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/*
* Copyright 2004 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/base/worker.h"
#include "webrtc/base/common.h"
#include "webrtc/base/logging.h"
#include "webrtc/base/thread.h"
namespace rtc {
enum {
MSG_HAVEWORK = 0,
};
Worker::Worker() : worker_thread_(NULL) {}
Worker::~Worker() {
// We need to already be stopped before being destroyed. We cannot call
// StopWork() from here because the subclass's data has already been
// destructed, so OnStop() cannot be called.
ASSERT(!worker_thread_);
}
bool Worker::StartWork() {
rtc::Thread *me = rtc::Thread::Current();
if (worker_thread_) {
if (worker_thread_ == me) {
// Already working on this thread, so nothing to do.
return true;
} else {
LOG(LS_ERROR) << "Automatically switching threads is not supported";
ASSERT(false);
return false;
}
}
worker_thread_ = me;
OnStart();
return true;
}
bool Worker::StopWork() {
if (!worker_thread_) {
// Already not working, so nothing to do.
return true;
} else if (worker_thread_ != rtc::Thread::Current()) {
LOG(LS_ERROR) << "Stopping from a different thread is not supported";
ASSERT(false);
return false;
}
OnStop();
worker_thread_->Clear(this, MSG_HAVEWORK);
worker_thread_ = NULL;
return true;
}
void Worker::HaveWork() {
ASSERT(worker_thread_ != NULL);
worker_thread_->Post(this, MSG_HAVEWORK);
}
void Worker::OnMessage(rtc::Message *msg) {
ASSERT(msg->message_id == MSG_HAVEWORK);
ASSERT(worker_thread_ == rtc::Thread::Current());
OnHaveWork();
}
} // namespace rtc
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