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* Copyright 2004--2009, Google Inc.
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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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* 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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* 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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#include "talk/base/signalthread.h"
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#include "talk/base/common.h"
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////
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SignalThread::SignalThread()
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: main_(Thread::Current()),
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main_->SignalQueueDestroyed.connect(this,
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&SignalThread::OnMainThreadDestroyed);
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worker_.SetName("SignalThread", this);
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SignalThread::~SignalThread() {
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ASSERT(refcount_ == 0);
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bool SignalThread::SetName(const std::string& name, const void* obj) {
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ASSERT(main_->IsCurrent());
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ASSERT(kInit == state_);
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return worker_.SetName(name, obj);
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bool SignalThread::SetPriority(ThreadPriority priority) {
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ASSERT(main_->IsCurrent());
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ASSERT(kInit == state_);
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return worker_.SetPriority(priority);
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void SignalThread::Start() {
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ASSERT(main_->IsCurrent());
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if (kInit == state_ || kComplete == state_) {
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void SignalThread::Destroy(bool wait) {
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ASSERT(main_->IsCurrent());
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if ((kInit == state_) || (kComplete == state_)) {
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} else if (kRunning == state_ || kReleasing == state_) {
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// OnWorkStop() must follow Quit(), so that when the thread wakes up due to
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// OWS(), ContinueWork() will return false.
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// Release the thread's lock so that it can return from ::Run.
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void SignalThread::Release() {
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ASSERT(main_->IsCurrent());
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if (kComplete == state_) {
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} else if (kRunning == state_) {
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// if (kInit == state_) use Destroy()
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bool SignalThread::ContinueWork() {
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ASSERT(worker_.IsCurrent());
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return worker_.ProcessMessages(0);
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void SignalThread::OnMessage(Message *msg) {
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if (ST_MSG_WORKER_DONE == msg->message_id) {
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ASSERT(main_->IsCurrent());
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bool do_delete = false;
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if (kRunning == state_) {
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if (kStopping != state_) {
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// Before signaling that the work is done, make sure that the worker
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// thread actually is done. We got here because DoWork() finished and
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// Run() posted the ST_MSG_WORKER_DONE message. This means the worker
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// thread is about to go away anyway, but sometimes it doesn't actually
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// finish before SignalWorkDone is processed, and for a reusable
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// SignalThread this makes an assert in thread.cc fire.
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// Calling Stop() on the worker ensures that the OS thread that underlies
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// the worker will finish, and will be set to NULL, enabling us to call
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SignalWorkDone(this);
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void SignalThread::Run() {
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main_->Post(this, ST_MSG_WORKER_DONE);
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void SignalThread::OnMainThreadDestroyed() {
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} // namespace talk_base