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2ba45a60 DM |
1 | /* |
2 | * Copyright (C) 2010-2011 x264 project | |
3 | * | |
4 | * Authors: Steven Walters <kemuri9@gmail.com> | |
5 | * Pegasys Inc. <http://www.pegasys-inc.com> | |
6 | * | |
7 | * This file is part of FFmpeg. | |
8 | * | |
9 | * FFmpeg is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * FFmpeg is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with FFmpeg; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | */ | |
23 | ||
24 | /** | |
25 | * @file | |
26 | * w32threads to pthreads wrapper | |
27 | */ | |
28 | ||
29 | #ifndef FFMPEG_COMPAT_W32PTHREADS_H | |
30 | #define FFMPEG_COMPAT_W32PTHREADS_H | |
31 | ||
32 | /* Build up a pthread-like API using underlying Windows API. Have only static | |
33 | * methods so as to not conflict with a potentially linked in pthread-win32 | |
34 | * library. | |
35 | * As most functions here are used without checking return values, | |
36 | * only implement return values as necessary. */ | |
37 | ||
38 | #define WIN32_LEAN_AND_MEAN | |
39 | #include <windows.h> | |
40 | #include <process.h> | |
41 | ||
42 | #include "libavutil/attributes.h" | |
43 | #include "libavutil/common.h" | |
44 | #include "libavutil/internal.h" | |
45 | #include "libavutil/mem.h" | |
46 | ||
47 | typedef struct pthread_t { | |
48 | void *handle; | |
49 | void *(*func)(void* arg); | |
50 | void *arg; | |
51 | void *ret; | |
52 | } pthread_t; | |
53 | ||
54 | /* the conditional variable api for windows 6.0+ uses critical sections and | |
55 | * not mutexes */ | |
56 | typedef CRITICAL_SECTION pthread_mutex_t; | |
57 | ||
f6fa7814 DM |
58 | /* This is the CONDITION_VARIABLE typedef for using Windows' native |
59 | * conditional variables on kernels 6.0+. */ | |
60 | #if HAVE_CONDITION_VARIABLE_PTR | |
61 | typedef CONDITION_VARIABLE pthread_cond_t; | |
62 | #else | |
2ba45a60 | 63 | typedef struct pthread_cond_t { |
f6fa7814 | 64 | void *Ptr; |
2ba45a60 | 65 | } pthread_cond_t; |
f6fa7814 | 66 | #endif |
2ba45a60 | 67 | |
f6fa7814 | 68 | #if _WIN32_WINNT >= 0x0600 |
2ba45a60 DM |
69 | #define InitializeCriticalSection(x) InitializeCriticalSectionEx(x, 0, 0) |
70 | #define WaitForSingleObject(a, b) WaitForSingleObjectEx(a, b, FALSE) | |
71 | #endif | |
72 | ||
73 | static av_unused unsigned __stdcall attribute_align_arg win32thread_worker(void *arg) | |
74 | { | |
75 | pthread_t *h = arg; | |
76 | h->ret = h->func(h->arg); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static av_unused int pthread_create(pthread_t *thread, const void *unused_attr, | |
81 | void *(*start_routine)(void*), void *arg) | |
82 | { | |
83 | thread->func = start_routine; | |
84 | thread->arg = arg; | |
85 | thread->handle = (void*)_beginthreadex(NULL, 0, win32thread_worker, thread, | |
86 | 0, NULL); | |
87 | return !thread->handle; | |
88 | } | |
89 | ||
90 | static av_unused void pthread_join(pthread_t thread, void **value_ptr) | |
91 | { | |
92 | DWORD ret = WaitForSingleObject(thread.handle, INFINITE); | |
93 | if (ret != WAIT_OBJECT_0) | |
94 | return; | |
95 | if (value_ptr) | |
96 | *value_ptr = thread.ret; | |
97 | CloseHandle(thread.handle); | |
98 | } | |
99 | ||
100 | static inline int pthread_mutex_init(pthread_mutex_t *m, void* attr) | |
101 | { | |
102 | InitializeCriticalSection(m); | |
103 | return 0; | |
104 | } | |
105 | static inline int pthread_mutex_destroy(pthread_mutex_t *m) | |
106 | { | |
107 | DeleteCriticalSection(m); | |
108 | return 0; | |
109 | } | |
110 | static inline int pthread_mutex_lock(pthread_mutex_t *m) | |
111 | { | |
112 | EnterCriticalSection(m); | |
113 | return 0; | |
114 | } | |
115 | static inline int pthread_mutex_unlock(pthread_mutex_t *m) | |
116 | { | |
117 | LeaveCriticalSection(m); | |
118 | return 0; | |
119 | } | |
120 | ||
f6fa7814 DM |
121 | #if _WIN32_WINNT >= 0x0600 |
122 | static inline int pthread_cond_init(pthread_cond_t *cond, const void *unused_attr) | |
123 | { | |
124 | InitializeConditionVariable(cond); | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /* native condition variables do not destroy */ | |
129 | static inline void pthread_cond_destroy(pthread_cond_t *cond) | |
130 | { | |
131 | return; | |
132 | } | |
133 | ||
134 | static inline void pthread_cond_broadcast(pthread_cond_t *cond) | |
135 | { | |
136 | WakeAllConditionVariable(cond); | |
137 | } | |
138 | ||
139 | static inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex) | |
140 | { | |
141 | SleepConditionVariableCS(cond, mutex, INFINITE); | |
142 | return 0; | |
143 | } | |
144 | ||
145 | static inline void pthread_cond_signal(pthread_cond_t *cond) | |
146 | { | |
147 | WakeConditionVariable(cond); | |
148 | } | |
149 | ||
150 | #else // _WIN32_WINNT < 0x0600 | |
2ba45a60 DM |
151 | /* for pre-Windows 6.0 platforms we need to define and use our own condition |
152 | * variable and api */ | |
153 | typedef struct win32_cond_t { | |
154 | pthread_mutex_t mtx_broadcast; | |
155 | pthread_mutex_t mtx_waiter_count; | |
156 | volatile int waiter_count; | |
157 | HANDLE semaphore; | |
158 | HANDLE waiters_done; | |
159 | volatile int is_broadcast; | |
160 | } win32_cond_t; | |
161 | ||
f6fa7814 DM |
162 | /* function pointers to conditional variable API on windows 6.0+ kernels */ |
163 | static void (WINAPI *cond_broadcast)(pthread_cond_t *cond); | |
164 | static void (WINAPI *cond_init)(pthread_cond_t *cond); | |
165 | static void (WINAPI *cond_signal)(pthread_cond_t *cond); | |
166 | static BOOL (WINAPI *cond_wait)(pthread_cond_t *cond, pthread_mutex_t *mutex, | |
167 | DWORD milliseconds); | |
168 | ||
2ba45a60 DM |
169 | static av_unused int pthread_cond_init(pthread_cond_t *cond, const void *unused_attr) |
170 | { | |
171 | win32_cond_t *win32_cond = NULL; | |
172 | if (cond_init) { | |
173 | cond_init(cond); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | /* non native condition variables */ | |
178 | win32_cond = av_mallocz(sizeof(win32_cond_t)); | |
179 | if (!win32_cond) | |
180 | return ENOMEM; | |
f6fa7814 | 181 | cond->Ptr = win32_cond; |
2ba45a60 DM |
182 | win32_cond->semaphore = CreateSemaphore(NULL, 0, 0x7fffffff, NULL); |
183 | if (!win32_cond->semaphore) | |
184 | return ENOMEM; | |
185 | win32_cond->waiters_done = CreateEvent(NULL, TRUE, FALSE, NULL); | |
186 | if (!win32_cond->waiters_done) | |
187 | return ENOMEM; | |
188 | ||
189 | pthread_mutex_init(&win32_cond->mtx_waiter_count, NULL); | |
190 | pthread_mutex_init(&win32_cond->mtx_broadcast, NULL); | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static av_unused void pthread_cond_destroy(pthread_cond_t *cond) | |
195 | { | |
f6fa7814 | 196 | win32_cond_t *win32_cond = cond->Ptr; |
2ba45a60 DM |
197 | /* native condition variables do not destroy */ |
198 | if (cond_init) | |
199 | return; | |
200 | ||
201 | /* non native condition variables */ | |
202 | CloseHandle(win32_cond->semaphore); | |
203 | CloseHandle(win32_cond->waiters_done); | |
204 | pthread_mutex_destroy(&win32_cond->mtx_waiter_count); | |
205 | pthread_mutex_destroy(&win32_cond->mtx_broadcast); | |
206 | av_freep(&win32_cond); | |
f6fa7814 | 207 | cond->Ptr = NULL; |
2ba45a60 DM |
208 | } |
209 | ||
210 | static av_unused void pthread_cond_broadcast(pthread_cond_t *cond) | |
211 | { | |
f6fa7814 | 212 | win32_cond_t *win32_cond = cond->Ptr; |
2ba45a60 DM |
213 | int have_waiter; |
214 | ||
215 | if (cond_broadcast) { | |
216 | cond_broadcast(cond); | |
217 | return; | |
218 | } | |
219 | ||
220 | /* non native condition variables */ | |
221 | pthread_mutex_lock(&win32_cond->mtx_broadcast); | |
222 | pthread_mutex_lock(&win32_cond->mtx_waiter_count); | |
223 | have_waiter = 0; | |
224 | ||
225 | if (win32_cond->waiter_count) { | |
226 | win32_cond->is_broadcast = 1; | |
227 | have_waiter = 1; | |
228 | } | |
229 | ||
230 | if (have_waiter) { | |
231 | ReleaseSemaphore(win32_cond->semaphore, win32_cond->waiter_count, NULL); | |
232 | pthread_mutex_unlock(&win32_cond->mtx_waiter_count); | |
233 | WaitForSingleObject(win32_cond->waiters_done, INFINITE); | |
234 | ResetEvent(win32_cond->waiters_done); | |
235 | win32_cond->is_broadcast = 0; | |
236 | } else | |
237 | pthread_mutex_unlock(&win32_cond->mtx_waiter_count); | |
238 | pthread_mutex_unlock(&win32_cond->mtx_broadcast); | |
239 | } | |
240 | ||
241 | static av_unused int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex) | |
242 | { | |
f6fa7814 | 243 | win32_cond_t *win32_cond = cond->Ptr; |
2ba45a60 DM |
244 | int last_waiter; |
245 | if (cond_wait) { | |
246 | cond_wait(cond, mutex, INFINITE); | |
247 | return 0; | |
248 | } | |
249 | ||
250 | /* non native condition variables */ | |
251 | pthread_mutex_lock(&win32_cond->mtx_broadcast); | |
252 | pthread_mutex_lock(&win32_cond->mtx_waiter_count); | |
253 | win32_cond->waiter_count++; | |
254 | pthread_mutex_unlock(&win32_cond->mtx_waiter_count); | |
255 | pthread_mutex_unlock(&win32_cond->mtx_broadcast); | |
256 | ||
257 | // unlock the external mutex | |
258 | pthread_mutex_unlock(mutex); | |
259 | WaitForSingleObject(win32_cond->semaphore, INFINITE); | |
260 | ||
261 | pthread_mutex_lock(&win32_cond->mtx_waiter_count); | |
262 | win32_cond->waiter_count--; | |
263 | last_waiter = !win32_cond->waiter_count || !win32_cond->is_broadcast; | |
264 | pthread_mutex_unlock(&win32_cond->mtx_waiter_count); | |
265 | ||
266 | if (last_waiter) | |
267 | SetEvent(win32_cond->waiters_done); | |
268 | ||
269 | // lock the external mutex | |
270 | return pthread_mutex_lock(mutex); | |
271 | } | |
272 | ||
273 | static av_unused void pthread_cond_signal(pthread_cond_t *cond) | |
274 | { | |
f6fa7814 | 275 | win32_cond_t *win32_cond = cond->Ptr; |
2ba45a60 DM |
276 | int have_waiter; |
277 | if (cond_signal) { | |
278 | cond_signal(cond); | |
279 | return; | |
280 | } | |
281 | ||
282 | pthread_mutex_lock(&win32_cond->mtx_broadcast); | |
283 | ||
284 | /* non-native condition variables */ | |
285 | pthread_mutex_lock(&win32_cond->mtx_waiter_count); | |
286 | have_waiter = win32_cond->waiter_count; | |
287 | pthread_mutex_unlock(&win32_cond->mtx_waiter_count); | |
288 | ||
289 | if (have_waiter) { | |
290 | ReleaseSemaphore(win32_cond->semaphore, 1, NULL); | |
291 | WaitForSingleObject(win32_cond->waiters_done, INFINITE); | |
292 | ResetEvent(win32_cond->waiters_done); | |
293 | } | |
294 | ||
295 | pthread_mutex_unlock(&win32_cond->mtx_broadcast); | |
296 | } | |
f6fa7814 | 297 | #endif |
2ba45a60 DM |
298 | |
299 | static av_unused void w32thread_init(void) | |
300 | { | |
301 | #if _WIN32_WINNT < 0x0600 | |
302 | HANDLE kernel_dll = GetModuleHandle(TEXT("kernel32.dll")); | |
303 | /* if one is available, then they should all be available */ | |
304 | cond_init = | |
305 | (void*)GetProcAddress(kernel_dll, "InitializeConditionVariable"); | |
306 | cond_broadcast = | |
307 | (void*)GetProcAddress(kernel_dll, "WakeAllConditionVariable"); | |
308 | cond_signal = | |
309 | (void*)GetProcAddress(kernel_dll, "WakeConditionVariable"); | |
310 | cond_wait = | |
311 | (void*)GetProcAddress(kernel_dll, "SleepConditionVariableCS"); | |
312 | #endif | |
313 | ||
314 | } | |
315 | ||
316 | #endif /* FFMPEG_COMPAT_W32PTHREADS_H */ |