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* reimplementation using mutexes and condition variables.
Originally committed as revision 3138 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Roman Shaposhnik
parent
ffc0ef960b
commit
a8eb52a8c3
@ -1,5 +1,9 @@
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/*
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* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2004 Roman Shaposhnik.
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*
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* Many thanks to Steven M. Schultz for providing clever ideas and
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* to Michael Niedermayer <michaelni@gmx.at> for writing initial
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* implementation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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@ -16,186 +20,149 @@
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <semaphore.h>
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#include <pthread.h>
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//#define DEBUG
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#include "avcodec.h"
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#include "common.h"
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typedef struct JobContext{
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sem_t available_sem;
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int assigned;
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int (*func)(AVCodecContext *c, void *arg);
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void *arg;
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int ret;
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}JobContext;
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typedef int (action_t)(AVCodecContext *c, void *arg);
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typedef struct WorkerContext{
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AVCodecContext *avctx;
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pthread_t thread;
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int start_index;
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sem_t work_sem;
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sem_t done_sem;
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}WorkerContext;
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typedef struct ThreadContext{
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WorkerContext *worker;
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JobContext *job;
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typedef struct ThreadContext {
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pthread_t *workers;
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action_t *func;
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void **args;
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int *rets;
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int rets_count;
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int job_count;
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int allocated_job_count;
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}ThreadContext;
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pthread_cond_t last_job_cond;
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pthread_cond_t current_job_cond;
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pthread_mutex_t current_job_lock;
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int current_job;
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int done;
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} ThreadContext;
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static void * thread_func(void *v){
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WorkerContext *w= v;
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ThreadContext *c= w->avctx->thread_opaque;
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int i;
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static void* worker(void *v)
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{
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AVCodecContext *avctx = v;
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ThreadContext *c = avctx->thread_opaque;
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int our_job = c->job_count;
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int thread_count = avctx->thread_count;
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int self_id;
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for(;;){
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//av_log(w->avctx, AV_LOG_DEBUG, "thread_func %X enter wait\n", (int)v);
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sem_wait(&w->work_sem);
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//av_log(w->avctx, AV_LOG_DEBUG, "thread_func %X after wait\n", (int)v);
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if(c->job_count == 0)
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break;
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for(i=0; i<c->job_count; i++){
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int index= (i + w->start_index) % c->job_count;
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JobContext *j= &c->job[index];
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//av_log(w->avctx, AV_LOG_DEBUG, "thread_func %X first check of %d\n", (int)v, index);
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if(j->assigned) continue; //unsynced check, if != 0 it is already given to another worker, it never becomes available before the next execute() call so this should be safe
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pthread_mutex_lock(&c->current_job_lock);
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self_id = c->current_job++;
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for (;;){
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while (our_job >= c->job_count) {
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if (c->current_job == thread_count + c->job_count)
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pthread_cond_signal(&c->last_job_cond);
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//av_log(w->avctx, AV_LOG_DEBUG, "thread_func %X second check of %d\n", (int)v, index);
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if(sem_trywait(&j->available_sem) == 0){
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j->assigned=1;
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j->ret= j->func(w->avctx, j->arg);
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//av_log(w->avctx, AV_LOG_DEBUG, "thread_func %X done %d\n", (int)v, index);
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}
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}
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//av_log(w->avctx, AV_LOG_DEBUG, "thread_func %X complete\n", (int)v);
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sem_post(&w->done_sem);
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pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
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our_job = self_id;
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if (c->done) {
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pthread_mutex_unlock(&c->current_job_lock);
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return NULL;
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}
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}
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pthread_mutex_unlock(&c->current_job_lock);
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c->rets[our_job%c->rets_count] = c->func(avctx, c->args[our_job]);
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pthread_mutex_lock(&c->current_job_lock);
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our_job = c->current_job++;
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}
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return NULL;
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}
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/**
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* free what has been allocated by avcodec_thread_init().
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* must be called after decoding has finished, especially dont call while avcodec_thread_execute() is running
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*/
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void avcodec_thread_free(AVCodecContext *s){
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ThreadContext *c= s->thread_opaque;
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int i, val;
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for(i=0; i<c->allocated_job_count; i++){
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sem_getvalue(&c->job[i].available_sem, &val); assert(val == 0);
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sem_destroy(&c->job[i].available_sem);
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}
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c->job_count= 0;
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for(i=0; i<s->thread_count; i++){
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sem_getvalue(&c->worker[i].work_sem, &val); assert(val == 0);
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sem_getvalue(&c->worker[i].done_sem, &val); assert(val == 0);
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sem_post(&c->worker[i].work_sem);
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pthread_join(c->worker[i].thread, NULL);
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sem_destroy(&c->worker[i].work_sem);
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sem_destroy(&c->worker[i].done_sem);
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}
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av_freep(&c->job);
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av_freep(&c->worker);
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av_freep(&s->thread_opaque);
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static always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
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{
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pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
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pthread_mutex_unlock(&c->current_job_lock);
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}
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int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int job_count){
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ThreadContext *c= s->thread_opaque;
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int i, val;
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void avcodec_thread_free(AVCodecContext *avctx)
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{
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ThreadContext *c = avctx->thread_opaque;
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int i;
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assert(s == c->avctx);
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if(job_count > c->allocated_job_count){
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c->job= av_realloc(c->job, job_count*sizeof(JobContext));
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pthread_mutex_lock(&c->current_job_lock);
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c->done = 1;
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pthread_cond_signal(&c->current_job_cond);
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pthread_mutex_unlock(&c->current_job_lock);
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for(i=c->allocated_job_count; i<job_count; i++){
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memset(&c->job[i], 0, sizeof(JobContext));
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c->allocated_job_count++;
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for (i=0; i<avctx->thread_count; i++)
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pthread_join(c->workers[i], NULL);
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if(sem_init(&c->job[i].available_sem, 0, 0))
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return -1;
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}
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}
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c->job_count= job_count;
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pthread_mutex_destroy(&c->current_job_lock);
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pthread_cond_destroy(&c->current_job_cond);
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pthread_cond_destroy(&c->last_job_cond);
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av_free(c->workers);
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av_freep(c);
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}
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int avcodec_thread_execute(AVCodecContext *avctx, action_t* func, void **arg, int *ret, int job_count)
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{
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ThreadContext *c= avctx->thread_opaque;
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int dummy_ret;
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if (job_count <= 0)
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return 0;
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/* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
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pthread_mutex_lock(&c->current_job_lock);
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for(i=0; i<job_count; i++){
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sem_getvalue(&c->job[i].available_sem, &val); assert(val == 0);
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c->job[i].arg= arg[i];
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c->job[i].func= func;
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c->job[i].ret= 12345;
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c->job[i].assigned= 0;
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sem_post(&c->job[i].available_sem);
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}
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for(i=0; i<s->thread_count && i<job_count; i++){
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sem_getvalue(&c->worker[i].work_sem, &val); assert(val == 0);
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sem_getvalue(&c->worker[i].done_sem, &val); assert(val == 0);
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c->worker[i].start_index= (i + job_count/2)/job_count;
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//av_log(s, AV_LOG_DEBUG, "start worker %d\n", i);
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sem_post(&c->worker[i].work_sem);
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}
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for(i=0; i<s->thread_count && i<job_count; i++){
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//av_log(s, AV_LOG_DEBUG, "wait for worker %d\n", i);
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sem_wait(&c->worker[i].done_sem);
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sem_getvalue(&c->worker[i].work_sem, &val); assert(val == 0);
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sem_getvalue(&c->worker[i].done_sem, &val); assert(val == 0);
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}
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for(i=0; i<job_count; i++){
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sem_getvalue(&c->job[i].available_sem, &val); assert(val == 0);
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c->job[i].func= NULL;
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if(ret) ret[i]= c->job[i].ret;
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c->current_job = avctx->thread_count;
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c->job_count = job_count;
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c->args = arg;
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c->func = func;
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if (ret) {
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c->rets = ret;
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c->rets_count = job_count;
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} else {
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c->rets = &dummy_ret;
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c->rets_count = 1;
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}
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pthread_cond_broadcast(&c->current_job_cond);
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avcodec_thread_park_workers(c, avctx->thread_count);
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return 0;
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}
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int avcodec_thread_init(AVCodecContext *s, int thread_count){
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int avcodec_thread_init(AVCodecContext *avctx, int thread_count)
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{
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int i;
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ThreadContext *c;
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WorkerContext *worker;
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s->thread_count= thread_count;
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assert(!s->thread_opaque);
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c= av_mallocz(sizeof(ThreadContext));
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worker= av_mallocz(sizeof(WorkerContext)*thread_count);
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s->thread_opaque= c;
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c->worker= worker;
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for(i=0; i<thread_count; i++){
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//printf("init semaphors %d\n", i); fflush(stdout);
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worker[i].avctx= s;
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if(sem_init(&worker[i].work_sem, 0, 0))
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goto fail;
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if(sem_init(&worker[i].done_sem, 0, 0))
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goto fail;
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//printf("create thread %d\n", i); fflush(stdout);
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if(pthread_create(&worker[i].thread, NULL, thread_func, &worker[i]))
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goto fail;
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c = av_mallocz(sizeof(ThreadContext));
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if (!c)
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return -1;
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c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
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if (!c->workers) {
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av_free(c);
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return -1;
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}
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//printf("init done\n"); fflush(stdout);
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s->execute= avcodec_thread_execute;
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avctx->thread_opaque = c;
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avctx->thread_count = thread_count;
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c->current_job = 0;
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c->job_count = 0;
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c->done = 0;
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pthread_cond_init(&c->current_job_cond, NULL);
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pthread_cond_init(&c->last_job_cond, NULL);
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pthread_mutex_init(&c->current_job_lock, NULL);
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pthread_mutex_lock(&c->current_job_lock);
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for (i=0; i<thread_count; i++) {
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if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
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avctx->thread_count = i;
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pthread_mutex_unlock(&c->current_job_lock);
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avcodec_thread_free(avctx);
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return -1;
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}
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}
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avcodec_thread_park_workers(c, thread_count);
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avctx->execute = avcodec_thread_execute;
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return 0;
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fail:
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avcodec_thread_free(s);
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return -1;
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}
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