[plt-scheme] Re: eq and hashing

From: Zbyszek Jurkiewicz (zbyszek at duch.mimuw.edu.pl)
Date: Mon Jun 2 13:50:25 EDT 2003

On Mon, 2 Jun 2003, Joe Marshall wrote:

>   For list-related administrative tasks:
>   http://list.cs.brown.edu/mailman/listinfo/plt-scheme
> ----- Original Message ----- 
> From: "Zbyszek Jurkiewicz" <zbyszek at duch.mimuw.edu.pl>
> > But...  we have laboratory in concurrent programming
> > on Linux.  Students learn to use IPC mechanisms like semaphores,
> > messages etc.  When a program crashes, all open files are closed.
> > But IPC mechanism should also be deleted and they are not.  They
> > stay in /tmp until their number reaches the limit.
> That's just an OS bug.

I am afraid not, OS does not know whether some program is still
using some gadget (in principle it possibly could) -- a "server"
has to destroy it and is not obvious who is the server.

Of course it has nothing to do with Scheme, I just wanted to show 
that such behavior is not necessarily "malicious" or stupid,
but could be.

Zbyszek Jurkiewicz

Posted on the users mailing list.