1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
| | # Copyright (C) 2018-2020 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# Base class for per-inbox locking
package PublicInbox::Lock;
use strict;
use warnings;
use Fcntl qw(:flock :DEFAULT);
use Carp qw(croak);
# we only acquire the flock if creating or reindexing;
# PublicInbox::Import already has the lock on its own.
sub lock_acquire {
my ($self) = @_;
croak 'already locked' if $self->{lockfh};
my $lock_path = $self->{lock_path} or return;
sysopen(my $lockfh, $lock_path, O_WRONLY|O_CREAT) or
die "failed to open lock $lock_path: $!\n";
flock($lockfh, LOCK_EX) or die "lock failed: $!\n";
$self->{lockfh} = $lockfh;
}
sub lock_release {
my ($self) = @_;
return unless $self->{lock_path};
my $lockfh = delete $self->{lockfh} or croak 'not locked';
flock($lockfh, LOCK_UN) or die "unlock failed: $!\n";
close $lockfh or die "close failed: $!\n";
}
1;
|