2 * Copyright (c) 2004 Roman Shaposhnik.
4 * Many thanks to Steven M. Schultz for providing clever ideas and
5 * to Michael Niedermayer <michaelni@gmx.at> for writing initial
8 * This file is part of FFmpeg.
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 typedef int (action_t)(AVCodecContext *c, void *arg);
30 typedef struct ThreadContext {
38 pthread_cond_t last_job_cond;
39 pthread_cond_t current_job_cond;
40 pthread_mutex_t current_job_lock;
45 static void* attribute_align_arg worker(void *v)
47 AVCodecContext *avctx = v;
48 ThreadContext *c = avctx->thread_opaque;
49 int our_job = c->job_count;
50 int thread_count = avctx->thread_count;
53 pthread_mutex_lock(&c->current_job_lock);
54 self_id = c->current_job++;
56 while (our_job >= c->job_count) {
57 if (c->current_job == thread_count + c->job_count)
58 pthread_cond_signal(&c->last_job_cond);
60 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
64 pthread_mutex_unlock(&c->current_job_lock);
68 pthread_mutex_unlock(&c->current_job_lock);
70 c->rets[our_job%c->rets_count] = c->func(avctx, c->args[our_job]);
72 pthread_mutex_lock(&c->current_job_lock);
73 our_job = c->current_job++;
77 static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
79 pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
80 pthread_mutex_unlock(&c->current_job_lock);
83 void avcodec_thread_free(AVCodecContext *avctx)
85 ThreadContext *c = avctx->thread_opaque;
88 pthread_mutex_lock(&c->current_job_lock);
90 pthread_cond_broadcast(&c->current_job_cond);
91 pthread_mutex_unlock(&c->current_job_lock);
93 for (i=0; i<avctx->thread_count; i++)
94 pthread_join(c->workers[i], NULL);
96 pthread_mutex_destroy(&c->current_job_lock);
97 pthread_cond_destroy(&c->current_job_cond);
98 pthread_cond_destroy(&c->last_job_cond);
100 av_freep(&avctx->thread_opaque);
103 int avcodec_thread_execute(AVCodecContext *avctx, action_t* func, void **arg, int *ret, int job_count)
105 ThreadContext *c= avctx->thread_opaque;
111 pthread_mutex_lock(&c->current_job_lock);
113 c->current_job = avctx->thread_count;
114 c->job_count = job_count;
119 c->rets_count = job_count;
121 c->rets = &dummy_ret;
124 pthread_cond_broadcast(&c->current_job_cond);
126 avcodec_thread_park_workers(c, avctx->thread_count);
131 int avcodec_thread_init(AVCodecContext *avctx, int thread_count)
136 c = av_mallocz(sizeof(ThreadContext));
140 c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
146 avctx->thread_opaque = c;
147 avctx->thread_count = thread_count;
151 pthread_cond_init(&c->current_job_cond, NULL);
152 pthread_cond_init(&c->last_job_cond, NULL);
153 pthread_mutex_init(&c->current_job_lock, NULL);
154 pthread_mutex_lock(&c->current_job_lock);
155 for (i=0; i<thread_count; i++) {
156 if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
157 avctx->thread_count = i;
158 pthread_mutex_unlock(&c->current_job_lock);
159 avcodec_thread_free(avctx);
164 avcodec_thread_park_workers(c, thread_count);
166 avctx->execute = avcodec_thread_execute;