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Re: Synchronizing Thread Execution

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Re: Synchronizing Thread Execution

Subject: Re: Synchronizing Thread Execution
From: Alastair Houghton <email@hidden>
Date: Wed, 6 Dec 2006 18:10:51 +0000

On 6 Dec 2006, at 17:53, Scott Ribe wrote:

I'm not sure,
therefore,
what it is that you're disagreeing with.
- I misread the example and somehow saw @synchronized(_cmd) instead.
- But I have just verified on 10.4.8 that NSStringFromSelector (_cmd) returns a distinct NSString instance with each invocation. So unless @synchronized does some compiler voodoo with a hidden static variable to only evaluate it once, or uses something other than object identity in order to map locks, the example is wrong.

Agreed, the example looks broken to me too. I also checked NSStringFromSelector()'s behaviour (and disassembled it for good measure). About the only thing I can think is that CFString's implementation might once have unified the strings where now it doesn't.

I've filed a bug report: rdar://4867651

Kind regards,

Alastair.

--
http://alastairs-place.net


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