Re: NSOperation bug

[David Chisnall]

On 2 Mar 2011, at 08:21, Richard Frith-Macdonald wrote:

> It looks to me like I just never implemented support for 'concurrent' 
> operations in base (since operations actually run in parallel in separate 
> threads anyway, it probably seemed pointless) ... and probably this needs 
> significant rewriting.  I'll try to get round to that soon though.


Concurrent operations are used for things that handle their own concurrency - 
for example something that spawns an NSTask, or issues an XMLRPC message.  

I looked at the NSOperation code, and it did seem that code for supporting 
concurrent and non-concurrent operations was there (interleaved in a strange 
way, that made it hard to follow).  I also wasn't entirely convinced by the 
double condition variable.  This looked like it could cause deadlock, but I 
didn't have enough time to check exactly if / when it would.

David

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