Re: The cost of pthread-mutexes or corresponding...

[Richard Levitte - VMS Whacker]

From: Sean Walton <[EMAIL PROTECTED]>

swalton> You could a centralized locking system instead of heap.
swalton> Imagine creating a custom mutex table that is fixed (or even
swalton> dynamic).  As each mutex is allocated and freed, it would
swalton> come from this space.  Since it is centralized, it does not
swalton> fragment the heap, and sections of it could be swapped out of
swalton> RAM without intervention from the library (please note that
swalton> this is demand paging -- something Win2K has only begun to
swalton> play with).  Of course this would mean writing a new set of
swalton> mutex functions...

That's a way too.  The way I was thinking of was to make the mutex a
part of each structure that is allocated, but still be outside the
structure itself.  I'd do a malloc(size_of_mutex() + sizeof(RSA)) and
return a pointer to the RSA part of that blob.  I haven't thought
through everything yet.

This method would be intricate, that's true (and I said it would be
:-)), but it doesn't carry more administrative hassle than the object
itself, and we would avoid that extra pointer, or a pointer that
points to a table of pointers...

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