Re: Threaded data freaking out
Re: Threaded data freaking out
- Subject: Re: Threaded data freaking out
- From: spike <email@hidden>
- Date: Sat, 8 Mar 2003 04:44:30 -0500
I've been reading up on NSLock (and the related classes) and I don't
quite understand it, I did some quick stuff to test it out, but the
error still occured.
I added a property (variable?) to my class called NSLock *lock; and in
my +init class method, I lock = [[NSLock alloc] init]; and called
[lock lock] and [lock unlock] sandwiched around my modifying code and
reading code, but that didn't fix it. I don't think I was doing it
right.
in the debugger, when I got that exception, sometimes row was out of
bounds, but other times it was well within the bounds (row == 1, yet
[fileSizes count] and [fileNames count] both were 5000+.
after looking at my threads and the stackTrace and all that I noticed
that this error occurs when my [myTableView reloadData] happens and I
store that value into the BOOL.
could someone give me a quick rundown on how locking works/ how to
implement it? I read the explanation on apple's site and the thing on
cocoadevcentral's site, but I really don't understand it.
...spike
On Friday, March 7, 2003, at 07:36 pm, Cameron Hayne wrote:
Spike wrote:
I've got an app that uses NSTableView and it's threaded. I get
*** -[NSCFArray objectAtIndex:]: index (1) beyond bounds (1)
I've been using the debugger and the only 2 arrays that I'm using I
got
the data for using po and they both have like 5000 items in them (like
they're supposed to).
The line of code that's wigging out is:
BOOL isMissing = [[fileSizes objectAtIndex: row] isKindOfClass:
[NSString class]];
Two comments:
1) You mention that your app is multi-threaded. So are you sure that
you are properly locking the data for access by the two threads?
2) The error message seems to say that the 'row' index is 1 and that
the array 'fileSizes' has only one element in it, hence the index is
out of bounds.
Cameron Hayne
email@hidden
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