Technical Q&A QA1122

MPRemoteCall Contexts

Q: In "Multiprocessing.h" there are two constants for the context parameter of MPRemoteCall that aren't covered in the documentation. What do kMPInterruptRemoteContext and kMPAsyncInterruptRemoteContext do and when were they introduced?

A: kMPInterruptRemoteContext was introduced in Mac OS 9.1 and is documented in DTS Technote 2010 Mac OS 9.1.

kMPAsyncInterruptRemoteContext was introduced in Mac OS 9.2.1 and works much like kMPInterruptRemoteContext except that the MP task does not block waiting for the interrupt to execute. Thus the result from your MPRemoteProcedure is not returned as the result of MPRemoteCall. You might find this option useful for posting completion callbacks from an MP task.

Neither options are supported on Mac OS X.

[Feb 18 2002]