76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
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/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/base/worker.h"
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#include "webrtc/base/common.h"
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#include "webrtc/base/logging.h"
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#include "webrtc/base/thread.h"
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namespace rtc {
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enum {
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MSG_HAVEWORK = 0,
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};
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Worker::Worker() : worker_thread_(NULL) {}
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Worker::~Worker() {
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// We need to already be stopped before being destroyed. We cannot call
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// StopWork() from here because the subclass's data has already been
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// destructed, so OnStop() cannot be called.
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ASSERT(!worker_thread_);
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}
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bool Worker::StartWork() {
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rtc::Thread *me = rtc::Thread::Current();
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if (worker_thread_) {
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if (worker_thread_ == me) {
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// Already working on this thread, so nothing to do.
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return true;
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} else {
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LOG(LS_ERROR) << "Automatically switching threads is not supported";
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ASSERT(false);
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return false;
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}
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}
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worker_thread_ = me;
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OnStart();
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return true;
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}
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bool Worker::StopWork() {
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if (!worker_thread_) {
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// Already not working, so nothing to do.
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return true;
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} else if (worker_thread_ != rtc::Thread::Current()) {
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LOG(LS_ERROR) << "Stopping from a different thread is not supported";
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ASSERT(false);
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return false;
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}
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OnStop();
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worker_thread_->Clear(this, MSG_HAVEWORK);
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worker_thread_ = NULL;
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return true;
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}
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void Worker::HaveWork() {
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ASSERT(worker_thread_ != NULL);
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worker_thread_->Post(RTC_FROM_HERE, this, MSG_HAVEWORK);
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}
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void Worker::OnMessage(rtc::Message *msg) {
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ASSERT(msg->message_id == MSG_HAVEWORK);
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ASSERT(worker_thread_ == rtc::Thread::Current());
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OnHaveWork();
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}
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} // namespace rtc
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