blob: 6f18e1a651df9e0443d00f1a6f3ba9ae9461e5c9 (
plain)
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
|
/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkCondVar_DEFINED
#define SkCondVar_DEFINED
/**
* Import any thread model setting from configuration files.
*/
#include "SkTypes.h"
#ifdef SK_USE_POSIX_THREADS
#include <pthread.h>
#elif defined(SK_BUILD_FOR_WIN32)
#include <windows.h>
#else
/**
* Warn if the implementation of this class is empty, i.e. thread safety is not working.
*/
#warning "Thread safety class SkCondVar has no implementation!"
#endif
/**
* Condition variable for blocking access to shared data from other threads and
* controlling which threads are awake.
*
* Currently only supported on platforms with posix threads and Windows Vista and
* above.
*/
class SkCondVar {
public:
SkCondVar();
~SkCondVar();
/**
* Lock a mutex. Must be done before calling the other functions on this object.
*/
void lock();
/**
* Unlock the mutex.
*/
void unlock();
/**
* Pause the calling thread. Will be awoken when signal() or broadcast() is called.
* Must be called while lock() is held (but gives it up while waiting). Once awoken,
* the calling thread will hold the lock once again.
*/
void wait();
/**
* Wake one thread waiting on this condition. Must be called while lock()
* is held.
*/
void signal();
/**
* Wake all threads waiting on this condition. Must be called while lock()
* is held.
*/
void broadcast();
private:
#ifdef SK_USE_POSIX_THREADS
pthread_mutex_t fMutex;
pthread_cond_t fCond;
#elif defined(SK_BUILD_FOR_WIN32)
CRITICAL_SECTION fCriticalSection;
CONDITION_VARIABLE fCondition;
#endif
};
#endif
|
