libavcodec/os2thread.c

   1 /*
   2  * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20 //#define DEBUG
  21
  22 // Ported by Vlad Stelmahovsky
  23
  24 #include "avcodec.h"
  25
  26 #define INCL_DOS
  27 #define INCL_DOSERRORS
  28 #define INCL_DOSDEVIOCTL
  29 #include <os2.h>
  30
  31 typedef struct ThreadContext{
  32     AVCodecContext *avctx;
  33     int thread;
  34     HEV work_sem;
  35     HEV done_sem;
  36     int (*func)(AVCodecContext *c, void *arg);
  37     void *arg;
  38     int ret;
  39 }ThreadContext;
  40
  41
  42 void attribute_align_arg thread_func(void *v){
  43     ThreadContext *c= v;
  44
  45     for(;;){
  46         //printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
  47         DosWaitEventSem(c->work_sem, SEM_INDEFINITE_WAIT);
  48 //        WaitForSingleObject(c->work_sem, INFINITE);
  49 //printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
  50         if(c->func)
  51             c->ret= c->func(c->avctx, c->arg);
  52         else
  53             return;
  54         //printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
  55         DosPostEventSem(c->done_sem);
  56 //        ReleaseSemaphore(c->done_sem, 1, 0);
  57     }
  58
  59     return;
  60 }
  61
  62 /**
  63  * free what has been allocated by avcodec_thread_init().
  64  * must be called after decoding has finished, especially do not call while avcodec_thread_execute() is running
  65  */
  66 void avcodec_thread_free(AVCodecContext *s){
  67     ThreadContext *c= s->thread_opaque;
  68     int i;
  69
  70     for(i=0; i<s->thread_count; i++){
  71
  72         c[i].func= NULL;
  73         DosPostEventSem(c[i].work_sem);
  74         //        ReleaseSemaphore(c[i].work_sem, 1, 0);
  75         DosWaitThread((PTID)&c[i].thread,DCWW_WAIT);
  76 //        WaitForSingleObject(c[i].thread, INFINITE);
  77         if(c[i].work_sem) DosCloseEventSem(c[i].work_sem);//CloseHandle(c[i].work_sem);
  78         if(c[i].done_sem) DosCloseEventSem(c[i].done_sem);//CloseHandle(c[i].done_sem);
  79     }
  80
  81     av_freep(&s->thread_opaque);
  82 }
  83
  84 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
  85     ThreadContext *c= s->thread_opaque;
  86     int i;
  87
  88     assert(s == c->avctx);
  89     assert(count <= s->thread_count);
  90
  91     /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
  92
  93     for(i=0; i<count; i++){
  94
  95         c[i].arg= arg[i];
  96         c[i].func= func;
  97         c[i].ret= 12345;
  98
  99         DosPostEventSem(c[i].work_sem);
 100 //        ReleaseSemaphore(c[i].work_sem, 1, 0);
 101     }
 102     for(i=0; i<count; i++){
 103         DosWaitEventSem(c[i].done_sem,SEM_INDEFINITE_WAIT);
 104 //        WaitForSingleObject(c[i].done_sem, INFINITE);
 105
 106         c[i].func= NULL;
 107         if(ret) ret[i]= c[i].ret;
 108     }
 109     return 0;
 110 }
 111
 112 int avcodec_thread_init(AVCodecContext *s, int thread_count){
 113     int i;
 114     ThreadContext *c;
 115     uint32_t threadid;
 116
 117     s->thread_count= thread_count;
 118
 119     assert(!s->thread_opaque);
 120     c= av_mallocz(sizeof(ThreadContext)*thread_count);
 121     s->thread_opaque= c;
 122
 123     for(i=0; i<thread_count; i++){
 124 //printf("init semaphors %d\n", i); fflush(stdout);
 125         c[i].avctx= s;
 126
 127         if (DosCreateEventSem(NULL,&c[i].work_sem,DC_SEM_SHARED,0))
 128             goto fail;
 129         if (DosCreateEventSem(NULL,&c[i].done_sem,DC_SEM_SHARED,0))
 130             goto fail;
 131
 132 //printf("create thread %d\n", i); fflush(stdout);
 133 //        c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid );
 134         c[i].thread = _beginthread(thread_func, NULL, 0x10000, &c[i]);
 135         if( c[i].thread <= 0 ) goto fail;
 136     }
 137 //printf("init done\n"); fflush(stdout);
 138
 139     s->execute= avcodec_thread_execute;
 140
 141     return 0;
 142 fail:
 143     avcodec_thread_free(s);
 144     return -1;
 145 }