Hi, On Wednesday 07 Apr 2010 14:59:08 Frenzel, Joerg (ext) wrote: > Hello, > > I need help by using threads in combination with external packages > (modules).
I would really recommend against using threads: * http://perldoc.perl.org/perlthrtut.html * http://www.perlmonks.org/index.pl?node_id=288022 They don't work as expected in Perl (though in C/C++, .NET and/or Java, they may be an option[Thr]), and cause too many problems. If you are keen on doing multi-tasking you should use either fork() and multi-processing or something like http://poe.perl.org/ , but often multi-tasking is the wrong solution for the problem. {{{ [Thr] - some people argue threads are always evil, and I can testify they are a large cause of software logistics headaches. I've written some programs of limited scope and ambitions using threads in C and they worked pretty well, but larger scope and more complex programs will be much harder to get right. }}} > > At main script threads were created and within these threads an > database-handler was defined. > > My Intention is to use this database-handler within a method of the > external module. > > The paramlist of my method contains a scalar variable $dhb > (database-handler) > > By using this variable with $dbh->Sql($statement); > $dbh has no Sql method (in case it's a DBI data base handle) and furthermore. > the perl compiler gives me the following error: "Thread error: Can't call > method "Sql" on an undefined value". > variables are not shared by default in perl's ithreads, as opposed to the intuitive way that people think about threads in C and other languages I've mentioned. Regards, Shlomi Fish -- ----------------------------------------------------------------- Shlomi Fish http://www.shlomifish.org/ Stop Using MSIE - http://www.shlomifish.org/no-ie/ Deletionists delete Wikipedia articles that they consider lame. Chuck Norris deletes deletionists whom he considers lame. Please reply to list if it's a mailing list post - http://shlom.in/reply . -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
