extern/ffmpeg/libavcodec/os2thread.c

   1 /*
   2  * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  *
  18  */
  19 //#define DEBUG
  20
  21 // Ported by Vlad Stelmahovsky
  22
  23 #include "avcodec.h"
  24 #include "common.h"
  25
  26 #ifdef HAVE_THREADS
  27
  28 #define INCL_DOS
  29 #define INCL_DOSERRORS
  30 #define INCL_DOSDEVIOCTL
  31 #include <os2.h>
  32
  33 typedef struct ThreadContext{
  34     AVCodecContext *avctx;
  35     int thread;
  36     HEV work_sem;
  37     HEV done_sem;
  38     int (*func)(AVCodecContext *c, void *arg);
  39     void *arg;
  40     int ret;
  41 }ThreadContext;
  42
  43
  44 void thread_func(void *v){
  45     ThreadContext *c= v;
  46
  47     for(;;){
  48         //printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
  49         DosWaitEventSem(c->work_sem, SEM_INDEFINITE_WAIT);
  50 //        WaitForSingleObject(c->work_sem, INFINITE);
  51 //printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
  52         if(c->func)
  53             c->ret= c->func(c->avctx, c->arg);
  54         else
  55             return;
  56         //printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
  57         DosPostEventSem(c->done_sem);
  58 //        ReleaseSemaphore(c->done_sem, 1, 0);
  59     }
  60
  61     return;
  62 }
  63
  64 /**
  65  * free what has been allocated by avcodec_thread_init().
  66  * must be called after decoding has finished, especially dont call while avcodec_thread_execute() is running
  67  */
  68 void avcodec_thread_free(AVCodecContext *s){
  69     ThreadContext *c= s->thread_opaque;
  70     int i;
  71
  72     for(i=0; i<s->thread_count; i++){
  73
  74         c[i].func= NULL;
  75         DosPostEventSem(c[i].work_sem);
  76         //        ReleaseSemaphore(c[i].work_sem, 1, 0);
  77         DosWaitThread((PTID)&c[i].thread,DCWW_WAIT);
  78 //        WaitForSingleObject(c[i].thread, INFINITE);
  79         if(c[i].work_sem) DosCloseEventSem(c[i].work_sem);//CloseHandle(c[i].work_sem);
  80         if(c[i].done_sem) DosCloseEventSem(c[i].done_sem);//CloseHandle(c[i].done_sem);
  81     }
  82
  83     av_freep(&s->thread_opaque);
  84 }
  85
  86 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
  87     ThreadContext *c= s->thread_opaque;
  88     int i;
  89
  90     assert(s == c->avctx);
  91     assert(count <= s->thread_count);
  92
  93     /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
  94
  95     for(i=0; i<count; i++){
  96
  97         c[i].arg= arg[i];
  98         c[i].func= func;
  99         c[i].ret= 12345;
 100
 101         DosPostEventSem(c[i].work_sem);
 102 //        ReleaseSemaphore(c[i].work_sem, 1, 0);
 103     }
 104     for(i=0; i<count; i++){
 105         DosWaitEventSem(c[i].done_sem,SEM_INDEFINITE_WAIT);
 106 //        WaitForSingleObject(c[i].done_sem, INFINITE);
 107
 108         c[i].func= NULL;
 109         if(ret) ret[i]= c[i].ret;
 110     }
 111     return 0;
 112 }
 113
 114 int avcodec_thread_init(AVCodecContext *s, int thread_count){
 115     int i;
 116     ThreadContext *c;
 117     uint32_t threadid;
 118
 119     s->thread_count= thread_count;
 120
 121     assert(!s->thread_opaque);
 122     c= av_mallocz(sizeof(ThreadContext)*thread_count);
 123     s->thread_opaque= c;
 124
 125     for(i=0; i<thread_count; i++){
 126 //printf("init semaphors %d\n", i); fflush(stdout);
 127         c[i].avctx= s;
 128
 129         if (DosCreateEventSem(NULL,&c[i].work_sem,DC_SEM_SHARED,0))
 130             goto fail;
 131         if (DosCreateEventSem(NULL,&c[i].done_sem,DC_SEM_SHARED,0))
 132             goto fail;
 133
 134 //printf("create thread %d\n", i); fflush(stdout);
 135 //        c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid );
 136         c[i].thread = _beginthread(thread_func, NULL, 0x10000, &c[i]);
 137         if( c[i].thread <= 0 ) goto fail;
 138     }
 139 //printf("init done\n"); fflush(stdout);
 140
 141     s->execute= avcodec_thread_execute;
 142
 143     return 0;
 144 fail:
 145     avcodec_thread_free(s);
 146     return -1;
 147 }
 148 #endif