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Shared Object
OpenQNX Forum Index » General » QNX Newsgroups » qnx.bsp
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sh263
Post subject: Shared Object  PostPosted: May 24, 2006 - 11:19 AM
Active Member


Joined: Jan 12, 2005
Posts: 26
Location: Munich Germany
Hey,

is it possible to communicate between several processes with a shared object? I tryed this:

# Lib with the same data segment
[gid=0 uid=0 perms=777 data=uip code=uip type=file]
/usr/lib/libbib.so = Content/usr/lib/libbib.so

Tha data segment is shared. In the lib is a global Variable. I write a value with one process in the global Variable and read the global Variable with another process. The value is not the same. Can you tell me weather this is possible or not?

Regards, Stephan
 
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Thunderblade
Post subject: Re: Shared Object  PostPosted: May 24, 2006 - 02:10 PM
Senior Member


Joined: Apr 07, 2005
Posts: 259
I don't think you can do it this way. For libs, I believe threads use
something called 'thread local storage'.

It's much easier to use a shared memory object, from which both processes
can read.

Cheers,


Malte

"sh263" <stephan.huels@gmx-dot-de.no-spam.invalid> schrieb im Newsbeitrag
news:e51hpj$d06$1@inn.qnx.com...
Quote:
Hey,

is it possible to communicate between several processes with a shared
object? I tryed this:

# Lib with the same data segment
[gid=0 uid=0 perms=777 data=uip code=uip type=file]
/usr/lib/libbib.so = Content/usr/lib/libbib.so

Tha data segment is shared. In the lib is a global Variable. I write a
value with one process in the global Variable and read the global
Variable with another process. The value is not the same. Can you
tell me weather this is possible or not?

Regards, Stephan
 
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sh263
Post subject: RE: Re: Shared Object  PostPosted: May 29, 2006 - 06:33 AM
Active Member


Joined: Jan 12, 2005
Posts: 26
Location: Munich Germany
thanks for your answer. I will use a shared memory object.
 
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