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Code Issues Releases Activity

Fix w32thread implementation to handle job count > thread_count.

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Originally committed as revision 20224 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-10-13 13:03:12 +00:00
parent 5bd1fc6fbd
commit 1e6ff470b5
1 changed files with 35 additions and 21 deletions
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56
libavcodec/w32thread.c
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@ -29,10 +29,13 @@ typedef struct ThreadContext{
AVCodecContext *avctx;
HANDLE thread;
HANDLE work_sem;
HANDLE job_sem;
HANDLE done_sem;
int (*func)(AVCodecContext *c, void *arg);
void *arg;
int ret;
int argsize;
int *jobnr;
int *ret;
}ThreadContext;
@ -40,13 +43,19 @@ static unsigned WINAPI attribute_align_arg thread_func(void *v){
ThreadContext *c= v;
for(;;){
int ret, jobnr;
//printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
WaitForSingleObject(c->work_sem, INFINITE);
WaitForSingleObject(c->job_sem, INFINITE);
jobnr = (*c->jobnr)++;
ReleaseSemaphore(c->job_sem, 1, 0);
//printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
if(c->func)
c->ret= c->func(c->avctx, c->arg);
ret= c->func(c->avctx, (uint8_t *)c->arg + jobnr*c->argsize);
else
return 0;
if (c->ret)
c->ret[jobnr] = ret;
//printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
ReleaseSemaphore(c->done_sem, 1, 0);
}
@ -65,12 +74,15 @@ void avcodec_thread_free(AVCodecContext *s){
for(i=0; i<s->thread_count; i++){
c[i].func= NULL;
ReleaseSemaphore(c[i].work_sem, 1, 0);
}
ReleaseSemaphore(c[0].work_sem, s->thread_count, 0);
for(i=0; i<s->thread_count; i++){
WaitForSingleObject(c[i].thread, INFINITE);
if(c[i].work_sem) CloseHandle(c[i].work_sem);
if(c[i].done_sem) CloseHandle(c[i].done_sem);
if(c[i].thread) CloseHandle(c[i].thread);
}
if(c[0].work_sem) CloseHandle(c[0].work_sem);
if(c[0].job_sem) CloseHandle(c[0].job_sem);
if(c[0].done_sem) CloseHandle(c[0].done_sem);
av_freep(&s->thread_opaque);
}
@ -78,25 +90,23 @@ void avcodec_thread_free(AVCodecContext *s){
int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
ThreadContext *c= s->thread_opaque;
int i;
int jobnr = 0;
assert(s == c->avctx);
assert(count <= s->thread_count);
/* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
for(i=0; i<count; i++){
c[i].arg= (char*)arg + i*size;
for(i=0; i<s->thread_count; i++){
c[i].arg= arg;
c[i].argsize= size;
c[i].func= func;
c[i].ret= 12345;
ReleaseSemaphore(c[i].work_sem, 1, 0);
c[i].ret= ret;
c[i].jobnr = &jobnr;
}
for(i=0; i<count; i++){
WaitForSingleObject(c[i].done_sem, INFINITE);
ReleaseSemaphore(c[0].work_sem, count, 0);
for(i=0; i<count; i++)
WaitForSingleObject(c[0].done_sem, INFINITE);
c[i].func= NULL;
if(ret) ret[i]= c[i].ret;
}
return 0;
}
@ -110,15 +120,19 @@ int avcodec_thread_init(AVCodecContext *s, int thread_count){
assert(!s->thread_opaque);
c= av_mallocz(sizeof(ThreadContext)*thread_count);
s->thread_opaque= c;
if(!(c[0].work_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL)))
goto fail;
if(!(c[0].job_sem = CreateSemaphore(NULL, 1, 1, NULL)))
goto fail;
if(!(c[0].done_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL)))
goto fail;
for(i=0; i<thread_count; i++){
//printf("init semaphors %d\n", i); fflush(stdout);
c[i].avctx= s;
if(!(c[i].work_sem = CreateSemaphore(NULL, 0, s->thread_count, NULL)))
goto fail;
if(!(c[i].done_sem = CreateSemaphore(NULL, 0, s->thread_count, NULL)))
goto fail;
c[i].work_sem = c[0].work_sem;
c[i].job_sem = c[0].job_sem;
c[i].done_sem = c[0].done_sem;
//printf("create thread %d\n", i); fflush(stdout);
c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid );