int _zbar_thread_start (zbar_thread_t *thr,
zbar_thread_proc_t *proc,
void *arg,
zbar_mutex_t *lock)
{
HANDLE hthr;
int rc;
if(thr->started || thr->running)
return(-1/*FIXME*/);
thr->started = 1;
_zbar_event_init(&thr->notify);
_zbar_event_init(&thr->activity);
hthr = CreateThread(NULL, 0, proc, arg, 0, NULL);
rc = (!hthr ||
_zbar_event_wait(&thr->activity, NULL, NULL) < 0 ||
!thr->running);
CloseHandle(hthr);
if(rc) {
thr->started = 0;
_zbar_event_destroy(&thr->notify);
_zbar_event_destroy(&thr->activity);
return(-1/*FIXME*/);
}
return(0);
}
int _zbar_processor_wait (zbar_processor_t *proc,
unsigned events,
zbar_timer_t *timeout)
{
_zbar_mutex_lock(&proc->mutex);
int save_level = proc->lock_level;
proc_waiter_t *waiter = proc_waiter_queue(proc);
waiter->events = events & EVENTS_PENDING;
_zbar_processor_unlock(proc, 1);
int rc;
if(proc->threaded)
rc = _zbar_event_wait(&waiter->notify, &proc->mutex, timeout);
else
rc = proc_wait_unthreaded(proc, waiter, timeout);
if(rc <= 0 || !proc->threaded) {
/* reacquire api lock */
waiter->events &= EVENT_CANCELED;
proc->wait_next = NULL;
if(!proc->lock_level) {
proc_waiter_t *w = proc_waiter_dequeue(proc);
assert(w == waiter);
}
else
_zbar_event_wait(&waiter->notify, &proc->mutex, NULL);
}
if(rc > 0 && (waiter->events & EVENT_CANCELED))
rc = -1;
assert(proc->lock_level == 1);
assert(_zbar_thread_is_self(proc->lock_owner));
proc->lock_level = save_level;
proc_waiter_release(proc, waiter);
_zbar_mutex_unlock(&proc->mutex);
return(rc);
}
int _zbar_thread_stop (zbar_thread_t *thr,
zbar_mutex_t *lock)
{
if(thr->started) {
thr->started = 0;
_zbar_event_trigger(&thr->notify);
while(thr->running)
/* FIXME time out and abandon? */
_zbar_event_wait(&thr->activity, lock, NULL);
_zbar_event_destroy(&thr->notify);
_zbar_event_destroy(&thr->activity);
}
return(0);
}
static ZTHREAD proc_video_thread (void *arg)
{
zbar_processor_t *proc = arg;
zbar_thread_t *thread = &proc->video_thread;
_zbar_mutex_lock(&proc->mutex);
_zbar_thread_init(thread);
zprintf(4, "spawned video thread\n");
while(thread->started) {
/* wait for video stream to be active */
while(thread->started && !proc->streaming)
_zbar_event_wait(&thread->notify, &proc->mutex, NULL);
if(!thread->started)
break;
/* blocking capture image from video */
_zbar_mutex_unlock(&proc->mutex);
zbar_image_t *img = zbar_video_next_image(proc->video);
_zbar_mutex_lock(&proc->mutex);
if(!img && !proc->streaming)
continue;
else if(!img)
/* FIXME could abort streaming and keep running? */
break;
/* acquire API lock */
_zbar_processor_lock(proc);
_zbar_mutex_unlock(&proc->mutex);
if(thread->started && proc->streaming)
_zbar_process_image(proc, img);
zbar_image_destroy(img);
_zbar_mutex_lock(&proc->mutex);
/* release API lock */
_zbar_processor_unlock(proc, 0);
}
thread->running = 0;
_zbar_event_trigger(&thread->activity);
_zbar_mutex_unlock(&proc->mutex);
return(0);
}
int _zbar_processor_lock (zbar_processor_t *proc)
{
if(!proc->lock_level) {
proc->lock_owner = _zbar_thread_self();
proc->lock_level = 1;
return(0);
}
if(_zbar_thread_is_self(proc->lock_owner)) {
proc->lock_level++;
return(0);
}
proc_waiter_t *waiter = proc_waiter_queue(proc);
_zbar_event_wait(&waiter->notify, &proc->mutex, NULL);
assert(proc->lock_level == 1);
assert(_zbar_thread_is_self(proc->lock_owner));
proc_waiter_release(proc, waiter);
return(0);
}
