Visual Studio 2010
A.18 Nested for Directives
The following example of for directive nesting (Section 2.9 on page 33) is compliant because the inner and outer for directives bind to different parallel regions:
#pragma omp parallel default(shared)
{
#pragma omp for
for (i=0; i<n; i++)
{
#pragma omp parallel shared(i, n)
{
#pragma omp for
for (j=0; j<n; j++)
work(i, j);
}
}
}
A following variation of the preceding example is also compliant:
#pragma omp parallel default(shared)
{
#pragma omp for
for (i=0; i<n; i++)
work1(i, n);
}
void work1(int i, int n)
{
int j;
#pragma omp parallel default(shared)
{
#pragma omp for
for (j=0; j<n; j++)
work2(i, j);
}
return;
}