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QuestionDragDrop to a native window? Pin
TuringTest112-Jan-04 19:20
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AnswerRe: DragDrop to a native window? Pin
Heath Stewart13-Jan-04 5:07
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GeneralRe: DragDrop to a native window? Pin
TuringTest113-Jan-04 5:55
TuringTest113-Jan-04 5:55 
Generalasking for system tray application Pin
azusakt12-Jan-04 16:25
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GeneralRe: asking for system tray application Pin
Jeff Mackie12-Jan-04 17:16
sussJeff Mackie12-Jan-04 17:16 
GeneralRe: asking for system tray application Pin
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GeneralRe: asking for system tray application Pin
Heath Stewart13-Jan-04 4:53
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Questionreturning when inside a lock - is it safe? Pin
Brandon Haase12-Jan-04 15:29
Brandon Haase12-Jan-04 15:29 
I've run into a situation I haven't seen before, and was wondering if someone with a bit more threading experience would like to chime in.

The class IsoCurrencyInfo maintains a collection of IsoCurrencyInfo singletons. The instances of IsoCurrencyInfo class themselves are read-only once created, so by themselves are thread-safe. The trick is keeping the ArrayList container in line. I think I have it nailed, but in doing so I am executing a return statement while inside a lock().

The code works very well under heavy concurrent load Cool | :cool: , but I can't help wondering "Is this safe?" Is there a better way to structure this method to optimize the locking?

I have adapted the Singleton implementation pattern[^] from Microsoft Patterns & Practices[^].

public static IsoCurrencyInfo GetInstance(string isoCode) 
{
	IsoCurrencyInfo newICI = null;

	if(null == _iciRegistry)
		lock(syncRoot) 
			if(null == _iciRegistry)
			{
				_iciRegistry = new ArrayList();

				newICI = new IsoCurrencyInfo(isoCode);
				_iciRegistry.Add(newICI);
			}
	if(null == newICI) 
		lock(syncRoot) 
		{
			foreach(IsoCurrencyInfo existingICI in _iciRegistry)
				if(existingICI.AlphaCode == isoCode)
					return existingICI;

			newICI = new IsoCurrencyInfo(isoCode);
			_iciRegistry.Add(newICI);
		}
	return newICI;
}

Thanks!
B
AnswerRe: returning when inside a lock - is it safe? Pin
Heath Stewart13-Jan-04 4:46
protectorHeath Stewart13-Jan-04 4:46 
GeneralRe: returning when inside a lock - is it safe? Pin
Brandon Haase13-Jan-04 16:13
Brandon Haase13-Jan-04 16:13 
AnswerRe: returning when inside a lock - is it safe? Pin
scadaguy13-Jan-04 5:23
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GeneralRe: returning when inside a lock - is it safe? Pin
Brandon Haase13-Jan-04 16:28
Brandon Haase13-Jan-04 16:28 
Generalremoting access Pin
haih12-Jan-04 15:23
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GeneralRe: remoting access Pin
Heath Stewart13-Jan-04 4:31
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GeneralHelp with MonthCalendar class Pin
KingTermite12-Jan-04 15:18
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GeneralRe: Help with MonthCalendar class Pin
Heath Stewart13-Jan-04 3:41
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GeneralRe: Help with MonthCalendar class Pin
KingTermite13-Jan-04 4:27
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GeneralRe: Help with MonthCalendar class Pin
Heath Stewart13-Jan-04 4:37
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GeneralRe: Help with MonthCalendar class Pin
KingTermite13-Jan-04 5:43
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GeneralRe: Help with MonthCalendar class Pin
Heath Stewart13-Jan-04 5:50
protectorHeath Stewart13-Jan-04 5:50 
GeneralRe: Help with MonthCalendar class Pin
KingTermite13-Jan-04 6:02
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GeneralRe: Help with MonthCalendar class Pin
Heath Stewart13-Jan-04 6:47
protectorHeath Stewart13-Jan-04 6:47 
GeneralRe: Help with MonthCalendar class Pin
KingTermite15-Jan-04 14:49
KingTermite15-Jan-04 14:49 
GeneralRe: Help with MonthCalendar class Pin
Heath Stewart16-Jan-04 3:42
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GeneralFile Permissions Pin
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