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
30 typedef int (action_t)(AVCodecContext *c, void *arg);
32 typedef struct ThreadContext {
40 pthread_cond_t last_job_cond;
41 pthread_cond_t current_job_cond;
42 pthread_mutex_t current_job_lock;
47 static void* worker(void *v)
49 AVCodecContext *avctx = v;
50 ThreadContext *c = avctx->thread_opaque;
51 int our_job = c->job_count;
52 int thread_count = avctx->thread_count;
55 pthread_mutex_lock(&c->current_job_lock);
56 self_id = c->current_job++;
58 while (our_job >= c->job_count) {
59 if (c->current_job == thread_count + c->job_count)
60 pthread_cond_signal(&c->last_job_cond);
62 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
66 pthread_mutex_unlock(&c->current_job_lock);
70 pthread_mutex_unlock(&c->current_job_lock);
72 c->rets[our_job%c->rets_count] = c->func(avctx, c->args[our_job]);
74 pthread_mutex_lock(&c->current_job_lock);
75 our_job = c->current_job++;
79 static always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
81 pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
82 pthread_mutex_unlock(&c->current_job_lock);
85 void avcodec_thread_free(AVCodecContext *avctx)
87 ThreadContext *c = avctx->thread_opaque;
90 pthread_mutex_lock(&c->current_job_lock);
92 pthread_cond_broadcast(&c->current_job_cond);
93 pthread_mutex_unlock(&c->current_job_lock);
95 for (i=0; i<avctx->thread_count; i++)
96 pthread_join(c->workers[i], NULL);
98 pthread_mutex_destroy(&c->current_job_lock);
99 pthread_cond_destroy(&c->current_job_cond);
100 pthread_cond_destroy(&c->last_job_cond);
105 int avcodec_thread_execute(AVCodecContext *avctx, action_t* func, void **arg, int *ret, int job_count)
107 ThreadContext *c= avctx->thread_opaque;
113 pthread_mutex_lock(&c->current_job_lock);
115 c->current_job = avctx->thread_count;
116 c->job_count = job_count;
121 c->rets_count = job_count;
123 c->rets = &dummy_ret;
126 pthread_cond_broadcast(&c->current_job_cond);
128 avcodec_thread_park_workers(c, avctx->thread_count);
133 int avcodec_thread_init(AVCodecContext *avctx, int thread_count)
138 c = av_mallocz(sizeof(ThreadContext));
142 c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
148 avctx->thread_opaque = c;
149 avctx->thread_count = thread_count;
153 pthread_cond_init(&c->current_job_cond, NULL);
154 pthread_cond_init(&c->last_job_cond, NULL);
155 pthread_mutex_init(&c->current_job_lock, NULL);
156 pthread_mutex_lock(&c->current_job_lock);
157 for (i=0; i<thread_count; i++) {
158 if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
159 avctx->thread_count = i;
160 pthread_mutex_unlock(&c->current_job_lock);
161 avcodec_thread_free(avctx);
166 avcodec_thread_park_workers(c, thread_count);
168 avctx->execute = avcodec_thread_execute;