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
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
###############################################################################
## ----------------------------------------------------------------------------
## 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 = '1.879';
use base 'MCE::Mutex';
use Scalar::Util qw(weaken);
use MCE::Util ();
my $tid = $INC{'threads.pm'} ? threads->tid() : 0;
sub CLONE {
$tid = threads->tid() if $INC{'threads.pm'};
}
sub DESTROY {
my ($pid, $obj) = ($tid ? $$ .'.'. $tid : $$, @_);
syswrite($obj->{_w_sock}, '0'), $obj->{$pid } = 0 if $obj->{$pid };
syswrite($obj->{_r_sock}, '0'), $obj->{$pid.'b'} = 0 if $obj->{$pid.'b'};
if ( $obj->{_init_pid} eq $pid ) {
($^O eq 'MSWin32' && $obj->{impl} eq 'Channel')
? MCE::Util::_destroy_pipes($obj, qw(_w_sock _r_sock))
: MCE::Util::_destroy_socks($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 $i ( 0 .. @mutex - 1 ) {
syswrite($mutex[$i]->{_w_sock}, '0'), $mutex[$i]->{$pid} = 0
if ( $mutex[$i]->{$pid} );
syswrite($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 ? $$ .'.'. $tid : $$;
($^O eq 'MSWin32')
? MCE::Util::_pipe_pair(\%obj, qw(_r_sock _w_sock))
: MCE::Util::_sock_pair(\%obj, qw(_r_sock _w_sock), undef, 1);
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);
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
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;
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 1.879
=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
|
