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2.23 omp_is_initial_device – Whether executing on the host device

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

Prototype: int omp_is_initial_device(void);

Fortran:

Interface: logical function omp_is_initial_device()

Reference:
OpenMP specification v4.5, Section 3.2.34.