Commit | Line | Data |
4536f655 |
1 | package Stem::Event::Signal ; |
2 | |
3 | use Stem::Event::Queue ; |
4 | |
5 | use strict ; |
6 | use warnings ; |
7 | |
8 | use base 'Exporter' ; |
9 | our @EXPORT = qw( process_signal_queue ) ; |
10 | |
11 | # this generic signal event code needs the safe signals of perl 5.8+ |
12 | |
13 | use 5.008 ; |
14 | |
15 | my %signal2event ; |
16 | |
17 | my @signal_queue ; |
18 | my %cached_handlers ; |
19 | |
20 | # this sub will cache the handler closures so we can reuse them. |
21 | |
22 | sub _build { |
23 | |
24 | my( $self ) = @_ ; |
25 | |
26 | my $signal = $self->{'signal'} ; |
27 | |
28 | $self->{'method'} ||= "sig_\L${signal}_handler" ; |
29 | |
30 | # create the signal event handler and cache it. |
31 | # we cache them so we can reuse these closures and never leak |
32 | |
33 | $SIG{ $signal } = $cached_handlers{$signal} ||= |
34 | sub { |
35 | mark_not_empty() ; |
36 | #print "HIT $signal\n"; |
37 | push @signal_queue, $signal |
38 | } ; |
39 | |
40 | # track the event object for this signal |
41 | |
42 | $signal2event{$signal} = $self ; |
43 | |
44 | #print "$signal = $SIG{ $signal }\n" ; |
45 | return ; |
46 | } |
47 | |
48 | sub _cancel { |
49 | |
50 | my( $self ) = @_ ; |
51 | |
52 | $SIG{ $self->{'signal'} } = 'DEFAULT' ; |
53 | |
54 | return ; |
55 | } |
56 | |
57 | sub process_signal_queue { |
58 | |
59 | my $sig_count = @signal_queue ; |
60 | |
61 | #print "PROCESS SIGNAL Q $sig_count\n" ; |
62 | |
63 | # return if we have no pending signals |
64 | |
65 | return $sig_count unless $sig_count ; |
66 | |
67 | while( my $signal = shift @signal_queue ) { |
68 | |
69 | my $event = $signal2event{ $signal } ; |
70 | |
71 | next unless $event ; |
72 | next unless $event->{'active'} ; |
73 | |
74 | $event->trigger() ; |
75 | } |
76 | |
77 | return $sig_count ; |
78 | } |
79 | |
80 | 1 ; |