28e2075280
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
/*
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* libjingle
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* Copyright 2004--2010, Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "talk/base/worker.h"
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#include "talk/base/common.h"
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#include "talk/base/logging.h"
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#include "talk/base/thread.h"
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namespace talk_base {
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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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talk_base::Thread *me = talk_base::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_ != talk_base::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(this, MSG_HAVEWORK);
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}
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void Worker::OnMessage(talk_base::Message *msg) {
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ASSERT(msg->message_id == MSG_HAVEWORK);
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ASSERT(worker_thread_ == talk_base::Thread::Current());
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OnHaveWork();
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}
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} // namespace talk_base
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