On 20 Mar 2013, at 4:28, Roland King wrote:
All the code touching that variable is on the main thread. So it's
serialized by that.
Say you start block A (slow) and block B (fast).
Now block B calls main queue and we have ‘currentOperation ==
currentOperationAtQueueTime’ so we reset currentOperation to zero.
Then we fire block C and block A returns.
currentOperation is at 1 and currentOperationAtQueueTime for block A was
1, so we accept the result from A and reset currentOperation again.
Now block C finish, but its result is not accepted, since
currentOperation is 0 and block C wants 1.
So where we should have ignored block A and accepted B and then C, we
instead accept block B, A and ignore block C.
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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