Block until block is called

Subject: Block until block is called
From: Brian Norh <email@hidden>
Date: Sat, 27 Aug 2011 06:40:24 +0200
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Hi.

I'm working against an API which looks like this:

- (void)performOperationWithBlock:(void (^)(void))block

The call returns directly and the execution continues. At some point
the block is eventually called. How would I do to block execution
until the block have been called?

[obj performOperationWithBlock:^(void) {
    // Do something here
}];
// Block here until the block above have been called.

I have read the Blocks Programming Topics in the documentation but
have not found that they cover this scenario.

Brian
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