ovni/test/rt/openmp/barrier-explicit.c

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#include <stdio.h>
#include <math.h>
#include "compat.h"
#define N 100
static void
dummy_work(double *x, int i)
{
sleep_us(i);
x[i] += sqrt((double) i);
}
int main(void)
{
double x[N] = { 0 };
#pragma omp parallel
{
#pragma omp single
{
for (int i = 0; i < N; i++) {
#pragma omp task shared(x)
dummy_work(x, i);
}
}
sleep_us(200);
#pragma omp barrier
sleep_us(1000);
#pragma omp barrier
#pragma omp single
{
for (int i = 0; i < N; i++) {
#pragma omp task shared(x)
dummy_work(x, i);
}
}
}
double sum = 0.0;
for (int i = 0; i < N; i++)
sum += x[i];
printf("sum = %e\n", sum);
return 0;
}