1  /* { dg-do run } */
       2  
       3  #include <stdio.h>
       4  #include <omp.h>
       5  extern void abort (void);
       6  int
       7  main ()
       8  {
       9    int bad, x;
      10    x = 2;
      11    bad = 0;
      12  #pragma omp parallel num_threads(2) shared(x, bad)
      13    {
      14      if (omp_get_thread_num () == 0)
      15        {
      16  	volatile int i;
      17  	for (i = 0; i < 100000000; i++)
      18  	  x = 5;
      19        }
      20      else
      21        {
      22  	/* Print 1: the following read of x has a race */
      23  	if (x != 2 && x != 5)
      24  	  bad = 1;
      25        }
      26  #pragma omp barrier
      27      if (omp_get_thread_num () == 0)
      28        {
      29  	/* x must be 5 now.  */
      30  	if (x != 5)
      31  	  bad = 1;
      32        }
      33      else
      34        {
      35  	/* x must be 5 now.  */
      36  	if (x != 5)
      37  	  bad = 1;
      38        }
      39    }
      40  
      41    if (bad)
      42      abort ();
      43  
      44    return 0;
      45  }