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// Copyright (C) 2014 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.
#include "emugl/common/thread.h"
#include "emugl/common/thread_store.h"
#include <stdio.h>
namespace emugl {
namespace {
class ScopedLocker {
public:
ScopedLocker(pthread_mutex_t* mutex) : mMutex(mutex) {
pthread_mutex_lock(mMutex);
}
~ScopedLocker() {
pthread_mutex_unlock(mMutex);
}
private:
pthread_mutex_t* mMutex;
};
} // namespace
Thread::Thread() :
mThread((pthread_t)NULL),
mExitStatus(0),
mIsRunning(false) {
pthread_mutex_init(&mLock, NULL);
}
Thread::~Thread() {
pthread_mutex_destroy(&mLock);
}
bool Thread::start() {
bool ret = true;
pthread_mutex_lock(&mLock);
mIsRunning = true;
if (pthread_create(&mThread, NULL, thread_main, this)) {
ret = false;
mIsRunning = false;
}
pthread_mutex_unlock(&mLock);
return ret;
}
bool Thread::wait(intptr_t *exitStatus) {
{
ScopedLocker locker(&mLock);
if (!mIsRunning) {
// Thread already stopped.
if (exitStatus) {
*exitStatus = mExitStatus;
}
return true;
}
}
// NOTE: Do not hold the lock when waiting for the thread to ensure
// it can update mIsRunning and mExitStatus properly in thread_main
// without blocking.
void *retval;
if (pthread_join(mThread, &retval)) {
return false;
}
if (exitStatus) {
*exitStatus = (intptr_t)retval;
}
return true;
}
bool Thread::tryWait(intptr_t *exitStatus) {
ScopedLocker locker(&mLock);
if (!mIsRunning) {
return false;
}
if (exitStatus) {
*exitStatus = mExitStatus;
}
return true;
}
// static
void* Thread::thread_main(void *arg) {
Thread* self = reinterpret_cast<Thread*>(arg);
intptr_t ret = self->main();
pthread_mutex_lock(&self->mLock);
self->mIsRunning = false;
self->mExitStatus = ret;
pthread_mutex_unlock(&self->mLock);
::emugl::ThreadStore::OnThreadExit();
return (void*)ret;
}
} // namespace emugl
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