FFmpeg
w32pthreads.h
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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 
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 /* use light weight mutex/condition variable API for Windows Vista and later */
55 typedef SRWLOCK pthread_mutex_t;
56 typedef CONDITION_VARIABLE pthread_cond_t;
57 
58 #define PTHREAD_MUTEX_INITIALIZER SRWLOCK_INIT
59 #define PTHREAD_COND_INITIALIZER CONDITION_VARIABLE_INIT
60 
61 #define InitializeCriticalSection(x) InitializeCriticalSectionEx(x, 0, 0)
62 #define WaitForSingleObject(a, b) WaitForSingleObjectEx(a, b, FALSE)
63 
64 static av_unused unsigned __stdcall attribute_align_arg win32thread_worker(void *arg)
65 {
66  pthread_t *h = (pthread_t*)arg;
67  h->ret = h->func(h->arg);
68  return 0;
69 }
70 
71 static av_unused int pthread_create(pthread_t *thread, const void *unused_attr,
72  void *(*start_routine)(void*), void *arg)
73 {
74  thread->func = start_routine;
75  thread->arg = arg;
76 #if HAVE_WINRT
77  thread->handle = (void*)CreateThread(NULL, 0, win32thread_worker, thread,
78  0, NULL);
79 #else
80  thread->handle = (void*)_beginthreadex(NULL, 0, win32thread_worker, thread,
81  0, NULL);
82 #endif
83  return !thread->handle;
84 }
85 
86 static av_unused int pthread_join(pthread_t thread, void **value_ptr)
87 {
88  DWORD ret = WaitForSingleObject(thread.handle, INFINITE);
89  if (ret != WAIT_OBJECT_0) {
90  if (ret == WAIT_ABANDONED)
91  return EINVAL;
92  else
93  return EDEADLK;
94  }
95  if (value_ptr)
96  *value_ptr = thread.ret;
97  CloseHandle(thread.handle);
98  return 0;
99 }
100 
101 static inline int pthread_mutex_init(pthread_mutex_t *m, void* attr)
102 {
103  InitializeSRWLock(m);
104  return 0;
105 }
107 {
108  /* Unlocked SWR locks use no resources */
109  return 0;
110 }
111 static inline int pthread_mutex_lock(pthread_mutex_t *m)
112 {
113  AcquireSRWLockExclusive(m);
114  return 0;
115 }
117 {
118  ReleaseSRWLockExclusive(m);
119  return 0;
120 }
121 
122 typedef INIT_ONCE pthread_once_t;
123 #define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT
124 
125 static av_unused int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
126 {
127  BOOL pending = FALSE;
128  InitOnceBeginInitialize(once_control, 0, &pending, NULL);
129  if (pending)
130  init_routine();
131  InitOnceComplete(once_control, 0, NULL);
132  return 0;
133 }
134 
135 static inline int pthread_cond_init(pthread_cond_t *cond, const void *unused_attr)
136 {
137  InitializeConditionVariable(cond);
138  return 0;
139 }
140 
141 /* native condition variables do not destroy */
143 {
144  return 0;
145 }
146 
148 {
149  WakeAllConditionVariable(cond);
150  return 0;
151 }
152 
154 {
155  SleepConditionVariableSRW(cond, mutex, INFINITE, 0);
156  return 0;
157 }
158 
160 {
161  WakeConditionVariable(cond);
162  return 0;
163 }
164 
165 #endif /* COMPAT_W32PTHREADS_H */
#define NULL
Definition: coverity.c:32
static int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
Definition: w32pthreads.h:153
static AVMutex mutex
Definition: log.c:44
#define WaitForSingleObject(a, b)
Definition: w32pthreads.h:62
CONDITION_VARIABLE pthread_cond_t
Definition: w32pthreads.h:56
static av_unused unsigned __stdcall attribute_align_arg win32thread_worker(void *arg)
Definition: w32pthreads.h:64
Memory handling functions.
Macro definitions for various function/variable attributes.
static int pthread_cond_destroy(pthread_cond_t *cond)
Definition: w32pthreads.h:142
static av_unused int pthread_create(pthread_t *thread, const void *unused_attr, void *(*start_routine)(void *), void *arg)
Definition: w32pthreads.h:71
void * ret
Definition: w32pthreads.h:51
SRWLOCK pthread_mutex_t
Definition: w32pthreads.h:55
void * arg
Definition: os2threads.h:43
static int pthread_mutex_init(pthread_mutex_t *m, void *attr)
Definition: w32pthreads.h:101
#define FALSE
Definition: windows2linux.h:37
static int pthread_mutex_unlock(pthread_mutex_t *m)
Definition: w32pthreads.h:116
common internal API header
static int pthread_mutex_destroy(pthread_mutex_t *m)
Definition: w32pthreads.h:106
void *(* func)(void *arg)
Definition: w32pthreads.h:49
void *(* start_routine)(void *)
Definition: os2threads.h:42
static int pthread_cond_signal(pthread_cond_t *cond)
Definition: w32pthreads.h:159
INIT_ONCE pthread_once_t
Definition: w32pthreads.h:122
static int pthread_mutex_lock(pthread_mutex_t *m)
Definition: w32pthreads.h:111
uint32_t DWORD
static av_unused int pthread_once(pthread_once_t *once_control, void(*init_routine)(void))
Definition: w32pthreads.h:125
#define __stdcall
Definition: windows2linux.h:21
int(* cond)(enum AVPixelFormat pix_fmt)
Definition: pixdesc_query.c:28
static int pthread_cond_broadcast(pthread_cond_t *cond)
Definition: w32pthreads.h:147
static av_unused int pthread_join(pthread_t thread, void **value_ptr)
Definition: w32pthreads.h:86
_fmutex pthread_mutex_t
Definition: os2threads.h:49
common internal and external API header
void * handle
Definition: w32pthreads.h:48
uint32_t BOOL
static int pthread_cond_init(pthread_cond_t *cond, const void *unused_attr)
Definition: w32pthreads.h:135
#define av_unused
Definition: attributes.h:125