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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 
70  thread_arg->start_routine = start_routine;
71  thread_arg->arg = arg;
72 
73  *thread = _beginthread(thread_entry, NULL, 256 * 1024, thread_arg);
74 
75  return 0;
76 }
77 
78 static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
79 {
80  DosWaitThread((PTID)&thread, DCWW_WAIT);
81 
82  return 0;
83 }
84 
86 {
87  DosCreateMutexSem(NULL, (PHMTX)mutex, 0, FALSE);
88 
89  return 0;
90 }
91 
93 {
94  DosCloseMutexSem(*(PHMTX)mutex);
95 
96  return 0;
97 }
98 
100 {
101  DosRequestMutexSem(*(PHMTX)mutex, SEM_INDEFINITE_WAIT);
102 
103  return 0;
104 }
105 
107 {
108  DosReleaseMutexSem(*(PHMTX)mutex);
109 
110  return 0;
111 }
112 
114 {
115  DosCreateEventSem(NULL, &cond->event_sem, DCE_POSTONE, FALSE);
116 
117  cond->wait_count = 0;
118 
119  return 0;
120 }
121 
123 {
124  DosCloseEventSem(cond->event_sem);
125 
126  return 0;
127 }
128 
130 {
131  if (cond->wait_count > 0) {
132  DosPostEventSem(cond->event_sem);
133 
134  cond->wait_count--;
135  }
136 
137  return 0;
138 }
139 
141 {
142  while (cond->wait_count > 0) {
143  DosPostEventSem(cond->event_sem);
144 
145  cond->wait_count--;
146  }
147 
148  return 0;
149 }
150 
152 {
153  cond->wait_count++;
154 
155  pthread_mutex_unlock(mutex);
156 
157  DosWaitEventSem(cond->event_sem, SEM_INDEFINITE_WAIT);
158 
159  pthread_mutex_lock(mutex);
160 
161  return 0;
162 }
163 
164 #endif /* AVCODEC_OS2PTHREADS_H */