1/* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef ART_RUNTIME_SCOPED_THREAD_STATE_CHANGE_INL_H_ 18#define ART_RUNTIME_SCOPED_THREAD_STATE_CHANGE_INL_H_ 19 20#include "scoped_thread_state_change.h" 21 22#include "base/casts.h" 23#include "jni_env_ext-inl.h" 24#include "obj_ptr-inl.h" 25#include "thread-inl.h" 26 27namespace art { 28 29inline ScopedThreadStateChange::ScopedThreadStateChange(Thread* self, ThreadState new_thread_state) 30 : self_(self), thread_state_(new_thread_state), expected_has_no_thread_(false) { 31 if (UNLIKELY(self_ == nullptr)) { 32 // Value chosen arbitrarily and won't be used in the destructor since thread_ == null. 33 old_thread_state_ = kTerminated; 34 Runtime* runtime = Runtime::Current(); 35 CHECK(runtime == nullptr || !runtime->IsStarted() || runtime->IsShuttingDown(self_)); 36 } else { 37 DCHECK_EQ(self, Thread::Current()); 38 // Read state without locks, ok as state is effectively thread local and we're not interested 39 // in the suspend count (this will be handled in the runnable transitions). 40 old_thread_state_ = self->GetState(); 41 if (old_thread_state_ != new_thread_state) { 42 if (new_thread_state == kRunnable) { 43 self_->TransitionFromSuspendedToRunnable(); 44 } else if (old_thread_state_ == kRunnable) { 45 self_->TransitionFromRunnableToSuspended(new_thread_state); 46 } else { 47 // A suspended transition to another effectively suspended transition, ok to use Unsafe. 48 self_->SetState(new_thread_state); 49 } 50 } 51 } 52} 53 54inline ScopedThreadStateChange::~ScopedThreadStateChange() { 55 if (UNLIKELY(self_ == nullptr)) { 56 if (!expected_has_no_thread_) { 57 Runtime* runtime = Runtime::Current(); 58 bool shutting_down = (runtime == nullptr) || runtime->IsShuttingDown(nullptr); 59 CHECK(shutting_down); 60 } 61 } else { 62 if (old_thread_state_ != thread_state_) { 63 if (old_thread_state_ == kRunnable) { 64 self_->TransitionFromSuspendedToRunnable(); 65 } else if (thread_state_ == kRunnable) { 66 self_->TransitionFromRunnableToSuspended(old_thread_state_); 67 } else { 68 // A suspended transition to another effectively suspended transition, ok to use Unsafe. 69 self_->SetState(old_thread_state_); 70 } 71 } 72 } 73} 74 75template<typename T> 76inline T ScopedObjectAccessAlreadyRunnable::AddLocalReference(ObjPtr<mirror::Object> obj) const { 77 Locks::mutator_lock_->AssertSharedHeld(Self()); 78 if (kIsDebugBuild) { 79 CHECK(IsRunnable()); // Don't work with raw objects in non-runnable states. 80 DCheckObjIsNotClearedJniWeakGlobal(obj); 81 } 82 return obj == nullptr ? nullptr : Env()->AddLocalReference<T>(obj); 83} 84 85template<typename T> 86inline ObjPtr<T> ScopedObjectAccessAlreadyRunnable::Decode(jobject obj) const { 87 Locks::mutator_lock_->AssertSharedHeld(Self()); 88 DCHECK(IsRunnable()); // Don't work with raw objects in non-runnable states. 89 return ObjPtr<T>::DownCast(Self()->DecodeJObject(obj)); 90} 91 92inline bool ScopedObjectAccessAlreadyRunnable::IsRunnable() const { 93 return self_->GetState() == kRunnable; 94} 95 96inline ScopedObjectAccessAlreadyRunnable::ScopedObjectAccessAlreadyRunnable(JNIEnv* env) 97 : self_(ThreadForEnv(env)), env_(down_cast<JNIEnvExt*>(env)), vm_(env_->vm) {} 98 99inline ScopedObjectAccessAlreadyRunnable::ScopedObjectAccessAlreadyRunnable(Thread* self) 100 : self_(self), 101 env_(down_cast<JNIEnvExt*>(self->GetJniEnv())), 102 vm_(env_ != nullptr ? env_->vm : nullptr) {} 103 104inline ScopedObjectAccessUnchecked::ScopedObjectAccessUnchecked(JNIEnv* env) 105 : ScopedObjectAccessAlreadyRunnable(env), tsc_(Self(), kRunnable) { 106 Self()->VerifyStack(); 107 Locks::mutator_lock_->AssertSharedHeld(Self()); 108} 109 110inline ScopedObjectAccessUnchecked::ScopedObjectAccessUnchecked(Thread* self) 111 : ScopedObjectAccessAlreadyRunnable(self), tsc_(self, kRunnable) { 112 Self()->VerifyStack(); 113 Locks::mutator_lock_->AssertSharedHeld(Self()); 114} 115 116inline ScopedObjectAccess::ScopedObjectAccess(JNIEnv* env) : ScopedObjectAccessUnchecked(env) {} 117inline ScopedObjectAccess::ScopedObjectAccess(Thread* self) : ScopedObjectAccessUnchecked(self) {} 118inline ScopedObjectAccess::~ScopedObjectAccess() {} 119 120inline ScopedThreadSuspension::ScopedThreadSuspension(Thread* self, ThreadState suspended_state) 121 : self_(self), suspended_state_(suspended_state) { 122 DCHECK(self_ != nullptr); 123 self_->TransitionFromRunnableToSuspended(suspended_state); 124} 125 126inline ScopedThreadSuspension::~ScopedThreadSuspension() { 127 DCHECK_EQ(self_->GetState(), suspended_state_); 128 self_->TransitionFromSuspendedToRunnable(); 129} 130 131} // namespace art 132 133#endif // ART_RUNTIME_SCOPED_THREAD_STATE_CHANGE_INL_H_ 134