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Editorial Team
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Asked: 2026-06-02T02:16:44+00:00

The concept of message is normally associated with asynchronous call. Is it the case

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The concept of message is normally associated with asynchronous call. Is it the case for Objective C ? ie when a caller sends a message to a callee to execute a method on it, does the caller continues immediately or is it blocked until the callee finishes executing the method requested ?

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  1. Editorial Team

    It is definitely blocked. Because the messages are actually translated in plain C.

    [myObj myMethod];

    becomes

    objc_msgSend(myObj, @selector(myMethod));

    at run time.

    However, some methods are implemented to be asynchronous. See -[NSTask launch], -[NSThread start], etc.

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