On 01/28/10 09:21, "Adam R Maxwell" <adam.maxw...@pnl.gov> wrote:
> I think the easiest (and best-performing) way to do this would be to use a
> per-thread instance of BDSKTypeManager. I implemented this in my code, but
> it's only minimally tested. The only slightly tricky part is observing
> notifications, but that's not too bad.
I forgot to mention that I profiled this and saw no performance difference
vs. using the main thread singleton in +initialize. Using pthread_once
isn't quite as elegant as dispatch_once, but it's still fast and allows lazy
initialization.
// do not access directly; only used because pthread_once doesn't pass a
context pointer
static BDSKTypeManager *_mainThreadSharedInstance = nil;
static void __BDSKTypeManagerMainThreadInit() { _mainThreadSharedInstance =
[BDSKTypeManager new]; }
+ (BDSKTypeManager *)sharedManager{
// singleton used on the main thread
if (pthread_main_np()) {
static pthread_once_t once = PTHREAD_ONCE_INIT;
(void) pthread_once(&once, __BDSKTypeManagerMainThreadInit);
return _mainThreadSharedInstance;
}
NSParameterAssert(pthread_main_np() == 0);
// other threads get a new instance, saved in the thread's dictionary
NSString *key = @"BDSKTypeManagerPerThreadKey";
BDSKTypeManager *manager = [[[NSThread currentThread] threadDictionary]
objectForKey:key];
if (nil == manager) {
manager = [self new];
[[[NSThread currentThread] threadDictionary] setObject:manager
forKey:key];
[manager release];
}
return manager;
}
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