Parallel::Prefork::SpaUserrContributed Perl Parallel::Prefork::SpareWorkers(3)NAMEParallel::Prefork::SpareWorkers - A prefork server framework with
support for (min|max)spareservers
SYNOPSIS
use Parallel::Prefork::SpareWorkers qw(:status);
my $pm = Parallel::Prefork::SpareWorkers->new({
max_workers => 40,
min_spare_workers => 5,
max_spare_workers => 10,
trap_signals => {
TERM => 'TERM',
HUP => 'TERM',
USR1 => undef,
},
});
while ($pm->signal_recieived ne 'TERM') {
load_config();
$pm->start and next;
# do what ever you like, as follows
while (my $sock = $listener->accept()) {
$pm->set_status('A');
...
$sock->close();
$pm->set_status(STATUS_IDLE);
}
$pm->finish;
}
$pm->wait_all_children;
DESCRIPTION
"Parallel::Prefork::SpareWorkers" is a subclass of "Parallel::Prefork"
that supports setting minimum and maximum number of spare worker
processes, a feature commonly found in network servers. The module
adds to "Parallel::Prefork" several initialization parameters,
constants, and a method to set state of the worker processes.
METHODS
new
Instantiation. "Parallel::Prefork::ShpareWorkers" recognizes the
following parameters in addition to those defined by
"Parallel::Prefork". The parameters can be accessed using accessors
with same names as well.
min_spare_workers
minimum number of spare workers (mandatory)
max_spare_workers
maxmum number of spare workers (default: max_workers)
scoreboard_file
filename of scoreboard. If not set, "Parallel::Prefork::SpareWorkers"
will create a temporary file.
set_status
sets a single-byte character state of the worker process. Worker
processes should set any character of their choice using the function
(but not one of the reserved characters) to declare that it is running
some kind of task. Or the state should be set to "STATUS_IDLE" '_'
once the worker enters idle state. The other reserved character is
"STATUS_NEXIST" '.' which should never be set directly by applications.
CONSTANTS
STATUS_NEXIST
scoreboard status character '.', meaning no worker process is assigned
to the slot of the scoreboard. Applications should never set this
value directly.
STATUS_IDLE
scoreboard status character '_', meaning that a worker process is in
idle state
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
perl v5.14.22011-10-27Parallel::Prefork::SpareWorkers(3)
