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comparison: ipc/chromium/src/base/waitable_event_win.cc
ipc/chromium/src/base/waitable_event_win.cc
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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/waitable_event.h" | |
| 6 | |
| 7 #include <math.h> | |
| 8 #include <windows.h> | |
| 9 | |
| 10 #include "base/logging.h" | |
| 11 #include "base/time.h" | |
| 12 | |
| 13 namespace base { | |
| 14 | |
| 15 WaitableEvent::WaitableEvent(bool manual_reset, bool signaled) | |
| 16 : handle_(CreateEvent(NULL, manual_reset, signaled, NULL)) { | |
| 17 // We're probably going to crash anyways if this is ever NULL, so we might as | |
| 18 // well make our stack reports more informative by crashing here. | |
| 19 CHECK(handle_); | |
| 20 } | |
| 21 | |
| 22 WaitableEvent::WaitableEvent(HANDLE handle) | |
| 23 : handle_(handle) { | |
| 24 CHECK(handle) << "Tried to create WaitableEvent from NULL handle"; | |
| 25 } | |
| 26 | |
| 27 WaitableEvent::~WaitableEvent() { | |
| 28 CloseHandle(handle_); | |
| 29 } | |
| 30 | |
| 31 HANDLE WaitableEvent::Release() { | |
| 32 HANDLE rv = handle_; | |
| 33 handle_ = INVALID_HANDLE_VALUE; | |
| 34 return rv; | |
| 35 } | |
| 36 | |
| 37 void WaitableEvent::Reset() { | |
| 38 ResetEvent(handle_); | |
| 39 } | |
| 40 | |
| 41 void WaitableEvent::Signal() { | |
| 42 SetEvent(handle_); | |
| 43 } | |
| 44 | |
| 45 bool WaitableEvent::IsSignaled() { | |
| 46 return TimedWait(TimeDelta::FromMilliseconds(0)); | |
| 47 } | |
| 48 | |
| 49 bool WaitableEvent::Wait() { | |
| 50 DWORD result = WaitForSingleObject(handle_, INFINITE); | |
| 51 // It is most unexpected that this should ever fail. Help consumers learn | |
| 52 // about it if it should ever fail. | |
| 53 DCHECK(result == WAIT_OBJECT_0) << "WaitForSingleObject failed"; | |
| 54 return result == WAIT_OBJECT_0; | |
| 55 } | |
| 56 | |
| 57 bool WaitableEvent::TimedWait(const TimeDelta& max_time) { | |
| 58 DCHECK(max_time >= TimeDelta::FromMicroseconds(0)); | |
| 59 // Be careful here. TimeDelta has a precision of microseconds, but this API | |
| 60 // is in milliseconds. If there are 5.5ms left, should the delay be 5 or 6? | |
| 61 // It should be 6 to avoid returning too early. | |
| 62 double timeout = ceil(max_time.InMillisecondsF()); | |
| 63 DWORD result = WaitForSingleObject(handle_, static_cast<DWORD>(timeout)); | |
| 64 switch (result) { | |
| 65 case WAIT_OBJECT_0: | |
| 66 return true; | |
| 67 case WAIT_TIMEOUT: | |
| 68 return false; | |
| 69 } | |
| 70 // It is most unexpected that this should ever fail. Help consumers learn | |
| 71 // about it if it should ever fail. | |
| 72 NOTREACHED() << "WaitForSingleObject failed"; | |
| 73 return false; | |
| 74 } | |
| 75 | |
| 76 // static | |
| 77 size_t WaitableEvent::WaitMany(WaitableEvent** events, size_t count) { | |
| 78 HANDLE handles[MAXIMUM_WAIT_OBJECTS]; | |
| 79 CHECK(count <= MAXIMUM_WAIT_OBJECTS) | |
| 80 << "Can only wait on " << MAXIMUM_WAIT_OBJECTS << " with WaitMany"; | |
| 81 | |
| 82 for (size_t i = 0; i < count; ++i) | |
| 83 handles[i] = events[i]->handle(); | |
| 84 | |
| 85 DWORD result = | |
| 86 WaitForMultipleObjects(count, handles, | |
| 87 FALSE, // don't wait for all the objects | |
| 88 INFINITE); // no timeout | |
| 89 if (result < WAIT_OBJECT_0 || result >= WAIT_OBJECT_0 + count) { | |
| 90 NOTREACHED() << "WaitForMultipleObjects failed: " << GetLastError(); | |
| 91 return 0; | |
| 92 } | |
| 93 | |
| 94 return result - WAIT_OBJECT_0; | |
| 95 } | |
| 96 | |
| 97 } // namespace base |
