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5.4 acc_set_device_num – Set device number to use.

Description
This function will indicate to the runtime which device number, specified by num, associated with the specifed device type devicetype.
C/C++:

Prototype: acc_set_device_num(int num, acc_device_t devicetype);

Fortran:

Interface: subroutine acc_set_device_num(devicenum, devicetype)
integer devicenum
integer(kind=acc_device_kind) devicetype

Reference:
OpenACC specification v2.0, section 3.2.4.