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3.6.9 omp_get_initial_device – Return device number of initial device ¶

Description:

This function returns a device number that represents the host device. Since OpenMP 5.1, this is equal to the value returned by the omp_get_num_devices function; since OpenMP 6.0 it may also return the value of omp_initial_device.

The effect of running this routine in a target region is unspecified.

Note that GCC inlines this function unless you compile with -fno-builtin-omp_get_initial_device. If GCC was not configured to support offloading, it expands to constant zero; in non-host code it expands to omp_initial_device; and otherwise it is replaced with a call to omp_get_num_devices.

C/C++

Prototype:

int omp_get_initial_device(void);

Fortran:

Interface:

integer function omp_get_initial_device()

See also:

omp_get_num_devices – Number of target devices

Reference:

OpenMP specification v4.5, Section 3.2.35.