[boost] singleton, dlls, and shared memory

From: Jason Hise (chaos_at_[hidden])
Date: 2005-08-02 12:56:36

I was researching how to ensure that a singleton has only one instance 
within a loaded dll and came up with this: 
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/using_shared_memory_in_a_dynamic_link_library.asp

The page has a lot of information, and while most of it makes a decent 
amount of sense, a good deal of it is still unfamiliar territory for 
me.  So I have a few of questions.

A) Security Attributes.  How important are they?  Is it ok to just use 
null for this parameter, or should I be researching this structure and 
its effects in depth?

B) Size of shared memory.  It appears that the 'pseudo file' being used 
as shared memory is fixed in size and thus I have to guess how much I 
might need at compile time.  Is there a way to resize this file if need be?

C) Allocating and deallocating the memory.  Is there existing code out 
there that takes a buffer of memory like this and manages malloc/free 
like calls to it (possibly wrapping the functionality in a std 
allocator) or do I need to roll my own?

-Jason