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
66 #define PTHREAD_CANCEL_ENABLE 1
67 #define PTHREAD_CANCEL_DISABLE 0
68
win32thread_worker(void * arg)69 static av_unused unsigned __stdcall attribute_align_arg win32thread_worker(void *arg)
70 {
71 pthread_t *h = (pthread_t*)arg;
72 h->ret = h->func(h->arg);
73 return 0;
74 }
75
pthread_create(pthread_t * thread,const void * unused_attr,void * (* start_routine)(void *),void * arg)76 static av_unused int pthread_create(pthread_t *thread, const void *unused_attr,
77 void *(*start_routine)(void*), void *arg)
78 {
79 thread->func = start_routine;
80 thread->arg = arg;
81 #if HAVE_WINRT
82 thread->handle = (void*)CreateThread(NULL, 0, win32thread_worker, thread,
83 0, NULL);
84 #else
85 thread->handle = (void*)_beginthreadex(NULL, 0, win32thread_worker, thread,
86 0, NULL);
87 #endif
88 return !thread->handle;
89 }
90
pthread_join(pthread_t thread,void ** value_ptr)91 static av_unused int pthread_join(pthread_t thread, void **value_ptr)
92 {
93 DWORD ret = WaitForSingleObject(thread.handle, INFINITE);
94 if (ret != WAIT_OBJECT_0) {
95 if (ret == WAIT_ABANDONED)
96 return EINVAL;
97 else
98 return EDEADLK;
99 }
100 if (value_ptr)
101 *value_ptr = thread.ret;
102 CloseHandle(thread.handle);
103 return 0;
104 }
105
pthread_mutex_init(pthread_mutex_t * m,void * attr)106 static inline int pthread_mutex_init(pthread_mutex_t *m, void* attr)
107 {
108 InitializeSRWLock(m);
109 return 0;
110 }
pthread_mutex_destroy(pthread_mutex_t * m)111 static inline int pthread_mutex_destroy(pthread_mutex_t *m)
112 {
113 /* Unlocked SWR locks use no resources */
114 return 0;
115 }
pthread_mutex_lock(pthread_mutex_t * m)116 static inline int pthread_mutex_lock(pthread_mutex_t *m)
117 {
118 AcquireSRWLockExclusive(m);
119 return 0;
120 }
pthread_mutex_unlock(pthread_mutex_t * m)121 static inline int pthread_mutex_unlock(pthread_mutex_t *m)
122 {
123 ReleaseSRWLockExclusive(m);
124 return 0;
125 }
126
127 typedef INIT_ONCE pthread_once_t;
128 #define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT
129
pthread_once(pthread_once_t * once_control,void (* init_routine)(void))130 static av_unused int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
131 {
132 BOOL pending = FALSE;
133 InitOnceBeginInitialize(once_control, 0, &pending, NULL);
134 if (pending)
135 init_routine();
136 InitOnceComplete(once_control, 0, NULL);
137 return 0;
138 }
139
pthread_cond_init(pthread_cond_t * cond,const void * unused_attr)140 static inline int pthread_cond_init(pthread_cond_t *cond, const void *unused_attr)
141 {
142 InitializeConditionVariable(cond);
143 return 0;
144 }
145
146 /* native condition variables do not destroy */
pthread_cond_destroy(pthread_cond_t * cond)147 static inline int pthread_cond_destroy(pthread_cond_t *cond)
148 {
149 return 0;
150 }
151
pthread_cond_broadcast(pthread_cond_t * cond)152 static inline int pthread_cond_broadcast(pthread_cond_t *cond)
153 {
154 WakeAllConditionVariable(cond);
155 return 0;
156 }
157
pthread_cond_wait(pthread_cond_t * cond,pthread_mutex_t * mutex)158 static inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
159 {
160 SleepConditionVariableSRW(cond, mutex, INFINITE, 0);
161 return 0;
162 }
163
pthread_cond_timedwait(pthread_cond_t * cond,pthread_mutex_t * mutex,const struct timespec * abstime)164 static inline int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
165 const struct timespec *abstime)
166 {
167 int64_t abs_milli = abstime->tv_sec * 1000LL + abstime->tv_nsec / 1000000;
168 DWORD t = av_clip64(abs_milli - av_gettime() / 1000, 0, UINT32_MAX);
169
170 if (!SleepConditionVariableSRW(cond, mutex, t, 0)) {
171 DWORD err = GetLastError();
172 if (err == ERROR_TIMEOUT)
173 return ETIMEDOUT;
174 else
175 return EINVAL;
176 }
177 return 0;
178 }
179
pthread_cond_signal(pthread_cond_t * cond)180 static inline int pthread_cond_signal(pthread_cond_t *cond)
181 {
182 WakeConditionVariable(cond);
183 return 0;
184 }
185
pthread_setcancelstate(int state,int * oldstate)186 static inline int pthread_setcancelstate(int state, int *oldstate)
187 {
188 return 0;
189 }
190
191 #endif /* COMPAT_W32PTHREADS_H */
192