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|
###############################################################################
## ----------------------------------------------------------------------------
## MCE::Mutex::Flock - Mutex locking via Fcntl.
##
###############################################################################
package MCE::Mutex::Flock;
use strict;
use warnings;
no warnings qw( threads recursion uninitialized once );
our $VERSION = '1.888';
use base 'MCE::Mutex';
use Fcntl ':flock';
use Scalar::Util 'looks_like_number';
use Time::HiRes 'alarm';
my $tid = $INC{'threads.pm'} ? threads->tid() : 0;
sub CLONE {
$tid = threads->tid() if $INC{'threads.pm'};
}
sub DESTROY {
my ($pid, $obj) = ($tid ? $$ .'.'. $tid : $$, @_);
$obj->unlock(), close(delete $obj->{_fh}) if $obj->{ $pid };
unlink $obj->{path} if ($obj->{_init} && $obj->{_init} eq $pid);
return;
}
sub _open {
my ($pid, $obj) = ($tid ? $$ .'.'. $tid : $$, @_);
return if exists $obj->{ $pid };
open $obj->{_fh}, '+>>:raw:stdio', $obj->{path}
or Carp::croak("Could not create temp file $obj->{path}: $!");
return;
}
###############################################################################
## ----------------------------------------------------------------------------
## Public methods.
##
###############################################################################
my ($id, $prog_name) = (0);
$prog_name = $0;
$prog_name =~ s{^.*[\\/]}{}g;
$prog_name = 'perl' if ($prog_name eq '-e' || $prog_name eq '-');
sub new {
my ($class, %obj) = (@_, impl => 'Flock');
if (! defined $obj{path}) {
my ($pid, $tmp_dir, $tmp_file) = ( abs($$) );
if ($ENV{TEMP} && -d $ENV{TEMP} && -w _) {
if ($^O =~ /mswin|mingw|msys|cygwin/i) {
$tmp_dir = $ENV{TEMP};
$tmp_dir .= ($^O eq 'MSWin32') ? "\\Perl-MCE" : "/Perl-MCE";
mkdir $tmp_dir unless (-d $tmp_dir);
}
else {
$tmp_dir = $ENV{TEMP};
}
}
elsif ($ENV{TMPDIR} && -d $ENV{TMPDIR} && -w _) {
$tmp_dir = $ENV{TMPDIR};
}
elsif (-d '/tmp' && -w _) {
$tmp_dir = '/tmp';
}
else {
Carp::croak("No writable dir found for a temp file");
}
$id++, $tmp_dir =~ s{[\\/]$}{};
# remove tainted'ness from $tmp_dir
if ($^O eq 'MSWin32') {
($tmp_file) = "$tmp_dir\\$prog_name.$pid.$tid.$id" =~ /(.*)/;
} else {
($tmp_file) = "$tmp_dir/$prog_name.$pid.$tid.$id" =~ /(.*)/;
}
$obj{_init} = $tid ? $$ .'.'. $tid : $$;
$obj{ path} = $tmp_file.'.lock';
# test open
open my $fh, '+>>:raw:stdio', $obj{path}
or Carp::croak("Could not create temp file $obj{path}: $!");
close $fh;
# set permission
chmod 0600, $obj{path};
}
else {
# test open
open my $fh, '+>>:raw:stdio', $obj{path}
or Carp::croak("Could not obtain flock on file $obj{path}: $!");
close $fh;
}
return bless(\%obj, $class);
}
sub lock {
my ($pid, $obj) = ($tid ? $$ .'.'. $tid : $$, shift);
$obj->_open() unless exists $obj->{ $pid };
CORE::flock ($obj->{_fh}, LOCK_EX), $obj->{ $pid } = 1
unless $obj->{ $pid };
return;
}
*lock_exclusive = \&lock;
sub lock_shared {
my ($pid, $obj) = ($tid ? $$ .'.'. $tid : $$, shift);
$obj->_open() unless exists $obj->{ $pid };
CORE::flock ($obj->{_fh}, LOCK_SH), $obj->{ $pid } = 1
unless $obj->{ $pid };
return;
}
sub unlock {
my ($pid, $obj) = ($tid ? $$ .'.'. $tid : $$, shift);
CORE::flock ($obj->{_fh}, LOCK_UN), $obj->{ $pid } = 0
if $obj->{ $pid };
return;
}
sub synchronize {
my ($pid, $obj, $code) = ($tid ? $$ .'.'. $tid : $$, shift, shift);
my (@ret);
return unless ref($code) eq 'CODE';
$obj->_open() unless exists $obj->{ $pid };
# lock, run, unlock - inlined for performance
CORE::flock ($obj->{_fh}, LOCK_EX), $obj->{ $pid } = 1
unless $obj->{ $pid };
(defined wantarray)
? @ret = wantarray ? $code->(@_) : scalar $code->(@_)
: $code->(@_);
CORE::flock ($obj->{_fh}, LOCK_UN), $obj->{ $pid } = 0;
return wantarray ? @ret : $ret[-1];
}
*enter = \&synchronize;
sub timedwait {
my ($obj, $timeout) = @_;
die 'MCE::Mutex::Flock::timedwait() unimplemented in this platform'
if ($^O eq 'MSWin32');
$timeout = 1 unless defined $timeout;
Carp::croak('MCE::Mutex: timedwait (timeout) is not valid')
if (!looks_like_number($timeout) || $timeout < 0);
$timeout = 0.0003 if $timeout < 0.0003;
local $@; local $SIG{ALRM} = sub { alarm 0; die "timed out\n" };
eval { alarm $timeout; $obj->lock_exclusive };
alarm 0;
( $@ && $@ eq "timed out\n" ) ? '' : 1;
}
1;
__END__
###############################################################################
## ----------------------------------------------------------------------------
## Module usage.
##
###############################################################################
=head1 NAME
MCE::Mutex::Flock - Mutex locking via Fcntl
=head1 VERSION
This document describes MCE::Mutex::Flock version 1.888
=head1 DESCRIPTION
A Fcntl implementation for C<MCE::Mutex>.
The API is described in L<MCE::Mutex>.
=over 3
=item new
=item lock
=item lock_exclusive
=item lock_shared
=item unlock
=item synchronize
=item enter
=item timedwait
=back
=head1 AUTHOR
Mario E. Roy, S<E<lt>marioeroy AT gmail DOT comE<gt>>
=cut
|
