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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"
namespace emugl {
namespace {
class ScopedLocker {
public:
ScopedLocker(CRITICAL_SECTION* section) : mSection(section) {
EnterCriticalSection(mSection);
}
~ScopedLocker() {
LeaveCriticalSection(mSection);
}
private:
CRITICAL_SECTION* mSection;
};
} // namespace
Thread::Thread() :
mThread(INVALID_HANDLE_VALUE),
mThreadId(0),
mExitStatus(0),
mIsRunning(false) {
InitializeCriticalSection(&mLock);
}
Thread::~Thread() {
if(mThread != INVALID_HANDLE_VALUE) {
CloseHandle(mThread);
}
DeleteCriticalSection(&mLock);
}
bool Thread::start() {
ScopedLocker locker(&mLock);
bool ret = true;
mIsRunning = true;
mThread = CreateThread(NULL, 0, &Thread::thread_main, this, 0, &mThreadId);
if (!mThread) {
ret = false;
mIsRunning = false;
}
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 lock during wait to aloow thread_main to
// properly update mIsRunning and mExitStatus on thread exit.
if (WaitForSingleObject(mThread, INFINITE) == WAIT_FAILED) {
return false;
}
if (exitStatus) {
ScopedLocker locker(&mLock);
*exitStatus = mExitStatus;
}
return true;
}
bool Thread::tryWait(intptr_t* exitStatus) {
ScopedLocker locker(&mLock);
if (!mIsRunning ||
WaitForSingleObject(mThread, 0) != WAIT_OBJECT_0) {
return false;
}
if (exitStatus) {
*exitStatus = mExitStatus;
}
return true;
}
// static
DWORD WINAPI Thread::thread_main(void *arg)
{
Thread* self = reinterpret_cast<Thread*>(arg);
intptr_t ret = self->main();
EnterCriticalSection(&self->mLock);
self->mIsRunning = false;
self->mExitStatus = ret;
LeaveCriticalSection(&self->mLock);
// Ensure all thread-local values are released for this thread.
::emugl::ThreadStore::OnThreadExit();
return static_cast<DWORD>(ret);
}
} // namespace emugl
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