Not at all , data handles are really pointers to in-ram objects , so
no 2 processes can have identical pointers in two seperate unix VMs.

I am sure there must be a better way , say a shared plain table with
numeric indices to refferences ...


On Mon, 2 Aug 2004, bruce wrote:

>  Date: Mon, 2 Aug 2004 07:55:40 -0700
>  From: bruce <bedouglas@[...].net>
>  To: '$Bill Luebkert' <dbecoll@[...].net>
>  Cc: perl-win32-users@[...].com
>  Subject: RE: pass by reference from parent to child
> 
>  never mind!!!
> 
>  a quick test of the perl IPC::Shareable function revealed that shared memory
>  within perl appears to support text only, but not 'data'...or at least not
>  DB connection handles...
> 
>  hmmmmm.. curiouser...
> 
>  thanks
> 
> 
>  -----Original Message-----
>  From: perl-win32-users-bounces@[...].com
>  [mailto:perl-win32-users-bounces@[...].com]On Behalf Of
>  bruce
>  Sent: Monday, August 02, 2004 6:54 AM
>  To: '$Bill Luebkert'
>  Cc: perl-win32-users@[...].com
>  Subject: RE: pass by reference from parent to child
> 
> 
>  bill...
> 
>  in your reply, you state that one can't use shared memory to 'share' db
>  handles!!!
> 
>  are you sure about this?
> 
>  -bruce
> 
> 
>  -----Original Message-----
>  From: perl-win32-users-bounces@[...].com
>  [mailto:perl-win32-users-bounces@[...].com]On Behalf Of
>  $Bill Luebkert
>  Sent: Sunday, August 01, 2004 10:52 PM
>  To: bedouglas@[...].net
>  Cc: perl-win32-users@[...].com
>  Subject: Re: pass by reference from parent to child
> 
> 
>  bruce wrote:
>  > hi...
>  >
>  > is it possible to pass an arg by ref from parent to child via exec/system
>  > shell and be able to retrieve the original value...
> 
>  I thought this was pretty much answered.  You cannot pass objects to
>  children/processes - what you can pass is basically ASCII strings.
> 
>  In UNIX, you could open a connection and fork a child and be able to
>  access the FDs the parent opened, but we're talking Win32 here and
>  you would have to go to threads and most Perl modules aren't thread
>  safe yet.
> 
>  You can pass data though files and shared memory etc, but not active
>  objects like open file or DB handles.
> 
>  > #use strict;
>  > use DBI;
>  > require ('mysql.inc');
>  >
>  >
>  > my $dbh = "";
>  >
>  > print "open db\n";
>  > $dbh = open_dbi();
>  >
>  > # at this point, dbh should be the connection id...
>  > print "dbh = ".$dbh."\n";
>  > my $db1;
>  > my $db2;
>  > $db1 = \$dbh;
>  > print "db1 = ".$db1."\n";
>  > system 'perl', 'aaa.pl', $db1;
>  >
>  > $db2 = $$db1;
>  > print "db2 = ".$db2."\n";
>  >
>  > this successfully gets 'db2' to have 'dbh', which is what one expects...
>  >
>  > and within the child app, it actually gets the correct REF... however, i'm
>  > not sure if it's possible to retrieve the actual val via this approach..
>  >
>  > using the $$arg doesn't get the correct val in the child app...
> 
>  Passing a handle to another process will do you no good - it isn't
>  usable by the other process.  The other process would have to open
>  it's own object to access the data source.
> 
>  --
>    ,-/-  __      _  _         $Bill Luebkert    Mailto:dbecoll@[...].net
>   (_/   /  )    // //       DBE Collectibles    Mailto:dbe@[...].com
>    / ) /--<  o // //      Castle of Medieval Myth & Magic
>  http://www.todbe.com/
>  -/-' /___/_<_</_</_    http://dbecoll.tripod.com/ (My Perl/Lakers stuff)
> 
>  _______________________________________________
>  Perl-Win32-Users mailing list
>  Perl-Win32-Users@[...].com
>  To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs
> 
>  _______________________________________________
>  Perl-Win32-Users mailing list
>  Perl-Win32-Users@[...].com
>  To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs
> 
>  _______________________________________________
>  Perl-Win32-Users mailing list
>  Perl-Win32-Users@[...].com
>  To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs
> 

-- 
Angelos Karageorgiou
Masters of Computer Science
City University of New York
http://www.unix.gr

_______________________________________________
Perl-Win32-Users mailing list
Perl-Win32-Users@[...].com
To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs