A.3 Using Parallel Regions

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The parallel directive (Section 2.3 on page 8) can be used in coarse-grain parallel programs. In the following example, each thread in the parallel region decides what part of the global array x to work on, based on the thread number:

#pragma omp parallel shared(x, npoints) private(iam, np, ipoints)  
{  
    iam = omp_get_thread_num();  
    np =  omp_get_num_threads();  
    ipoints = npoints / np;  
    subdomain(x, iam, ipoints);  
}