| 1 |
=head1 NAME |
| 2 |
|
| 3 |
Coro::Process - coroutine process abstraction |
| 4 |
|
| 5 |
=head1 SYNOPSIS |
| 6 |
|
| 7 |
use Coro::Process; |
| 8 |
|
| 9 |
async { |
| 10 |
# some asynchronous thread of execution |
| 11 |
}; |
| 12 |
|
| 13 |
# alternatively create an async process like this: |
| 14 |
|
| 15 |
sub some_func : Coro { |
| 16 |
# some more async code |
| 17 |
} |
| 18 |
|
| 19 |
yield; |
| 20 |
|
| 21 |
=head1 DESCRIPTION |
| 22 |
|
| 23 |
=cut |
| 24 |
|
| 25 |
package Coro::Process; |
| 26 |
|
| 27 |
use base Coro; |
| 28 |
use base Exporter; |
| 29 |
|
| 30 |
$VERSION = 0.01; |
| 31 |
|
| 32 |
@EXPORT = qw(async yield schedule); |
| 33 |
@EXPORT_OK = qw($current); |
| 34 |
|
| 35 |
{ |
| 36 |
use subs 'async'; |
| 37 |
|
| 38 |
my @async; |
| 39 |
|
| 40 |
sub import { |
| 41 |
Coro::Process->export_to_level(1, @_); |
| 42 |
my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE}; |
| 43 |
*{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"} = sub { |
| 44 |
my ($package, $ref) = (shift, shift); |
| 45 |
my @attrs; |
| 46 |
for (@_) { |
| 47 |
if ($_ eq "Coro") { |
| 48 |
push @async, $ref; |
| 49 |
} else { |
| 50 |
push @attrs, @_; |
| 51 |
} |
| 52 |
} |
| 53 |
return $old ? $old->($package, $name, @attrs) : @attrs; |
| 54 |
}; |
| 55 |
} |
| 56 |
|
| 57 |
sub INIT { |
| 58 |
async pop @async while @async; |
| 59 |
} |
| 60 |
} |
| 61 |
|
| 62 |
my $idle = new Coro::Process sub { |
| 63 |
&yield while 1; |
| 64 |
}; |
| 65 |
|
| 66 |
=item $main |
| 67 |
|
| 68 |
This coroutine represents the main program. |
| 69 |
|
| 70 |
=cut |
| 71 |
|
| 72 |
$main = new Coro::Process; |
| 73 |
|
| 74 |
=item $current |
| 75 |
|
| 76 |
The current coroutine (the last coroutine switched to). The initial value is C<$main> (of course). |
| 77 |
|
| 78 |
=cut |
| 79 |
|
| 80 |
$current = $main; |
| 81 |
|
| 82 |
# we really need priorities... |
| 83 |
my @ready = (); # the ready queue. hehe, rather broken ;) |
| 84 |
|
| 85 |
# static methods. not really. |
| 86 |
|
| 87 |
=head2 STATIC METHODS |
| 88 |
|
| 89 |
Static methods are actually functions that operate on the current process only. |
| 90 |
|
| 91 |
=over 4 |
| 92 |
|
| 93 |
=item async { ... }; |
| 94 |
|
| 95 |
Create a new asynchronous process and return it's process object |
| 96 |
(usually unused). When the sub returns the new process is automatically |
| 97 |
terminated. |
| 98 |
|
| 99 |
=cut |
| 100 |
|
| 101 |
sub async(&) { |
| 102 |
new Coro::Process $_[0]; |
| 103 |
} |
| 104 |
|
| 105 |
=item schedule |
| 106 |
|
| 107 |
Calls the scheduler. Please note that the current process will not be put |
| 108 |
into the ready queue, so calling this function usually means you will |
| 109 |
never be called again. |
| 110 |
|
| 111 |
=cut |
| 112 |
|
| 113 |
my $prev; |
| 114 |
|
| 115 |
sub schedule { |
| 116 |
($prev, $current) = ($current, shift @ready); |
| 117 |
Coro::transfer($prev, $current); |
| 118 |
} |
| 119 |
|
| 120 |
=item yield |
| 121 |
|
| 122 |
Yield to other processes. This function puts the current process into the |
| 123 |
ready queue and calls C<schedule>. |
| 124 |
|
| 125 |
=cut |
| 126 |
|
| 127 |
sub yield { |
| 128 |
$current->ready; |
| 129 |
&schedule; |
| 130 |
} |
| 131 |
|
| 132 |
=item terminate |
| 133 |
|
| 134 |
Terminates the current process. |
| 135 |
|
| 136 |
=cut |
| 137 |
|
| 138 |
sub terminate { |
| 139 |
&schedule; |
| 140 |
} |
| 141 |
|
| 142 |
=back |
| 143 |
|
| 144 |
# dynamic methods |
| 145 |
|
| 146 |
=head2 PROCESS METHODS |
| 147 |
|
| 148 |
These are the methods you can call on process objects. |
| 149 |
|
| 150 |
=over 4 |
| 151 |
|
| 152 |
=item new Coro::Process \⊂ |
| 153 |
|
| 154 |
Create a new process, put it into the ready queue and return it. When the |
| 155 |
sub returns the process automatically terminates. |
| 156 |
|
| 157 |
=cut |
| 158 |
|
| 159 |
sub new { |
| 160 |
my $class = shift; |
| 161 |
my $proc = shift; |
| 162 |
my $self = $class->SUPER::new($proc ? sub { &$proc; &terminate } : $proc); |
| 163 |
$self->ready; |
| 164 |
$self; |
| 165 |
} |
| 166 |
|
| 167 |
=item $process->ready |
| 168 |
|
| 169 |
Put the current process into the ready queue. |
| 170 |
|
| 171 |
=cut |
| 172 |
|
| 173 |
sub ready { |
| 174 |
push @ready, $_[0]; |
| 175 |
} |
| 176 |
|
| 177 |
=back |
| 178 |
|
| 179 |
=cut |
| 180 |
|
| 181 |
1; |
| 182 |
|
| 183 |
=head1 AUTHOR |
| 184 |
|
| 185 |
Marc Lehmann <pcg@goof.com> |
| 186 |
http://www.goof.com/pcg/marc/ |
| 187 |
|
| 188 |
=cut |
| 189 |
|
