/* Initialize the thread pool data structure */
xbt_parmap_t parmap = xbt_new0(s_xbt_parmap_t, 1);
+#ifdef HAVE_FUTEX_H
+ parmap->sync_event = xbt_new0(s_xbt_event_t, 1);
+#endif
parmap->num_workers = num_workers;
parmap->status = PARMAP_WORK;
-
- parmap->workers_ready = xbt_new0(s_xbt_barrier_t, 1);
- xbt_barrier_init(parmap->workers_ready, num_workers + 1);
- parmap->workers_done = xbt_new0(s_xbt_barrier_t, 1);
- xbt_barrier_init(parmap->workers_done, num_workers + 1);
-#ifndef HAVE_FUTEX_H
- parmap->workers_ready->mutex = xbt_os_mutex_init();
- parmap->workers_ready->cond = xbt_os_cond_init();
+#ifdef HAVE_FUTEX_H
+ parmap->sync_event->threads_to_wait = num_workers;
#endif
/* Create the pool of worker threads */
for(i=0; i < num_workers; i++){
worker = xbt_os_thread_create(NULL, _xbt_parmap_worker_main, parmap, NULL);
xbt_os_thread_detach(worker);
}
-
+#ifdef HAVE_FUTEX_H
+ xbt_event_init(parmap->sync_event);
+#endif
return parmap;
}
void xbt_parmap_destroy(xbt_parmap_t parmap)
{
XBT_DEBUG("Destroy parmap %p", parmap);
-
parmap->status = PARMAP_DESTROY;
-
- xbt_barrier_wait(parmap->workers_ready);
- XBT_DEBUG("Kill job sent");
- xbt_barrier_wait(parmap->workers_done);
-#ifndef HAVE_FUTEX_H
- xbt_os_mutex_destroy(parmap->workers_ready->mutex);
- xbt_os_cond_destroy(parmap->workers_ready->cond);
+#ifdef HAVE_FUTEX_H
+ xbt_event_signal(parmap->sync_event);
+ xbt_free(parmap->sync_event);
#endif
- xbt_free(parmap->workers_ready);
- xbt_free(parmap->workers_done);
xbt_free(parmap);
}
/* Assign resources to worker threads*/
parmap->fun = fun;
parmap->data = data;
-
- /* Notify workers that there is a job */
- xbt_barrier_wait(parmap->workers_ready);
- XBT_DEBUG("Job dispatched, lets wait...");
- xbt_barrier_wait(parmap->workers_done);
-
+#ifdef HAVE_FUTEX_H
+ xbt_event_signal(parmap->sync_event);
+#endif
XBT_DEBUG("Job done");
- parmap->fun = NULL;
- parmap->data = NULL;
}
static void *_xbt_parmap_worker_main(void *arg)
/* Worker's main loop */
while(1){
- xbt_barrier_wait(parmap->workers_ready);
-
+#ifdef HAVE_FUTEX_H
+ xbt_event_wait(parmap->sync_event);
+#endif
if(parmap->status == PARMAP_WORK){
XBT_DEBUG("Worker %u got a job", worker_id);
data_start++;
}
- xbt_barrier_wait(parmap->workers_done);
-
/* We are destroying the parmap */
}else{
- xbt_barrier_wait(parmap->workers_done);
+#ifdef HAVE_FUTEX_H
+ xbt_event_end(parmap->sync_event);
+#endif
XBT_DEBUG("Shutting down worker %u", worker_id);
return NULL;
}
}
#ifdef HAVE_FUTEX_H
- static void futex_wait(int *uaddr, int val)
- {
- XBT_DEBUG("Waiting on futex %d", *uaddr);
- syscall(SYS_futex, uaddr, FUTEX_WAIT_PRIVATE, val, NULL, NULL, 0);
- }
-
- static void futex_wake(int *uaddr, int val)
- {
- XBT_DEBUG("Waking futex %d", *uaddr);
- syscall(SYS_futex, uaddr, FUTEX_WAKE_PRIVATE, val, NULL, NULL, 0);
- }
-#endif
+static void futex_wait(int *uaddr, int val)
+{
+ XBT_VERB("Waiting on futex %p", uaddr);
+ syscall(SYS_futex, uaddr, FUTEX_WAIT_PRIVATE, val, NULL, NULL, 0);
+}
-/* Futex based implementation of the barrier */
-void xbt_barrier_init(xbt_barrier_t barrier, unsigned int threads_to_wait)
+static void futex_wake(int *uaddr, int val)
{
- barrier->threads_to_wait = threads_to_wait;
- barrier->thread_count = 0;
+ XBT_VERB("Waking futex %p", uaddr);
+ syscall(SYS_futex, uaddr, FUTEX_WAKE_PRIVATE, val, NULL, NULL, 0);
}
-#ifdef HAVE_FUTEX_H
- void xbt_barrier_wait(xbt_barrier_t barrier)
- {
- int myflag = 0;
- unsigned int mycount = 0;
-
- myflag = barrier->futex;
- mycount = __sync_add_and_fetch(&barrier->thread_count, 1);
- if(mycount < barrier->threads_to_wait){
- futex_wait(&barrier->futex, myflag);
- }else{
- barrier->futex = __sync_add_and_fetch(&barrier->futex, 1);
- barrier->thread_count = 0;
- futex_wake(&barrier->futex, barrier->threads_to_wait);
- }
- }
-#else
- void xbt_barrier_wait(xbt_barrier_t barrier)
- {
- xbt_os_mutex_acquire(barrier->mutex);
-
- barrier->thread_count++;
- if(barrier->thread_count < barrier->threads_to_wait){
- xbt_os_cond_wait(barrier->cond,barrier->mutex);
- }else{
- barrier->thread_count = 0;
- xbt_os_cond_broadcast(barrier->cond);
- }
- xbt_os_mutex_release(barrier->mutex);
- }
+void xbt_event_init(xbt_event_t event)
+{
+ int myflag = event->done;
+ if(event->thread_counter < event->threads_to_wait)
+ futex_wait(&event->done, myflag);
+}
+
+void xbt_event_signal(xbt_event_t event)
+{
+ int myflag = event->done;
+ event->thread_counter = 0;
+ event->work++;
+ futex_wake(&event->work, event->threads_to_wait);
+ futex_wait(&event->done, myflag);
+}
+
+void xbt_event_wait(xbt_event_t event)
+{
+ int myflag;
+ unsigned int mycount;
+
+ myflag = event->work;
+ mycount = __sync_add_and_fetch(&event->thread_counter, 1);
+ if(mycount == event->threads_to_wait){
+ event->done++;
+ futex_wake(&event->done, 1);
+ }
+
+ futex_wait(&event->work, myflag);
+}
+
+void xbt_event_end(xbt_event_t event)
+{
+ int myflag;
+ unsigned int mycount;
+
+ myflag = event->work;
+ mycount = __sync_add_and_fetch(&event->thread_counter, 1);
+ if(mycount == event->threads_to_wait){
+ event->done++;
+ futex_wake(&event->done, 1);
+ }
+}
#endif
#ifdef SIMGRID_TEST