OLD | NEW |
(Empty) | |
| 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 |
OLD | NEW |