source: CIVL/examples/omp/simple/raceCond2.c.s

/******************************************************************************
 * FILE: omp_bug2.c
 * DESCRIPTION:
 *   Another OpenMP program with a bug.
 * AUTHOR: Blaise Barney
 * LAST REVISED: 04/06/05
 ******************************************************************************/

// online source: https://computing.llnl.gov/tutorials/openMP/samples/C/omp_bug2.c

#include <omp.h>
#include <stdio.h>
#include <stdlib.h>

int main (int argc, char *argv[])
{
    int nthreads, i, tid;
    float total;
    
    /*** Spawn parallel region ***/
#pragma omp parallel
    {
        /* Obtain thread number */
        tid = omp_get_thread_num();
        /* Only master thread does this */
        if (tid == 0) {
            nthreads = omp_get_num_threads();
            printf("Number of threads = %d\n", nthreads);
        }
        printf("Thread %d is starting...\n",tid);
        
#pragma omp barrier
        
        /* do some work */
        total = 0.0;
#pragma omp for schedule(dynamic,10)
        for (i=0; i<1000000; i++)
            total = total + i*1.0;
        
        printf ("Thread %d is done! Total= %e\n",tid,total);
        
    } /*** End of parallel region ***/
}