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| 1 // Copyright (c) 2006-2008 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/message_loop/message_pump_default.h" | |
| 6 | |
| 7 #include <algorithm> | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 #include "base/threading/thread_restrictions.h" | |
| 11 | |
| 12 #if defined(OS_MACOSX) | |
| 13 #include "base/mac/scoped_nsautorelease_pool.h" | |
| 14 #endif | |
| 15 | |
| 16 namespace base { | |
| 17 | |
| 18 MessagePumpDefault::MessagePumpDefault() | |
| 19 : keep_running_(true), | |
| 20 event_(false, false) { | |
| 21 } | |
| 22 | |
| 23 MessagePumpDefault::~MessagePumpDefault() { | |
| 24 } | |
| 25 | |
| 26 void MessagePumpDefault::Run(Delegate* delegate) { | |
| 27 DCHECK(keep_running_) << "Quit must have been called outside of Run!"; | |
| 28 | |
| 29 for (;;) { | |
| 30 #if defined(OS_MACOSX) | |
| 31 mac::ScopedNSAutoreleasePool autorelease_pool; | |
| 32 #endif | |
| 33 | |
| 34 bool did_work = delegate->DoWork(); | |
| 35 if (!keep_running_) | |
| 36 break; | |
| 37 | |
| 38 did_work |= delegate->DoDelayedWork(&delayed_work_time_); | |
| 39 if (!keep_running_) | |
| 40 break; | |
| 41 | |
| 42 if (did_work) | |
| 43 continue; | |
| 44 | |
| 45 did_work = delegate->DoIdleWork(); | |
| 46 if (!keep_running_) | |
| 47 break; | |
| 48 | |
| 49 if (did_work) | |
| 50 continue; | |
| 51 | |
| 52 ThreadRestrictions::ScopedAllowWait allow_wait; | |
| 53 if (delayed_work_time_.is_null()) { | |
| 54 event_.Wait(); | |
| 55 } else { | |
| 56 TimeDelta delay = delayed_work_time_ - TimeTicks::Now(); | |
| 57 #if defined(OS_WIN) | |
| 58 // If the delay is greater than zero and under 1 ms we need to round up to | |
| 59 // 1 ms or else we will end up spinning until it counts down to zero | |
| 60 // because sub-ms waits aren't supported on Windows. | |
| 61 if (delay > TimeDelta()) | |
| 62 delay = std::max(delay, TimeDelta::FromMilliseconds(1)); | |
| 63 #endif | |
| 64 if (delay > TimeDelta()) { | |
| 65 event_.TimedWait(delay); | |
| 66 } else { | |
| 67 // It looks like delayed_work_time_ indicates a time in the past, so we | |
| 68 // need to call DoDelayedWork now. | |
| 69 delayed_work_time_ = TimeTicks(); | |
| 70 } | |
| 71 } | |
| 72 // Since event_ is auto-reset, we don't need to do anything special here | |
| 73 // other than service each delegate method. | |
| 74 } | |
| 75 | |
| 76 keep_running_ = true; | |
| 77 } | |
| 78 | |
| 79 void MessagePumpDefault::Quit() { | |
| 80 keep_running_ = false; | |
| 81 } | |
| 82 | |
| 83 void MessagePumpDefault::ScheduleWork() { | |
| 84 // Since this can be called on any thread, we need to ensure that our Run | |
| 85 // loop wakes up. | |
| 86 event_.Signal(); | |
| 87 } | |
| 88 | |
| 89 void MessagePumpDefault::ScheduleDelayedWork( | |
| 90 const TimeTicks& delayed_work_time) { | |
| 91 // We know that we can't be blocked on Wait right now since this method can | |
| 92 // only be called on the same thread as Run, so we only need to update our | |
| 93 // record of how long to sleep when we do sleep. | |
| 94 delayed_work_time_ = delayed_work_time; | |
| 95 } | |
| 96 | |
| 97 } // namespace base | |
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