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
|
/*
* Copyright (C) 2012 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 BlockingResponseMap_h
#define BlockingResponseMap_h
#include <wtf/HashMap.h>
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/ThreadingPrimitives.h>
template<typename T>
class BlockingResponseMap {
WTF_MAKE_NONCOPYABLE(BlockingResponseMap);
public:
BlockingResponseMap() : m_canceled(false) { }
~BlockingResponseMap() { ASSERT(m_responses.isEmpty()); }
PassOwnPtr<T> waitForResponse(uint64_t requestID)
{
while (true) {
MutexLocker locker(m_mutex);
if (m_canceled)
return nullptr;
if (OwnPtr<T> response = m_responses.take(requestID))
return response.release();
m_condition.wait(m_mutex);
}
return nullptr;
}
void didReceiveResponse(uint64_t requestID, PassOwnPtr<T> response)
{
MutexLocker locker(m_mutex);
ASSERT(!m_responses.contains(requestID));
m_responses.set(requestID, response);
// FIXME: Waking up all threads is quite inefficient.
m_condition.broadcast();
}
void cancel()
{
m_canceled = true;
// FIXME: Waking up all threads is quite inefficient.
m_condition.broadcast();
}
private:
Mutex m_mutex;
ThreadCondition m_condition;
HashMap<uint64_t, OwnPtr<T> > m_responses;
bool m_canceled;
};
#endif // BlockingResponseMap_h
|
