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1 | /***************************************************************************** |
2 | * Copyright (C) 2013 x265 project | |
3 | * | |
4 | * Authors: Steve Borho <steve@borho.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA. | |
19 | * | |
20 | * This program is also available under a commercial proprietary license. | |
21 | * For more information, contact us at license @ x265.com | |
22 | *****************************************************************************/ | |
23 | ||
24 | #include "threading.h" | |
25 | ||
26 | #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) // _WIN32_WINNT_VISTA | |
27 | ||
28 | namespace x265 { | |
29 | /* Mimic CONDITION_VARIABLE functions only supported on Vista+ */ | |
30 | ||
31 | int WINAPI cond_init(ConditionVariable *cond) | |
32 | { // InitializeConditionVariable | |
33 | cond->semaphore = CreateSemaphore(NULL, 0, 0x7fffffff, NULL); | |
34 | if (!cond->semaphore) | |
35 | return -1; | |
36 | cond->waitersDone = CreateEvent(NULL, FALSE, FALSE, NULL); | |
37 | if (!cond->waitersDone) | |
38 | return -1; | |
39 | ||
40 | InitializeCriticalSection(&cond->waiterCountMutex); | |
41 | InitializeCriticalSection(&cond->broadcastMutex); | |
42 | cond->waiterCount = 0; | |
43 | cond->bIsBroadcast = false; | |
44 | ||
45 | return 0; | |
46 | } | |
47 | ||
48 | void WINAPI cond_broadcast(ConditionVariable *cond) | |
49 | { // WakeAllConditionVariable | |
50 | EnterCriticalSection(&cond->broadcastMutex); | |
51 | EnterCriticalSection(&cond->waiterCountMutex); | |
52 | int haveWaiter = 0; | |
53 | ||
54 | if (cond->waiterCount) | |
55 | { | |
56 | cond->bIsBroadcast = 1; | |
57 | haveWaiter = 1; | |
58 | } | |
59 | ||
60 | if (haveWaiter) | |
61 | { | |
62 | ReleaseSemaphore(cond->semaphore, cond->waiterCount, NULL); | |
63 | LeaveCriticalSection(&cond->waiterCountMutex); | |
64 | WaitForSingleObject(cond->waitersDone, INFINITE); | |
65 | cond->bIsBroadcast = 0; | |
66 | } | |
67 | else | |
68 | LeaveCriticalSection(&cond->waiterCountMutex); | |
69 | ||
70 | LeaveCriticalSection(&cond->broadcastMutex); | |
71 | } | |
72 | ||
73 | void WINAPI cond_signal(ConditionVariable *cond) | |
74 | { // WakeConditionVariable | |
75 | EnterCriticalSection(&cond->broadcastMutex); | |
76 | EnterCriticalSection(&cond->waiterCountMutex); | |
77 | int haveWaiter = cond->waiterCount; | |
78 | LeaveCriticalSection(&cond->waiterCountMutex); | |
79 | ||
80 | if (haveWaiter) | |
81 | { | |
82 | ReleaseSemaphore(cond->semaphore, 1, NULL); | |
83 | WaitForSingleObject(cond->waitersDone, INFINITE); | |
84 | } | |
85 | ||
86 | LeaveCriticalSection(&cond->broadcastMutex); | |
87 | } | |
88 | ||
89 | BOOL WINAPI cond_wait(ConditionVariable *cond, CRITICAL_SECTION *mutex, DWORD wait) | |
90 | { // SleepConditionVariableCS | |
91 | EnterCriticalSection(&cond->broadcastMutex); | |
92 | EnterCriticalSection(&cond->waiterCountMutex); | |
93 | cond->waiterCount++; | |
94 | LeaveCriticalSection(&cond->waiterCountMutex); | |
95 | LeaveCriticalSection(&cond->broadcastMutex); | |
96 | ||
97 | // unlock the external mutex | |
98 | LeaveCriticalSection(mutex); | |
99 | BOOL ret = WaitForSingleObject(cond->semaphore, wait); | |
100 | ||
101 | EnterCriticalSection(&cond->waiterCountMutex); | |
102 | cond->waiterCount--; | |
103 | int last_waiter = !cond->waiterCount || !cond->bIsBroadcast; | |
104 | LeaveCriticalSection(&cond->waiterCountMutex); | |
105 | ||
106 | if (last_waiter) | |
107 | SetEvent(cond->waitersDone); | |
108 | ||
109 | // lock the external mutex | |
110 | EnterCriticalSection(mutex); | |
111 | ||
112 | // returns false on timeout or error | |
113 | return ret; | |
114 | } | |
115 | ||
116 | /* Native CONDITION_VARIABLE instances are not freed, so this is a special case */ | |
117 | void cond_destroy(ConditionVariable *cond) | |
118 | { | |
119 | CloseHandle(cond->semaphore); | |
120 | CloseHandle(cond->waitersDone); | |
121 | DeleteCriticalSection(&cond->broadcastMutex); | |
122 | DeleteCriticalSection(&cond->waiterCountMutex); | |
123 | } | |
124 | } // namespace x265 | |
125 | ||
126 | #elif defined(_MSC_VER) | |
127 | ||
128 | namespace { int _avoid_linker_warnings = 0; } | |
129 | ||
130 | #endif // _WIN32_WINNT <= _WIN32_WINNT_WINXP |