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5.11 acc_wait_async – Wait for completion of asynchronous operations.

Description
This function enqueues a wait operation on queue async for any and all asynchronous operations enqueued on queue arg.
C/C++:

Prototype: acc_wait_async(int arg, int async);

Fortran:

Interface: subroutine acc_wait_async(arg, async)
integer(acc_handle_kind) arg, async

Reference:
OpenACC specification v2.0, section 3.2.9.