| 1 |
root |
1.1 |
=head1 NAME |
| 2 |
|
|
|
| 3 |
|
|
Linux::AIO - linux-specific aio implemented using clone |
| 4 |
|
|
|
| 5 |
|
|
=head1 SYNOPSIS |
| 6 |
|
|
|
| 7 |
|
|
use Linux::AIO; |
| 8 |
|
|
|
| 9 |
|
|
=head1 DESCRIPTION |
| 10 |
|
|
|
| 11 |
root |
1.3 |
This module implements asynchroneous i/o using the means available to |
| 12 |
|
|
linux - clone. It does not hook into the POSIX aio_* functions because |
| 13 |
|
|
linux does not yet support these in the kernel. Instead, a number of |
| 14 |
|
|
threads are started that execute your read/writes and signal their |
| 15 |
|
|
completion. |
| 16 |
|
|
|
| 17 |
root |
1.1 |
=over 4 |
| 18 |
|
|
|
| 19 |
|
|
=cut |
| 20 |
|
|
|
| 21 |
|
|
package Linux::AIO; |
| 22 |
|
|
|
| 23 |
root |
1.2 |
use base 'Exporter'; |
| 24 |
|
|
|
| 25 |
root |
1.1 |
BEGIN { |
| 26 |
root |
1.7 |
$VERSION = 0.01; |
| 27 |
root |
1.1 |
|
| 28 |
root |
1.5 |
@EXPORT = qw(aio_read aio_write aio_open aio_close); |
| 29 |
root |
1.2 |
@EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel nreqs); |
| 30 |
|
|
|
| 31 |
root |
1.1 |
require XSLoader; |
| 32 |
|
|
XSLoader::load Linux::AIO, $VERSION; |
| 33 |
|
|
} |
| 34 |
|
|
|
| 35 |
|
|
=item Linux::AIO::min_parallel($nthreads) |
| 36 |
|
|
|
| 37 |
root |
1.3 |
Set the minimum number of AIO threads to $nthreads. You I<have> to call |
| 38 |
|
|
this function with a positive number at leats once, otherwise no threads |
| 39 |
|
|
will be started and you aio-operations will seem to hang. |
| 40 |
root |
1.1 |
|
| 41 |
root |
1.2 |
=item $fileno = Linux::AIO::poll_fileno |
| 42 |
|
|
|
| 43 |
|
|
Return the request result pipe filehandle. This filehandle must be polled |
| 44 |
|
|
for reading. If the pipe becomes readable you have to call C<poll_cb>. |
| 45 |
|
|
|
| 46 |
|
|
=item Linux::AIO::poll_cb |
| 47 |
|
|
|
| 48 |
|
|
Process all outstanding events on the result pipe. You have to call this |
| 49 |
|
|
regularly. Returns the number of events processed. |
| 50 |
|
|
|
| 51 |
root |
1.3 |
You can use Event to multiplex, e.g.: |
| 52 |
|
|
|
| 53 |
|
|
Event->io(fd => Linux::AIO::poll_fileno, |
| 54 |
|
|
poll => 'r', async => 1, |
| 55 |
|
|
cb => \&Linux::AIO::poll_cb ); |
| 56 |
|
|
|
| 57 |
|
|
|
| 58 |
root |
1.2 |
=item Linux::AIO::nreqs |
| 59 |
|
|
|
| 60 |
|
|
Returns the number of requests currently outstanding. |
| 61 |
root |
1.4 |
|
| 62 |
|
|
=item aio_read($fh,$offset,$length, $data,$dataoffset,$callback) |
| 63 |
|
|
aio_write($fh,$offset,$length, $data,$dataoffset,$callback) |
| 64 |
|
|
|
| 65 |
|
|
Reads or writes C<length> bytes from the specified C<fh> and C<offset> |
| 66 |
|
|
into the scalar given by C<data> and offset C<dataoffset> and calls the |
| 67 |
|
|
callback without the actual number of bytes read (or undef on error). |
| 68 |
|
|
|
| 69 |
|
|
=item aio_open($pathname, $flags, $mode, $callback) |
| 70 |
|
|
|
| 71 |
|
|
Asynchronously open or create a file and call the callback with the |
| 72 |
|
|
filedescriptor. |
| 73 |
root |
1.5 |
|
| 74 |
|
|
=item aio_close($fh, $callback) |
| 75 |
|
|
|
| 76 |
|
|
Asynchronously close a file and call the callback with the result code. |
| 77 |
root |
1.2 |
|
| 78 |
root |
1.1 |
=cut |
| 79 |
root |
1.2 |
|
| 80 |
|
|
END { |
| 81 |
|
|
max_parallel 0; |
| 82 |
|
|
} |
| 83 |
root |
1.1 |
|
| 84 |
|
|
1; |
| 85 |
|
|
|
| 86 |
|
|
=back |
| 87 |
|
|
|
| 88 |
|
|
=head1 BUGS |
| 89 |
|
|
|
| 90 |
|
|
This module has not yet been extensively tested. Watch out! |
| 91 |
|
|
|
| 92 |
root |
1.6 |
- aio_stat/lstat are seriously missing here. |
| 93 |
|
|
|
| 94 |
root |
1.1 |
=head1 SEE ALSO |
| 95 |
|
|
|
| 96 |
|
|
L<Coro>. |
| 97 |
|
|
|
| 98 |
|
|
=head1 AUTHOR |
| 99 |
|
|
|
| 100 |
|
|
Marc Lehmann <pcg@goof.com> |
| 101 |
|
|
http://www.goof.com/pcg/marc/ |
| 102 |
|
|
|
| 103 |
|
|
=cut |
| 104 |
|
|
|
