threadprogress.c (2614B)
1 /* 2 * Copyright (c) 2022 Andreas Rheinhardt <andreas.rheinhardt@outlook.com> 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21 #include <limits.h> 22 #include <stdatomic.h> 23 24 #include "pthread_internal.h" 25 #include "threadprogress.h" 26 #include "libavutil/attributes.h" 27 #include "libavutil/thread.h" 28 29 DEFINE_OFFSET_ARRAY(ThreadProgress, thread_progress, init, 30 (offsetof(ThreadProgress, progress_mutex)), 31 (offsetof(ThreadProgress, progress_cond))); 32 33 av_cold int ff_thread_progress_init(ThreadProgress *pro, int init_mode) 34 { 35 atomic_init(&pro->progress, init_mode ? -1 : INT_MAX); 36 #if HAVE_THREADS 37 if (init_mode) 38 return ff_pthread_init(pro, thread_progress_offsets); 39 #endif 40 pro->init = init_mode; 41 return 0; 42 } 43 44 av_cold void ff_thread_progress_destroy(ThreadProgress *pro) 45 { 46 #if HAVE_THREADS 47 ff_pthread_free(pro, thread_progress_offsets); 48 #else 49 pro->init = 0; 50 #endif 51 } 52 53 void ff_thread_progress_report(ThreadProgress *pro, int n) 54 { 55 if (atomic_load_explicit(&pro->progress, memory_order_relaxed) >= n) 56 return; 57 58 ff_mutex_lock(&pro->progress_mutex); 59 atomic_store_explicit(&pro->progress, n, memory_order_release); 60 ff_cond_broadcast(&pro->progress_cond); 61 ff_mutex_unlock(&pro->progress_mutex); 62 } 63 64 void ff_thread_progress_await(const ThreadProgress *pro_c, int n) 65 { 66 /* Casting const away here is safe, because we only read from progress 67 * and will leave pro_c in the same state upon leaving the function 68 * as it had at the beginning. */ 69 ThreadProgress *pro = (ThreadProgress*)pro_c; 70 71 if (atomic_load_explicit(&pro->progress, memory_order_acquire) >= n) 72 return; 73 74 ff_mutex_lock(&pro->progress_mutex); 75 while (atomic_load_explicit(&pro->progress, memory_order_relaxed) < n) 76 ff_cond_wait(&pro->progress_cond, &pro->progress_mutex); 77 ff_mutex_unlock(&pro->progress_mutex); 78 }