mirror of https://github.com/FFmpeg/FFmpeg.git
Relevant BeOS variants support pthreads, so there is no need to maintain the beos-native threads interface. Originally committed as revision 23729 to svn://svn.ffmpeg.org/ffmpeg/trunkoldabi
Måns Rullgård
15 years ago
parent
8fbd4f51a8
commit
9f342dabc6
3 changed files with 0 additions and 186 deletions
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/*
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* Copyright (c) 2004 François Revol <revol@free.fr> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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//#define DEBUG
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#include "avcodec.h" |
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#include <OS.h> |
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typedef struct ThreadContext{ |
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AVCodecContext *avctx; |
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thread_id thread; |
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sem_id work_sem; |
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sem_id done_sem; |
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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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}ThreadContext; |
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// it's odd Be never patented that :D
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struct benaphore { |
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vint32 atom; |
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sem_id sem; |
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}; |
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static inline int lock_ben(struct benaphore *ben) |
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{ |
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if (atomic_add(&ben->atom, 1) > 0) |
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return acquire_sem(ben->sem); |
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return B_OK; |
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} |
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static inline int unlock_ben(struct benaphore *ben) |
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{ |
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if (atomic_add(&ben->atom, -1) > 1) |
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return release_sem(ben->sem); |
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return B_OK; |
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} |
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static struct benaphore av_thread_lib_ben; |
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static int32 ff_thread_func(void *v){ |
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ThreadContext *c= v; |
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for(;;){ |
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//printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
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acquire_sem(c->work_sem); |
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//printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
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if(c->func) |
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c->ret= c->func(c->avctx, c->arg); |
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else |
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return 0; |
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//printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
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release_sem(c->done_sem); |
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} |
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return B_OK; |
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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 do not 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; |
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int32 ret; |
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for(i=0; i<s->thread_count; i++){ |
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c[i].func= NULL; |
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release_sem(c[i].work_sem); |
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wait_for_thread(c[i].thread, &ret); |
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if(c[i].work_sem > B_OK) delete_sem(c[i].work_sem); |
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if(c[i].done_sem > B_OK) delete_sem(c[i].done_sem); |
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} |
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av_freep(&s->thread_opaque); |
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} |
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static int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){ |
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ThreadContext *c= s->thread_opaque; |
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int i; |
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assert(s == c->avctx); |
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assert(count <= s->thread_count); |
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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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for(i=0; i<count; i++){ |
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c[i].arg= (char*)arg + i*size; |
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c[i].func= func; |
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c[i].ret= 12345; |
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release_sem(c[i].work_sem); |
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} |
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for(i=0; i<count; i++){ |
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acquire_sem(c[i].done_sem); |
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c[i].func= NULL; |
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if(ret) ret[i]= c[i].ret; |
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} |
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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 i; |
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ThreadContext *c; |
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s->thread_count= thread_count; |
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if (thread_count <= 1) |
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return 0; |
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assert(!s->thread_opaque); |
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c= av_mallocz(sizeof(ThreadContext)*thread_count); |
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s->thread_opaque= c; |
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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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c[i].avctx= s; |
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if((c[i].work_sem = create_sem(0, "ff work sem")) < B_OK) |
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goto fail; |
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if((c[i].done_sem = create_sem(0, "ff done sem")) < B_OK) |
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goto fail; |
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//printf("create thread %d\n", i); fflush(stdout);
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c[i].thread = spawn_thread(ff_thread_func, "libavcodec thread", B_LOW_PRIORITY, &c[i] ); |
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if( c[i].thread < B_OK ) goto fail; |
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resume_thread(c[i].thread ); |
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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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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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/* provide a mean to serialize calls to avcodec_*() for thread safety. */ |
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int avcodec_thread_lock_lib(void) |
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{ |
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return lock_ben(&av_thread_lib_ben); |
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} |
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int avcodec_thread_unlock_lib(void) |
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{ |
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return unlock_ben(&av_thread_lib_ben); |
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} |
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/* our versions of _init and _fini (which are called by those actually from crt.o) */ |
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void initialize_after(void) |
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{ |
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av_thread_lib_ben.atom = 0; |
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av_thread_lib_ben.sem = create_sem(0, "libavcodec benaphore"); |
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} |
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void uninitialize_before(void) |
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{ |
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delete_sem(av_thread_lib_ben.sem); |
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} |
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