llvm-project/openmp/runtime/test/tasking/omp_task.c

// RUN: %libomp-compile-and-run
#include <stdio.h>
#include <math.h>
#include "omp_testsuite.h"
#include "omp_my_sleep.h"

int test_omp_task()
{
  int tids[NUM_TASKS];
  int i;

  #pragma omp parallel
  {
    #pragma omp single
    {
      for (i = 0; i < NUM_TASKS; i++) {
        /* First we have to store the value of the loop index in a new variable
         * which will be private for each task because otherwise it will be overwritten
         * if the execution of the task takes longer than the time which is needed to
         * enter the next step of the loop!
         */
        int myi;
        myi = i;
        #pragma omp task
        {
          my_sleep (SLEEPTIME);
          tids[myi] = omp_get_thread_num();
        } /* end of omp task */
      } /* end of for */
    } /* end of single */
  } /*end of parallel */

  /* Now we ckeck if more than one thread executed the tasks. */
  for (i = 1; i < NUM_TASKS; i++) {
    if (tids[0] != tids[i])
      return 1;
  }
  return 0;
} /* end of check_parallel_for_private */

int main()
{
  int i;
  int num_failed=0;

  if (omp_get_max_threads() < 2)
    omp_set_num_threads(8);

  for(i = 0; i < REPETITIONS; i++) {
    if(!test_omp_task()) {
      num_failed++;
    }
  }
  return num_failed;
}