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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/system_wrappers/source/thread_win.h"
#include <process.h>
#include <stdio.h>
#include <windows.h>
#include "webrtc/base/checks.h"
#include "webrtc/base/platform_thread.h"
#include "webrtc/system_wrappers/include/trace.h"
namespace webrtc {
namespace {
void CALLBACK RaiseFlag(ULONG_PTR param) {
*reinterpret_cast<bool*>(param) = true;
}
}
ThreadWindows::ThreadWindows(ThreadRunFunction func, void* obj,
const char* thread_name)
: run_function_(func),
obj_(obj),
stop_(false),
thread_(NULL),
name_(thread_name ? thread_name : "webrtc") {
RTC_DCHECK(func);
}
ThreadWindows::~ThreadWindows() {
RTC_DCHECK(main_thread_.CalledOnValidThread());
RTC_DCHECK(!thread_);
}
// static
uint32_t ThreadWrapper::GetThreadId() {
return GetCurrentThreadId();
}
// static
DWORD WINAPI ThreadWindows::StartThread(void* param) {
static_cast<ThreadWindows*>(param)->Run();
return 0;
}
bool ThreadWindows::Start() {
RTC_DCHECK(main_thread_.CalledOnValidThread());
RTC_DCHECK(!thread_);
stop_ = false;
// See bug 2902 for background on STACK_SIZE_PARAM_IS_A_RESERVATION.
// Set the reserved stack stack size to 1M, which is the default on Windows
// and Linux.
DWORD thread_id;
thread_ = ::CreateThread(NULL, 1024 * 1024, &StartThread, this,
STACK_SIZE_PARAM_IS_A_RESERVATION, &thread_id);
if (!thread_ ) {
RTC_DCHECK(false) << "CreateThread failed";
return false;
}
return true;
}
bool ThreadWindows::Stop() {
RTC_DCHECK(main_thread_.CalledOnValidThread());
if (thread_) {
// Set stop_ to |true| on the worker thread.
QueueUserAPC(&RaiseFlag, thread_, reinterpret_cast<ULONG_PTR>(&stop_));
WaitForSingleObject(thread_, INFINITE);
CloseHandle(thread_);
thread_ = nullptr;
}
return true;
}
bool ThreadWindows::SetPriority(ThreadPriority priority) {
RTC_DCHECK(main_thread_.CalledOnValidThread());
return thread_ && SetThreadPriority(thread_, priority);
}
void ThreadWindows::Run() {
if (!name_.empty())
rtc::SetCurrentThreadName(name_.c_str());
do {
// The interface contract of Start/Stop is that for a successfull call to
// Start, there should be at least one call to the run function. So we
// call the function before checking |stop_|.
if (!run_function_(obj_))
break;
// Alertable sleep to permit RaiseFlag to run and update |stop_|.
SleepEx(0, true);
} while (!stop_);
}
} // namespace webrtc
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