GNU libgomp: acc_wait_all_async

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### 5.10 `acc_wait_all_async` – Wait for completion of all asynchronous operations.

Description

  This function enqueues a wait operation on the queue async for any and all asynchronous operations that have been previously enqueued on any queue.

C/C++:

  Prototype: | `acc_wait_all_async(int async);`

Fortran:

  Interface: | `subroutine acc_wait_all_async(async)`
  | `integer(acc_handle_kind) async`

Reference:

  OpenACC specification v2.0, section 3.2.11.