gecko-dev/config/mozLock.pm

98 строки
2.3 KiB
Perl
Исходник Обычный вид История

#
2012-05-21 15:12:37 +04:00
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
package mozLock;
use strict;
use IO::File;
use Cwd;
BEGIN {
use Exporter ();
use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
$VERSION = 1.00;
@ISA = qw(Exporter);
@EXPORT = qw(&mozLock &mozUnlock);
%EXPORT_TAGS = ( );
@EXPORT_OK = qw();
}
my $lockcounter = 0;
my $locklimit = 100;
my $locksleep = 0.1;
my %lockhash;
# File::Spec->rel2abs appears to be broken in ActiveState Perl 5.22
# so roll our own
sub priv_abspath($) {
my ($file) = @_;
my ($dir, $out);
my (@inlist, @outlist);
# Force files to have unix paths.
$file =~ s/\\/\//g;
# Check if file is already absolute
if ($file =~ m/^\// || substr($file, 1, 1) eq ':') {
return $file;
}
$out = cwd . "/$file";
# Do what File::Spec->canonpath should do
@inlist = split(/\//, $out);
foreach $dir (@inlist) {
if ($dir eq '..') {
pop @outlist;
} else {
push @outlist, $dir;
}
}
$out = join '/',@outlist;
return $out;
}
sub mozLock($) {
my ($inlockfile) = @_;
my ($lockhandle, $lockfile);
$lockfile = priv_abspath($inlockfile);
#print "LOCK: $lockfile\n";
$lockcounter = 0;
$lockhandle = new IO::File || die "Could not create filehandle for $lockfile: $!\n";
while ($lockcounter < $locklimit) {
if (! -e $lockfile) {
open($lockhandle, ">$lockfile") || die "$lockfile: $!\n";
$lockhash{$lockfile} = $lockhandle;
last;
}
$lockcounter++;
select(undef,undef,undef, $locksleep);
}
if ($lockcounter >= $locklimit) {
undef $lockhandle;
die "$0: Could not get lockfile $lockfile.\nRemove $lockfile to clear up\n";
}
}
sub mozUnlock($) {
my ($inlockfile) = @_;
my ($lockhandle, $lockfile);
#$lockfile = File::Spec->rel2abs($inlockfile);
$lockfile = priv_abspath($inlockfile);
#print "UNLOCK: $lockfile\n";
$lockhandle = $lockhash{$lockfile};
if (defined($lockhandle)) {
close($lockhandle);
$lockhash{$lockfile} = undef;
unlink($lockfile);
} else {
print "WARNING: $0: lockhandle for $lockfile not defined. Lock may not be removed.\n";
}
}
END {};
1;