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 St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21 //#define DEBUG
  22
  23 // Ported by Vlad Stelmahovsky
  24
  25 #include "avcodec.h"
  26
  27 #define INCL_DOS
  28 #define INCL_DOSERRORS
  29 #define INCL_DOSDEVIOCTL
  30 #include <os2.h>
  31
  32 typedef struct ThreadContext{
  33     AVCodecContext *avctx;
  34     int thread;
  35     HEV work_sem;
  36     HEV done_sem;
  37     int (*func)(AVCodecContext *c, void *arg);
  38     void *arg;
  39     int ret;
  40 }ThreadContext;
  41
  42
  43 void thread_func(void *v){
  44     ThreadContext *c= v;
  45
  46     for(;;){
  47         //printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
  48         DosWaitEventSem(c->work_sem, SEM_INDEFINITE_WAIT);
  49 //        WaitForSingleObject(c->work_sem, INFINITE);
  50 //printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
  51         if(c->func)
  52             c->ret= c->func(c->avctx, c->arg);
  53         else
  54             return;
  55         //printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
  56         DosPostEventSem(c->done_sem);
  57 //        ReleaseSemaphore(c->done_sem, 1, 0);
  58     }
  59
  60     return;
  61 }
  62
  63 /**
  64  * free what has been allocated by avcodec_thread_init().
  65  * must be called after decoding has finished, especially dont call while avcodec_thread_execute() is running
  66  */
  67 void avcodec_thread_free(AVCodecContext *s){
  68     ThreadContext *c= s->thread_opaque;
  69     int i;
  70
  71     for(i=0; i<s->thread_count; i++){
  72
  73         c[i].func= NULL;
  74         DosPostEventSem(c[i].work_sem);
  75         //        ReleaseSemaphore(c[i].work_sem, 1, 0);
  76         DosWaitThread((PTID)&c[i].thread,DCWW_WAIT);
  77 //        WaitForSingleObject(c[i].thread, INFINITE);
  78         if(c[i].work_sem) DosCloseEventSem(c[i].work_sem);//CloseHandle(c[i].work_sem);
  79         if(c[i].done_sem) DosCloseEventSem(c[i].done_sem);//CloseHandle(c[i].done_sem);
  80     }
  81
  82     av_freep(&s->thread_opaque);
  83 }
  84
  85 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
  86     ThreadContext *c= s->thread_opaque;
  87     int i;
  88
  89     assert(s == c->avctx);
  90     assert(count <= s->thread_count);
  91
  92     /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
  93
  94     for(i=0; i<count; i++){
  95
  96         c[i].arg= arg[i];
  97         c[i].func= func;
  98         c[i].ret= 12345;
  99
 100         DosPostEventSem(c[i].work_sem);
 101 //        ReleaseSemaphore(c[i].work_sem, 1, 0);
 102     }
 103     for(i=0; i<count; i++){
 104         DosWaitEventSem(c[i].done_sem,SEM_INDEFINITE_WAIT);
 105 //        WaitForSingleObject(c[i].done_sem, INFINITE);
 106
 107         c[i].func= NULL;
 108         if(ret) ret[i]= c[i].ret;
 109     }
 110     return 0;
 111 }
 112
 113 int avcodec_thread_init(AVCodecContext *s, int thread_count){
 114     int i;
 115     ThreadContext *c;
 116     uint32_t threadid;
 117
 118     s->thread_count= thread_count;
 119
 120     assert(!s->thread_opaque);
 121     c= av_mallocz(sizeof(ThreadContext)*thread_count);
 122     s->thread_opaque= c;
 123
 124     for(i=0; i<thread_count; i++){
 125 //printf("init semaphors %d\n", i); fflush(stdout);
 126         c[i].avctx= s;
 127
 128         if (DosCreateEventSem(NULL,&c[i].work_sem,DC_SEM_SHARED,0))
 129             goto fail;
 130         if (DosCreateEventSem(NULL,&c[i].done_sem,DC_SEM_SHARED,0))
 131             goto fail;
 132
 133 //printf("create thread %d\n", i); fflush(stdout);
 134 //        c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid );
 135         c[i].thread = _beginthread(thread_func, NULL, 0x10000, &c[i]);
 136         if( c[i].thread <= 0 ) goto fail;
 137     }
 138 //printf("init done\n"); fflush(stdout);
 139
 140     s->execute= avcodec_thread_execute;
 141
 142     return 0;
 143 fail:
 144     avcodec_thread_free(s);
 145     return -1;
 146 }