IOS function handler threadsafe

Question

The code below is called each time a scrollview scroll and if user scroll it multiple times, it crashed the code. How do i make sure only 1 code execute at a time or threadsafe?

 [self.cv addInfiniteScrollingWithActionHandler:^{
    [weakSelf loadNextPage];
}];

Please provide a stack trace and explain *why* it's crashing. If you don't know *why*, then you need to find out before looking for answers to unknown questions. — trojanfoe, Apr 24 '14 at 09:25

score 0 · Answer 1 · answered Apr 24 '14 at 09:21

Here is example

- (void)_startExperiment {  
      FooClass *foo = [[FooClass alloc] init];  
      dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);  

   for (int i = 0; i < 4; ++i) {  
     dispatch_async(queue, ^{  
       [foo doIt];  
     });  
   }  
   [foo release];  
 }

Detail is Here

score 0 · Answer 2 · edited May 23 '17 at 10:32

0

The common pattern is to use a mutex to protect a critical section of code where the structure is accessed and/or modified.

just go through this link-> Does @synchronized guarantees for thread safety or not?

edited May 23 '17 at 10:32

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answered Apr 24 '14 at 09:21

Vizllx

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IOS function handler threadsafe

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