RE: [boost] Re: Thread lib (good reason for static)

From: Hurd, Matthew (hurdm_at_[hidden])
Date: 2004-06-08 18:01:46

> Behalf Of scott
> Assume use of a technique like the following (think this has been
> presented as "object shim"?);
> 
> T &
> anastasia()
> {
> 	static T *p = new T;
> 	return *p;
> }
> 
> as a means of dealing with global construction issue, i.e. instead
> of expressions like "anastasia.data_member" the usage is
> "anastasia().data_member". Also assume that some of these global
> objects (i.e. shims) deploy mutexes for MT reasons. What happens
> when there is more that one thread running around making calls
> to shims? Instantiation of the global itself becomes an MT issue.
 
That's what the double-checked locking pattern for singletons is for.

Regards,
 
Matt Hurd.
_______________

Matt Hurd
+61.2.8226.5029
hurdm_at_[hidden]
Susquehanna
_______________

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