1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "base/waitable_event.h"
#include <windows.h>
#include "base/logging.h"
#include "base/time.h"
namespace base {
WaitableEvent::WaitableEvent(bool manual_reset, bool signaled)
: event_(CreateEvent(NULL, manual_reset, signaled, NULL)) {
// We're probably going to crash anyways if this is ever NULL, so we might as
// well make our stack reports more informative by crashing here.
CHECK(event_);
}
WaitableEvent::~WaitableEvent() {
CloseHandle(event_);
}
void WaitableEvent::Reset() {
ResetEvent(event_);
}
void WaitableEvent::Signal() {
SetEvent(event_);
}
bool WaitableEvent::IsSignaled() {
return TimedWait(TimeDelta::FromMilliseconds(0));
}
bool WaitableEvent::Wait() {
DWORD result = WaitForSingleObject(event_, INFINITE);
// It is most unexpected that this should ever fail. Help consumers learn
// about it if it should ever fail.
DCHECK(result == WAIT_OBJECT_0) << "WaitForSingleObject failed";
return result == WAIT_OBJECT_0;
}
bool WaitableEvent::TimedWait(const TimeDelta& max_time) {
int32 timeout = static_cast<int32>(max_time.InMilliseconds());
DWORD result = WaitForSingleObject(event_, timeout);
switch (result) {
case WAIT_OBJECT_0:
return true;
case WAIT_TIMEOUT:
return false;
}
// It is most unexpected that this should ever fail. Help consumers learn
// about it if it should ever fail.
NOTREACHED() << "WaitForSingleObject failed";
return false;
}
} // namespace base
|
