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os2threads.h
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1 /*
2  * Copyright (c) 2011 KO Myung-Hun <komh@chollian.net>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * os2threads to pthreads wrapper
24  */
25 
26 #ifndef AVCODEC_OS2PTHREADS_H
27 #define AVCODEC_OS2PTHREADS_H
28 
29 #define INCL_DOS
30 #include <os2.h>
31 
32 #undef __STRICT_ANSI__ /* for _beginthread() */
33 #include <stdlib.h>
34 
35 #include "libavutil/mem.h"
36 
37 typedef TID pthread_t;
38 typedef void pthread_attr_t;
39 
40 typedef HMTX pthread_mutex_t;
41 typedef void pthread_mutexattr_t;
42 
43 typedef struct {
44  HEV event_sem;
47 
48 typedef void pthread_condattr_t;
49 
50 struct thread_arg {
51  void *(*start_routine)(void *);
52  void *arg;
53 };
54 
55 static void thread_entry(void *arg)
56 {
57  struct thread_arg *thread_arg = arg;
58 
59  thread_arg->start_routine(thread_arg->arg);
60 
61  av_free(thread_arg);
62 }
63 
64 static av_always_inline int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine)(void*), void *arg)
65 {
66  struct thread_arg *thread_arg;
67 
68  thread_arg = av_mallocz(sizeof(struct thread_arg));
69  if (!thread_arg)
70  return ENOMEM;
71 
72  thread_arg->start_routine = start_routine;
73  thread_arg->arg = arg;
74 
75  *thread = _beginthread(thread_entry, NULL, 256 * 1024, thread_arg);
76 
77  return 0;
78 }
79 
80 static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
81 {
82  DosWaitThread((PTID)&thread, DCWW_WAIT);
83 
84  return 0;
85 }
86 
88 {
89  DosCreateMutexSem(NULL, (PHMTX)mutex, 0, FALSE);
90 
91  return 0;
92 }
93 
95 {
96  DosCloseMutexSem(*(PHMTX)mutex);
97 
98  return 0;
99 }
100 
102 {
103  DosRequestMutexSem(*(PHMTX)mutex, SEM_INDEFINITE_WAIT);
104 
105  return 0;
106 }
107 
109 {
110  DosReleaseMutexSem(*(PHMTX)mutex);
111 
112  return 0;
113 }
114 
116 {
117  DosCreateEventSem(NULL, &cond->event_sem, DCE_POSTONE, FALSE);
118 
119  cond->wait_count = 0;
120 
121  return 0;
122 }
123 
125 {
126  DosCloseEventSem(cond->event_sem);
127 
128  return 0;
129 }
130 
132 {
133  if (cond->wait_count > 0) {
134  DosPostEventSem(cond->event_sem);
135 
136  cond->wait_count--;
137  }
138 
139  return 0;
140 }
141 
143 {
144  while (cond->wait_count > 0) {
145  DosPostEventSem(cond->event_sem);
146 
147  cond->wait_count--;
148  }
149 
150  return 0;
151 }
152 
154 {
155  cond->wait_count++;
156 
157  pthread_mutex_unlock(mutex);
158 
159  DosWaitEventSem(cond->event_sem, SEM_INDEFINITE_WAIT);
160 
161  pthread_mutex_lock(mutex);
162 
163  return 0;
164 }
165 
166 #endif /* AVCODEC_OS2PTHREADS_H */
#define NULL
Definition: coverity.c:32
static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
Definition: os2threads.h:94
static void thread_entry(void *arg)
Definition: os2threads.h:55
static av_always_inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
Definition: os2threads.h:153
memory handling functions
static av_always_inline int pthread_cond_destroy(pthread_cond_t *cond)
Definition: os2threads.h:124
void *(* start_routine)(void *)
Definition: os2threads.h:51
void pthread_mutexattr_t
Definition: os2threads.h:41
HMTX pthread_mutex_t
Definition: os2threads.h:40
void * arg
Definition: os2threads.h:52
static av_always_inline int pthread_cond_signal(pthread_cond_t *cond)
Definition: os2threads.h:131
#define FALSE
Definition: windows2linux.h:37
const char * arg
Definition: jacosubdec.c:66
TID pthread_t
Definition: os2threads.h:37
static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
Definition: os2threads.h:80
static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
Definition: os2threads.h:87
void pthread_attr_t
Definition: os2threads.h:38
static pthread_mutex_t * mutex
Definition: w32pthreads.h:166
static av_always_inline int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
Definition: os2threads.h:64
static av_always_inline int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
Definition: os2threads.h:115
void pthread_condattr_t
Definition: os2threads.h:48
#define av_free(p)
static av_always_inline int pthread_cond_broadcast(pthread_cond_t *cond)
Definition: os2threads.h:142
static av_always_inline int pthread_mutex_unlock(pthread_mutex_t *mutex)
Definition: os2threads.h:108
#define av_always_inline
Definition: attributes.h:37
static av_always_inline int pthread_mutex_lock(pthread_mutex_t *mutex)
Definition: os2threads.h:101
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:250