summaryrefslogtreecommitdiffstats
path: root/media/ffvpx/compat/w32pthreads.h
blob: 005d4e4757b4281d1b19a37eff1fe059019f8cb3 (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
/*
 * Copyright (C) 2010-2011 x264 project
 *
 * Authors: Steven Walters <kemuri9@gmail.com>
 *          Pegasys Inc. <http://www.pegasys-inc.com>
 *
 * 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
 * w32threads to pthreads wrapper
 */

#ifndef COMPAT_W32PTHREADS_H
#define COMPAT_W32PTHREADS_H

/* Build up a pthread-like API using underlying Windows API. Have only static
 * methods so as to not conflict with a potentially linked in pthread-win32
 * library.
 * As most functions here are used without checking return values,
 * only implement return values as necessary. */

#include <windows.h>
#include <process.h>
#include <time.h>

#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "libavutil/internal.h"
#include "libavutil/mem.h"
#include "libavutil/fftime.h"

typedef struct pthread_t {
    void *handle;
    void *(*func)(void* arg);
    void *arg;
    void *ret;
} pthread_t;

/* use light weight mutex/condition variable API for Windows Vista and later */
typedef SRWLOCK pthread_mutex_t;
typedef CONDITION_VARIABLE pthread_cond_t;

#define PTHREAD_MUTEX_INITIALIZER SRWLOCK_INIT
#define PTHREAD_COND_INITIALIZER CONDITION_VARIABLE_INIT

#define InitializeCriticalSection(x) InitializeCriticalSectionEx(x, 0, 0)
#define WaitForSingleObject(a, b) WaitForSingleObjectEx(a, b, FALSE)

#define PTHREAD_CANCEL_ENABLE 1
#define PTHREAD_CANCEL_DISABLE 0

#if HAVE_WINRT
#define THREADFUNC_RETTYPE DWORD
#else
#define THREADFUNC_RETTYPE unsigned
#endif

static av_unused THREADFUNC_RETTYPE
__stdcall attribute_align_arg win32thread_worker(void *arg)
{
    pthread_t *h = (pthread_t*)arg;
    h->ret = h->func(h->arg);
    return 0;
}

static av_unused int pthread_create(pthread_t *thread, const void *unused_attr,
                                    void *(*start_routine)(void*), void *arg)
{
    thread->func   = start_routine;
    thread->arg    = arg;
#if HAVE_WINRT
    thread->handle = (void*)CreateThread(NULL, 0, win32thread_worker, thread,
                                           0, NULL);
#else
    thread->handle = (void*)_beginthreadex(NULL, 0, win32thread_worker, thread,
                                           0, NULL);
#endif
    return !thread->handle;
}

static av_unused int pthread_join(pthread_t thread, void **value_ptr)
{
    DWORD ret = WaitForSingleObject(thread.handle, INFINITE);
    if (ret != WAIT_OBJECT_0) {
        if (ret == WAIT_ABANDONED)
            return EINVAL;
        else
            return EDEADLK;
    }
    if (value_ptr)
        *value_ptr = thread.ret;
    CloseHandle(thread.handle);
    return 0;
}

static inline int pthread_mutex_init(pthread_mutex_t *m, void* attr)
{
    InitializeSRWLock(m);
    return 0;
}
static inline int pthread_mutex_destroy(pthread_mutex_t *m)
{
    /* Unlocked SWR locks use no resources */
    return 0;
}
static inline int pthread_mutex_lock(pthread_mutex_t *m)
{
    AcquireSRWLockExclusive(m);
    return 0;
}
static inline int pthread_mutex_unlock(pthread_mutex_t *m)
{
    ReleaseSRWLockExclusive(m);
    return 0;
}

typedef INIT_ONCE pthread_once_t;
#define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT

static av_unused int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
{
    BOOL pending = FALSE;
    InitOnceBeginInitialize(once_control, 0, &pending, NULL);
    if (pending)
        init_routine();
    InitOnceComplete(once_control, 0, NULL);
    return 0;
}

static inline int pthread_cond_init(pthread_cond_t *cond, const void *unused_attr)
{
    InitializeConditionVariable(cond);
    return 0;
}

/* native condition variables do not destroy */
static inline int pthread_cond_destroy(pthread_cond_t *cond)
{
    return 0;
}

static inline int pthread_cond_broadcast(pthread_cond_t *cond)
{
    WakeAllConditionVariable(cond);
    return 0;
}

static inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
    SleepConditionVariableSRW(cond, mutex, INFINITE, 0);
    return 0;
}

static inline int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
                                         const struct timespec *abstime)
{
    int64_t abs_milli = abstime->tv_sec * 1000LL + abstime->tv_nsec / 1000000;
    DWORD t = av_clip64(abs_milli - av_gettime() / 1000, 0, UINT32_MAX);

    if (!SleepConditionVariableSRW(cond, mutex, t, 0)) {
        DWORD err = GetLastError();
        if (err == ERROR_TIMEOUT)
            return ETIMEDOUT;
        else
            return EINVAL;
    }
    return 0;
}

static inline int pthread_cond_signal(pthread_cond_t *cond)
{
    WakeConditionVariable(cond);
    return 0;
}

static inline int pthread_setcancelstate(int state, int *oldstate)
{
    return 0;
}

#endif /* COMPAT_W32PTHREADS_H */