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# ParallelTaskCompletion

Indicates to the system that the extension has completed an asynchronous request.

```
virtual void ParallelTaskCompletion(OSAction *action, SCSIUserParallelResponse response);
```

## Parameters

`action`

A pointer to the <doc://com.apple.documentation/documentation/DriverKit/OSAction> object of the asynchronous request that the system specifies in a [`UserProcessParallelTask`](/documentation/SCSIControllerDriverKit/IOUserSCSIParallelInterfaceController/UserProcessParallelTask).

`response`

The result of the asychronous request.

## Discussion

Your driver extension class invokes this method to complete an asynchronous request.

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