/* * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Slice multithreading support functions * @see doc/multithreading.txt */ #include "config.h" #if HAVE_PTHREADS #include <pthread.h> #elif HAVE_W32THREADS #include "compat/w32pthreads.h" #endif #include "avcodec.h" #include "internal.h" #include "pthread_internal.h" #include "thread.h" #include "libavutil/common.h" #include "libavutil/cpu.h" #include "libavutil/mem.h" typedef int (action_func)(AVCodecContext *c, void *arg); typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr); typedef struct SliceThreadContext { pthread_t *workers; action_func *func; action_func2 *func2; void *args; int *rets; int rets_count; int job_count; int job_size; pthread_cond_t last_job_cond; pthread_cond_t current_job_cond; pthread_mutex_t current_job_lock; unsigned current_execute; int current_job; int done; } SliceThreadContext; static void* attribute_align_arg worker(void *v) { AVCodecContext *avctx = v; SliceThreadContext *c = avctx->internal->thread_ctx; unsigned last_execute = 0; int our_job = c->job_count; int thread_count = avctx->thread_count; int self_id; pthread_mutex_lock(&c->current_job_lock); self_id = c->current_job++; for (;;){ while (our_job >= c->job_count) { if (c->current_job == thread_count + c->job_count) pthread_cond_signal(&c->last_job_cond); while (last_execute == c->current_execute && !c->done) pthread_cond_wait(&c->current_job_cond, &c->current_job_lock); last_execute = c->current_execute; our_job = self_id; if (c->done) { pthread_mutex_unlock(&c->current_job_lock); return NULL; } } pthread_mutex_unlock(&c->current_job_lock); c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size): c->func2(avctx, c->args, our_job, self_id); pthread_mutex_lock(&c->current_job_lock); our_job = c->current_job++; } } void ff_slice_thread_free(AVCodecContext *avctx) { SliceThreadContext *c = avctx->internal->thread_ctx; int i; pthread_mutex_lock(&c->current_job_lock); c->done = 1; pthread_cond_broadcast(&c->current_job_cond); pthread_mutex_unlock(&c->current_job_lock); for (i=0; i<avctx->thread_count; i++) pthread_join(c->workers[i], NULL); pthread_mutex_destroy(&c->current_job_lock); pthread_cond_destroy(&c->current_job_cond); pthread_cond_destroy(&c->last_job_cond); av_free(c->workers); av_freep(&avctx->internal->thread_ctx); } static av_always_inline void thread_park_workers(SliceThreadContext *c, int thread_count) { while (c->current_job != thread_count + c->job_count) pthread_cond_wait(&c->last_job_cond, &c->current_job_lock); pthread_mutex_unlock(&c->current_job_lock); } static int thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size) { SliceThreadContext *c = avctx->internal->thread_ctx; int dummy_ret; if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1) return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size); if (job_count <= 0) return 0; pthread_mutex_lock(&c->current_job_lock); c->current_job = avctx->thread_count; c->job_count = job_count; c->job_size = job_size; c->args = arg; c->func = func; if (ret) { c->rets = ret; c->rets_count = job_count; } else { c->rets = &dummy_ret; c->rets_count = 1; } c->current_execute++; pthread_cond_broadcast(&c->current_job_cond); thread_park_workers(c, avctx->thread_count); return 0; } static int thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count) { SliceThreadContext *c = avctx->internal->thread_ctx; c->func2 = func2; return thread_execute(avctx, NULL, arg, ret, job_count, 0); } int ff_slice_thread_init(AVCodecContext *avctx) { int i; SliceThreadContext *c; int thread_count = avctx->thread_count; #if HAVE_W32THREADS w32thread_init(); #endif if (!thread_count) { int nb_cpus = av_cpu_count(); av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus); // use number of cores + 1 as thread count if there is more than one if (nb_cpus > 1) thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS); else thread_count = avctx->thread_count = 1; } if (thread_count <= 1) { avctx->active_thread_type = 0; return 0; } c = av_mallocz(sizeof(SliceThreadContext)); if (!c) return -1; c->workers = av_mallocz(sizeof(pthread_t)*thread_count); if (!c->workers) { av_free(c); return -1; } avctx->internal->thread_ctx = c; c->current_job = 0; c->job_count = 0; c->job_size = 0; c->done = 0; pthread_cond_init(&c->current_job_cond, NULL); pthread_cond_init(&c->last_job_cond, NULL); pthread_mutex_init(&c->current_job_lock, NULL); pthread_mutex_lock(&c->current_job_lock); for (i=0; i<thread_count; i++) { if(pthread_create(&c->workers[i], NULL, worker, avctx)) { avctx->thread_count = i; pthread_mutex_unlock(&c->current_job_lock); ff_thread_free(avctx); return -1; } } thread_park_workers(c, thread_count); avctx->execute = thread_execute; avctx->execute2 = thread_execute2; return 0; }