| 1 |
root |
1.1 |
=head1 NAME |
| 2 |
|
|
|
| 3 |
|
|
Coro::Channel - message queues |
| 4 |
|
|
|
| 5 |
|
|
=head1 SYNOPSIS |
| 6 |
|
|
|
| 7 |
|
|
use Coro::Channel; |
| 8 |
|
|
|
| 9 |
|
|
$q1 = new Coro::Channel <maxsize>; |
| 10 |
|
|
|
| 11 |
|
|
$q1->put("xxx"); |
| 12 |
|
|
print $q1->get; |
| 13 |
|
|
|
| 14 |
|
|
die unless $q1->size; |
| 15 |
|
|
|
| 16 |
|
|
=head1 DESCRIPTION |
| 17 |
|
|
|
| 18 |
|
|
=over 4 |
| 19 |
|
|
|
| 20 |
|
|
=cut |
| 21 |
|
|
|
| 22 |
|
|
package Coro::Channel; |
| 23 |
|
|
|
| 24 |
|
|
use Coro::Process (); |
| 25 |
|
|
|
| 26 |
|
|
$VERSION = 0.01; |
| 27 |
|
|
|
| 28 |
|
|
=item $q = new Coro:Channel $maxsize |
| 29 |
|
|
|
| 30 |
|
|
Create a new channel with the given maximum size (unlimited if C<maxsize> |
| 31 |
|
|
is omitted). Stating a size of zero gives you a traditional channel, i.e. |
| 32 |
|
|
a queue that can store only a single element. |
| 33 |
|
|
|
| 34 |
|
|
=cut |
| 35 |
|
|
|
| 36 |
|
|
sub new { |
| 37 |
|
|
# [\@contents, $queue, $maxsize]; |
| 38 |
|
|
bless [[], [], $_[1]], $_[0]; |
| 39 |
|
|
} |
| 40 |
|
|
|
| 41 |
|
|
=item $q->put($scalar) |
| 42 |
|
|
|
| 43 |
|
|
Put the given scalar into the queue. |
| 44 |
|
|
|
| 45 |
|
|
=cut |
| 46 |
|
|
|
| 47 |
|
|
sub put { |
| 48 |
|
|
push @{$_[0][0]}, $_[1]; |
| 49 |
|
|
(pop @{$_[0][1]})->ready if @{$_[0][1]}; |
| 50 |
|
|
&Coro::Process::yield if defined $_[0][2] && @{$_[0][0]} > $_[0][2]; |
| 51 |
|
|
} |
| 52 |
|
|
|
| 53 |
|
|
=item $q->get |
| 54 |
|
|
|
| 55 |
|
|
Return the next element from the queue, waiting if necessary. |
| 56 |
|
|
|
| 57 |
|
|
=cut |
| 58 |
|
|
|
| 59 |
|
|
sub get { |
| 60 |
|
|
while (!@{$_[0][0]}) { |
| 61 |
|
|
push @{$_[0][1]}, $Coro::current; |
| 62 |
|
|
&Coro::Process::schedule; |
| 63 |
|
|
} |
| 64 |
|
|
shift @{$_[0][0]}; |
| 65 |
|
|
} |
| 66 |
|
|
|
| 67 |
|
|
=item $q->size |
| 68 |
|
|
|
| 69 |
|
|
Return the number of elements waiting to be consumed. Please note that: |
| 70 |
|
|
|
| 71 |
|
|
if ($q->size) { |
| 72 |
|
|
my $data = $q->get; |
| 73 |
|
|
} |
| 74 |
|
|
|
| 75 |
|
|
is NOT a race condition but works fine. |
| 76 |
|
|
|
| 77 |
|
|
=cut |
| 78 |
|
|
|
| 79 |
|
|
sub size { |
| 80 |
|
|
scalar @{$_[0][0]}; |
| 81 |
|
|
} |
| 82 |
|
|
|
| 83 |
|
|
1; |
| 84 |
|
|
|
| 85 |
|
|
=back |
| 86 |
|
|
|
| 87 |
|
|
=head1 AUTHOR |
| 88 |
|
|
|
| 89 |
|
|
Marc Lehmann <pcg@goof.com> |
| 90 |
|
|
http://www.goof.com/pcg/marc/ |
| 91 |
|
|
|
| 92 |
|
|
=cut |
| 93 |
|
|
|
