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5.6 acc_async_test – Test for completion of a specific asynchronous operation.

Description
This function tests for completion of the asynchrounous operation specified in arg. In C/C++, a non-zero value will be returned to indicate the specified asynchronous operation has completed. While Fortran will return a true. If the asynchrounous operation has not completed, C/C++ returns a zero and Fortran returns a false.
C/C++:

Prototype: int acc_async_test(int arg);

Fortran:

Interface: function acc_async_test(arg)
integer(kind=acc_handle_kind) arg
logical acc_async_test

Reference:
OpenACC specification v2.0, section 3.2.6.