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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 typedef TID pthread_t;
36 typedef void pthread_attr_t;
37 
38 typedef HMTX pthread_mutex_t;
39 typedef void pthread_mutexattr_t;
40 
41 typedef struct {
42  HEV event_sem;
45 
46 typedef void pthread_condattr_t;
47 
48 struct thread_arg {
49  void *(*start_routine)(void *);
50  void *arg;
51 };
52 
53 static void thread_entry(void *arg)
54 {
55  struct thread_arg *thread_arg = arg;
56 
57  thread_arg->start_routine(thread_arg->arg);
58 
59  av_free(thread_arg);
60 }
61 
62 static av_always_inline int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine)(void*), void *arg)
63 {
64  struct thread_arg *thread_arg;
65 
66  thread_arg = av_mallocz(sizeof(struct thread_arg));
67 
68  thread_arg->start_routine = start_routine;
69  thread_arg->arg = arg;
70 
71  *thread = _beginthread(thread_entry, NULL, 256 * 1024, thread_arg);
72 
73  return 0;
74 }
75 
76 static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
77 {
78  DosWaitThread((PTID)&thread, DCWW_WAIT);
79 
80  return 0;
81 }
82 
84 {
85  DosCreateMutexSem(NULL, (PHMTX)mutex, 0, FALSE);
86 
87  return 0;
88 }
89 
91 {
92  DosCloseMutexSem(*(PHMTX)mutex);
93 
94  return 0;
95 }
96 
98 {
99  DosRequestMutexSem(*(PHMTX)mutex, SEM_INDEFINITE_WAIT);
100 
101  return 0;
102 }
103 
105 {
106  DosReleaseMutexSem(*(PHMTX)mutex);
107 
108  return 0;
109 }
110 
112 {
113  DosCreateEventSem(NULL, &cond->event_sem, DCE_POSTONE, FALSE);
114 
115  cond->wait_count = 0;
116 
117  return 0;
118 }
119 
121 {
122  DosCloseEventSem(cond->event_sem);
123 
124  return 0;
125 }
126 
128 {
129  if (cond->wait_count > 0) {
130  DosPostEventSem(cond->event_sem);
131 
132  cond->wait_count--;
133  }
134 
135  return 0;
136 }
137 
139 {
140  while (cond->wait_count > 0) {
141  DosPostEventSem(cond->event_sem);
142 
143  cond->wait_count--;
144  }
145 
146  return 0;
147 }
148 
150 {
151  cond->wait_count++;
152 
153  pthread_mutex_unlock(mutex);
154 
155  DosWaitEventSem(cond->event_sem, SEM_INDEFINITE_WAIT);
156 
157  pthread_mutex_lock(mutex);
158 
159  return 0;
160 }
161 
162 #endif /* AVCODEC_OS2PTHREADS_H */