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/*
* Copyright (c) 2022 Andreas Rheinhardt <andreas.rheinhardt@outlook.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
*/
#include <limits.h>
#include <stdatomic.h>
#include "pthread_internal.h"
#include "threadprogress.h"
#include "libavutil/attributes.h"
#include "libavutil/thread.h"
DEFINE_OFFSET_ARRAY(ThreadProgress, thread_progress, init,
(offsetof(ThreadProgress, progress_mutex)),
(offsetof(ThreadProgress, progress_cond)));
av_cold int ff_thread_progress_init(ThreadProgress *pro, int init_mode)
{
atomic_init(&pro->progress, init_mode ? -1 : INT_MAX);
#if HAVE_THREADS
if (init_mode)
return ff_pthread_init(pro, thread_progress_offsets);
#endif
pro->init = init_mode;
return 0;
}
av_cold void ff_thread_progress_destroy(ThreadProgress *pro)
{
#if HAVE_THREADS
ff_pthread_free(pro, thread_progress_offsets);
#else
pro->init = 0;
#endif
}
void ff_thread_progress_report(ThreadProgress *pro, int n)
{
if (atomic_load_explicit(&pro->progress, memory_order_relaxed) >= n)
return;
atomic_store_explicit(&pro->progress, n, memory_order_release);
ff_mutex_lock(&pro->progress_mutex);
ff_cond_broadcast(&pro->progress_cond);
ff_mutex_unlock(&pro->progress_mutex);
}
void ff_thread_progress_await(const ThreadProgress *pro_c, int n)
{
/* Casting const away here is safe, because we only read from progress
* and will leave pro_c in the same state upon leaving the function
* as it had at the beginning. */
ThreadProgress *pro = (ThreadProgress*)pro_c;
if (atomic_load_explicit(&pro->progress, memory_order_acquire) >= n)
return;
ff_mutex_lock(&pro->progress_mutex);
while (atomic_load_explicit(&pro->progress, memory_order_relaxed) < n)
ff_cond_wait(&pro->progress_cond, &pro->progress_mutex);
ff_mutex_unlock(&pro->progress_mutex);
}
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