The code below works fine in debug builds, and a.f.a.i.k. up to now
used to work fine also in release builds, but now, in release builds,
it gets into an endless loop when trying to close the window while
conversion is ongoing. I don't know whence the sudden change in
behaviour, but I did find a work around: calling NSLog in the "while
(_isConverting)" loop causes the loop to correctly exit in release
builds too. Not just any call or assignment in the loop will result
in an exit. So far I've found only calling NSLog does.
Causes endless loop in release build if _isConverting is YES when the
while statement is reached.
- (BOOL)windowWillClose:(id)sender
{
#pragma unused (sender)
// Notify other threads that we will close
_isClosing = YES;
// Wait until the converting thread has terminated, if it exists
while (_isConverting) {
;
}
return YES;
}
With the following change the loop exists when supposed to:
while (_isConverting) {
NSLog(@"");
;
}
Could this be a compiler bug, or is this not a good way to handle
states across threads? (If I don't wait for _isConverting to become
NO in windowWillClose then the app may crash when closing a window,
hence the need for this loop.) Anybody an idea why this code above
works fine in debug build and loops endlessly in release build?
XCode 2.4
MacOS X 10.4.7
Thanks,
António
-----------------------------------------
Forgiveness is not an occasional act;
it is a permanent attitude.
--Martin Luther King, Jr
-----------------------------------------
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