1  #include <omp.h>
       2  #include <stdlib.h>
       3  
       4  int
       5  main (void)
       6  {
       7    int i = 0, j = 0, k = ~0;
       8    double d = 1.0;
       9  #pragma omp parallel num_threads(4) reduction(+:i) reduction(*:d) reduction(&:k)
      10    {
      11      if (i != 0 || d != 1.0 || k != ~0)
      12  #pragma omp atomic
      13        j |= 1;
      14    
      15      if (omp_get_num_threads () != 4)
      16  #pragma omp atomic
      17        j |= 2;
      18  
      19      i = omp_get_thread_num ();
      20      d = i + 1;
      21      k = ~(1 << (2 * i));
      22    }
      23  
      24    if (j & 1)
      25      abort ();
      26    if ((j & 2) == 0)
      27      {
      28        if (i != (0 + 1 + 2 + 3))
      29  	abort ();
      30        if (d != (1.0 * 2.0 * 3.0 * 4.0))
      31  	abort ();
      32        if (k != (~0 ^ 0x55))
      33  	abort ();
      34      }
      35    return 0;
      36  }