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# -*- cperl -*-
## ====================================================================
##
## Copyright (c) 2006 Carnegie Mellon University. All rights
## reserved.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions
## are met:
##
## 1. Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimer.
##
## 2. Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in
## the documentation and/or other materials provided with the
## distribution.
##
## This work was supported in part by funding from the Defense Advanced
## Research Projects Agency and the National Science Foundation of the
## United States of America, and the CMU Sphinx Speech Consortium.
##
## THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
## ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
## THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
## PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
## NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##
## ====================================================================
##
## Author: David Huggins-Daines
##
use strict;
package Queue::POSIX;
use Queue::Job;
use POSIX qw(_exit setsid);
sub new {
my $this = shift;
my $class = ref $this || $this;
my $self = {};
bless $self, $class;
}
sub submit_job {
my $self = shift;
# Create a job object from arguments (not so elegant really)
my $job = Queue::Job->new(@_);
die "Failed to fork: $!" unless defined(my $pid = fork());
if ($pid) {
return $pid;
}
else {
if (defined($job->{outfile})) {
open STDOUT, ">$job->{outfile}" or die "Failed to open $job->{outfile}: $!";
}
if (defined($job->{errfile})) {
open STDERR, ">$job->{errfile}" or die "Failed to open $job->{errfile}: $!";
}
if (defined($job->{deps})) {
my $alive = @{$job->{deps}};
while ($alive > 0) {
$alive = kill(0, @{$job->{deps}});
sleep(1);
}
}
if (defined($job->{command})) {
exec @{$job->{command}} or die "Failed to exec: $!";
}
elsif (defined($job->{coderef})) {
my $rv = $job->{coderef}(@{$job->{codeargs}});
_exit($rv);
}
else {
warn "Invalid Queue::Job object!\n";
_exit(1);
}
}
}
sub query_job {
my ($self, $jobid) = @_;
kill 0 => $jobid;
}
sub waitfor_job {
my ($self, $jobid) = @_;
waitpid $jobid, 0;
}
sub cancel_job {
my ($self, $job) = @_;
kill TERM => $job;
}
1;
__END__
=head1 NAME
Queue::POSIX - Simulate a queue using processes on POSIX systems
=head1 SYNOPSIS
use Queue::POSIX;
my $q = Queue::POSIX->new();
my $id = $q->submit_job($cmd, @args);
waitfor_job($id);
cancel_job($id);
=head1 DESCRIPTION
=head1 AUTHOR
David Huggins-Daines <dhuggins@cs.cmu.edu>
=cut
|
