Re: does method invocation involve a lock?

[Andreas Fink]

If I remember correctly, methods are not locked. They can run in parallel 
multiple times in multiple threads.
The exception are properties with the atomic attribute where the compiler 
synthesizes the getter/setter and thus makes sure that a getter and setter dont 
conflict with each other

        @property(atomic)

does this (which is default if I'm not mistaken). But that doesn't apply to 
methods.



> On 21 Sep 2018, at 16:49, Tom Sheffler <tom.sheffler@gmail.com> wrote:
> 
> This question is for my own research: I’m curious about whether invoking [obj 
> method] can block.  If obj is allocated, and method is simple, does method 
> invocation involve a lock.
> 
> I think the answer is YES.  But I looked at the source code for objc_msgSend 
> and didn’t see anything that looked like it acquired a lock.
> 
> Thanks for any insights.
> -Tom
> 
> 
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