path: root/compat/os2threads.h (plain)
blob: 40a119ffe1751cdb8e7f00efe5bb78f0c7796c80

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