task_reduction3.c

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// RUN: %libomp-compile-and-run
 
// XFAIL: icc
// UNSUPPORTED: clang-4, clang-5, clang-6, clang-7, clang-8, clang-9, clang-10
// UNSUPPORTED: gcc-4, gcc-5, gcc-6, gcc-7, gcc-8
 
#include <stdio.h>
#include <stdlib.h>
 
int a = 0, b = 1;
 
int main(int argc, char **argv) {
 
  #pragma omp parallel
  {
    #pragma omp sections reduction(task, +: a) reduction(task, *: b)
    {
      #pragma omp section
      {
        #pragma omp task in_reduction(+: a) in_reduction(*: b)
        {
          a += 1;
          b *= 1;
        }
      }
      #pragma omp section
      {
        #pragma omp task in_reduction(+: a) in_reduction(*: b)
        {
          a += 2;
          b *= 2;
        }
      }
      #pragma omp section
      {
        #pragma omp task in_reduction(+: a) in_reduction(*: b)
        {
          a += 3;
          b *= 3;
        }
      }
      #pragma omp section
      {
        #pragma omp task in_reduction(+: a) in_reduction(*: b)
        {
          a += 4;
          b *= 4;
        }
      }
      #pragma omp section
      {
        #pragma omp task in_reduction(+: a) in_reduction(*: b)
        {
          a += 5;
          b *= 5;
        }
      }
    }
  }
 
  if (a != 15) {
    fprintf(stderr, "error: a != 15. Instead a = %d\n", a);
    exit(EXIT_FAILURE);
  }
  if (b != 120) {
    fprintf(stderr, "error: b != 120. Instead b = %d\n", b);
    exit(EXIT_FAILURE);
  }
 
  return EXIT_SUCCESS;
}