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 COMPAT_W32PTHREADS_H
30 #define 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 #include <time.h>
42
43 #include "libavutil/attributes.h"
44 #include "libavutil/common.h"
45 #include "libavutil/internal.h"
46 #include "libavutil/mem.h"
47 #include "libavutil/time.h"
48
49 typedef struct pthread_t {
50 void *handle;
51 void *(*func)(void* arg);
52 void *arg;
53 void *ret;
54 } pthread_t;
55
56 /* use light weight mutex/condition variable API for Windows Vista and later */
57 typedef SRWLOCK pthread_mutex_t;
58 typedef CONDITION_VARIABLE pthread_cond_t;
59
60 #define PTHREAD_MUTEX_INITIALIZER SRWLOCK_INIT
61 #define PTHREAD_COND_INITIALIZER CONDITION_VARIABLE_INIT
62
63 #define InitializeCriticalSection(x) InitializeCriticalSectionEx(x, 0, 0)
64 #define WaitForSingleObject(a, b) WaitForSingleObjectEx(a, b, FALSE)
65
win32thread_worker(void * arg)66 static av_unused unsigned __stdcall attribute_align_arg win32thread_worker(void *arg)
67 {
68 pthread_t *h = (pthread_t*)arg;
69 h->ret = h->func(h->arg);
70 return 0;
71 }
72
pthread_create(pthread_t * thread,const void * unused_attr,void * (* start_routine)(void *),void * arg)73 static av_unused int pthread_create(pthread_t *thread, const void *unused_attr,
74 void *(*start_routine)(void*), void *arg)
75 {
76 thread->func = start_routine;
77 thread->arg = arg;
78 #if HAVE_WINRT
79 thread->handle = (void*)CreateThread(NULL, 0, win32thread_worker, thread,
80 0, NULL);
81 #else
82 thread->handle = (void*)_beginthreadex(NULL, 0, win32thread_worker, thread,
83 0, NULL);
84 #endif
85 return !thread->handle;
86 }
87
pthread_join(pthread_t thread,void ** value_ptr)88 static av_unused int pthread_join(pthread_t thread, void **value_ptr)
89 {
90 DWORD ret = WaitForSingleObject(thread.handle, INFINITE);
91 if (ret != WAIT_OBJECT_0) {
92 if (ret == WAIT_ABANDONED)
93 return EINVAL;
94 else
95 return EDEADLK;
96 }
97 if (value_ptr)
98 *value_ptr = thread.ret;
99 CloseHandle(thread.handle);
100 return 0;
101 }
102
pthread_mutex_init(pthread_mutex_t * m,void * attr)103 static inline int pthread_mutex_init(pthread_mutex_t *m, void* attr)
104 {
105 InitializeSRWLock(m);
106 return 0;
107 }
pthread_mutex_destroy(pthread_mutex_t * m)108 static inline int pthread_mutex_destroy(pthread_mutex_t *m)
109 {
110 /* Unlocked SWR locks use no resources */
111 return 0;
112 }
pthread_mutex_lock(pthread_mutex_t * m)113 static inline int pthread_mutex_lock(pthread_mutex_t *m)
114 {
115 AcquireSRWLockExclusive(m);
116 return 0;
117 }
pthread_mutex_unlock(pthread_mutex_t * m)118 static inline int pthread_mutex_unlock(pthread_mutex_t *m)
119 {
120 ReleaseSRWLockExclusive(m);
121 return 0;
122 }
123
124 typedef INIT_ONCE pthread_once_t;
125 #define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT
126
pthread_once(pthread_once_t * once_control,void (* init_routine)(void))127 static av_unused int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
128 {
129 BOOL pending = FALSE;
130 InitOnceBeginInitialize(once_control, 0, &pending, NULL);
131 if (pending)
132 init_routine();
133 InitOnceComplete(once_control, 0, NULL);
134 return 0;
135 }
136
pthread_cond_init(pthread_cond_t * cond,const void * unused_attr)137 static inline int pthread_cond_init(pthread_cond_t *cond, const void *unused_attr)
138 {
139 InitializeConditionVariable(cond);
140 return 0;
141 }
142
143 /* native condition variables do not destroy */
pthread_cond_destroy(pthread_cond_t * cond)144 static inline int pthread_cond_destroy(pthread_cond_t *cond)
145 {
146 return 0;
147 }
148
pthread_cond_broadcast(pthread_cond_t * cond)149 static inline int pthread_cond_broadcast(pthread_cond_t *cond)
150 {
151 WakeAllConditionVariable(cond);
152 return 0;
153 }
154
pthread_cond_wait(pthread_cond_t * cond,pthread_mutex_t * mutex)155 static inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
156 {
157 SleepConditionVariableSRW(cond, mutex, INFINITE, 0);
158 return 0;
159 }
160
pthread_cond_timedwait(pthread_cond_t * cond,pthread_mutex_t * mutex,const struct timespec * abstime)161 static inline int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
162 const struct timespec *abstime)
163 {
164 int64_t abs_milli = abstime->tv_sec * 1000LL + abstime->tv_nsec / 1000000;
165 DWORD t = av_clip64(abs_milli - av_gettime() / 1000, 0, UINT32_MAX);
166
167 if (!SleepConditionVariableSRW(cond, mutex, t, 0)) {
168 DWORD err = GetLastError();
169 if (err == ERROR_TIMEOUT)
170 return ETIMEDOUT;
171 else
172 return EINVAL;
173 }
174 return 0;
175 }
176
pthread_cond_signal(pthread_cond_t * cond)177 static inline int pthread_cond_signal(pthread_cond_t *cond)
178 {
179 WakeConditionVariable(cond);
180 return 0;
181 }
182
183 #endif /* COMPAT_W32PTHREADS_H */
184