summaryrefslogtreecommitdiffstats
path: root/compat/os2threads.h
blob: 2177a033ecbb029aa0a3855a360e4123fb920d20 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
/*
 * Copyright (c) 2011-2017 KO Myung-Hun <komh@chollian.net>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * os2threads to pthreads wrapper
 */

#ifndef COMPAT_OS2THREADS_H
#define COMPAT_OS2THREADS_H

#define INCL_DOS
#include <os2.h>

#undef __STRICT_ANSI__          /* for _beginthread() */
#include <stdlib.h>

#include <sys/builtin.h>
#include <sys/fmutex.h>

#include "libavutil/attributes.h"

typedef struct {
    TID tid;
    void *(*start_routine)(void *);
    void *arg;
    void *result;
} pthread_t;

typedef void pthread_attr_t;

typedef _fmutex pthread_mutex_t;
typedef void pthread_mutexattr_t;

#define PTHREAD_MUTEX_INITIALIZER _FMUTEX_INITIALIZER

typedef struct {
    HEV event_sem;
    HEV ack_sem;
    volatile unsigned  wait_count;
} pthread_cond_t;

typedef void pthread_condattr_t;

typedef struct {
    volatile int done;
    _fmutex mtx;
} pthread_once_t;

#define PTHREAD_ONCE_INIT {0, _FMUTEX_INITIALIZER}

static void thread_entry(void *arg)
{
    pthread_t *thread = arg;

    thread->result = thread->start_routine(thread->arg);
}

static av_always_inline int pthread_create(pthread_t *thread,
                                           const pthread_attr_t *attr,
                                           void *(*start_routine)(void*),
                                           void *arg)
{
    thread->start_routine = start_routine;
    thread->arg = arg;
    thread->result = NULL;

    thread->tid = _beginthread(thread_entry, NULL, 1024 * 1024, thread);

    return 0;
}

static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
{
    DosWaitThread(&thread.tid, DCWW_WAIT);

    if (value_ptr)
        *value_ptr = thread.result;

    return 0;
}

static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex,
                                               const pthread_mutexattr_t *attr)
{
    _fmutex_create(mutex, 0);

    return 0;
}

static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
{
    _fmutex_close(mutex);

    return 0;
}

static av_always_inline int pthread_mutex_lock(pthread_mutex_t *mutex)
{
    _fmutex_request(mutex, 0);

    return 0;
}

static av_always_inline int pthread_mutex_unlock(pthread_mutex_t *mutex)
{
    _fmutex_release(mutex);

    return 0;
}

static av_always_inline int pthread_cond_init(pthread_cond_t *cond,
                                              const pthread_condattr_t *attr)
{
    DosCreateEventSem(NULL, &cond->event_sem, DCE_POSTONE, FALSE);
    DosCreateEventSem(NULL, &cond->ack_sem, DCE_POSTONE, FALSE);

    cond->wait_count = 0;

    return 0;
}

static av_always_inline int pthread_cond_destroy(pthread_cond_t *cond)
{
    DosCloseEventSem(cond->event_sem);
    DosCloseEventSem(cond->ack_sem);

    return 0;
}

static av_always_inline int pthread_cond_signal(pthread_cond_t *cond)
{
    if (!__atomic_cmpxchg32(&cond->wait_count, 0, 0)) {
        DosPostEventSem(cond->event_sem);
        DosWaitEventSem(cond->ack_sem, SEM_INDEFINITE_WAIT);
    }

    return 0;
}

static av_always_inline int pthread_cond_broadcast(pthread_cond_t *cond)
{
    while (!__atomic_cmpxchg32(&cond->wait_count, 0, 0))
        pthread_cond_signal(cond);

    return 0;
}

static av_always_inline int pthread_cond_wait(pthread_cond_t *cond,
                                              pthread_mutex_t *mutex)
{
    __atomic_increment(&cond->wait_count);

    pthread_mutex_unlock(mutex);

    DosWaitEventSem(cond->event_sem, SEM_INDEFINITE_WAIT);

    __atomic_decrement(&cond->wait_count);

    DosPostEventSem(cond->ack_sem);

    pthread_mutex_lock(mutex);

    return 0;
}

static av_always_inline int pthread_once(pthread_once_t *once_control,
                                         void (*init_routine)(void))
{
    if (!once_control->done)
    {
        _fmutex_request(&once_control->mtx, 0);

        if (!once_control->done)
        {
            init_routine();

            once_control->done = 1;
        }

        _fmutex_release(&once_control->mtx);
    }

    return 0;
}
#endif /* COMPAT_OS2THREADS_H */
OpenPOWER on IntegriCloud