early-access version 1432

externals/ffmpeg/compat/os2threads.h

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+/*
+ * 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
+#define INCL_DOSERRORS
+#include <os2.h>
+
+#undef __STRICT_ANSI__          /* for _beginthread() */
+#include <stdlib.h>
+#include <time.h>
+
+#include <sys/builtin.h>
+#include <sys/fmutex.h>
+
+#include "libavutil/attributes.h"
+#include "libavutil/common.h"
+#include "libavutil/time.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_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;
+    ULONG t = av_clip64(abs_milli - av_gettime() / 1000, 0, ULONG_MAX);
+
+    __atomic_increment(&cond->wait_count);
+
+    pthread_mutex_unlock(mutex);
+
+    APIRET ret = DosWaitEventSem(cond->event_sem, t);
+
+    __atomic_decrement(&cond->wait_count);
+
+    DosPostEventSem(cond->ack_sem);
+
+    pthread_mutex_lock(mutex);
+
+    return (ret == ERROR_TIMEOUT) ? ETIMEDOUT : 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 */