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| 1 /* | |
| 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 #include "webrtc/base/signalthread.h" | |
| 12 | |
| 13 #include "webrtc/base/checks.h" | |
| 14 | |
| 15 namespace rtc { | |
| 16 | |
| 17 /////////////////////////////////////////////////////////////////////////////// | |
| 18 // SignalThread | |
| 19 /////////////////////////////////////////////////////////////////////////////// | |
| 20 | |
| 21 SignalThread::SignalThread(bool use_socket_server) | |
| 22 : main_(Thread::Current()), | |
| 23 worker_(this, use_socket_server), | |
| 24 state_(kInit), | |
| 25 refcount_(1) { | |
| 26 main_->SignalQueueDestroyed.connect(this, | |
| 27 &SignalThread::OnMainThreadDestroyed); | |
| 28 worker_.SetName("SignalThread", this); | |
| 29 } | |
| 30 | |
| 31 SignalThread::~SignalThread() { | |
| 32 RTC_DCHECK(refcount_ == 0); | |
| 33 } | |
| 34 | |
| 35 bool SignalThread::SetName(const std::string& name, const void* obj) { | |
| 36 EnterExit ee(this); | |
| 37 RTC_DCHECK(main_->IsCurrent()); | |
| 38 RTC_DCHECK(kInit == state_); | |
| 39 return worker_.SetName(name, obj); | |
| 40 } | |
| 41 | |
| 42 void SignalThread::Start() { | |
| 43 EnterExit ee(this); | |
| 44 RTC_DCHECK(main_->IsCurrent()); | |
| 45 if (kInit == state_ || kComplete == state_) { | |
| 46 state_ = kRunning; | |
| 47 OnWorkStart(); | |
| 48 worker_.Start(); | |
| 49 } else { | |
| 50 RTC_NOTREACHED(); | |
| 51 } | |
| 52 } | |
| 53 | |
| 54 void SignalThread::Destroy(bool wait) { | |
| 55 EnterExit ee(this); | |
| 56 RTC_DCHECK(main_->IsCurrent()); | |
| 57 if ((kInit == state_) || (kComplete == state_)) { | |
| 58 refcount_--; | |
| 59 } else if (kRunning == state_ || kReleasing == state_) { | |
| 60 state_ = kStopping; | |
| 61 // OnWorkStop() must follow Quit(), so that when the thread wakes up due to | |
| 62 // OWS(), ContinueWork() will return false. | |
| 63 worker_.Quit(); | |
| 64 OnWorkStop(); | |
| 65 if (wait) { | |
| 66 // Release the thread's lock so that it can return from ::Run. | |
| 67 cs_.Leave(); | |
| 68 worker_.Stop(); | |
| 69 cs_.Enter(); | |
| 70 refcount_--; | |
| 71 } | |
| 72 } else { | |
| 73 RTC_NOTREACHED(); | |
| 74 } | |
| 75 } | |
| 76 | |
| 77 void SignalThread::Release() { | |
| 78 EnterExit ee(this); | |
| 79 RTC_DCHECK(main_->IsCurrent()); | |
| 80 if (kComplete == state_) { | |
| 81 refcount_--; | |
| 82 } else if (kRunning == state_) { | |
| 83 state_ = kReleasing; | |
| 84 } else { | |
| 85 // if (kInit == state_) use Destroy() | |
| 86 RTC_NOTREACHED(); | |
| 87 } | |
| 88 } | |
| 89 | |
| 90 bool SignalThread::ContinueWork() { | |
| 91 EnterExit ee(this); | |
| 92 RTC_DCHECK(worker_.IsCurrent()); | |
| 93 return worker_.ProcessMessages(0); | |
| 94 } | |
| 95 | |
| 96 void SignalThread::OnMessage(Message *msg) { | |
| 97 EnterExit ee(this); | |
| 98 if (ST_MSG_WORKER_DONE == msg->message_id) { | |
| 99 RTC_DCHECK(main_->IsCurrent()); | |
| 100 OnWorkDone(); | |
| 101 bool do_delete = false; | |
| 102 if (kRunning == state_) { | |
| 103 state_ = kComplete; | |
| 104 } else { | |
| 105 do_delete = true; | |
| 106 } | |
| 107 if (kStopping != state_) { | |
| 108 // Before signaling that the work is done, make sure that the worker | |
| 109 // thread actually is done. We got here because DoWork() finished and | |
| 110 // Run() posted the ST_MSG_WORKER_DONE message. This means the worker | |
| 111 // thread is about to go away anyway, but sometimes it doesn't actually | |
| 112 // finish before SignalWorkDone is processed, and for a reusable | |
| 113 // SignalThread this makes an assert in thread.cc fire. | |
| 114 // | |
| 115 // Calling Stop() on the worker ensures that the OS thread that underlies | |
| 116 // the worker will finish, and will be set to null, enabling us to call | |
| 117 // Start() again. | |
| 118 worker_.Stop(); | |
| 119 SignalWorkDone(this); | |
| 120 } | |
| 121 if (do_delete) { | |
| 122 refcount_--; | |
| 123 } | |
| 124 } | |
| 125 } | |
| 126 | |
| 127 SignalThread::Worker::~Worker() { | |
| 128 Stop(); | |
| 129 } | |
| 130 | |
| 131 void SignalThread::Worker::Run() { | |
| 132 parent_->Run(); | |
| 133 } | |
| 134 | |
| 135 void SignalThread::Run() { | |
| 136 DoWork(); | |
| 137 { | |
| 138 EnterExit ee(this); | |
| 139 if (main_) { | |
| 140 main_->Post(RTC_FROM_HERE, this, ST_MSG_WORKER_DONE); | |
| 141 } | |
| 142 } | |
| 143 } | |
| 144 | |
| 145 void SignalThread::OnMainThreadDestroyed() { | |
| 146 EnterExit ee(this); | |
| 147 main_ = nullptr; | |
| 148 } | |
| 149 | |
| 150 bool SignalThread::Worker::IsProcessingMessages() { | |
| 151 return false; | |
| 152 } | |
| 153 | |
| 154 } // namespace rtc | |
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Chromium Code Reviews
Issue 2877023002:
Move webrtc/{base => rtc_base} (Closed)
