Hi all,
Can't find an answer to this in the documentation. Does
-waitUntilAllOperationsAreFinished pay heed to the -isSuspended state
of the NSOperationQueue? I ask because I'm basically following this
pattern to collect responses from multiple concurrent background
operations in a thread-safe way.:
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! */
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 easily work around this by enqueuing a no-op operation on
replyQueue right after calling -setSuspended, but I'd like to know
whether there's a definitive answer to this question.
--Kyle Sluder
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