| 1 |
=head1 NAME |
| 2 |
|
| 3 |
Coro::AIO - truly asynchronous file and directrory I/O |
| 4 |
|
| 5 |
=head1 SYNOPSIS |
| 6 |
|
| 7 |
use Coro::AIO; |
| 8 |
|
| 9 |
# can now use any of the aio requests your IO::AIO module supports. |
| 10 |
|
| 11 |
# read 1MB of /etc/passwd, without blocking other coroutines |
| 12 |
my $fh = aio_open "/etc/passwd", O_RDONLY, 0 |
| 13 |
or die "/etc/passwd: $!"; |
| 14 |
aio_read $fh, 0, 1_000_000, my $buf, 0 |
| 15 |
or die "aio_read: $!"; |
| 16 |
aio_close $fh; |
| 17 |
|
| 18 |
=head1 DESCRIPTION |
| 19 |
|
| 20 |
This module is an L<AnyEvent> user, you need to make sure that you use and |
| 21 |
run a supported event loop. |
| 22 |
|
| 23 |
This module implements a thin wrapper around L<IO::AIO|IO::AIO>. All of |
| 24 |
the functions that expect a callback are being wrapped by this module. |
| 25 |
|
| 26 |
The API is exactly the same as that of the corresponding IO::AIO routines, |
| 27 |
except that you have to specify I<all> arguments I<except> the callback |
| 28 |
argument. Instead the routines return the values normally passed to the |
| 29 |
callback. Everything else, including C<$!> and perls stat cache, are set |
| 30 |
as expected after these functions return. |
| 31 |
|
| 32 |
You can mix calls to C<IO::AIO> functions with calls to this module. You |
| 33 |
I<must not>, however, call these routines from within IO::AIO callbacks, |
| 34 |
as this causes a deadlock. Start a coro inside the callback instead. |
| 35 |
|
| 36 |
You also can, but do not need to, call C<IO::AIO::poll_cb>, as this |
| 37 |
module automatically installs an event watcher for the C<IO::AIO> file |
| 38 |
descriptor. It uses the L<AnyEvent> module for this, so please refer to |
| 39 |
its documentation on how it selects an appropriate Event module. |
| 40 |
|
| 41 |
The AnyEvent watcher can be disabled by executing C<undef |
| 42 |
$Coro::AIO::WATCHER>. Please notify the author of when and why you think |
| 43 |
this was necessary. |
| 44 |
|
| 45 |
All other functions exported by default by IO::AIO (e.g. C<aioreq_pri>) |
| 46 |
will be exported by default by Coro::AIO, too. |
| 47 |
|
| 48 |
Functions that can be optionally imported from IO::AIO can be imported |
| 49 |
from Coro::AIO or can be called directly, e.g. C<Coro::AIO::nreqs>. |
| 50 |
|
| 51 |
You cannot specify priorities with C<aioreq_pri>, as this module |
| 52 |
overwrites the request priority with the current coroutine priority at all |
| 53 |
times. |
| 54 |
|
| 55 |
For your convienience, here are the changed function signatures for most |
| 56 |
of the requests, for documentation of these functions please have a look |
| 57 |
at L<IO::AIO|the IO::AIO manual>. Note that requests added by newer |
| 58 |
versions of L<IO::AIO> will be automatically wrapped as well. |
| 59 |
|
| 60 |
=over 4 |
| 61 |
|
| 62 |
=cut |
| 63 |
|
| 64 |
package Coro::AIO; |
| 65 |
|
| 66 |
use strict qw(subs vars); |
| 67 |
|
| 68 |
use Coro (); |
| 69 |
use AnyEvent (); |
| 70 |
use IO::AIO (); |
| 71 |
|
| 72 |
use base Exporter::; |
| 73 |
|
| 74 |
our $WATCHER; |
| 75 |
|
| 76 |
$WATCHER = AnyEvent::post_detect { |
| 77 |
if ($AnyEvent::MODEL eq "AnyEvent::Impl::EV") { |
| 78 |
$WATCHER = EV::io (IO::AIO::poll_fileno, &EV::READ, \&IO::AIO::poll_cb); |
| 79 |
} else { |
| 80 |
our $FH; open $FH, "<&=" . IO::AIO::poll_fileno; |
| 81 |
$WATCHER = AnyEvent->io (fh => $FH, poll => 'r', cb => \&IO::AIO::poll_cb); |
| 82 |
} |
| 83 |
}; |
| 84 |
|
| 85 |
our @EXPORT = @IO::AIO::EXPORT; |
| 86 |
our @EXPORT_OK = @IO::AIO::EXPORT_OK; |
| 87 |
our $AUTOLOAD; |
| 88 |
|
| 89 |
{ |
| 90 |
my @reqs = @IO::AIO::AIO_REQ ? @IO::AIO::AIO_REQ : @EXPORT; |
| 91 |
my %reqs = map +($_ => 1), @reqs; |
| 92 |
|
| 93 |
eval |
| 94 |
join "", |
| 95 |
map "sub $_(" . (prototype "IO::AIO::$_") . ");", |
| 96 |
grep !$reqs{$_}, |
| 97 |
@EXPORT, @EXPORT_OK; |
| 98 |
|
| 99 |
for my $sub (@reqs) { |
| 100 |
push @EXPORT, $sub; |
| 101 |
|
| 102 |
my $iosub = "IO::AIO::$sub"; |
| 103 |
my $proto = prototype $iosub; |
| 104 |
|
| 105 |
$proto =~ s/;?\$$// or die "$iosub: unable to remove callback slot from prototype"; |
| 106 |
|
| 107 |
eval qq{ |
| 108 |
#line 1 "Coro::AIO::$sub($proto)" |
| 109 |
sub $sub($proto) { |
| 110 |
my \$current = \$Coro::current; |
| 111 |
my \$state; |
| 112 |
my \@res; |
| 113 |
|
| 114 |
push \@_, sub { |
| 115 |
\$state = _get_state; |
| 116 |
\@res = \@_; |
| 117 |
\$current->ready; |
| 118 |
}; |
| 119 |
|
| 120 |
aioreq_pri \$Coro::current->prio; |
| 121 |
&$iosub; |
| 122 |
|
| 123 |
&Coro::schedule; |
| 124 |
&Coro::schedule while !\$state; |
| 125 |
|
| 126 |
_set_state \$state; |
| 127 |
wantarray ? \@res : \$res[0] |
| 128 |
} |
| 129 |
}; |
| 130 |
die if $@; |
| 131 |
} |
| 132 |
} |
| 133 |
|
| 134 |
sub AUTOLOAD { |
| 135 |
(my $func = $AUTOLOAD) =~ s/^.*:://; |
| 136 |
*$AUTOLOAD = \&{"IO::AIO::$func"}; |
| 137 |
goto &$AUTOLOAD; |
| 138 |
} |
| 139 |
|
| 140 |
=item $fh = aio_open $pathname, $flags, $mode |
| 141 |
|
| 142 |
=item $status = aio_close $fh |
| 143 |
|
| 144 |
=item $retval = aio_read $fh,$offset,$length, $data,$dataoffset |
| 145 |
|
| 146 |
=item $retval = aio_write $fh,$offset,$length, $data,$dataoffset |
| 147 |
|
| 148 |
=item $retval = aio_sendfile $out_fh, $in_fh, $in_offset, $length |
| 149 |
|
| 150 |
=item $retval = aio_readahead $fh,$offset,$length |
| 151 |
|
| 152 |
=item $status = aio_stat $fh_or_path |
| 153 |
|
| 154 |
=item $status = aio_lstat $fh |
| 155 |
|
| 156 |
=item $status = aio_unlink $pathname |
| 157 |
|
| 158 |
=item $status = aio_rmdir $pathname |
| 159 |
|
| 160 |
=item $entries = aio_readdir $pathname |
| 161 |
|
| 162 |
=item ($dirs, $nondirs) = aio_scandir $path, $maxreq |
| 163 |
|
| 164 |
=item $status = aio_fsync $fh |
| 165 |
|
| 166 |
=item $status = aio_fdatasync $fh |
| 167 |
|
| 168 |
=item ... = aio_xxx ... |
| 169 |
|
| 170 |
Any additional aio requests follow the same scheme: same parameters except |
| 171 |
you must not specify a callback but instead get the callback arguments as |
| 172 |
return values. |
| 173 |
|
| 174 |
=back |
| 175 |
|
| 176 |
=head1 SEE ALSO |
| 177 |
|
| 178 |
L<Coro::Socket> and L<Coro::Handle> for non-blocking socket operation. |
| 179 |
|
| 180 |
=head1 AUTHOR |
| 181 |
|
| 182 |
Marc Lehmann <schmorp@schmorp.de> |
| 183 |
http://home.schmorp.de/ |
| 184 |
|
| 185 |
=cut |
| 186 |
|
| 187 |
1 |
