All the code touching that variable is on the main thread. So it's serialized 
by that. 

On 16 Mar, 2013, at 23:13, Allan Odgaard <lists+cocoa-...@simplit.com> wrote:

> On 16 Mar 2013, at 14:14, Roland King wrote:
> 
>> […] you have a simple counter member variable, 'currentOperation'. It's set 
>> to 0 when you have no operation and you increment it each time you make a 
>> new one. The code looks like this (typed in mail) […]
>> 
>>        if( currentOperation == currentOperationAtQueueTime )
>>        {
>>            [ yourClass operationDidFinish ];
>>            currentOperation = 0;
>>        }
> 
> Correct me if I’m wrong, but you can only set ‘currentOperation’ to zero if 
> it’s a serial queue or you know it’s empty.
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