1 |
=head1 NAME |
2 |
|
3 |
Coro::Timer - simple timer package, independent of used event loops |
4 |
|
5 |
=head1 SYNOPSIS |
6 |
|
7 |
use Coro::Timer qw(sleep timeout); |
8 |
# nothing exported by default |
9 |
|
10 |
sleep 10; |
11 |
|
12 |
=head1 DESCRIPTION |
13 |
|
14 |
This package implements a simple timer callback system which works |
15 |
independent of the event loop mechanism used. If no event mechanism is |
16 |
used, it is emulated. The C<Coro::Event> module overwrites functions with |
17 |
versions better suited. |
18 |
|
19 |
This module is not subclassable. |
20 |
|
21 |
=over 4 |
22 |
|
23 |
=cut |
24 |
|
25 |
package Coro::Timer; |
26 |
|
27 |
no warnings; |
28 |
|
29 |
use Carp (); |
30 |
use Exporter; |
31 |
|
32 |
use Coro (); |
33 |
use AnyEvent (); |
34 |
|
35 |
$VERSION = 4.6; |
36 |
@EXPORT_OK = qw(timeout sleep); |
37 |
|
38 |
=item $flag = timeout $seconds; |
39 |
|
40 |
This function will wake up the current coroutine after $seconds |
41 |
seconds and sets $flag to true (it is false initially). If $flag goes |
42 |
out of scope earlier nothing happens. This is used to implement the |
43 |
C<timed_down>, C<timed_wait> etc. primitives. It is used like this: |
44 |
|
45 |
sub timed_wait { |
46 |
my $timeout = Coro::Timer::timeout 60; |
47 |
|
48 |
while (condition false) { |
49 |
Coro::schedule; # wait until woken up or timeout |
50 |
return 0 if $timeout; # timed out |
51 |
} |
52 |
|
53 |
return 1; # condition satisfied |
54 |
} |
55 |
|
56 |
=cut |
57 |
|
58 |
# deep magic, expecially the double indirection :(:( |
59 |
sub timeout($) { |
60 |
my $current = $Coro::current; |
61 |
my $timeout; |
62 |
bless { |
63 |
timer => AnyEvent->timer (after => $_[0], cb => sub { |
64 |
$timeout = 1; |
65 |
$current->ready; |
66 |
}), |
67 |
timeout => \$timeout, |
68 |
}, "Coro::Timer::Timeout"; |
69 |
} |
70 |
|
71 |
package Coro::Timer::Timeout; |
72 |
|
73 |
sub bool { ${$_[0]{timeout}} } |
74 |
|
75 |
use overload 'bool' => \&bool, '0+' => \&bool; |
76 |
|
77 |
package Coro::Timer; |
78 |
|
79 |
=item sleep $seconds |
80 |
|
81 |
This function works like the built-in sleep, except maybe more precise |
82 |
and, most important, without blocking other coroutines. |
83 |
|
84 |
=cut |
85 |
|
86 |
sub sleep { |
87 |
my $current = $Coro::current; |
88 |
|
89 |
my $timer = AnyEvent->timer (after => $_[0], cb => sub { |
90 |
$current->ready; |
91 |
undef $current; |
92 |
}); |
93 |
|
94 |
do { &Coro::schedule } while $current; |
95 |
} |
96 |
|
97 |
$Coro::idle = sub { |
98 |
AnyEvent->one_event; |
99 |
}; |
100 |
|
101 |
1; |
102 |
|
103 |
=back |
104 |
|
105 |
=head1 AUTHOR |
106 |
|
107 |
Marc Lehmann <schmorp@schmorp.de> |
108 |
http://home.schmorp.de/ |
109 |
|
110 |
=cut |
111 |
|