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aquarius/gist:1399872

Created November 28, 2011 10:16
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What is the best way to get notified when all callbacks have returned?
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gistfile1.m
for (myObject in objects) {
[myObject doWithCallback: ^(BOOL success){
//
}];
}
@anlumo
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anlumo commented Nov 28, 2011

Alternative (probably more efficient):

__block volatile int64_t counter = 0;
int64_t max = (int64_t)[objects count];

for (myObject in objects) {
    [myObject doWithCallback: ^(BOOL success){
        if(OSAtomicIncrement64Barrier(&counter) >= max) {
            // Done! Will only be executed once.
        }
    }];
}

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