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2.21 omp_in_parallel – Whether a parallel region is active

Description:
This function returns true if currently running in parallel, false otherwise. Here, true and false represent their language-specific counterparts.
C/C++:

Prototype: int omp_in_parallel(void);

Fortran:

Interface: logical function omp_in_parallel()

Reference:
OpenMP specification v4.5, Section 3.2.6.