NSDateFormatter crashes when used from different threads

Question

We keep getting a random, weird crash with NSDateFormatter. The relevant stack trace is:

Program received signal:  “EXC_BAD_ACCESS”.
#0  0x00000         


        

Answer 1

Another solution would be to serialize the execution of the code that uses NSDateFormatters, or any other non-thread-safe objects. Using Grand Central Dispatch you can push the code on the main_queue:

dispatch_async(dispatch_get_main_queue(), ^(void){
  [some_object some_message];
});

or use a private queue to achieve the same effect:

dispatch_queue_t dispatch_queue = dispatch_queue_create("com.MyApp.serializer",NULL);
dispatch_async(dispatch_queue, ^(void){
  [some_object some_message];
});