AIO(3) User Contributed Perl Documentation AIO(3)NAMECoro::AIO - truly asynchronous file and directory I/O
SYNOPSIS
use Coro::AIO;
# can now use any of the aio requests your IO::AIO module supports.
# read 1MB of /etc/passwd, without blocking other coroutines
my $fh = aio_open "/etc/passwd", O_RDONLY, 0
or die "/etc/passwd: $!";
aio_read $fh, 0, 1_000_000, my $buf, 0
or die "aio_read: $!";
aio_close $fh;
DESCRIPTION
This module is an AnyEvent user, you need to make sure that you use and
run a supported event loop.
This module implements a thin wrapper around IO::AIO. All of the
functions that expect a callback are being wrapped by this module.
The API is exactly the same as that of the corresponding IO::AIO
routines, except that you have to specify all arguments, even the ones
optional in IO::AIO, except the callback argument. Instead of calling a
callback, the routines return the values normally passed to the
callback. Everything else, including $! and perls stat cache, are set
as expected after these functions return.
You can mix calls to "IO::AIO" functions with calls to this module. You
must not, however, call these routines from within IO::AIO callbacks,
as this causes a deadlock. Start a coro inside the callback instead.
This module also loads AnyEvent::AIO to integrate into the event loop
in use, so please refer to its (and AnyEvent's) documentation on how it
selects an appropriate event module.
All other functions exported by default by IO::AIO (e.g. "aioreq_pri")
will be exported by default by Coro::AIO, too.
Functions that can be optionally imported from IO::AIO can be imported
from Coro::AIO or can be called directly, e.g. "Coro::AIO::nreqs".
You cannot specify priorities with "aioreq_pri" if your coroutine has a
non-zero priority, as this module overwrites the request priority with
the current coroutine priority in that case.
For your convenience, here are the changed function signatures for most
of the requests, for documentation of these functions please have a
look at IO::AIO. Note that requests added by newer versions of IO::AIO
will be automatically wrapped as well.
@results = aio_wait $req
This is not originally an IO::AIO request: what it does is to wait
for $req to finish and return the results. This is most useful with
"aio_group" requests.
Is currently implemented by replacing the $req callback (and is
very much like a wrapper around "$req->cb ()").
$fh = aio_open $pathname, $flags, $mode
$status = aio_close $fh
$retval = aio_read $fh,$offset,$length, $data,$dataoffset
$retval = aio_write $fh,$offset,$length, $data,$dataoffset
$retval = aio_sendfile $out_fh, $in_fh, $in_offset, $length
$retval = aio_readahead $fh,$offset,$length
$status = aio_stat $fh_or_path
$status = aio_lstat $fh
$status = aio_unlink $pathname
$status = aio_rmdir $pathname
$entries = aio_readdir $pathname
($dirs, $nondirs) = aio_scandir $path, $maxreq
$status = aio_fsync $fh
$status = aio_fdatasync $fh
... = aio_xxx ...
Any additional aio requests follow the same scheme: same parameters
except you must not specify a callback but instead get the callback
arguments as return values.
SEE ALSO
Coro::Socket and Coro::Handle for non-blocking socket operation.
AUTHOR
Marc Lehmann <schmorp@schmorp.de>
http://home.schmorp.de/
perl v5.14.2 2011-11-11 AIO(3)