gcc/libgomp/testsuite/libgomp.c-c++-common/task-detach-10.c

/* { dg-do run } */

#include <omp.h>
#include <assert.h>

/* Test tasks with detach clause on an offload device.  Each device
   thread spawns off a chain of tasks in a taskgroup, that can then
   be executed by any available thread.  */

int main (void)
{
  int x = 0, y = 0, z = 0;
  int thread_count;
  omp_event_handle_t detach_event1, detach_event2;

  #pragma omp target map (tofrom: x, y, z) map (from: thread_count)
    #pragma omp parallel private (detach_event1, detach_event2)
      #pragma omp taskgroup
	{
	  #pragma omp single
	    thread_count = omp_get_num_threads ();

	  #pragma omp task detach (detach_event1) untied
	    #pragma omp atomic update
	      x++;

	  #pragma omp task detach (detach_event2) untied
	  {
	    #pragma omp atomic update
	      y++;
	    omp_fulfill_event (detach_event1);
	  }

	  #pragma omp task untied
	  {
	    #pragma omp atomic update
	      z++;
	    omp_fulfill_event (detach_event2);
	  }
	}

  assert (x == thread_count);
  assert (y == thread_count);
  assert (z == thread_count);
}