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
86
87
88
89
90
|
/*
* Copyright (C) 2014 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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WAITABLE_EVENT_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WAITABLE_EVENT_H_
#include <memory>
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace base {
class WaitableEvent;
}; // namespace base
namespace blink {
// DEPRECATED, use base::WaitableEvent instead of blink::WaitableEvent.
//
// Provides a thread synchronization that can be used to allow one thread to
// wait until another thread to finish some work.
// TODO(crbug.com/796799): Remove this class in favor of base::WaitableEvent.
class PLATFORM_EXPORT WaitableEvent {
public:
// If ResetPolicy::Manual is specified on creation, to set the event state
// to non-signaled, a consumer must call reset(). Otherwise, the system
// automatically resets the event state to non-signaled after a single
// waiting thread has been released.
enum class ResetPolicy { kAuto, kManual };
// Specify the initial state on creation.
enum class InitialState { kNonSignaled, kSignaled };
explicit WaitableEvent(ResetPolicy = ResetPolicy::kAuto,
InitialState = InitialState::kNonSignaled);
~WaitableEvent();
// Puts the event in the un-signaled state.
void Reset();
// Waits indefinitely for the event to be signaled.
void Wait();
// Puts the event in the signaled state. Causing any thread blocked on Wait
// to be woken up. The event state is reset to non-signaled after
// a waiting thread has been released.
void Signal();
// Waits on multiple events and returns the index of the object that
// has been signaled. Any event objects given to this method must
// not deleted while this wait is happening.
static size_t WaitMultiple(const WTF::Vector<WaitableEvent*>& events);
private:
WaitableEvent(const WaitableEvent&) = delete;
void operator=(const WaitableEvent&) = delete;
std::unique_ptr<base::WaitableEvent> impl_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WAITABLE_EVENT_H_
|
