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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_SCOPED_THREAD_STATE_CHANGE_INL_H_
#define ART_RUNTIME_SCOPED_THREAD_STATE_CHANGE_INL_H_
#include "scoped_thread_state_change.h"
#include <android-base/logging.h>
#include "base/casts.h"
#include "jni_env_ext-inl.h"
#include "obj_ptr-inl.h"
#include "runtime.h"
#include "thread-inl.h"
namespace art {
inline ScopedThreadStateChange::ScopedThreadStateChange(Thread* self, ThreadState new_thread_state)
: self_(self), thread_state_(new_thread_state), expected_has_no_thread_(false) {
if (UNLIKELY(self_ == nullptr)) {
// Value chosen arbitrarily and won't be used in the destructor since thread_ == null.
old_thread_state_ = kTerminated;
Runtime* runtime = Runtime::Current();
CHECK(runtime == nullptr || !runtime->IsStarted() || runtime->IsShuttingDown(self_));
} else {
DCHECK_EQ(self, Thread::Current());
// Read state without locks, ok as state is effectively thread local and we're not interested
// in the suspend count (this will be handled in the runnable transitions).
old_thread_state_ = self->GetState();
if (old_thread_state_ != new_thread_state) {
if (new_thread_state == kRunnable) {
self_->TransitionFromSuspendedToRunnable();
} else if (old_thread_state_ == kRunnable) {
self_->TransitionFromRunnableToSuspended(new_thread_state);
} else {
// A suspended transition to another effectively suspended transition, ok to use Unsafe.
self_->SetState(new_thread_state);
}
}
}
}
inline ScopedThreadStateChange::~ScopedThreadStateChange() {
if (UNLIKELY(self_ == nullptr)) {
if (!expected_has_no_thread_) {
Runtime* runtime = Runtime::Current();
bool shutting_down = (runtime == nullptr) || runtime->IsShuttingDown(nullptr);
CHECK(shutting_down);
}
} else {
if (old_thread_state_ != thread_state_) {
if (old_thread_state_ == kRunnable) {
self_->TransitionFromSuspendedToRunnable();
} else if (thread_state_ == kRunnable) {
self_->TransitionFromRunnableToSuspended(old_thread_state_);
} else {
// A suspended transition to another effectively suspended transition, ok to use Unsafe.
self_->SetState(old_thread_state_);
}
}
}
}
template<typename T>
inline T ScopedObjectAccessAlreadyRunnable::AddLocalReference(ObjPtr<mirror::Object> obj) const {
Locks::mutator_lock_->AssertSharedHeld(Self());
if (kIsDebugBuild) {
CHECK(IsRunnable()); // Don't work with raw objects in non-runnable states.
DCheckObjIsNotClearedJniWeakGlobal(obj);
}
return obj == nullptr ? nullptr : Env()->AddLocalReference<T>(obj);
}
template<typename T>
inline ObjPtr<T> ScopedObjectAccessAlreadyRunnable::Decode(jobject obj) const {
Locks::mutator_lock_->AssertSharedHeld(Self());
DCHECK(IsRunnable()); // Don't work with raw objects in non-runnable states.
return ObjPtr<T>::DownCast(Self()->DecodeJObject(obj));
}
inline bool ScopedObjectAccessAlreadyRunnable::IsRunnable() const {
return self_->GetState() == kRunnable;
}
inline ScopedObjectAccessAlreadyRunnable::ScopedObjectAccessAlreadyRunnable(JNIEnv* env)
: self_(ThreadForEnv(env)), env_(down_cast<JNIEnvExt*>(env)), vm_(env_->vm) {}
inline ScopedObjectAccessAlreadyRunnable::ScopedObjectAccessAlreadyRunnable(Thread* self)
: self_(self),
env_(down_cast<JNIEnvExt*>(self->GetJniEnv())),
vm_(env_ != nullptr ? env_->vm : nullptr) {}
inline ScopedObjectAccessUnchecked::ScopedObjectAccessUnchecked(JNIEnv* env)
: ScopedObjectAccessAlreadyRunnable(env), tsc_(Self(), kRunnable) {
Self()->VerifyStack();
Locks::mutator_lock_->AssertSharedHeld(Self());
}
inline ScopedObjectAccessUnchecked::ScopedObjectAccessUnchecked(Thread* self)
: ScopedObjectAccessAlreadyRunnable(self), tsc_(self, kRunnable) {
Self()->VerifyStack();
Locks::mutator_lock_->AssertSharedHeld(Self());
}
inline ScopedObjectAccess::ScopedObjectAccess(JNIEnv* env) : ScopedObjectAccessUnchecked(env) {}
inline ScopedObjectAccess::ScopedObjectAccess(Thread* self) : ScopedObjectAccessUnchecked(self) {}
inline ScopedObjectAccess::~ScopedObjectAccess() {}
inline ScopedThreadSuspension::ScopedThreadSuspension(Thread* self, ThreadState suspended_state)
: self_(self), suspended_state_(suspended_state) {
DCHECK(self_ != nullptr);
self_->TransitionFromRunnableToSuspended(suspended_state);
}
inline ScopedThreadSuspension::~ScopedThreadSuspension() {
DCHECK_EQ(self_->GetState(), suspended_state_);
self_->TransitionFromSuspendedToRunnable();
}
} // namespace art
#endif // ART_RUNTIME_SCOPED_THREAD_STATE_CHANGE_INL_H_
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