Subj : Re: share a exclusive resource between the threads inside the different processes
To   : comp.programming.threads
From : steve
Date : Wed Mar 23 2005 03:19 pm

In article <d1qsa5$5l1$1@netnews.hinet.net>,
Hank <hank777@ms3.pchome.com.tw> wrote:
>Hi,
>
>Is is possible to share a exclusive resource between the threads inside the
>different processes?
>For example: ( In linux platform with POSIX thread )
>have 3 processes and each contain 3 threads , in other words there are 9
>threads inside the different processes
>how these threads can access the resource synchronously?
>mutex? semaphore? locking file? or..........

What's the resource?

Different resources have different techniques available, and
in some cases, you don't need to worry about it at all.

Depending on which glibc+kernel version you have, it may be possible
to use mutexes with the pshared attribute set.  Or semaphores.  I
would tend to avoid file locks because of some ... unusual ...
design choices made in POSIX (threads in a single process need to
use something besides file locks for mutual exclusion).
-- 
Steve Watt KD6GGD  PP-ASEL-IA          ICBM: 121W 56' 57.8" / 37N 20' 14.9"
 Internet: steve @ Watt.COM                         Whois: SW32
   Free time?  There's no such thing.  It just comes in varying prices...

.