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