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###############################################################################
## ----------------------------------------------------------------------------
## MCE::Mutex::Channel - Mutex locking via a pipe or socket.
##
###############################################################################
package MCE::Mutex::Channel;
use strict;
use warnings;
no warnings qw( threads recursion uninitialized once );
our $VERSION = '1.888';
use if $^O eq 'MSWin32', 'threads';
use if $^O eq 'MSWin32', 'threads::shared';
use base 'MCE::Mutex';
use MCE::Util ();
use Scalar::Util qw(looks_like_number weaken);
use Time::HiRes 'alarm';
my $is_MSWin32 = ($^O eq 'MSWin32') ? 1 : 0;
my $use_pipe = ($^O !~ /mswin|mingw|msys|cygwin/i && $] gt '5.010000');
my $tid = $INC{'threads.pm'} ? threads->tid : 0;
sub CLONE {
$tid = threads->tid if $INC{'threads.pm'};
}
sub DESTROY {
my ($pid, $obj) = ($tid ? $$ .'.'. $tid : $$, @_);
CORE::syswrite($obj->{_w_sock}, '0'), $obj->{$pid } = 0 if $obj->{$pid };
CORE::syswrite($obj->{_r_sock}, '0'), $obj->{$pid.'b'} = 0 if $obj->{$pid.'b'};
if ( $obj->{_init_pid} eq $pid ) {
(!$use_pipe || $obj->{impl} eq 'Channel2')
? MCE::Util::_destroy_socks($obj, qw(_w_sock _r_sock))
: MCE::Util::_destroy_pipes($obj, qw(_w_sock _r_sock));
}
return;
}
my @mutex;
sub _destroy {
my $pid = $tid ? $$ .'.'. $tid : $$;
# Called by { MCE, MCE::Child, and MCE::Hobo }::_exit
for my $i ( 0 .. @mutex - 1 ) {
CORE::syswrite($mutex[$i]->{_w_sock}, '0'), $mutex[$i]->{$pid} = 0
if ( $mutex[$i]->{$pid} );
CORE::syswrite($mutex[$i]->{_r_sock}, '0'), $mutex[$i]->{$pid.'b'} = 0
if ( $mutex[$i]->{$pid.'b'} );
}
}
sub _save_for_global_cleanup {
push(@mutex, $_[0]), weaken($mutex[-1]);
}
###############################################################################
## ----------------------------------------------------------------------------
## Public methods.
##
###############################################################################
sub new {
my ($class, %obj) = (@_, impl => 'Channel');
$obj{_init_pid} = $tid ? $$ .'.'. $tid : $$;
$obj{_t_lock} = threads::shared::share( my $t_lock ) if $is_MSWin32;
$use_pipe
? MCE::Util::_pipe_pair(\%obj, qw(_r_sock _w_sock))
: MCE::Util::_sock_pair(\%obj, qw(_r_sock _w_sock));
CORE::syswrite($obj{_w_sock}, '0');
bless \%obj, $class;
if ( caller !~ /^MCE:?/ || caller(1) !~ /^MCE:?/ ) {
MCE::Mutex::Channel::_save_for_global_cleanup(\%obj);
}
return \%obj;
}
sub lock {
my ($pid, $obj) = ($tid ? $$ .'.'. $tid : $$, shift);
CORE::lock($obj->{_t_lock}), MCE::Util::_sock_ready($obj->{_r_sock})
if $is_MSWin32;
MCE::Util::_sysread($obj->{_r_sock}, my($b), 1), $obj->{ $pid } = 1
unless $obj->{ $pid };
return;
}
*lock_exclusive = \&lock;
*lock_shared = \&lock;
sub unlock {
my ($pid, $obj) = ($tid ? $$ .'.'. $tid : $$, shift);
CORE::syswrite($obj->{_w_sock}, '0'), $obj->{ $pid } = 0
if $obj->{ $pid };
return;
}
sub synchronize {
my ($pid, $obj, $code) = ($tid ? $$ .'.'. $tid : $$, shift, shift);
my (@ret, $b);
return unless ref($code) eq 'CODE';
# lock, run, unlock - inlined for performance
CORE::lock($obj->{_t_lock}), MCE::Util::_sock_ready($obj->{_r_sock})
if $is_MSWin32;
MCE::Util::_sysread($obj->{_r_sock}, $b, 1), $obj->{ $pid } = 1
unless $obj->{ $pid };
(defined wantarray)
? @ret = wantarray ? $code->(@_) : scalar $code->(@_)
: $code->(@_);
CORE::syswrite($obj->{_w_sock}, '0'), $obj->{ $pid } = 0;
return wantarray ? @ret : $ret[-1];
}
*enter = \&synchronize;
sub timedwait {
my ($obj, $timeout) = @_;
$timeout = 1 unless defined $timeout;
Carp::croak('MCE::Mutex::Channel: timedwait (timeout) is not valid')
if (!looks_like_number($timeout) || $timeout < 0);
$timeout = 0.0003 if $timeout < 0.0003;
local $@; my $ret = '';
eval {
local $SIG{ALRM} = sub { alarm 0; die "alarm clock restart\n" };
alarm $timeout unless $is_MSWin32;
die "alarm clock restart\n"
if $is_MSWin32 && MCE::Util::_sock_ready($obj->{_r_sock}, $timeout);
(!$is_MSWin32)
? ($obj->lock_exclusive, $ret = 1, alarm(0))
: ($obj->lock_exclusive, $ret = 1);
};
alarm 0 unless $is_MSWin32;
$ret;
}
1;
__END__
###############################################################################
## ----------------------------------------------------------------------------
## Module usage.
##
###############################################################################
=head1 NAME
MCE::Mutex::Channel - Mutex locking via a pipe or socket
=head1 VERSION
This document describes MCE::Mutex::Channel version 1.888
=head1 DESCRIPTION
A pipe-socket 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
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