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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 "base/Thread.h"
#include <assert.h>
namespace android {
namespace base {
Thread::Thread(ThreadFlags flags, int stackSize)
: mStackSize(stackSize), mFlags(flags) {}
Thread::~Thread() {
if (mThread) {
assert(!mStarted || mFinished);
CloseHandle(mThread);
}
}
bool Thread::start() {
if (mStarted) {
return false;
}
bool ret = true;
mStarted = true;
DWORD threadId = 0;
mThread = CreateThread(NULL, mStackSize, &Thread::thread_main, this, 0,
&threadId);
if (!mThread) {
// don't reset mStarted: we're artifically limiting the user's
// ability to retry the failed starts here.
ret = false;
mFinished = true;
}
return ret;
}
bool Thread::wait(intptr_t* exitStatus) {
if (!mStarted || (mFlags & ThreadFlags::Detach) != ThreadFlags::NoFlags) {
return false;
}
// NOTE: Do not hold lock during wait to allow thread_main to
// properly update mIsRunning and mFinished on thread exit.
if (WaitForSingleObject(mThread, INFINITE) == WAIT_FAILED) {
return false;
}
if (exitStatus) {
*exitStatus = mExitStatus;
}
return true;
}
bool Thread::tryWait(intptr_t* exitStatus) {
if (!mStarted || (mFlags & ThreadFlags::Detach) != ThreadFlags::NoFlags) {
return false;
}
AutoLock locker(mLock);
if (!mFinished || WaitForSingleObject(mThread, 0) != WAIT_OBJECT_0) {
return false;
}
if (exitStatus) {
*exitStatus = mExitStatus;
}
return true;
}
// static
DWORD WINAPI Thread::thread_main(void* arg) {
{
// no need to call maskAllSignals() here: we know
// that on Windows it's a noop
Thread* self = reinterpret_cast<Thread*>(arg);
auto ret = self->main();
{
AutoLock lock(self->mLock);
self->mFinished = true;
self->mExitStatus = ret;
}
self->onExit();
// |self| is not valid beyond this point
}
// This return value is ignored.
return 0;
}
// static
void Thread::maskAllSignals() {
// no such thing as signal in Windows
}
// static
void Thread::sleepMs(unsigned n) {
::Sleep(n);
}
// static
void Thread::sleepUs(unsigned n) {
// Hehe
::Sleep(n / 1000);
}
// static
void Thread::yield() {
if (!::SwitchToThread()) {
::Sleep(0);
}
}
unsigned long getCurrentThreadId() {
return static_cast<unsigned long>(GetCurrentThreadId());
}
static unsigned long sUiThreadId = 0;
void setUiThreadId(unsigned long id) {
sUiThreadId = id;
}
bool isRunningInUiThread() {
if (!sUiThreadId) return false;
return sUiThreadId == getCurrentThreadId();
}
} // namespace base
} // namespace android
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