libgomp/testsuite/libgomp.c/reduction-1.c

   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 }