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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "base/run_loop.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "base/tracked_objects.h" | |
| 9 | |
| 10 #if defined(OS_WIN) | |
| 11 #include "base/message_loop/message_pump_dispatcher.h" | |
| 12 #endif | |
| 13 | |
| 14 namespace base { | |
| 15 | |
| 16 RunLoop::RunLoop() | |
| 17 : loop_(MessageLoop::current()), | |
| 18 previous_run_loop_(NULL), | |
| 19 run_depth_(0), | |
| 20 run_called_(false), | |
| 21 quit_called_(false), | |
| 22 running_(false), | |
| 23 quit_when_idle_received_(false), | |
| 24 weak_factory_(this) { | |
| 25 #if defined(OS_WIN) | |
| 26 dispatcher_ = NULL; | |
| 27 #endif | |
| 28 } | |
| 29 | |
| 30 #if defined(OS_WIN) | |
| 31 RunLoop::RunLoop(MessagePumpDispatcher* dispatcher) | |
| 32 : loop_(MessageLoop::current()), | |
| 33 previous_run_loop_(NULL), | |
| 34 dispatcher_(dispatcher), | |
| 35 run_depth_(0), | |
| 36 run_called_(false), | |
| 37 quit_called_(false), | |
| 38 running_(false), | |
| 39 quit_when_idle_received_(false), | |
| 40 weak_factory_(this) { | |
| 41 } | |
| 42 #endif | |
| 43 | |
| 44 RunLoop::~RunLoop() { | |
| 45 } | |
| 46 | |
| 47 void RunLoop::Run() { | |
| 48 if (!BeforeRun()) | |
| 49 return; | |
| 50 | |
| 51 // Use task stopwatch to exclude the loop run time from the current task, if | |
| 52 // any. | |
| 53 tracked_objects::TaskStopwatch stopwatch; | |
| 54 stopwatch.Start(); | |
| 55 loop_->RunHandler(); | |
| 56 stopwatch.Stop(); | |
| 57 | |
| 58 AfterRun(); | |
| 59 } | |
| 60 | |
| 61 void RunLoop::RunUntilIdle() { | |
| 62 quit_when_idle_received_ = true; | |
| 63 Run(); | |
| 64 } | |
| 65 | |
| 66 void RunLoop::Quit() { | |
| 67 quit_called_ = true; | |
| 68 if (running_ && loop_->run_loop_ == this) { | |
| 69 // This is the inner-most RunLoop, so quit now. | |
| 70 loop_->QuitNow(); | |
| 71 } | |
| 72 } | |
| 73 | |
| 74 base::Closure RunLoop::QuitClosure() { | |
| 75 return base::Bind(&RunLoop::Quit, weak_factory_.GetWeakPtr()); | |
| 76 } | |
| 77 | |
| 78 bool RunLoop::BeforeRun() { | |
| 79 DCHECK(!run_called_); | |
| 80 run_called_ = true; | |
| 81 | |
| 82 // Allow Quit to be called before Run. | |
| 83 if (quit_called_) | |
| 84 return false; | |
| 85 | |
| 86 // Push RunLoop stack: | |
| 87 previous_run_loop_ = loop_->run_loop_; | |
| 88 run_depth_ = previous_run_loop_? previous_run_loop_->run_depth_ + 1 : 1; | |
| 89 loop_->run_loop_ = this; | |
| 90 | |
| 91 running_ = true; | |
| 92 return true; | |
| 93 } | |
| 94 | |
| 95 void RunLoop::AfterRun() { | |
| 96 running_ = false; | |
| 97 | |
| 98 // Pop RunLoop stack: | |
| 99 loop_->run_loop_ = previous_run_loop_; | |
| 100 | |
| 101 // Execute deferred QuitNow, if any: | |
| 102 if (previous_run_loop_ && previous_run_loop_->quit_called_) | |
| 103 loop_->QuitNow(); | |
| 104 } | |
| 105 | |
| 106 } // namespace base | |
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