1 /*
2 * Copyright (c) 2011-2017 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 COMPAT_OS2THREADS_H
27 #define COMPAT_OS2THREADS_H
28
29 #define INCL_DOS
30 #define INCL_DOSERRORS
31 #include <os2.h>
32
33 #undef __STRICT_ANSI__ /* for _beginthread() */
34 #include <stdlib.h>
35 #include <time.h>
36
37 #include <sys/builtin.h>
38 #include <sys/fmutex.h>
39
40 #include "libavutil/attributes.h"
41 #include "libavutil/common.h"
42 #include "libavutil/time.h"
43
44 typedef struct {
45 TID tid;
46 void *(*start_routine)(void *);
47 void *arg;
48 void *result;
49 } pthread_t;
50
51 typedef void pthread_attr_t;
52
53 typedef _fmutex pthread_mutex_t;
54 typedef void pthread_mutexattr_t;
55
56 #define PTHREAD_MUTEX_INITIALIZER _FMUTEX_INITIALIZER
57
58 typedef struct {
59 HEV event_sem;
60 HEV ack_sem;
61 volatile unsigned wait_count;
62 } pthread_cond_t;
63
64 typedef void pthread_condattr_t;
65
66 typedef struct {
67 volatile int done;
68 _fmutex mtx;
69 } pthread_once_t;
70
71 #define PTHREAD_ONCE_INIT {0, _FMUTEX_INITIALIZER}
72
thread_entry(void * arg)73 static void thread_entry(void *arg)
74 {
75 pthread_t *thread = arg;
76
77 thread->result = thread->start_routine(thread->arg);
78 }
79
pthread_create(pthread_t * thread,const pthread_attr_t * attr,void * (* start_routine)(void *),void * arg)80 static av_always_inline int pthread_create(pthread_t *thread,
81 const pthread_attr_t *attr,
82 void *(*start_routine)(void*),
83 void *arg)
84 {
85 thread->start_routine = start_routine;
86 thread->arg = arg;
87 thread->result = NULL;
88
89 thread->tid = _beginthread(thread_entry, NULL, 1024 * 1024, thread);
90
91 return 0;
92 }
93
pthread_join(pthread_t thread,void ** value_ptr)94 static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
95 {
96 DosWaitThread(&thread.tid, DCWW_WAIT);
97
98 if (value_ptr)
99 *value_ptr = thread.result;
100
101 return 0;
102 }
103
pthread_mutex_init(pthread_mutex_t * mutex,const pthread_mutexattr_t * attr)104 static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex,
105 const pthread_mutexattr_t *attr)
106 {
107 _fmutex_create(mutex, 0);
108
109 return 0;
110 }
111
pthread_mutex_destroy(pthread_mutex_t * mutex)112 static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
113 {
114 _fmutex_close(mutex);
115
116 return 0;
117 }
118
pthread_mutex_lock(pthread_mutex_t * mutex)119 static av_always_inline int pthread_mutex_lock(pthread_mutex_t *mutex)
120 {
121 _fmutex_request(mutex, 0);
122
123 return 0;
124 }
125
pthread_mutex_unlock(pthread_mutex_t * mutex)126 static av_always_inline int pthread_mutex_unlock(pthread_mutex_t *mutex)
127 {
128 _fmutex_release(mutex);
129
130 return 0;
131 }
132
pthread_cond_init(pthread_cond_t * cond,const pthread_condattr_t * attr)133 static av_always_inline int pthread_cond_init(pthread_cond_t *cond,
134 const pthread_condattr_t *attr)
135 {
136 DosCreateEventSem(NULL, &cond->event_sem, DCE_POSTONE, FALSE);
137 DosCreateEventSem(NULL, &cond->ack_sem, DCE_POSTONE, FALSE);
138
139 cond->wait_count = 0;
140
141 return 0;
142 }
143
pthread_cond_destroy(pthread_cond_t * cond)144 static av_always_inline int pthread_cond_destroy(pthread_cond_t *cond)
145 {
146 DosCloseEventSem(cond->event_sem);
147 DosCloseEventSem(cond->ack_sem);
148
149 return 0;
150 }
151
pthread_cond_signal(pthread_cond_t * cond)152 static av_always_inline int pthread_cond_signal(pthread_cond_t *cond)
153 {
154 if (!__atomic_cmpxchg32(&cond->wait_count, 0, 0)) {
155 DosPostEventSem(cond->event_sem);
156 DosWaitEventSem(cond->ack_sem, SEM_INDEFINITE_WAIT);
157 }
158
159 return 0;
160 }
161
pthread_cond_broadcast(pthread_cond_t * cond)162 static av_always_inline int pthread_cond_broadcast(pthread_cond_t *cond)
163 {
164 while (!__atomic_cmpxchg32(&cond->wait_count, 0, 0))
165 pthread_cond_signal(cond);
166
167 return 0;
168 }
169
pthread_cond_timedwait(pthread_cond_t * cond,pthread_mutex_t * mutex,const struct timespec * abstime)170 static av_always_inline int pthread_cond_timedwait(pthread_cond_t *cond,
171 pthread_mutex_t *mutex,
172 const struct timespec *abstime)
173 {
174 int64_t abs_milli = abstime->tv_sec * 1000LL + abstime->tv_nsec / 1000000;
175 ULONG t = av_clip64(abs_milli - av_gettime() / 1000, 0, ULONG_MAX);
176
177 __atomic_increment(&cond->wait_count);
178
179 pthread_mutex_unlock(mutex);
180
181 APIRET ret = DosWaitEventSem(cond->event_sem, t);
182
183 __atomic_decrement(&cond->wait_count);
184
185 DosPostEventSem(cond->ack_sem);
186
187 pthread_mutex_lock(mutex);
188
189 return (ret == ERROR_TIMEOUT) ? ETIMEDOUT : 0;
190 }
191
pthread_cond_wait(pthread_cond_t * cond,pthread_mutex_t * mutex)192 static av_always_inline int pthread_cond_wait(pthread_cond_t *cond,
193 pthread_mutex_t *mutex)
194 {
195 __atomic_increment(&cond->wait_count);
196
197 pthread_mutex_unlock(mutex);
198
199 DosWaitEventSem(cond->event_sem, SEM_INDEFINITE_WAIT);
200
201 __atomic_decrement(&cond->wait_count);
202
203 DosPostEventSem(cond->ack_sem);
204
205 pthread_mutex_lock(mutex);
206
207 return 0;
208 }
209
pthread_once(pthread_once_t * once_control,void (* init_routine)(void))210 static av_always_inline int pthread_once(pthread_once_t *once_control,
211 void (*init_routine)(void))
212 {
213 if (!once_control->done)
214 {
215 _fmutex_request(&once_control->mtx, 0);
216
217 if (!once_control->done)
218 {
219 init_routine();
220
221 once_control->done = 1;
222 }
223
224 _fmutex_release(&once_control->mtx);
225 }
226
227 return 0;
228 }
229 #endif /* COMPAT_OS2THREADS_H */
230