NAME

Parallel::Prefork - A simple prefork server framework

SYNOPSIS

  use Parallel::Prefork;
  
  my $pm = Parallel::Prefork->new({
    max_workers  => 10,
    trap_signals => {
      TERM => 'TERM',
      HUP  => 'TERM',
      USR1 => undef,
    }
  });
  
  while ($pm->signal_received ne 'TERM') {
    load_config();
    $pm->start and next;
    
    ... do some work within the child process ...
    
    $pm->finish;
  }
  
  $pm->wait_all_children();

DESCRIPTION

Parallel::Prefork is much like Parallel::ForkManager, but supports graceful shutdown and run-time reconfiguration.

METHODS

new

Instantiation. Takes a hashref as an argument. Recognized attributes are as follows.

max_workers

number of worker processes (default: 10)

err_respawn_interval

interval until next child process is spawned after a worker exits abnormally (default: 1)

trap_signals

hashref of signals to be trapped. Manager process will trap the signals listed in the keys of the hash, and send the signal specified in the associated value (if any) to all worker processes.

on_child_reap

Coderef that is called when a child is reaped. Receives the instance to the current Paralle::Prefork, the child's pid, and its exit status.

start

The main routine. Returns undef in child processes. Returns a true value within manager process upon receiving a signal specified in the trap_signals hashref.

finish

Child processes should call this function for termination. Takes exit code as an optional argument. Only usable from child processes.

signal_all_children

Sends signal to all worker processes. Only usable from manager process.

wait_all_children

Blocks until all worker processes exit. Only usable from manager process.

LICENSE

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

See http://www.perl.com/perl/misc/Artistic.html