1 |
root |
1.1 |
=head1 NAME |
2 |
|
|
|
3 |
|
|
Coro::Storable - offer a more fine-grained Storable interface |
4 |
|
|
|
5 |
|
|
=head1 SYNOPSIS |
6 |
|
|
|
7 |
|
|
use Coro::Storable; |
8 |
|
|
|
9 |
|
|
=head1 DESCRIPTION |
10 |
|
|
|
11 |
|
|
This module implements a few functions from the Storable module in a way |
12 |
|
|
so that it cede's more often. Some applications (such as the Crossfire |
13 |
|
|
game server) sometimes need to load large Storable objects without |
14 |
|
|
blocking the server for a long time. |
15 |
|
|
|
16 |
root |
1.2 |
As it seems that Storable is not reentrant, this module also serialises |
17 |
|
|
calls to freeze and thaw between coroutines. |
18 |
|
|
|
19 |
root |
1.1 |
=head1 FUNCTIONS |
20 |
|
|
|
21 |
|
|
=over 4 |
22 |
|
|
|
23 |
|
|
=item $ref = thaw $pst |
24 |
|
|
|
25 |
|
|
Retrieve an object from the given $pst, which must have been created with |
26 |
|
|
C<Coro::Storable::freeze> or C<Storable::store_fd>/C<Storable::store> |
27 |
|
|
(sorry, but Storable uses incompatible formats for disk/mem objects). |
28 |
|
|
|
29 |
|
|
This works by calling C<Coro::cede> for every 512 bytes read in. |
30 |
|
|
|
31 |
|
|
=item $pst = freeze $ref |
32 |
|
|
|
33 |
|
|
Freeze the given scalar into a Storable object. It uses the same format as |
34 |
|
|
C<Storable::nstore_fd> (note the C<n>). |
35 |
|
|
|
36 |
|
|
This works by calling C<Coro::cede> for every write that Storable |
37 |
|
|
issues. Unfortunately, Storable often makes many very small writes, so it |
38 |
|
|
is rather inefficient. But it does keep the latency low. |
39 |
|
|
|
40 |
|
|
=back |
41 |
|
|
|
42 |
|
|
=cut |
43 |
|
|
|
44 |
|
|
package Coro::Storable; |
45 |
|
|
|
46 |
|
|
use strict; |
47 |
|
|
|
48 |
|
|
use Coro (); |
49 |
root |
1.2 |
use Coro::Semaphore (); |
50 |
root |
1.1 |
|
51 |
|
|
use Storable; |
52 |
|
|
use base "Exporter"; |
53 |
|
|
|
54 |
|
|
our $VERSION = '0.1'; |
55 |
|
|
our @EXPORT = qw(freeze thaw); |
56 |
|
|
|
57 |
root |
1.2 |
my $lock = new Coro::Semaphore; |
58 |
|
|
|
59 |
root |
1.1 |
sub freeze($) { |
60 |
root |
1.2 |
my $guard = $lock->guard; |
61 |
|
|
|
62 |
root |
1.1 |
open my $fh, ">:via(CoroCede)", \my $buf |
63 |
|
|
or die "cannot open pst via CoroCede: $!"; |
64 |
|
|
Storable::nstore_fd $_[0], $fh; |
65 |
|
|
$buf |
66 |
|
|
} |
67 |
|
|
|
68 |
|
|
sub thaw($) { |
69 |
root |
1.2 |
my $guard = $lock->guard; |
70 |
|
|
|
71 |
root |
1.1 |
open my $fh, "<:via(CoroCede)", \$_[0] |
72 |
|
|
or die "cannot open pst via CoroCede: $!"; |
73 |
|
|
Storable::fd_retrieve $fh |
74 |
|
|
} |
75 |
|
|
|
76 |
|
|
package PerlIO::via::CoroCede; |
77 |
|
|
|
78 |
|
|
# generic cede-on-read/write filtering layer |
79 |
|
|
|
80 |
|
|
sub PUSHED { |
81 |
|
|
__PACKAGE__ |
82 |
|
|
} |
83 |
|
|
|
84 |
|
|
sub FILL { |
85 |
|
|
Coro::cede; |
86 |
|
|
read $_[1], my $buf, 512; |
87 |
|
|
$buf |
88 |
|
|
} |
89 |
|
|
|
90 |
|
|
sub WRITE { |
91 |
|
|
Coro::cede; |
92 |
|
|
(print {$_[2]} $_[1]) ? length $_[1] : -1 |
93 |
|
|
} |
94 |
|
|
|
95 |
|
|
1; |
96 |
|
|
|
97 |
|
|
=head1 AUTHOR |
98 |
|
|
|
99 |
|
|
Marc Lehmann <schmorp@schmorp.de> |
100 |
|
|
http://home.schmorp.de/ |
101 |
|
|
|
102 |
|
|
=cut |
103 |
|
|
|
104 |
|
|
|