // Get the dex pc. If abort_on_failure is false, GetDexPc will not abort in the case it cannot 976956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe // find the dex pc, and instead return kDexNoIndex. Then bail out, as it indicates we have an 977956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe // inconsistent stack anyways. 978956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe uint32_t dex_pc = stack_visitor->GetDexPc(abort_on_failure); 979956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe if (!abort_on_failure && dex_pc == DexFile::kDexNoIndex) { 980956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe LOG(ERROR) << "Could not find dex_pc for " << PrettyMethod(m); 981956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe return; 982956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe } 983956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe 98480537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes // Ask the verifier for the dex pcs of all the monitor-enter instructions corresponding to 98580537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes // the locks held in this stack frame. 98680537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes std::vector<uint32_t> monitor_enter_dex_pcs; 987956a5228276693a7317ae6b41bfe7a7f0f3cbe6bAndreas Gampe verifier::MethodVerifier::FindLocksAtDexPc(m, dex_pc, &monitor_enter_dex_pcs); 98880537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes if (monitor_enter_dex_pcs.empty()) { 98980537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes return; 99080537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes } 99108fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 99280537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes for (size_t i = 0; i < monitor_enter_dex_pcs.size(); ++i) { 99380537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes // The verifier works in terms of the dex pcs of the monitor-enter instructions. 99480537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes // We want the registers used by those instructions (so we can read the values out of them). 995277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe uint32_t monitor_dex_pc = monitor_enter_dex_pcs[i]; 996277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe uint16_t monitor_enter_instruction = code_item->insns_[monitor_dex_pc]; 99708fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 99880537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes // Quick sanity check. 99980537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes if ((monitor_enter_instruction & 0xff) != Instruction::MONITOR_ENTER) { 1000277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampe LOG(FATAL) << "expected monitor-enter @" << monitor_dex_pc << "; was " 100180537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes << reinterpret_cast<void*>(monitor_enter_instruction); 100208fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes } 100380537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes 100480537bb742dff4ccdf6d04b1c0bb7d2179acc8cbElliott Hughes uint16_t monitor_register = ((monitor_enter_instruction >> 8) & 0xff); 10052dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers mirror::Object* o = reinterpret_cast<mirror::Object*>(stack_visitor->GetVReg(m, monitor_register, 10062dd0e2cea360bc9206eb88ecc40d259e796c239dIan Rogers kReferenceVReg)); 10074993bbc8eda377804e585efd918f8ab9d9eab7d4Elliott Hughes callback(o, callback_context); 100808fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes } 100908fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes} 101008fc03ae5dded4adc9b45b7014a4b9dfedbe95a6Elliott Hughes 1011d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogersbool Monitor::IsValidLockWord(LockWord lock_word) { 1012d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers switch (lock_word.GetState()) { 1013d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kUnlocked: 1014d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Nothing to check. 1015d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return true; 1016d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kThinLocked: 1017d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Basic sanity check of owner. 1018d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return lock_word.ThinLockOwner() != ThreadList::kInvalidThreadId; 1019d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kFatLocked: { 1020d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Check the monitor appears in the monitor list. 1021d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 1022d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MonitorList* list = Runtime::Current()->GetMonitorList(); 1023d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu(Thread::Current(), list->monitor_list_lock_); 1024d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers for (Monitor* list_mon : list->list_) { 1025d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (mon == list_mon) { 1026d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return true; // Found our monitor. 1027d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 10287dfb28c066159e6cde8181720f0c451a700ef966Ian Rogers } 1029d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return false; // Fail - unowned monitor in an object. 10307dfb28c066159e6cde8181720f0c451a700ef966Ian Rogers } 1031ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kHashCode: 1032ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier return true; 1033d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers default: 1034d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers LOG(FATAL) << "Unreachable"; 10352c4257be8191c5eefde744e8965fcefc80a0a97dIan Rogers UNREACHABLE(); 10367dfb28c066159e6cde8181720f0c451a700ef966Ian Rogers } 10377dfb28c066159e6cde8181720f0c451a700ef966Ian Rogers} 10387dfb28c066159e6cde8181720f0c451a700ef966Ian Rogers 1039ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartierbool Monitor::IsLocked() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 1040ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier MutexLock mu(Thread::Current(), monitor_lock_); 1041ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier return owner_ != nullptr; 1042ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier} 1043ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier 1044ef7d42fca18c16fbaf103822ad16f23246e2905dIan Rogersvoid Monitor::TranslateLocation(mirror::ArtMethod* method, uint32_t dex_pc, 1045d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers const char** source_file, uint32_t* line_number) const { 104633dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao // If method is null, location is unknown 104733dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao if (method == NULL) { 1048d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers *source_file = ""; 1049d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers *line_number = 0; 105033dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao return; 105133dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao } 1052bfd9a4378eacaf2dc2bbe05ad48c5164fc93c9feMathieu Chartier *source_file = method->GetDeclaringClassSourceFile(); 1053d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (*source_file == NULL) { 1054d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers *source_file = ""; 1055d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 1056bfd9a4378eacaf2dc2bbe05ad48c5164fc93c9feMathieu Chartier *line_number = method->GetLineNumFromDexPC(dex_pc); 1057d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers} 1058d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers 1059d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogersuint32_t Monitor::GetOwnerThreadId() { 1060d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers MutexLock mu(Thread::Current(), monitor_lock_); 1061d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Thread* owner = owner_; 1062d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers if (owner != NULL) { 1063d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return owner->GetThreadId(); 1064d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } else { 1065d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers return ThreadList::kInvalidThreadId; 106612c51e3e5a8b5655351539618f1cf2331f52d1abElliott Hughes } 106733dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao} 106833dc7717cd16592bcc825350bea6305be9eb2ea1jeffhao 1069c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu ChartierMonitorList::MonitorList() 1070440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier : allow_new_monitors_(true), monitor_list_lock_("MonitorList lock", kMonitorListLock), 1071c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier monitor_add_condition_("MonitorList disallow condition", monitor_list_lock_) { 1072c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes} 1073c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes 1074c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott HughesMonitorList::~MonitorList() { 107574240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe Thread* self = Thread::Current(); 107674240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe MutexLock mu(self, monitor_list_lock_); 107774240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe // Release all monitors to the pool. 107874240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe // TODO: Is it an invariant that *all* open monitors are in the list? Then we could 107974240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe // clear faster in the pool. 108074240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe MonitorPool::ReleaseMonitors(self, &list_); 1081c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes} 1082c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes 1083c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartiervoid MonitorList::DisallowNewMonitors() { 108450b35e2fd1a68cd1240e4a9d9f363e11764957d1Ian Rogers MutexLock mu(Thread::Current(), monitor_list_lock_); 1085c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier allow_new_monitors_ = false; 1086c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier} 1087c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier 1088c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartiervoid MonitorList::AllowNewMonitors() { 1089c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier Thread* self = Thread::Current(); 1090c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier MutexLock mu(self, monitor_list_lock_); 1091c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier allow_new_monitors_ = true; 1092c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier monitor_add_condition_.Broadcast(self); 1093c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier} 1094c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier 1095c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartiervoid MonitorList::Add(Monitor* m) { 1096c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier Thread* self = Thread::Current(); 1097c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier MutexLock mu(self, monitor_list_lock_); 1098c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier while (UNLIKELY(!allow_new_monitors_)) { 1099c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier monitor_add_condition_.WaitHoldingLocks(self); 1100c11d9b8870de5f860b13c84003ade7b3f3125a52Mathieu Chartier } 1101c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes list_.push_front(m); 1102c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes} 1103c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes 110483c8ee000d525017ead8753fce6bc1020249b96aMathieu Chartiervoid MonitorList::SweepMonitorList(IsMarkedCallback* callback, void* arg) { 110574240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe Thread* self = Thread::Current(); 110674240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe MutexLock mu(self, monitor_list_lock_); 110702e25119b15a6f619f17db99f5d05124a5807ff3Mathieu Chartier for (auto it = list_.begin(); it != list_.end(); ) { 1108c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes Monitor* m = *it; 11094cba0d979a11f955e6ec3c0f1bf61478af7aa810Hiroshi Yamauchi // Disable the read barrier in GetObject() as this is called by GC. 11104cba0d979a11f955e6ec3c0f1bf61478af7aa810Hiroshi Yamauchi mirror::Object* obj = m->GetObject<kWithoutReadBarrier>(); 1111590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // The object of a monitor can be null if we have deflated it. 111283c8ee000d525017ead8753fce6bc1020249b96aMathieu Chartier mirror::Object* new_obj = obj != nullptr ? callback(obj, arg) : nullptr; 11136aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier if (new_obj == nullptr) { 11146aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier VLOG(monitor) << "freeing monitor " << m << " belonging to unmarked object " 11154cba0d979a11f955e6ec3c0f1bf61478af7aa810Hiroshi Yamauchi << obj; 111674240819ae09e29b2753ef38f4eb4be1c2762e2eAndreas Gampe MonitorPool::ReleaseMonitor(self, m); 1117c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes it = list_.erase(it); 1118c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes } else { 11196aa3df965395566ed6a4fec4af37c2b7577992e9Mathieu Chartier m->SetObject(new_obj); 1120c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes ++it; 1121c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes } 1122c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes } 1123c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes} 1124c33a32bccc4c66ed82ce3a580b16636399385cb4Elliott Hughes 112548ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartierstruct MonitorDeflateArgs { 112648ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier MonitorDeflateArgs() : self(Thread::Current()), deflate_count(0) {} 112748ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier Thread* const self; 112848ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier size_t deflate_count; 112948ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier}; 113048ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier 1131440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartierstatic mirror::Object* MonitorDeflateCallback(mirror::Object* object, void* arg) 1132440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 113348ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier MonitorDeflateArgs* args = reinterpret_cast<MonitorDeflateArgs*>(arg); 113448ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier if (Monitor::Deflate(args->self, object)) { 11354d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK_NE(object->GetLockWord(true).GetState(), LockWord::kFatLocked); 113648ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier ++args->deflate_count; 1137440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier // If we deflated, return nullptr so that the monitor gets removed from the array. 1138440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier return nullptr; 1139440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier } 1140440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier return object; // Monitor was not deflated. 1141440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier} 1142440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier 114348ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartiersize_t MonitorList::DeflateMonitors() { 114448ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier MonitorDeflateArgs args; 114548ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier Locks::mutator_lock_->AssertExclusiveHeld(args.self); 114648ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier SweepMonitorList(MonitorDeflateCallback, &args); 114748ab687d1f864fec93c2682de6fdc44ab784e2f8Mathieu Chartier return args.deflate_count; 1148440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier} 1149440e4ceb310349ee8eb569495bc04d3d7fbe71cbMathieu Chartier 1150d9c4fc94fa618617f94e1de9af5f034549100753Ian RogersMonitorInfo::MonitorInfo(mirror::Object* obj) : owner_(NULL), entry_count_(0) { 11514d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier DCHECK(obj != nullptr); 11524d7f61d44a732cfbc8573e5d93364983fd746888Mathieu Chartier LockWord lock_word = obj->GetLockWord(true); 1153d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers switch (lock_word.GetState()) { 1154d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kUnlocked: 1155ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier // Fall-through. 1156590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier case LockWord::kForwardingAddress: 1157590fee9e8972f872301c2d16a575d579ee564beeMathieu Chartier // Fall-through. 1158ad2541a59c00c2c69e8973088891a2b5257c9780Mathieu Chartier case LockWord::kHashCode: 1159d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers break; 1160d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kThinLocked: 1161d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers owner_ = Runtime::Current()->GetThreadList()->FindThreadByThreadId(lock_word.ThinLockOwner()); 1162d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers entry_count_ = 1 + lock_word.ThinLockCount(); 1163d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers // Thin locks have no waiters. 1164d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers break; 1165d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers case LockWord::kFatLocked: { 1166d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers Monitor* mon = lock_word.FatLockMonitor(); 1167d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers owner_ = mon->owner_; 1168d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers entry_count_ = 1 + mon->lock_count_; 1169dd7624d2b9e599d57762d12031b10b89defc9807Ian Rogers for (Thread* waiter = mon->wait_set_; waiter != NULL; waiter = waiter->GetWaitNext()) { 1170d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers waiters_.push_back(waiter); 1171d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers } 1172d9c4fc94fa618617f94e1de9af5f034549100753Ian Rogers break; 1173f327e07b37e349b1ec5eaad6dc294a9b7a081d20Elliott Hughes } 1174f327e07b37e349b1ec5eaad6dc294a9b7a081d20Elliott Hughes } 1175f327e07b37e349b1ec5eaad6dc294a9b7a081d20Elliott Hughes} 1176f327e07b37e349b1ec5eaad6dc294a9b7a081d20Elliott Hughes 11775f79133a435ebcb20000370d56046fe01201dd80Elliott Hughes} // namespace art 1178