I have a method that's crashing with EXC_BAD_ACCESS. I'm running a fairly
lengthy, iterative process in a distpatch_async block and at the end of it
saving a file. Originally, I had included the file save in the block...
dispatch_async(queue,^{
[myObject doSomeHorrificCrunching];
[myObject saveDataToFile];
});
...and was getting a crash in certain situations -- it seemed to be related to
the size of the file (which also indicates the length/complexity of the
iterative process). So, I tried pulling the file save out of the block:
dispatch_async(queue,^{
[myObject doSomeHorrificCrunching];
});
[myObject saveDataToFile];
This also crashed (which is not surprising). So, just to check my theory that
perhaps the data was still being modified when the file save method was run, I
used dispatch_sync:
dispatch_sync(queue,^{
[myObject doSomeHorrificCrunching];
});
[myObject saveDataToFile];
This didn't crash, but of course I had to enjoy the glorious beach ball.
So, finally, I tried using a group (and going back to dispatch_async)...
dispatch_group_async(group, queue,^{
[myObject doSomeHorrificCrunching];
});
dispatch_group_notify(group, queue, ^{
[myObject saveDataToFile];
});
...but to my dismay, the crash came back.
I'm wondering: does this last step actually prove that my crash is _not_ being
caused by trying to save while the data is being modified?
Unfortunately, I haven't been able to get any info on the state of the object
when the crash happens. I have Zombies enabled, but I don't get any zombie
action in the console.
Confused...
J.
------------------------------------------------------
James B. Maxwell
Composer/Researcher/PhD Candidate
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