iphone - Grand Central Dispatch function call -


good day,

i have function encapsulated in gcd block, calls function encapsulated in gcd block.

problem is, need caller gcd block stop running, until function [self callfunction] ends.

i write function doesnt have gcd encapsulation, prefer not to. there solution?

thanks

since block can call method , store result. grab main queue if need update ui or whatever need after completion. 

    dispatch_queue_t queue = dispatch_queue_create("read disc", null); dispatch_async(queue, ^{    result = [self readdisc];     dispatch_async(dispatch_get_main_queue(), ^{       //update ui or whatever need result of readdisc     }); }); dispatch_release(queue);

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