[OT] Re: IPC::Shareable
Hi, The shared memory segment was already created by another user, and it was created without permissions for you to write to it. Try the ipcs command to view existing shared memory segments. Try the ipcrm command to remove an old one. Stephen At 03:02 PM 10/16/2001 -0700, Rasoul Hajikhani wrote: Pardon the off topic thread, I am trying to make IPC::Shareable work with my script, however I get this error: IPC::Shareable::SharedMem: shmget: Permission denied at /usr/local/lib/perl5/site_perl/5.005/IPC/Shareable.pm line 456 [Tue Oct 16 14:44:15 2001] [error] Could not create shared memory segment: Permission denied Does any one know what's up?
Re: IPC::Shareable
Make sure that you're not creating a too big shared memory segment and that you're (apache) running with an uid that is allowed to create shared memory segments. From the apache configuration file: # . On HPUX you may not be able to use shared memory as nobody, and the #suggested workaround is to create a user www and use that user. # NOTE that some kernels refuse to setgid(Group) or semctl(IPC_SET) # when the value of (unsigned)Group is above 6; hugs Luciano Rocha -- Luciano Rocha, [EMAIL PROTECTED] The trouble with computers is that they do what you tell them, not what you want. -- D. Cohen
Re: IPC::Shareable
I am trying to make IPC::Shareable work with my script, however I get this error: IPC::Shareable::SharedMem: shmget: Permission denied at /usr/local/lib/perl5/site_perl/5.005/IPC/Shareable.pm line 456 [Tue Oct 16 14:44:15 2001] [error] Could not create shared memory segment: Permission denied Does any one know what's up? In the time it takes you to debug it, you could switch your code to MLDBM::Sync and forget about all these annoying shared memory issues. It would probably be faster too. - Perrin
Re: IPC::Shareable
Perrin Harkins wrote: I am trying to make IPC::Shareable work with my script, however I get this error: IPC::Shareable::SharedMem: shmget: Permission denied at /usr/local/lib/perl5/site_perl/5.005/IPC/Shareable.pm line 456 [Tue Oct 16 14:44:15 2001] [error] Could not create shared memory segment: Permission denied Does any one know what's up? In the time it takes you to debug it, you could switch your code to MLDBM::Sync and forget about all these annoying shared memory issues. It would probably be faster too. - Perrin Cool, it is really fast... and very easy to implement... Curious though, is there a delete method/operation any where? Could not find anything in the perldoc docs indicating a method like that! Any ideas?? Thanks in advance. -r
Re: IPC::Shareable
is there a delete method/operation any where? Could not find anything in the perldoc docs indicating a method like that! It supports the same interface as normal hashes, so you can delete keys in the same way. You may also want to read the MLDBM documentation if you haven't already. - Perrin
Re: IPC::Shareable, or, it's supposed to SHARE it, not make more!
Rob Bloodgood [EMAIL PROTECTED] writes:
The code in expire_old_accounts is creating a new tied ARRAYREF instead of
replacing the value of the hash key on this line:
$ACCOUNTS{'QUEUE'} = [@accounts]; #also tried \@accounts;
This didn't happen w/ IPC::Shareable 0.52. But 0.6 is apparently very
different, and I can't make the code look like it wants, so the new
reference is a replacement, not an autovivication.
Sorry, but I think you're SOL with IPC::Shareable. Use something else
instead- I like BerkeleyDB for things like this, but you'll have to
serialize/stringify your hash values first.
--
Joe Schaefer
Re: IPC::Shareable, or, it's supposed to SHARE it, not make more!
One of the shiny golden nuggets I received from said slice was a shared memory cache. It was simple, it was elegant, it was perfect. It was also based on IPC::Shareable. GREAT idea. BAD juju. Just use Cache::Cache. It's faster and easier. - Perrin
Re: IPC::Shareable (was Re: Perl module - LWP)
On Sun, 22 Oct 2000, Steven Cotton wrote:
What version of Perl are you using? I had some problems with make test,
one of the tests doesn't return and I got a few munged shared memory
segment errors, I was attempting to install under Solaris 7 and Perl
5.6.0.
The messages about "munged shared memory" seem to be going if you change
my($tag, $ice) = unpack 'A14 A*' = $stuff;
in the file lib/IPC/Shareable.pm, sub _thaw to the:
my($tag, $ice) = unpack 'A13 A*' = $stuff;
(since the sub _freeze calls
my $stuff = 'IPC::Shareable' . $ice;
- i.e. 13 chars). But there are further problems ("make test" hangs)...
Re: IPC::Shareable (was Re: Perl module - LWP)
my $stuff = 'IPC::Shareable' . $ice; - i.e. 13 chars) Oops, sorry - I can't count on mondays!
Re: IPC::Shareable (was Re: Perl module - LWP)
On Sat, 21 Oct 2000, Alexander Farber (EED) wrote: Is anybody successfully using it under Solaris or OpenBSD? "make test" hangs for me on these platforms and the module author is unreachable :-( What version of Perl are you using? I had some problems with make test, one of the tests doesn't return and I got a few munged shared memory segment errors, I was attempting to install under Solaris 7 and Perl 5.6.0. If not IPC::Shareable, what module do you use for fast communication between Apache-children? I started with IPC::SharedCache since it did most of what I wanted, but took Sam Tregars advice and went with IPC::ShareLite (and serialised all data myself with Storables freeze thaw methods) and it works a dream. One thing I couldn't seem to do was delete() tied IPC::Shareable hash elements without getting the aforementioned "munged shared memory segment" errors, which I can do with IPC::ShareLite. -- steven
Re: IPC::Shareable (was Re: Perl module - LWP)
"Alexander Farber (EED)" wrote: "David M. Davisson" wrote: Yes, it works fine. No mods. From: "David Jourard" [EMAIL PROTECTED] Has anyone worked with the LWP module under mod_perl and have they found that it works with no modification. I would like to ask the same question about IPC::Shareable. Is anybody successfully using it under Solaris or OpenBSD? "make test" hangs for me on these platforms and the module author is unreachable :-( http://vorpal.mcs.drexel.edu/bsd-ports/helix/shared-memory.html doesn't seem to help on OpenBSD (increasing SHMMAXPGS up to 4096) If not IPC::Shareable, what module do you use for fast communication between Apache-children? IPC::ShareLite is writen in C (and hence faster (arguably)), but it does not serial data structures, so either Freeze / Thaw or DataDumper are you friends here. I've seen IPC::Sharable working ok on Solaris 2.6 but cannot offer any guideance as to why it may not work. Greg
Re: IPC::Shareable problems
Steven Cotton wrote: Hi, I've been having some problems delete()'ing elements from a tied IPC::Shareable hash. The example from the pod works fine (but that's not running under mod_perl) so I'm wondering if there are any lifetime/scope issues with using IPC::Shareable 0.51 under mod_perl 1.24. Has anyone had any "Munged shared memory segment (size exceeded?)" errors when trying to access (I'm using `exists()') a previously deleted hash element? I see no examples in the Eagle of deleting tied and shared hash elements (only under Apache::Registry), and Deja and various newsgroups and web searches haven't turned up anything. I'm running Apache 1.3.12 and Perl 5.6.0. Thanks, -- Steven Cotton [EMAIL PROTECTED] hi, you should try with IPC::ShareLite which provide the same things but seems better maintained...
