gcc/libgomp/testsuite/libgomp.c/depend-4.c

#include <stdlib.h>
#include <unistd.h>

int
main ()
{
  #pragma omp parallel
  #pragma omp single
  {
    int x = 1, y = 2, z = 3;
    #pragma omp taskgroup
    {
      #pragma omp task shared (x, y, z) depend(inout: x, y) \
		       depend (in: z) if (x > 10)
      {
	if (x != 1 || y != 2 || z != 3)
	  abort ();
	x = 4;
	y = 5;
      }
      /* The above task has depend clauses, but no dependencies
	 on earlier tasks, and is if (0), so must be scheduled
	 immediately.  */
      if (x != 4 || y != 5)
	abort ();
    }
    #pragma omp taskgroup
    {
      #pragma omp task shared (x, y) depend(in: x, y)
      {
	usleep (10000);
	if (x != 4 || y != 5 || z != 3)
	  abort ();
      }
      #pragma omp task shared (x, y) depend(in: x, y)
      {
	usleep (10000);
	if (x != 4 || y != 5 || z != 3)
	  abort ();
      }
      #pragma omp task shared (x, y, z) depend(inout: x, y) \
		       depend (in: z) if (x > 10)
      {
	if (x != 4 || y != 5 || z != 3)
	  abort ();
	x = 6;
	y = 7;
      }
      /* The above task has depend clauses, and may have dependencies
	 on earlier tasks, while it is if (0), it can be deferred.  */
    }
    if (x != 6 || y != 7)
      abort ();
  }
  return 0;
}