Hello, i'm working with a kind-of-daemon for my mp2 modules. I will u se on Linux but i'm doing the "testing" on a windows machine, and i am having troubles with fork processes and signal caching: Procedure A is auto-forked and live in an infinite-loop. Procedure B is a function (called by pointing to an URL) to stop this infinite loop.
[...]
The problem is that sometimes the signal is received and the process finishes (but usually apache crashes), and sometimes (most of times) the signal is ignored. I've realized that without the "sleep" instruction in the while loop the signal is always catched and the process finishes always, but sometimes apache crashes equally.
Starting from 5.8.0 perl delays signal delivery, making signals safe. For more information please see:
http://search.cpan.org/dist/perl/pod/perl58delta.pod#Safe_Signals
http://search.cpan.org/dist/perl/pod/perlipc.pod#Deferred_Signals_(Safe_Signals)
If you want to disable that perl feature, you can either recompile perl (starting from 5.8.1):
http://search.cpan.org/dist/perl/pod/perl581delta.pod#Unsafe_signals_again_available
http://search.cpan.org/dist/perl/pod/perlrun.pod#PERL_SIGNALS
Or use POSIX signal handling which bypasses perl signal mechanism: http://search.cpan.org/dist/perl/ext/POSIX/POSIX.pod#POSIX::SigAction
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