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1 /* | |
2 * Copyright 2012 Google Inc. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 #ifndef SkCondVar_DEFINED | |
9 #define SkCondVar_DEFINED | |
10 | |
11 #include "SkTypes.h" | |
12 | |
13 #ifdef SK_BUILD_FOR_WIN32 | |
14 #include <windows.h> | |
15 #else | |
16 #include <pthread.h> | |
17 #endif | |
18 | |
19 /** | |
20 * Condition variable for blocking access to shared data from other threads and | |
21 * controlling which threads are awake. | |
22 * | |
23 * Currently only supported on platforms with posix threads and Windows Vista an
d above. | |
24 */ | |
25 class SkCondVar { | |
26 public: | |
27 /** Returns true if it makes sense to create and use SkCondVars. | |
28 * You _MUST_ call this method and it must return true before creating any
SkCondVars. | |
29 */ | |
30 static bool Supported(); | |
31 | |
32 SkCondVar(); | |
33 ~SkCondVar(); | |
34 | |
35 /** | |
36 * Lock a mutex. Must be done before calling the other functions on this obj
ect. | |
37 */ | |
38 void lock(); | |
39 | |
40 /** | |
41 * Unlock the mutex. | |
42 */ | |
43 void unlock(); | |
44 | |
45 /** | |
46 * Pause the calling thread. Will be awoken when signal() or broadcast() is
called. | |
47 * Must be called while lock() is held (but gives it up while waiting). Once
awoken, | |
48 * the calling thread will hold the lock once again. | |
49 */ | |
50 void wait(); | |
51 | |
52 /** | |
53 * Wake one thread waiting on this condition. Must be called while lock() | |
54 * is held. | |
55 */ | |
56 void signal(); | |
57 | |
58 /** | |
59 * Wake all threads waiting on this condition. Must be called while lock() | |
60 * is held. | |
61 */ | |
62 void broadcast(); | |
63 | |
64 private: | |
65 #ifdef SK_BUILD_FOR_WIN32 | |
66 CRITICAL_SECTION fCriticalSection; | |
67 CONDITION_VARIABLE fCondition; | |
68 #else | |
69 pthread_mutex_t fMutex; | |
70 pthread_cond_t fCond; | |
71 #endif | |
72 }; | |
73 | |
74 #endif | |
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