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 { |
907cbc6d |
35 | Stem::Event::Queue::queue_has_event() ; |
4536f655 |
36 | push @signal_queue, $signal |
37 | } ; |
38 | |
39 | # track the event object for this signal |
40 | |
41 | $signal2event{$signal} = $self ; |
42 | |
43 | #print "$signal = $SIG{ $signal }\n" ; |
4932dd97 |
44 | |
45 | # make sure the event queue is set up so we can handle signals in the |
46 | # event loop |
47 | |
48 | Stem::Event::Queue::_init_event_queue() ; |
49 | |
4536f655 |
50 | return ; |
51 | } |
52 | |
53 | sub _cancel { |
54 | |
55 | my( $self ) = @_ ; |
56 | |
57 | $SIG{ $self->{'signal'} } = 'DEFAULT' ; |
58 | |
59 | return ; |
60 | } |
61 | |
62 | sub process_signal_queue { |
63 | |
64 | my $sig_count = @signal_queue ; |
65 | |
66 | #print "PROCESS SIGNAL Q $sig_count\n" ; |
67 | |
68 | # return if we have no pending signals |
69 | |
70 | return $sig_count unless $sig_count ; |
71 | |
72 | while( my $signal = shift @signal_queue ) { |
73 | |
74 | my $event = $signal2event{ $signal } ; |
75 | |
76 | next unless $event ; |
77 | next unless $event->{'active'} ; |
78 | |
79 | $event->trigger() ; |
80 | } |
81 | |
82 | return $sig_count ; |
83 | } |
84 | |
85 | 1 ; |