1  #include <omp.h>
       2  #include <stdlib.h>
       3  
       4  int
       5  main (void)
       6  {
       7    int i = 0, j = 0, k = 0, l = 0;
       8  #pragma omp parallel num_threads(4) reduction(-:i) reduction(|:k) \
       9  		     reduction(^:l)
      10    {
      11      if (i != 0 || k != 0 || l != 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      k = 1 << (2 * i);
      21      l = 0xea << (3 * 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 (k != 0x55)
      31  	abort ();
      32        if (l != 0x1e93a)
      33  	abort ();
      34      }
      35    return 0;
      36  }