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- /*****************************************************************************
- * threadpool.c: thread pooling
- *****************************************************************************
- * Copyright (C) 2010-2018 x264 project
- *
- * Authors: Steven Walters <kemuri9@gmail.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
- *
- * This program is also available under a commercial proprietary license.
- * For more information, contact us at licensing@x264.com.
- *****************************************************************************/
- #include "common.h"
- typedef struct
- {
- void *(*func)(void *);
- void *arg;
- void *ret;
- } x264_threadpool_job_t;
- struct x264_threadpool_t
- {
- volatile int exit;
- int threads;
- x264_pthread_t *thread_handle;
- void (*init_func)(void *);
- void *init_arg;
- /* requires a synchronized list structure and associated methods,
- so use what is already implemented for frames */
- x264_sync_frame_list_t uninit; /* list of jobs that are awaiting use */
- x264_sync_frame_list_t run; /* list of jobs that are queued for processing by the pool */
- x264_sync_frame_list_t done; /* list of jobs that have finished processing */
- };
- static void *threadpool_thread_internal( x264_threadpool_t *pool )
- {
- if( pool->init_func )
- pool->init_func( pool->init_arg );
- while( !pool->exit )
- {
- x264_threadpool_job_t *job = NULL;
- x264_pthread_mutex_lock( &pool->run.mutex );
- while( !pool->exit && !pool->run.i_size )
- x264_pthread_cond_wait( &pool->run.cv_fill, &pool->run.mutex );
- if( pool->run.i_size )
- {
- job = (void*)x264_frame_shift( pool->run.list );
- pool->run.i_size--;
- }
- x264_pthread_mutex_unlock( &pool->run.mutex );
- if( !job )
- continue;
- job->ret = job->func( job->arg );
- x264_sync_frame_list_push( &pool->done, (void*)job );
- }
- return NULL;
- }
- static void *threadpool_thread( x264_threadpool_t *pool )
- {
- return (void*)x264_stack_align( threadpool_thread_internal, pool );
- }
- int x264_threadpool_init( x264_threadpool_t **p_pool, int threads,
- void (*init_func)(void *), void *init_arg )
- {
- if( threads <= 0 )
- return -1;
- if( x264_threading_init() < 0 )
- return -1;
- x264_threadpool_t *pool;
- CHECKED_MALLOCZERO( pool, sizeof(x264_threadpool_t) );
- *p_pool = pool;
- pool->init_func = init_func;
- pool->init_arg = init_arg;
- pool->threads = threads;
- CHECKED_MALLOC( pool->thread_handle, pool->threads * sizeof(x264_pthread_t) );
- if( x264_sync_frame_list_init( &pool->uninit, pool->threads ) ||
- x264_sync_frame_list_init( &pool->run, pool->threads ) ||
- x264_sync_frame_list_init( &pool->done, pool->threads ) )
- goto fail;
- for( int i = 0; i < pool->threads; i++ )
- {
- x264_threadpool_job_t *job;
- CHECKED_MALLOC( job, sizeof(x264_threadpool_job_t) );
- x264_sync_frame_list_push( &pool->uninit, (void*)job );
- }
- for( int i = 0; i < pool->threads; i++ )
- if( x264_pthread_create( pool->thread_handle+i, NULL, (void*)threadpool_thread, pool ) )
- goto fail;
- return 0;
- fail:
- return -1;
- }
- void x264_threadpool_run( x264_threadpool_t *pool, void *(*func)(void *), void *arg )
- {
- x264_threadpool_job_t *job = (void*)x264_sync_frame_list_pop( &pool->uninit );
- job->func = func;
- job->arg = arg;
- x264_sync_frame_list_push( &pool->run, (void*)job );
- }
- void *x264_threadpool_wait( x264_threadpool_t *pool, void *arg )
- {
- x264_pthread_mutex_lock( &pool->done.mutex );
- while( 1 )
- {
- for( int i = 0; i < pool->done.i_size; i++ )
- if( ((x264_threadpool_job_t*)pool->done.list[i])->arg == arg )
- {
- x264_threadpool_job_t *job = (void*)x264_frame_shift( pool->done.list+i );
- pool->done.i_size--;
- x264_pthread_mutex_unlock( &pool->done.mutex );
- void *ret = job->ret;
- x264_sync_frame_list_push( &pool->uninit, (void*)job );
- return ret;
- }
- x264_pthread_cond_wait( &pool->done.cv_fill, &pool->done.mutex );
- }
- }
- static void threadpool_list_delete( x264_sync_frame_list_t *slist )
- {
- for( int i = 0; slist->list[i]; i++ )
- {
- x264_free( slist->list[i] );
- slist->list[i] = NULL;
- }
- x264_sync_frame_list_delete( slist );
- }
- void x264_threadpool_delete( x264_threadpool_t *pool )
- {
- x264_pthread_mutex_lock( &pool->run.mutex );
- pool->exit = 1;
- x264_pthread_cond_broadcast( &pool->run.cv_fill );
- x264_pthread_mutex_unlock( &pool->run.mutex );
- for( int i = 0; i < pool->threads; i++ )
- x264_pthread_join( pool->thread_handle[i], NULL );
- threadpool_list_delete( &pool->uninit );
- threadpool_list_delete( &pool->run );
- threadpool_list_delete( &pool->done );
- x264_free( pool->thread_handle );
- x264_free( pool );
- }
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