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###############################################################################
## ----------------------------------------------------------------------------
## MCE::Mutex::Channel2 - Provides two mutexes using a single channel.
##
###############################################################################
package MCE::Mutex::Channel2;
use strict;
use warnings;
no warnings qw( threads recursion uninitialized once );
our $VERSION = '1.887';
use if $^O eq 'MSWin32', 'threads';
use if $^O eq 'MSWin32', 'threads::shared';
use base 'MCE::Mutex::Channel';
use MCE::Util ();
use Scalar::Util 'looks_like_number';
use Time::HiRes 'alarm';
my $is_MSWin32 = ($^O eq 'MSWin32') ? 1 : 0;
my $tid = $INC{'threads.pm'} ? threads->tid() : 0;
sub CLONE {
$tid = threads->tid() if $INC{'threads.pm'};
}
###############################################################################
## ----------------------------------------------------------------------------
## Public methods.
##
###############################################################################
sub new {
my ($class, %obj) = (@_, impl => 'Channel2');
$obj{_init_pid} = $tid ? $$ .'.'. $tid : $$;
$obj{_t_lock} = threads::shared::share( my $t_lock ) if $is_MSWin32;
$obj{_t_lock2} = threads::shared::share( my $t_lock2 ) if $is_MSWin32;
MCE::Util::_sock_pair(\%obj, qw(_r_sock _w_sock), undef, 1);
CORE::syswrite($obj{_w_sock}, '0');
CORE::syswrite($obj{_r_sock}, '0');
bless \%obj, $class;
if ( caller !~ /^MCE:?/ || caller(1) !~ /^MCE:?/ ) {
MCE::Mutex::Channel::_save_for_global_cleanup(\%obj);
}
return \%obj;
}
sub lock2 {
my ($pid, $obj) = ($tid ? $$ .'.'. $tid : $$, shift);
CORE::lock($obj->{_t_lock2}), MCE::Util::_sock_ready($obj->{_w_sock})
if $is_MSWin32;
MCE::Util::_sysread($obj->{_w_sock}, my($b), 1), $obj->{ $pid.'b' } = 1
unless $obj->{ $pid.'b' };
return;
}
*lock_exclusive2 = \&lock2;
*lock_shared2 = \&lock2;
sub unlock2 {
my ($pid, $obj) = ($tid ? $$ .'.'. $tid : $$, shift);
CORE::syswrite($obj->{_r_sock}, '0'), $obj->{ $pid.'b' } = 0
if $obj->{ $pid.'b' };
return;
}
sub synchronize2 {
my ($pid, $obj, $code) = ($tid ? $$ .'.'. $tid : $$, shift, shift);
my (@ret, $b);
return unless ref($code) eq 'CODE';
# lock, run, unlock - inlined for performance
CORE::lock($obj->{_t_lock2}), MCE::Util::_sock_ready($obj->{_w_sock})
if $is_MSWin32;
MCE::Util::_sysread($obj->{_w_sock}, $b, 1), $obj->{ $pid.'b' } = 1
unless $obj->{ $pid.'b' };
(defined wantarray)
? @ret = wantarray ? $code->(@_) : scalar $code->(@_)
: $code->(@_);
CORE::syswrite($obj->{_r_sock}, '0'), $obj->{ $pid.'b' } = 0;
return wantarray ? @ret : $ret[-1];
}
*enter2 = \&synchronize2;
sub timedwait2 {
my ($obj, $timeout) = @_;
$timeout = 1 unless defined $timeout;
Carp::croak('MCE::Mutex::Channel2: timedwait2 (timeout) is not valid')
if (!looks_like_number($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->{_w_sock}, $timeout);
(!$is_MSWin32)
? ($obj->lock_exclusive2, $ret = 1, alarm(0))
: ($obj->lock_exclusive2, $ret = 1);
};
alarm 0 unless $is_MSWin32;
$ret;
}
1;
__END__
###############################################################################
## ----------------------------------------------------------------------------
## Module usage.
##
###############################################################################
=head1 NAME
MCE::Mutex::Channel2 - Provides two mutexes using a single channel
=head1 VERSION
This document describes MCE::Mutex::Channel2 version 1.887
=head1 DESCRIPTION
A socket implementation based on C<MCE::Mutex>. The secondary lock is accessed
by calling methods with the C<2> suffix.
The API is described in L<MCE::Mutex>.
=head2 construction
=over 3
=item new
my $mutex = MCE::Mutex->new( impl => 'Channel2' );
=back
=head2 primary lock
=over 3
=item lock
=item lock_exclusive
=item lock_shared
=item unlock
=item synchronize
=item enter
=item timedwait
=back
=head2 secondary lock
=over 3
=item lock2
=item lock_exclusive2
=item lock_shared2
=item unlock2
=item synchronize2
=item enter2
=item timedwait2
=back
=head1 AUTHOR
Mario E. Roy, S<E<lt>marioeroy AT gmail DOT comE<gt>>
=cut
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