What about removing replyQueue altogether, have the background operation add
it's result processing back into backgroundQueue and just wait on
backgroundQueue to finish?
-Stevo
On Oct 1, 2011, at 3:44 PM, Quincey Morris wrote:
> On Oct 1, 2011, at 15:06 , Kyle Sluder wrote:
>
>> NSOperationQueue backgroundQueue = /* some long-lived background queue */;
>> NSOperationQueue replyQueue = [NSOperationQueue new];
>> int totalResult = 0;
>>
>> [replyQueue setSuspended:YES];
>>
>> for (id foo in myFoos) {
>> [backgroundQueue addOperationWithBlock:^{
>> int result = DoSomething();
>> [replyQueue addOperationWithBlock:^{
>> totalResult += result;
>> }];
>> }];
>> }
>>
>> [replyQueue waitUntilAllOperationsAreFinished];
>>
>> /* all done! */
>
> Aren't you missing a [replyQueue setSuspended: NO] in there somewhere? And if
> you do that, aren't you then failing to wait for backgroundQueue to empty?
>
>> But this falls apart if -waitUntilAllOperationsAreFinished doesn't
>> look at -isSuspended, and it gets called before the first operation
>> gets enqueued on the replyQueue.
>
>
> I can't see anything that justifies an assumption that isSuspended has any
> effect on the wait. Occam's Razor says that the wait returns immediately if
> the queue is empty.
>
>> I can easily work around this by enqueuing a no-op operation on
>> replyQueue right after calling -setSuspended
>
> Why not use [backgroundQueue addOperations: … waitUntilFinished: YES], then
> [replyQueue waitUntilAllOperationsAreFinished], and forget about isSuspended?
>
>
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