NSOperation *operation = /*some operation*/;
[operationQueue addOperation:operation];
// …
// Some work
// …
return Value;
我愿从operation结束前获得
As far as I know, you can t.
You may wait for an operation to be done, but trying to preempt a threadpool task is somewhat pointless.
Even if you managed to pause/suspend the queue before you add your operation, you still have to resume it before you return, and you have no way to avoid a possible context switch at this point.
If the Value being returned is a shared var/global/field which might get modified by the operation, you may copy/clone its current value into a tempvar/local before the addOperation to return it later.
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