[ale] Linuxthreads question

[Christopher Fowler]

On Tue, Jun 24, 2003 at 10:00:44AM -0400, John Mills wrote:
> 
> That was my first thought, roughly, and may still be a better approach. I
> was troubled by FUD as to whether I could have a large enough number of
> shared segments (8-10), then I found 'clone' and 'linuxthreads' which
> seemed to do what I wanted. I could use one BEEGGG segment, but I wanted 
> to allocate and attach each "writer"s buffer individually as a dedicated 
> resource. 

Think about it.  What is shared memory?  It is really just data that
is accessible via anyone with authority to read and/or write.  Here are 
possibilites of share memory.

1) Huge shared memory segments
2) File in /tmp/<filename>
3) Mount a tmpfs and use ram to store
   a temp file
4) Use a database and have an API that
   retrieves the data and converts to pointer

5) etc..

The posibilites are endless.  Shared memory was just an example.
You'll still need a locking system but you can store the 
data anywhere you like.  The benefit of using #1 is that the
pointer in your program is actually pointing to the data.
#2 and #3 will require mmap if you want a pointer to point to
that data.
#4 is a copy in and out system that can have discrepencies.

> 
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