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Asked: 2026-06-08T01:17:30+00:00

Question for ObjectiveC gurus w/ some WinAPI background: Is there support for COM-like apartment

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Question for ObjectiveC gurus w/ some WinAPI background:

Is there support for COM-like apartment threading model in ObjectiveC?

  • Class A is single-threaded: all objects of class A are created in one specific thread, and all message handlers are invoked in that thread
  • Class B is multi-threaded: objects of class B can be created in any caller thread, and all message handlers are invoked only in original thread used to create the object
  • Class C is free-threaded: objects of class C can be created in any caller thread, message handlers can be invoked in any thread

My thoughts are: since ObjectiveC is about messages, COM+ like multi-threading can be easily achieved. Or not?

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1 Answer

  1. Editorial Team

    There is no built-in support for single-threaded or multi-threaded objects as defined by your question.

    In Mac OS X or iOS apps, you’d probably want to use GCD queues to enforce these policies yourself. I recommend the WWDC 2011 videos named “Blocks and Grand Central Dispatch in Practice” and “Mastering Grand Central Dispatch” for some great advice on applying GCD.

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