How is your mainThreadParm declared? If it's a file global scope non-
pointer value, it could be getting optimized away.
Try declaring it static or volatile.
Also, if threads are changing mainThreadParm independently in non-
atomic ways, you will want to put locks around the critical sections.
Joe K.
On Nov 21, 2008, at 6:24, John Love <[EMAIL PROTECTED]> wrote:
From the main Thread, I call:
[NSThread detachNewThreadSelector:@selector(bgThread:) toTarget:self
withObject:nil];
- (void) bgThread:(NSConnection*)connection {
NSAutoreleasePool *pool;
pool = [[NSAutoreleasePool alloc] init];
[self doCalculation];
[self performSelectorOnMainThread:@selector(endBgCalculation:)
withObject:nil waitUntilDone:NO];
[pool release];
}
- (void) endBgCalculation:(id)obj {
// stuff
}
I believe this is fairly standard way to institute a background
thread …
The problem centers on letting the background Thread look at a parm
set in the main Thread and break out of the background Thread when
the background Thread sees a certain value.
Specifically, my –doCalculation is just one great time-consuming for
-loop that looks at mainThreadParm and breaks depending on the valu
e of mainThreadParm.
I change mainThreadParm in the main Thread and I expect the
background Thread to break when the background Thread sees a certain
value of mainThreadParm.
The background thread sees the initial value of mainThreadParm, but
does not break when the main Thread changes it.
This sounds so basic and fundamental that I really feel lacking on
this subject.
John Love
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