On Mar 12, 2009, at 11:46 AM, McLaughlin, Michael P. wrote:
I have a "global" gFlags variable (unsigned long long) and several
objects
that need a pointer to it. I fill one such pointer, and reinit
gFlags, via
the following code:
if (flags == nil) {
flagPtr *flgH = &flags;
NSData *flgsDatum =
[[NSData alloc] initWithBytesNoCopy:flgH length:sizeof(flgH)
freeWhenDone:NO];
[[NSNotificationCenter defaultCenter]
postNotificationName:@"fetchFlags"
object:flgsDatum];
*flags = (WORKING | (*flags & LOGFILE));
}
This code appears to work successfully. My question is whether the
notification is responded to in a synchronous manner so that the
pointer is
guaranteed to be filled in by the time
*flags = (WORKING | (*flags & LOGFILE));
is executed.
NSNotificationCenter Class Reference sez:
"A notification center delivers notifications to observers
synchronously. In other words, thepostNotification: methods do not
return until all observers have received and processed the
notification. To send notifications asynchronously
useNSNotificationQueue. In a multithreaded application, notifications
are always delivered in the thread in which the notification was
posted, which may not be the same thread in which an observer
registered itself."
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