A.14 Mediante la directiva alineado sin una lista

El ejemplo siguiente (para sección 2.6.5 en la página 20) distingue los objetos compartidos afectados por una directiva de flush sin lista de los objetos compartidos que no se ven afectados:

Ejemplo

Código

// omp_flush_without_list.c
#include <omp.h>

int x, *p = &x;

void f1(int *q)
{
    *q = 1;
    #pragma omp flush
    // x, p, and *q are flushed
    //   because they are shared and accessible
    // q is not flushed because it is not shared.
}

void f2(int *q)
{
    #pragma omp barrier
    *q = 2;

    #pragma omp barrier
    // a barrier implies a flush
    // x, p, and *q are flushed
    //   because they are shared and accessible
    // q is not flushed because it is not shared.
}

int g(int n)
{
    int i = 1, j, sum = 0;
    *p = 1;

    #pragma omp parallel reduction(+: sum) num_threads(10)
    {
        f1(&j);
        // i, n and sum were not flushed
        //   because they were not accessible in f1
        // j was flushed because it was accessible
        sum += j;
        f2(&j);
        // i, n, and sum were not flushed
        //   because they were not accessible in f2
        // j was flushed because it was accessible
        sum += i + j + *p + n;
    }
    return sum;
}

int main()
{
}