OLD | NEW |
| (Empty) |
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 /** | |
12 * Import any thread model setting from configuration files. | |
13 */ | |
14 #include "SkTypes.h" | |
15 | |
16 #ifdef SK_USE_POSIX_THREADS | |
17 #include <pthread.h> | |
18 #elif defined(SK_BUILD_FOR_WIN32) | |
19 #include <windows.h> | |
20 #else | |
21 /** | |
22 * Warn if the implementation of this class is empty, i.e. thread safety is not
working. | |
23 */ | |
24 #warning "Thread safety class SkCondVar has no implementation!" | |
25 #endif | |
26 | |
27 /** | |
28 * Condition variable for blocking access to shared data from other threads and | |
29 * controlling which threads are awake. | |
30 * | |
31 * Currently only supported on platforms with posix threads and Windows Vista an
d | |
32 * above. | |
33 */ | |
34 class SkCondVar { | |
35 public: | |
36 SkCondVar(); | |
37 ~SkCondVar(); | |
38 | |
39 /** | |
40 * Lock a mutex. Must be done before calling the other functions on this obj
ect. | |
41 */ | |
42 void lock(); | |
43 | |
44 /** | |
45 * Unlock the mutex. | |
46 */ | |
47 void unlock(); | |
48 | |
49 /** | |
50 * Pause the calling thread. Will be awoken when signal() or broadcast() is
called. | |
51 * Must be called while lock() is held (but gives it up while waiting). Once
awoken, | |
52 * the calling thread will hold the lock once again. | |
53 */ | |
54 void wait(); | |
55 | |
56 /** | |
57 * Wake one thread waiting on this condition. Must be called while lock() | |
58 * is held. | |
59 */ | |
60 void signal(); | |
61 | |
62 /** | |
63 * Wake all threads waiting on this condition. Must be called while lock() | |
64 * is held. | |
65 */ | |
66 void broadcast(); | |
67 | |
68 private: | |
69 #ifdef SK_USE_POSIX_THREADS | |
70 pthread_mutex_t fMutex; | |
71 pthread_cond_t fCond; | |
72 #elif defined(SK_BUILD_FOR_WIN32) | |
73 CRITICAL_SECTION fCriticalSection; | |
74 CONDITION_VARIABLE fCondition; | |
75 #endif | |
76 }; | |
77 | |
78 #endif | |
OLD | NEW |