| /* |
| * 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); |
| } |