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 #include <windows.h>
39 #include <process.h>
40 #include <time.h>
41 
42 #include "libavutil/attributes.h"
43 #include "libavutil/common.h"
44 #include "libavutil/internal.h"
45 #include "libavutil/mem.h"
46 #include "libavutil/time.h"
47 
48 typedef struct pthread_t {
49  void *handle;
50  void *(*func)(void* arg);
51  void *arg;
52  void *ret;
53 } *pthread_t;
54 
55 /* use light weight mutex/condition variable API for Windows Vista and later */
56 typedef SRWLOCK pthread_mutex_t;
57 typedef CONDITION_VARIABLE pthread_cond_t;
58 
59 #define PTHREAD_MUTEX_INITIALIZER SRWLOCK_INIT
60 #define PTHREAD_COND_INITIALIZER CONDITION_VARIABLE_INIT
61 
62 #define InitializeCriticalSection(x) InitializeCriticalSectionEx(x, 0, 0)
63 #define WaitForSingleObject(a, b) WaitForSingleObjectEx(a, b, FALSE)
64 
65 #define PTHREAD_CANCEL_ENABLE 1
66 #define PTHREAD_CANCEL_DISABLE 0
67 
68 #if HAVE_WINRT
69 #define THREADFUNC_RETTYPE DWORD
70 #else
71 #define THREADFUNC_RETTYPE unsigned
72 #endif
73 
76 {
78  h->ret = h->func(h->arg);
79  return 0;
80 }
81 
82 static av_unused int pthread_create(pthread_t *thread, const void *unused_attr,
83  void *(*start_routine)(void*), void *arg)
84 {
85  pthread_t ret;
86 
87  ret = av_mallocz(sizeof(*ret));
88  if (!ret)
89  return EAGAIN;
90 
91  ret->func = start_routine;
92  ret->arg = arg;
93 #if HAVE_WINRT
94  ret->handle = (void*)CreateThread(NULL, 0, win32thread_worker, ret,
95  0, NULL);
96 #else
97  ret->handle = (void*)_beginthreadex(NULL, 0, win32thread_worker, ret,
98  0, NULL);
99 #endif
100 
101  if (!ret->handle) {
102  av_free(ret);
103  return EAGAIN;
104  }
105 
106  *thread = ret;
107 
108  return 0;
109 }
110 
111 static av_unused int pthread_join(pthread_t thread, void **value_ptr)
112 {
113  DWORD ret = WaitForSingleObject(thread->handle, INFINITE);
114  if (ret != WAIT_OBJECT_0) {
115  if (ret == WAIT_ABANDONED)
116  return EINVAL;
117  else
118  return EDEADLK;
119  }
120  if (value_ptr)
121  *value_ptr = thread->ret;
122  CloseHandle(thread->handle);
123  av_free(thread);
124  return 0;
125 }
126 
127 static inline int pthread_mutex_init(pthread_mutex_t *m, void* attr)
128 {
129  InitializeSRWLock(m);
130  return 0;
131 }
133 {
134  /* Unlocked SWR locks use no resources */
135  return 0;
136 }
137 static inline int pthread_mutex_lock(pthread_mutex_t *m)
138 {
139  AcquireSRWLockExclusive(m);
140  return 0;
141 }
143 {
144  ReleaseSRWLockExclusive(m);
145  return 0;
146 }
147 
149 #define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT
150 
151 static av_unused int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
152 {
153  BOOL pending = FALSE;
154  InitOnceBeginInitialize(once_control, 0, &pending, NULL);
155  if (pending)
156  init_routine();
157  InitOnceComplete(once_control, 0, NULL);
158  return 0;
159 }
160 
161 static inline int pthread_cond_init(pthread_cond_t *cond, const void *unused_attr)
162 {
163  InitializeConditionVariable(cond);
164  return 0;
165 }
166 
167 /* native condition variables do not destroy */
169 {
170  return 0;
171 }
172 
174 {
175  WakeAllConditionVariable(cond);
176  return 0;
177 }
178 
180 {
181  SleepConditionVariableSRW(cond, mutex, INFINITE, 0);
182  return 0;
183 }
184 
186  const struct timespec *abstime)
187 {
188  int64_t abs_milli = abstime->tv_sec * 1000LL + abstime->tv_nsec / 1000000;
189  DWORD t = av_clip64(abs_milli - av_gettime() / 1000, 0, UINT32_MAX);
190 
191  if (!SleepConditionVariableSRW(cond, mutex, t, 0)) {
192  DWORD err = GetLastError();
193  if (err == ERROR_TIMEOUT)
194  return ETIMEDOUT;
195  else
196  return EINVAL;
197  }
198  return 0;
199 }
200 
202 {
203  WakeConditionVariable(cond);
204  return 0;
205 }
206 
207 static inline int pthread_setcancelstate(int state, int *oldstate)
208 {
209  return 0;
210 }
211 
212 #endif /* COMPAT_W32PTHREADS_H */
pthread_mutex_t
_fmutex pthread_mutex_t
Definition: os2threads.h:53
pthread_mutex_lock
static int pthread_mutex_lock(pthread_mutex_t *m)
Definition: w32pthreads.h:137
int64_t
long long int64_t
Definition: coverity.c:34
av_unused
#define av_unused
Definition: attributes.h:131
win32thread_worker
static av_unused THREADFUNC_RETTYPE __stdcall attribute_align_arg win32thread_worker(void *arg)
Definition: w32pthreads.h:75
pthread_cond_timedwait
static int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime)
Definition: w32pthreads.h:185
pthread_cond_init
static int pthread_cond_init(pthread_cond_t *cond, const void *unused_attr)
Definition: w32pthreads.h:161
pthread_cond_broadcast
static int pthread_cond_broadcast(pthread_cond_t *cond)
Definition: w32pthreads.h:173
pthread_cond_wait
static int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
Definition: w32pthreads.h:179
av_clip64
#define av_clip64
Definition: common.h:103
pthread_cond_destroy
static int pthread_cond_destroy(pthread_cond_t *cond)
Definition: w32pthreads.h:168
pthread_t::arg
void * arg
Definition: os2threads.h:47
pthread_once
static av_unused int pthread_once(pthread_once_t *once_control, void(*init_routine)(void))
Definition: w32pthreads.h:151
THREADFUNC_RETTYPE
#define THREADFUNC_RETTYPE
Definition: w32pthreads.h:71
pthread_mutex_t
SRWLOCK pthread_mutex_t
Definition: w32pthreads.h:56
pthread_mutex_destroy
static int pthread_mutex_destroy(pthread_mutex_t *m)
Definition: w32pthreads.h:132
arg
const char * arg
Definition: jacosubdec.c:67
NULL
#define NULL
Definition: coverity.c:32
pthread_t::ret
void * ret
Definition: w32pthreads.h:52
time.h
pthread_cond_t
CONDITION_VARIABLE pthread_cond_t
Definition: w32pthreads.h:57
attribute_align_arg
#define attribute_align_arg
Definition: internal.h:50
pthread_create
static av_unused int pthread_create(pthread_t *thread, const void *unused_attr, void *(*start_routine)(void *), void *arg)
Definition: w32pthreads.h:82
attributes.h
pthread_t
Definition: os2threads.h:44
pthread_cond_signal
static int pthread_cond_signal(pthread_cond_t *cond)
Definition: w32pthreads.h:201
pthread_t::handle
void * handle
Definition: w32pthreads.h:49
internal.h
common.h
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:256
pthread_cond_t
Definition: os2threads.h:58
pthread_join
static av_unused int pthread_join(pthread_t thread, void **value_ptr)
Definition: w32pthreads.h:111
pthread_setcancelstate
static int pthread_setcancelstate(int state, int *oldstate)
Definition: w32pthreads.h:207
ret
ret
Definition: filter_design.txt:187
pthread_mutex_init
static int pthread_mutex_init(pthread_mutex_t *m, void *attr)
Definition: w32pthreads.h:127
pthread_once_t
INIT_ONCE pthread_once_t
Definition: w32pthreads.h:148
INIT_ONCE
#define INIT_ONCE(id, name)
pthread_once_t
Definition: os2threads.h:66
av_gettime
int64_t av_gettime(void)
Get the current time in microseconds.
Definition: time.c:39
mem.h
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
WaitForSingleObject
#define WaitForSingleObject(a, b)
Definition: w32pthreads.h:63
h
h
Definition: vp9dsp_template.c:2070
pthread_mutex_unlock
static int pthread_mutex_unlock(pthread_mutex_t *m)
Definition: w32pthreads.h:142
state
static struct @468 state
cond
int(* cond)(enum AVPixelFormat pix_fmt)
Definition: pixdesc_query.c:28
mutex
static AVMutex mutex
Definition: log.c:46