Re: Having problems with simple threaded perl CGI in mod_perl 1.29 (Apache 1.3.33)

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Bill Hess wrote:
> I am trying to write a simple threaded perl CGI script to run under 
> Apache::Registry on mod_perl 1.29 and Apache 1.3.33.
> The perl scipt only creates 2 or 3 threads and perform a join() on each 
> one to wait for data each thread returns.  The script seems to work 
> fine, returning all the data I expect and all the HTML is generated 
> using CGI.pm, thus rendering a complete and accurate page in a web 
> browser.  On the server I get errors in my Apache error_log:
> 
> [Thu May  5 01:01:03 2005] null: semi-panic: attempt to dup freed string.
> [Thu May  5 01:01:03 2005] [error] Undefined subroutine &main:: called.\n
> [Thu May  5 01:01:03 2005] null: semi-panic: attempt to dup freed string.
> [Thu May  5 01:01:03 2005] [error] Undefined subroutine &main:: called.\n
> [Thu May  5 01:01:04 2005] [notice] child pid 13166 exit signal 
> Segmentation fault (11), possible coredump in /usr/local/dmx/www
> 
> Running on RH 9 Linux - Perl 5.8.6, Apache 1.3.33, and mod_perl 1.29 all 
> built by myself from source (not using RPM's)
> 
> Any Ideas?  Thanks...

Certainly, Bill.

The short answer: mod_perl1 can't be used with perl ithreads.

The longer answer: I'm now working on making mp2 thread safe, you can try 
this branch:
https://svn.apache.org/repos/asf/perl/modperl/branches/clone-skip-unstable/

If you are interested I can explain why this is happening, and how we are 
going to fix it.

In any case, at the moment perl threads suck and I won't suggest to use 
them in production in the general case. It may work for you in certain 
cases. Try using the threads emulation with Liz's forks.pm from CPAN.

        -- 
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