GNU libgomp: acc_wait_all

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### 5.9 `acc_wait_all` – Waits for completion of all asynchronous operations.

Description

  This function waits for the completion of all asynchronous operations.

C/C++:

  Prototype: | `acc_wait_all(void);`

Fortran:

  Interface: | `subroutine acc_wait_async()`

Reference:

  OpenACC specification v2.0, section 3.2.10.