#include <omp.h>
#include <stdio.h>
 
int b;
 
int main()
{
    int a = 1;
    int c = 3;
    b = 2;
 
    #pragma omp threadprivate(b)
 
    #pragma omp parallel firstprivate(c) num_threads(4)
    {
        int d = a + c;
 
        #pragma omp atomic
        c += 1;
 
        #pragma omp atomic
        a += 2;
 
        #pragma omp atomic
        d += 3;
 
        b = d;
 
        printf("a=%d b=%d c=%d d=%d\n", a, b, c, d);
    }
 
    printf("after: a=%d b=%d c=%d\n", a, b, c);
 
    return 0;
}
 

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