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1.1 |
=head1 NAME |
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IO::AIO - Asynchronous Input/Output |
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=head1 SYNOPSIS |
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use IO::AIO; |
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aio_open "/etc/passwd", O_RDONLY, 0, sub { |
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my $fh = shift |
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or die "/etc/passwd: $!"; |
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... |
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}; |
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aio_unlink "/tmp/file", sub { }; |
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aio_read $fh, 30000, 1024, $buffer, 0, sub { |
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$_[0] > 0 or die "read error: $!"; |
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}; |
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# version 2+ has request and group objects |
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use IO::AIO 2; |
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|
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aioreq_pri 4; # give next request a very high priority |
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my $req = aio_unlink "/tmp/file", sub { }; |
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$req->cancel; # cancel request if still in queue |
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my $grp = aio_group sub { print "all stats done\n" }; |
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add $grp aio_stat "..." for ...; |
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# AnyEvent integration (EV, Event, Glib, Tk, POE, urxvt, pureperl...) |
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use AnyEvent::AIO; |
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|
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# EV integration |
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my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb; |
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|
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# Event integration |
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Event->io (fd => IO::AIO::poll_fileno, |
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poll => 'r', |
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cb => \&IO::AIO::poll_cb); |
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# Glib/Gtk2 integration |
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add_watch Glib::IO IO::AIO::poll_fileno, |
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in => sub { IO::AIO::poll_cb; 1 }; |
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|
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# Tk integration |
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Tk::Event::IO->fileevent (IO::AIO::poll_fileno, "", |
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readable => \&IO::AIO::poll_cb); |
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# Danga::Socket integration |
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Danga::Socket->AddOtherFds (IO::AIO::poll_fileno => |
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\&IO::AIO::poll_cb); |
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1.1 |
=head1 DESCRIPTION |
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This module implements asynchronous I/O using whatever means your |
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operating system supports. It is implemented as an interface to C<libeio> |
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(L<http://software.schmorp.de/pkg/libeio.html>). |
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Asynchronous means that operations that can normally block your program |
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(e.g. reading from disk) will be done asynchronously: the operation |
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will still block, but you can do something else in the meantime. This |
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is extremely useful for programs that need to stay interactive even |
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when doing heavy I/O (GUI programs, high performance network servers |
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etc.), but can also be used to easily do operations in parallel that are |
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normally done sequentially, e.g. stat'ing many files, which is much faster |
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on a RAID volume or over NFS when you do a number of stat operations |
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concurrently. |
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While most of this works on all types of file descriptors (for |
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example sockets), using these functions on file descriptors that |
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support nonblocking operation (again, sockets, pipes etc.) is |
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very inefficient. Use an event loop for that (such as the L<EV> |
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module): IO::AIO will naturally fit into such an event loop itself. |
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|
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In this version, a number of threads are started that execute your |
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requests and signal their completion. You don't need thread support |
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in perl, and the threads created by this module will not be visible |
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to perl. In the future, this module might make use of the native aio |
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functions available on many operating systems. However, they are often |
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not well-supported or restricted (GNU/Linux doesn't allow them on normal |
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files currently, for example), and they would only support aio_read and |
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aio_write, so the remaining functionality would have to be implemented |
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using threads anyway. |
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Although the module will work in the presence of other (Perl-) threads, |
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it is currently not reentrant in any way, so use appropriate locking |
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yourself, always call C<poll_cb> from within the same thread, or never |
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call C<poll_cb> (or other C<aio_> functions) recursively. |
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=head2 EXAMPLE |
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This is a simple example that uses the EV module and loads |
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F</etc/passwd> asynchronously: |
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use Fcntl; |
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use EV; |
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use IO::AIO; |
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# register the IO::AIO callback with EV |
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my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb; |
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# queue the request to open /etc/passwd |
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aio_open "/etc/passwd", O_RDONLY, 0, sub { |
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my $fh = shift |
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or die "error while opening: $!"; |
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# stat'ing filehandles is generally non-blocking |
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my $size = -s $fh; |
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# queue a request to read the file |
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my $contents; |
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aio_read $fh, 0, $size, $contents, 0, sub { |
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$_[0] == $size |
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or die "short read: $!"; |
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close $fh; |
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# file contents now in $contents |
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print $contents; |
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# exit event loop and program |
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EV::unloop; |
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}; |
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}; |
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# possibly queue up other requests, or open GUI windows, |
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# check for sockets etc. etc. |
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# process events as long as there are some: |
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EV::loop; |
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|
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=head1 REQUEST ANATOMY AND LIFETIME |
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Every C<aio_*> function creates a request. which is a C data structure not |
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directly visible to Perl. |
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If called in non-void context, every request function returns a Perl |
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object representing the request. In void context, nothing is returned, |
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which saves a bit of memory. |
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The perl object is a fairly standard ref-to-hash object. The hash contents |
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are not used by IO::AIO so you are free to store anything you like in it. |
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During their existance, aio requests travel through the following states, |
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in order: |
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=over 4 |
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=item ready |
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Immediately after a request is created it is put into the ready state, |
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waiting for a thread to execute it. |
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=item execute |
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A thread has accepted the request for processing and is currently |
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executing it (e.g. blocking in read). |
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=item pending |
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The request has been executed and is waiting for result processing. |
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While request submission and execution is fully asynchronous, result |
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processing is not and relies on the perl interpreter calling C<poll_cb> |
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(or another function with the same effect). |
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=item result |
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The request results are processed synchronously by C<poll_cb>. |
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The C<poll_cb> function will process all outstanding aio requests by |
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calling their callbacks, freeing memory associated with them and managing |
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any groups they are contained in. |
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=item done |
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Request has reached the end of its lifetime and holds no resources anymore |
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(except possibly for the Perl object, but its connection to the actual |
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aio request is severed and calling its methods will either do nothing or |
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result in a runtime error). |
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1.1 |
|
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1.88 |
=back |
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1.1 |
=cut |
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package IO::AIO; |
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1.117 |
use Carp (); |
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no warnings; |
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1.51 |
use strict 'vars'; |
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1.23 |
|
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1.1 |
use base 'Exporter'; |
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BEGIN { |
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our $VERSION = '3.23'; |
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1.1 |
|
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our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close |
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aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx |
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aio_scandir aio_symlink aio_readlink aio_sync aio_fsync |
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1.142 |
aio_fdatasync aio_sync_file_range aio_pathsync aio_readahead |
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1.120 |
aio_rename aio_link aio_move aio_copy aio_group |
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aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown |
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aio_chmod aio_utime aio_truncate); |
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our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
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our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
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1.86 |
min_parallel max_parallel max_idle |
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nreqs nready npending nthreads |
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max_poll_time max_poll_reqs |
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sendfile fadvise); |
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|
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push @AIO_REQ, qw(aio_busy); # not exported |
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@IO::AIO::GRP::ISA = 'IO::AIO::REQ'; |
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1.1 |
require XSLoader; |
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1.51 |
XSLoader::load ("IO::AIO", $VERSION); |
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1.1 |
} |
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1.5 |
=head1 FUNCTIONS |
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|
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=head2 AIO REQUEST FUNCTIONS |
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|
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All the C<aio_*> calls are more or less thin wrappers around the syscall |
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with the same name (sans C<aio_>). The arguments are similar or identical, |
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1.14 |
and they all accept an additional (and optional) C<$callback> argument |
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which must be a code reference. This code reference will get called with |
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the syscall return code (e.g. most syscalls return C<-1> on error, unlike |
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perl, which usually delivers "false") as its sole argument after the given |
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1.14 |
syscall has been executed asynchronously. |
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1.1 |
|
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1.23 |
All functions expecting a filehandle keep a copy of the filehandle |
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internally until the request has finished. |
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1.1 |
|
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All functions return request objects of type L<IO::AIO::REQ> that allow |
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further manipulation of those requests while they are in-flight. |
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1.52 |
|
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1.28 |
The pathnames you pass to these routines I<must> be absolute and |
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1.87 |
encoded as octets. The reason for the former is that at the time the |
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1.28 |
request is being executed, the current working directory could have |
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changed. Alternatively, you can make sure that you never change the |
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current working directory anywhere in the program and then use relative |
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paths. |
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1.28 |
|
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1.87 |
To encode pathnames as octets, either make sure you either: a) always pass |
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in filenames you got from outside (command line, readdir etc.) without |
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tinkering, b) are ASCII or ISO 8859-1, c) use the Encode module and encode |
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your pathnames to the locale (or other) encoding in effect in the user |
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environment, d) use Glib::filename_from_unicode on unicode filenames or e) |
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use something else to ensure your scalar has the correct contents. |
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This works, btw. independent of the internal UTF-8 bit, which IO::AIO |
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1.136 |
handles correctly whether it is set or not. |
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1.1 |
|
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1.5 |
=over 4 |
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1.1 |
|
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1.80 |
=item $prev_pri = aioreq_pri [$pri] |
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1.68 |
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1.80 |
Returns the priority value that would be used for the next request and, if |
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C<$pri> is given, sets the priority for the next aio request. |
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1.68 |
|
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1.80 |
The default priority is C<0>, the minimum and maximum priorities are C<-4> |
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and C<4>, respectively. Requests with higher priority will be serviced |
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first. |
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The priority will be reset to C<0> after each call to one of the C<aio_*> |
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1.68 |
functions. |
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Example: open a file with low priority, then read something from it with |
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higher priority so the read request is serviced before other low priority |
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open requests (potentially spamming the cache): |
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aioreq_pri -3; |
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aio_open ..., sub { |
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return unless $_[0]; |
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aioreq_pri -2; |
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aio_read $_[0], ..., sub { |
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... |
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}; |
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}; |
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1.106 |
|
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1.69 |
=item aioreq_nice $pri_adjust |
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Similar to C<aioreq_pri>, but subtracts the given value from the current |
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1.87 |
priority, so the effect is cumulative. |
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1.69 |
|
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1.106 |
|
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1.40 |
=item aio_open $pathname, $flags, $mode, $callback->($fh) |
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1.1 |
|
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1.2 |
Asynchronously open or create a file and call the callback with a newly |
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created filehandle for the file. |
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1.1 |
|
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The pathname passed to C<aio_open> must be absolute. See API NOTES, above, |
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for an explanation. |
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1.20 |
The C<$flags> argument is a bitmask. See the C<Fcntl> module for a |
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list. They are the same as used by C<sysopen>. |
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Likewise, C<$mode> specifies the mode of the newly created file, if it |
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didn't exist and C<O_CREAT> has been given, just like perl's C<sysopen>, |
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except that it is mandatory (i.e. use C<0> if you don't create new files, |
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1.101 |
and C<0666> or C<0777> if you do). Note that the C<$mode> will be modified |
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by the umask in effect then the request is being executed, so better never |
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change the umask. |
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1.1 |
|
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Example: |
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aio_open "/etc/passwd", O_RDONLY, 0, sub { |
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1.2 |
if ($_[0]) { |
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print "open successful, fh is $_[0]\n"; |
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1.1 |
... |
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} else { |
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die "open failed: $!\n"; |
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} |
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}; |
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1.106 |
|
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1.40 |
=item aio_close $fh, $callback->($status) |
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1.1 |
|
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1.2 |
Asynchronously close a file and call the callback with the result |
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1.116 |
code. |
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|
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1.117 |
Unfortunately, you can't do this to perl. Perl I<insists> very strongly on |
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1.121 |
closing the file descriptor associated with the filehandle itself. |
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1.117 |
|
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1.121 |
Therefore, C<aio_close> will not close the filehandle - instead it will |
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use dup2 to overwrite the file descriptor with the write-end of a pipe |
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(the pipe fd will be created on demand and will be cached). |
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1.117 |
|
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1.121 |
Or in other words: the file descriptor will be closed, but it will not be |
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free for reuse until the perl filehandle is closed. |
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1.117 |
|
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=cut |
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|
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1.40 |
=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
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1.1 |
|
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1.40 |
=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
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1.1 |
|
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1.145 |
Reads or writes C<$length> bytes from or to the specified C<$fh> and |
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C<$offset> into the scalar given by C<$data> and offset C<$dataoffset> |
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and calls the callback without the actual number of bytes read (or -1 on |
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error, just like the syscall). |
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1.109 |
|
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1.146 |
C<aio_read> will, like C<sysread>, shrink or grow the C<$data> scalar to |
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offset plus the actual number of bytes read. |
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|
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1.112 |
If C<$offset> is undefined, then the current file descriptor offset will |
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|
|
be used (and updated), otherwise the file descriptor offset will not be |
353 |
|
|
changed by these calls. |
354 |
root |
1.109 |
|
355 |
root |
1.145 |
If C<$length> is undefined in C<aio_write>, use the remaining length of |
356 |
|
|
C<$data>. |
357 |
root |
1.109 |
|
358 |
|
|
If C<$dataoffset> is less than zero, it will be counted from the end of |
359 |
|
|
C<$data>. |
360 |
root |
1.1 |
|
361 |
root |
1.31 |
The C<$data> scalar I<MUST NOT> be modified in any way while the request |
362 |
root |
1.108 |
is outstanding. Modifying it can result in segfaults or World War III (if |
363 |
|
|
the necessary/optional hardware is installed). |
364 |
root |
1.31 |
|
365 |
root |
1.17 |
Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at |
366 |
root |
1.1 |
offset C<0> within the scalar: |
367 |
|
|
|
368 |
|
|
aio_read $fh, 7, 15, $buffer, 0, sub { |
369 |
root |
1.9 |
$_[0] > 0 or die "read error: $!"; |
370 |
|
|
print "read $_[0] bytes: <$buffer>\n"; |
371 |
root |
1.1 |
}; |
372 |
|
|
|
373 |
root |
1.106 |
|
374 |
root |
1.40 |
=item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
375 |
root |
1.35 |
|
376 |
|
|
Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts |
377 |
|
|
reading at byte offset C<$in_offset>, and starts writing at the current |
378 |
|
|
file offset of C<$out_fh>. Because of that, it is not safe to issue more |
379 |
|
|
than one C<aio_sendfile> per C<$out_fh>, as they will interfere with each |
380 |
|
|
other. |
381 |
|
|
|
382 |
|
|
This call tries to make use of a native C<sendfile> syscall to provide |
383 |
|
|
zero-copy operation. For this to work, C<$out_fh> should refer to a |
384 |
|
|
socket, and C<$in_fh> should refer to mmap'able file. |
385 |
|
|
|
386 |
|
|
If the native sendfile call fails or is not implemented, it will be |
387 |
root |
1.36 |
emulated, so you can call C<aio_sendfile> on any type of filehandle |
388 |
|
|
regardless of the limitations of the operating system. |
389 |
root |
1.35 |
|
390 |
|
|
Please note, however, that C<aio_sendfile> can read more bytes from |
391 |
|
|
C<$in_fh> than are written, and there is no way to find out how many |
392 |
root |
1.36 |
bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only |
393 |
|
|
provides the number of bytes written to C<$out_fh>. Only if the result |
394 |
|
|
value equals C<$length> one can assume that C<$length> bytes have been |
395 |
|
|
read. |
396 |
root |
1.35 |
|
397 |
root |
1.106 |
|
398 |
root |
1.40 |
=item aio_readahead $fh,$offset,$length, $callback->($retval) |
399 |
root |
1.1 |
|
400 |
root |
1.20 |
C<aio_readahead> populates the page cache with data from a file so that |
401 |
root |
1.1 |
subsequent reads from that file will not block on disk I/O. The C<$offset> |
402 |
|
|
argument specifies the starting point from which data is to be read and |
403 |
|
|
C<$length> specifies the number of bytes to be read. I/O is performed in |
404 |
|
|
whole pages, so that offset is effectively rounded down to a page boundary |
405 |
|
|
and bytes are read up to the next page boundary greater than or equal to |
406 |
root |
1.20 |
(off-set+length). C<aio_readahead> does not read beyond the end of the |
407 |
root |
1.1 |
file. The current file offset of the file is left unchanged. |
408 |
|
|
|
409 |
root |
1.26 |
If that syscall doesn't exist (likely if your OS isn't Linux) it will be |
410 |
|
|
emulated by simply reading the data, which would have a similar effect. |
411 |
|
|
|
412 |
root |
1.106 |
|
413 |
root |
1.40 |
=item aio_stat $fh_or_path, $callback->($status) |
414 |
root |
1.1 |
|
415 |
root |
1.40 |
=item aio_lstat $fh, $callback->($status) |
416 |
root |
1.1 |
|
417 |
|
|
Works like perl's C<stat> or C<lstat> in void context. The callback will |
418 |
|
|
be called after the stat and the results will be available using C<stat _> |
419 |
|
|
or C<-s _> etc... |
420 |
|
|
|
421 |
|
|
The pathname passed to C<aio_stat> must be absolute. See API NOTES, above, |
422 |
|
|
for an explanation. |
423 |
|
|
|
424 |
|
|
Currently, the stats are always 64-bit-stats, i.e. instead of returning an |
425 |
|
|
error when stat'ing a large file, the results will be silently truncated |
426 |
|
|
unless perl itself is compiled with large file support. |
427 |
|
|
|
428 |
|
|
Example: Print the length of F</etc/passwd>: |
429 |
|
|
|
430 |
|
|
aio_stat "/etc/passwd", sub { |
431 |
|
|
$_[0] and die "stat failed: $!"; |
432 |
|
|
print "size is ", -s _, "\n"; |
433 |
|
|
}; |
434 |
|
|
|
435 |
root |
1.106 |
|
436 |
|
|
=item aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
437 |
|
|
|
438 |
|
|
Works like perl's C<utime> function (including the special case of $atime |
439 |
|
|
and $mtime being undef). Fractional times are supported if the underlying |
440 |
|
|
syscalls support them. |
441 |
|
|
|
442 |
|
|
When called with a pathname, uses utimes(2) if available, otherwise |
443 |
|
|
utime(2). If called on a file descriptor, uses futimes(2) if available, |
444 |
|
|
otherwise returns ENOSYS, so this is not portable. |
445 |
|
|
|
446 |
|
|
Examples: |
447 |
|
|
|
448 |
root |
1.107 |
# set atime and mtime to current time (basically touch(1)): |
449 |
root |
1.106 |
aio_utime "path", undef, undef; |
450 |
|
|
# set atime to current time and mtime to beginning of the epoch: |
451 |
|
|
aio_utime "path", time, undef; # undef==0 |
452 |
|
|
|
453 |
|
|
|
454 |
|
|
=item aio_chown $fh_or_path, $uid, $gid, $callback->($status) |
455 |
|
|
|
456 |
|
|
Works like perl's C<chown> function, except that C<undef> for either $uid |
457 |
|
|
or $gid is being interpreted as "do not change" (but -1 can also be used). |
458 |
|
|
|
459 |
|
|
Examples: |
460 |
|
|
|
461 |
|
|
# same as "chown root path" in the shell: |
462 |
|
|
aio_chown "path", 0, -1; |
463 |
|
|
# same as above: |
464 |
|
|
aio_chown "path", 0, undef; |
465 |
|
|
|
466 |
|
|
|
467 |
root |
1.110 |
=item aio_truncate $fh_or_path, $offset, $callback->($status) |
468 |
|
|
|
469 |
|
|
Works like truncate(2) or ftruncate(2). |
470 |
|
|
|
471 |
|
|
|
472 |
root |
1.106 |
=item aio_chmod $fh_or_path, $mode, $callback->($status) |
473 |
|
|
|
474 |
|
|
Works like perl's C<chmod> function. |
475 |
|
|
|
476 |
|
|
|
477 |
root |
1.40 |
=item aio_unlink $pathname, $callback->($status) |
478 |
root |
1.1 |
|
479 |
|
|
Asynchronously unlink (delete) a file and call the callback with the |
480 |
|
|
result code. |
481 |
|
|
|
482 |
root |
1.106 |
|
483 |
root |
1.82 |
=item aio_mknod $path, $mode, $dev, $callback->($status) |
484 |
|
|
|
485 |
root |
1.86 |
[EXPERIMENTAL] |
486 |
|
|
|
487 |
root |
1.83 |
Asynchronously create a device node (or fifo). See mknod(2). |
488 |
|
|
|
489 |
root |
1.86 |
The only (POSIX-) portable way of calling this function is: |
490 |
root |
1.83 |
|
491 |
|
|
aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... |
492 |
root |
1.82 |
|
493 |
root |
1.106 |
|
494 |
root |
1.50 |
=item aio_link $srcpath, $dstpath, $callback->($status) |
495 |
|
|
|
496 |
|
|
Asynchronously create a new link to the existing object at C<$srcpath> at |
497 |
|
|
the path C<$dstpath> and call the callback with the result code. |
498 |
|
|
|
499 |
root |
1.106 |
|
500 |
root |
1.50 |
=item aio_symlink $srcpath, $dstpath, $callback->($status) |
501 |
|
|
|
502 |
|
|
Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
503 |
|
|
the path C<$dstpath> and call the callback with the result code. |
504 |
|
|
|
505 |
root |
1.106 |
|
506 |
root |
1.90 |
=item aio_readlink $path, $callback->($link) |
507 |
|
|
|
508 |
|
|
Asynchronously read the symlink specified by C<$path> and pass it to |
509 |
|
|
the callback. If an error occurs, nothing or undef gets passed to the |
510 |
|
|
callback. |
511 |
|
|
|
512 |
root |
1.106 |
|
513 |
root |
1.50 |
=item aio_rename $srcpath, $dstpath, $callback->($status) |
514 |
|
|
|
515 |
|
|
Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
516 |
|
|
rename(2) and call the callback with the result code. |
517 |
|
|
|
518 |
root |
1.106 |
|
519 |
root |
1.101 |
=item aio_mkdir $pathname, $mode, $callback->($status) |
520 |
|
|
|
521 |
|
|
Asynchronously mkdir (create) a directory and call the callback with |
522 |
|
|
the result code. C<$mode> will be modified by the umask at the time the |
523 |
|
|
request is executed, so do not change your umask. |
524 |
|
|
|
525 |
root |
1.106 |
|
526 |
root |
1.40 |
=item aio_rmdir $pathname, $callback->($status) |
527 |
root |
1.27 |
|
528 |
|
|
Asynchronously rmdir (delete) a directory and call the callback with the |
529 |
|
|
result code. |
530 |
|
|
|
531 |
root |
1.106 |
|
532 |
root |
1.46 |
=item aio_readdir $pathname, $callback->($entries) |
533 |
root |
1.37 |
|
534 |
|
|
Unlike the POSIX call of the same name, C<aio_readdir> reads an entire |
535 |
|
|
directory (i.e. opendir + readdir + closedir). The entries will not be |
536 |
|
|
sorted, and will B<NOT> include the C<.> and C<..> entries. |
537 |
|
|
|
538 |
root |
1.148 |
The callback is passed a single argument which is either C<undef> or an |
539 |
|
|
array-ref with the filenames. |
540 |
|
|
|
541 |
|
|
|
542 |
|
|
=item aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
543 |
|
|
|
544 |
|
|
Quite similar to C<aio_readdir>, but the C<$flags> argument allows to tune |
545 |
|
|
behaviour and output format. In case of an error, C<$entries> will be |
546 |
|
|
C<undef>. |
547 |
|
|
|
548 |
|
|
The flags are a combination of the following constants, ORed together (the |
549 |
|
|
flags will also be passed to the callback, possibly modified): |
550 |
|
|
|
551 |
|
|
=over 4 |
552 |
|
|
|
553 |
root |
1.150 |
=item IO::AIO::READDIR_DENTS |
554 |
root |
1.148 |
|
555 |
|
|
When this flag is off, then the callback gets an arrayref with of names |
556 |
|
|
only (as with C<aio_readdir>), otherwise it gets an arrayref with |
557 |
root |
1.150 |
C<[$name, $type, $inode]> arrayrefs, each describing a single directory |
558 |
root |
1.148 |
entry in more detail. |
559 |
|
|
|
560 |
|
|
C<$name> is the name of the entry. |
561 |
|
|
|
562 |
root |
1.150 |
C<$type> is one of the C<IO::AIO::DT_xxx> constants: |
563 |
root |
1.148 |
|
564 |
root |
1.150 |
C<IO::AIO::DT_UNKNOWN>, C<IO::AIO::DT_FIFO>, C<IO::AIO::DT_CHR>, C<IO::AIO::DT_DIR>, |
565 |
|
|
C<IO::AIO::DT_BLK>, C<IO::AIO::DT_REG>, C<IO::AIO::DT_LNK>, C<IO::AIO::DT_SOCK>, |
566 |
|
|
C<IO::AIO::DT_WHT>. |
567 |
root |
1.148 |
|
568 |
root |
1.150 |
C<IO::AIO::DT_UNKNOWN> means just that: readdir does not know. If you need to |
569 |
root |
1.148 |
know, you have to run stat yourself. Also, for speed reasons, the C<$type> |
570 |
|
|
scalars are read-only: you can not modify them. |
571 |
|
|
|
572 |
root |
1.150 |
C<$inode> is the inode number (which might not be exact on systems with 64 |
573 |
root |
1.155 |
bit inode numbers and 32 bit perls). This field has unspecified content on |
574 |
|
|
systems that do not deliver the inode information. |
575 |
root |
1.150 |
|
576 |
|
|
=item IO::AIO::READDIR_DIRS_FIRST |
577 |
root |
1.148 |
|
578 |
|
|
When this flag is set, then the names will be returned in an order where |
579 |
|
|
likely directories come first. This is useful when you need to quickly |
580 |
|
|
find directories, or you want to find all directories while avoiding to |
581 |
|
|
stat() each entry. |
582 |
|
|
|
583 |
root |
1.149 |
If the system returns type information in readdir, then this is used |
584 |
|
|
to find directories directly. Otherwise, likely directories are files |
585 |
|
|
beginning with ".", or otherwise files with no dots, of which files with |
586 |
|
|
short names are tried first. |
587 |
|
|
|
588 |
root |
1.150 |
=item IO::AIO::READDIR_STAT_ORDER |
589 |
root |
1.148 |
|
590 |
|
|
When this flag is set, then the names will be returned in an order |
591 |
|
|
suitable for stat()'ing each one. That is, when you plan to stat() |
592 |
|
|
all files in the given directory, then the returned order will likely |
593 |
|
|
be fastest. |
594 |
|
|
|
595 |
root |
1.150 |
If both this flag and C<IO::AIO::READDIR_DIRS_FIRST> are specified, then |
596 |
|
|
the likely dirs come first, resulting in a less optimal stat order. |
597 |
root |
1.148 |
|
598 |
root |
1.150 |
=item IO::AIO::READDIR_FOUND_UNKNOWN |
599 |
root |
1.148 |
|
600 |
|
|
This flag should not be set when calling C<aio_readdirx>. Instead, it |
601 |
|
|
is being set by C<aio_readdirx>, when any of the C<$type>'s found were |
602 |
root |
1.150 |
C<IO::AIO::DT_UNKNOWN>. The absense of this flag therefore indicates that all |
603 |
root |
1.148 |
C<$type>'s are known, which can be used to speed up some algorithms. |
604 |
|
|
|
605 |
|
|
=back |
606 |
root |
1.37 |
|
607 |
root |
1.106 |
|
608 |
root |
1.98 |
=item aio_load $path, $data, $callback->($status) |
609 |
|
|
|
610 |
|
|
This is a composite request that tries to fully load the given file into |
611 |
|
|
memory. Status is the same as with aio_read. |
612 |
|
|
|
613 |
|
|
=cut |
614 |
|
|
|
615 |
|
|
sub aio_load($$;$) { |
616 |
root |
1.123 |
my ($path, undef, $cb) = @_; |
617 |
|
|
my $data = \$_[1]; |
618 |
root |
1.98 |
|
619 |
root |
1.123 |
my $pri = aioreq_pri; |
620 |
|
|
my $grp = aio_group $cb; |
621 |
|
|
|
622 |
|
|
aioreq_pri $pri; |
623 |
|
|
add $grp aio_open $path, O_RDONLY, 0, sub { |
624 |
|
|
my $fh = shift |
625 |
|
|
or return $grp->result (-1); |
626 |
root |
1.98 |
|
627 |
|
|
aioreq_pri $pri; |
628 |
root |
1.123 |
add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub { |
629 |
|
|
$grp->result ($_[0]); |
630 |
root |
1.98 |
}; |
631 |
root |
1.123 |
}; |
632 |
root |
1.98 |
|
633 |
root |
1.123 |
$grp |
634 |
root |
1.98 |
} |
635 |
|
|
|
636 |
root |
1.82 |
=item aio_copy $srcpath, $dstpath, $callback->($status) |
637 |
|
|
|
638 |
|
|
Try to copy the I<file> (directories not supported as either source or |
639 |
|
|
destination) from C<$srcpath> to C<$dstpath> and call the callback with |
640 |
|
|
the C<0> (error) or C<-1> ok. |
641 |
|
|
|
642 |
root |
1.134 |
This is a composite request that creates the destination file with |
643 |
root |
1.82 |
mode 0200 and copies the contents of the source file into it using |
644 |
|
|
C<aio_sendfile>, followed by restoring atime, mtime, access mode and |
645 |
|
|
uid/gid, in that order. |
646 |
|
|
|
647 |
|
|
If an error occurs, the partial destination file will be unlinked, if |
648 |
|
|
possible, except when setting atime, mtime, access mode and uid/gid, where |
649 |
|
|
errors are being ignored. |
650 |
|
|
|
651 |
|
|
=cut |
652 |
|
|
|
653 |
|
|
sub aio_copy($$;$) { |
654 |
root |
1.123 |
my ($src, $dst, $cb) = @_; |
655 |
root |
1.82 |
|
656 |
root |
1.123 |
my $pri = aioreq_pri; |
657 |
|
|
my $grp = aio_group $cb; |
658 |
root |
1.82 |
|
659 |
root |
1.123 |
aioreq_pri $pri; |
660 |
|
|
add $grp aio_open $src, O_RDONLY, 0, sub { |
661 |
|
|
if (my $src_fh = $_[0]) { |
662 |
root |
1.147 |
my @stat = stat $src_fh; # hmm, might bock over nfs? |
663 |
root |
1.95 |
|
664 |
root |
1.123 |
aioreq_pri $pri; |
665 |
|
|
add $grp aio_open $dst, O_CREAT | O_WRONLY | O_TRUNC, 0200, sub { |
666 |
|
|
if (my $dst_fh = $_[0]) { |
667 |
|
|
aioreq_pri $pri; |
668 |
|
|
add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { |
669 |
|
|
if ($_[0] == $stat[7]) { |
670 |
|
|
$grp->result (0); |
671 |
|
|
close $src_fh; |
672 |
|
|
|
673 |
root |
1.147 |
my $ch = sub { |
674 |
|
|
aioreq_pri $pri; |
675 |
|
|
add $grp aio_chmod $dst_fh, $stat[2] & 07777, sub { |
676 |
|
|
aioreq_pri $pri; |
677 |
|
|
add $grp aio_chown $dst_fh, $stat[4], $stat[5], sub { |
678 |
|
|
aioreq_pri $pri; |
679 |
|
|
add $grp aio_close $dst_fh; |
680 |
|
|
} |
681 |
|
|
}; |
682 |
|
|
}; |
683 |
root |
1.123 |
|
684 |
|
|
aioreq_pri $pri; |
685 |
root |
1.147 |
add $grp aio_utime $dst_fh, $stat[8], $stat[9], sub { |
686 |
|
|
if ($_[0] < 0 && $! == ENOSYS) { |
687 |
|
|
aioreq_pri $pri; |
688 |
|
|
add $grp aio_utime $dst, $stat[8], $stat[9], $ch; |
689 |
|
|
} else { |
690 |
|
|
$ch->(); |
691 |
|
|
} |
692 |
|
|
}; |
693 |
root |
1.123 |
} else { |
694 |
|
|
$grp->result (-1); |
695 |
|
|
close $src_fh; |
696 |
|
|
close $dst_fh; |
697 |
|
|
|
698 |
|
|
aioreq $pri; |
699 |
|
|
add $grp aio_unlink $dst; |
700 |
|
|
} |
701 |
|
|
}; |
702 |
|
|
} else { |
703 |
|
|
$grp->result (-1); |
704 |
|
|
} |
705 |
|
|
}, |
706 |
root |
1.82 |
|
707 |
root |
1.123 |
} else { |
708 |
|
|
$grp->result (-1); |
709 |
|
|
} |
710 |
|
|
}; |
711 |
root |
1.82 |
|
712 |
root |
1.123 |
$grp |
713 |
root |
1.82 |
} |
714 |
|
|
|
715 |
|
|
=item aio_move $srcpath, $dstpath, $callback->($status) |
716 |
|
|
|
717 |
|
|
Try to move the I<file> (directories not supported as either source or |
718 |
|
|
destination) from C<$srcpath> to C<$dstpath> and call the callback with |
719 |
|
|
the C<0> (error) or C<-1> ok. |
720 |
|
|
|
721 |
root |
1.137 |
This is a composite request that tries to rename(2) the file first; if |
722 |
|
|
rename fails with C<EXDEV>, it copies the file with C<aio_copy> and, if |
723 |
|
|
that is successful, unlinks the C<$srcpath>. |
724 |
root |
1.82 |
|
725 |
|
|
=cut |
726 |
|
|
|
727 |
|
|
sub aio_move($$;$) { |
728 |
root |
1.123 |
my ($src, $dst, $cb) = @_; |
729 |
root |
1.82 |
|
730 |
root |
1.123 |
my $pri = aioreq_pri; |
731 |
|
|
my $grp = aio_group $cb; |
732 |
root |
1.82 |
|
733 |
root |
1.123 |
aioreq_pri $pri; |
734 |
|
|
add $grp aio_rename $src, $dst, sub { |
735 |
|
|
if ($_[0] && $! == EXDEV) { |
736 |
|
|
aioreq_pri $pri; |
737 |
|
|
add $grp aio_copy $src, $dst, sub { |
738 |
|
|
$grp->result ($_[0]); |
739 |
root |
1.95 |
|
740 |
root |
1.123 |
if (!$_[0]) { |
741 |
|
|
aioreq_pri $pri; |
742 |
|
|
add $grp aio_unlink $src; |
743 |
|
|
} |
744 |
|
|
}; |
745 |
|
|
} else { |
746 |
|
|
$grp->result ($_[0]); |
747 |
|
|
} |
748 |
|
|
}; |
749 |
root |
1.82 |
|
750 |
root |
1.123 |
$grp |
751 |
root |
1.82 |
} |
752 |
|
|
|
753 |
root |
1.40 |
=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
754 |
|
|
|
755 |
root |
1.52 |
Scans a directory (similar to C<aio_readdir>) but additionally tries to |
756 |
root |
1.76 |
efficiently separate the entries of directory C<$path> into two sets of |
757 |
|
|
names, directories you can recurse into (directories), and ones you cannot |
758 |
|
|
recurse into (everything else, including symlinks to directories). |
759 |
root |
1.52 |
|
760 |
root |
1.61 |
C<aio_scandir> is a composite request that creates of many sub requests_ |
761 |
|
|
C<$maxreq> specifies the maximum number of outstanding aio requests that |
762 |
|
|
this function generates. If it is C<< <= 0 >>, then a suitable default |
763 |
root |
1.81 |
will be chosen (currently 4). |
764 |
root |
1.40 |
|
765 |
|
|
On error, the callback is called without arguments, otherwise it receives |
766 |
|
|
two array-refs with path-relative entry names. |
767 |
|
|
|
768 |
|
|
Example: |
769 |
|
|
|
770 |
|
|
aio_scandir $dir, 0, sub { |
771 |
|
|
my ($dirs, $nondirs) = @_; |
772 |
|
|
print "real directories: @$dirs\n"; |
773 |
|
|
print "everything else: @$nondirs\n"; |
774 |
|
|
}; |
775 |
|
|
|
776 |
|
|
Implementation notes. |
777 |
|
|
|
778 |
|
|
The C<aio_readdir> cannot be avoided, but C<stat()>'ing every entry can. |
779 |
|
|
|
780 |
root |
1.149 |
If readdir returns file type information, then this is used directly to |
781 |
|
|
find directories. |
782 |
|
|
|
783 |
|
|
Otherwise, after reading the directory, the modification time, size etc. |
784 |
|
|
of the directory before and after the readdir is checked, and if they |
785 |
|
|
match (and isn't the current time), the link count will be used to decide |
786 |
|
|
how many entries are directories (if >= 2). Otherwise, no knowledge of the |
787 |
|
|
number of subdirectories will be assumed. |
788 |
|
|
|
789 |
|
|
Then entries will be sorted into likely directories a non-initial dot |
790 |
|
|
currently) and likely non-directories (see C<aio_readdirx>). Then every |
791 |
|
|
entry plus an appended C</.> will be C<stat>'ed, likely directories first, |
792 |
|
|
in order of their inode numbers. If that succeeds, it assumes that the |
793 |
|
|
entry is a directory or a symlink to directory (which will be checked |
794 |
root |
1.52 |
seperately). This is often faster than stat'ing the entry itself because |
795 |
|
|
filesystems might detect the type of the entry without reading the inode |
796 |
root |
1.149 |
data (e.g. ext2fs filetype feature), even on systems that cannot return |
797 |
|
|
the filetype information on readdir. |
798 |
root |
1.52 |
|
799 |
|
|
If the known number of directories (link count - 2) has been reached, the |
800 |
|
|
rest of the entries is assumed to be non-directories. |
801 |
|
|
|
802 |
|
|
This only works with certainty on POSIX (= UNIX) filesystems, which |
803 |
|
|
fortunately are the vast majority of filesystems around. |
804 |
|
|
|
805 |
|
|
It will also likely work on non-POSIX filesystems with reduced efficiency |
806 |
|
|
as those tend to return 0 or 1 as link counts, which disables the |
807 |
|
|
directory counting heuristic. |
808 |
root |
1.40 |
|
809 |
|
|
=cut |
810 |
|
|
|
811 |
root |
1.100 |
sub aio_scandir($$;$) { |
812 |
root |
1.123 |
my ($path, $maxreq, $cb) = @_; |
813 |
|
|
|
814 |
|
|
my $pri = aioreq_pri; |
815 |
root |
1.40 |
|
816 |
root |
1.123 |
my $grp = aio_group $cb; |
817 |
root |
1.80 |
|
818 |
root |
1.123 |
$maxreq = 4 if $maxreq <= 0; |
819 |
root |
1.55 |
|
820 |
root |
1.123 |
# stat once |
821 |
|
|
aioreq_pri $pri; |
822 |
|
|
add $grp aio_stat $path, sub { |
823 |
|
|
return $grp->result () if $_[0]; |
824 |
|
|
my $now = time; |
825 |
|
|
my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
826 |
root |
1.40 |
|
827 |
root |
1.123 |
# read the directory entries |
828 |
root |
1.80 |
aioreq_pri $pri; |
829 |
root |
1.148 |
add $grp aio_readdirx $path, READDIR_DIRS_FIRST, sub { |
830 |
root |
1.123 |
my $entries = shift |
831 |
|
|
or return $grp->result (); |
832 |
root |
1.40 |
|
833 |
root |
1.123 |
# stat the dir another time |
834 |
root |
1.80 |
aioreq_pri $pri; |
835 |
root |
1.123 |
add $grp aio_stat $path, sub { |
836 |
|
|
my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
837 |
root |
1.95 |
|
838 |
root |
1.123 |
my $ndirs; |
839 |
root |
1.95 |
|
840 |
root |
1.123 |
# take the slow route if anything looks fishy |
841 |
|
|
if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
842 |
|
|
$ndirs = -1; |
843 |
|
|
} else { |
844 |
|
|
# if nlink == 2, we are finished |
845 |
root |
1.150 |
# for non-posix-fs's, we rely on nlink < 2 |
846 |
root |
1.123 |
$ndirs = (stat _)[3] - 2 |
847 |
|
|
or return $grp->result ([], $entries); |
848 |
|
|
} |
849 |
|
|
|
850 |
|
|
my (@dirs, @nondirs); |
851 |
root |
1.40 |
|
852 |
root |
1.123 |
my $statgrp = add $grp aio_group sub { |
853 |
|
|
$grp->result (\@dirs, \@nondirs); |
854 |
|
|
}; |
855 |
root |
1.40 |
|
856 |
root |
1.123 |
limit $statgrp $maxreq; |
857 |
|
|
feed $statgrp sub { |
858 |
|
|
return unless @$entries; |
859 |
root |
1.150 |
my $entry = shift @$entries; |
860 |
root |
1.40 |
|
861 |
root |
1.123 |
aioreq_pri $pri; |
862 |
|
|
add $statgrp aio_stat "$path/$entry/.", sub { |
863 |
|
|
if ($_[0] < 0) { |
864 |
|
|
push @nondirs, $entry; |
865 |
|
|
} else { |
866 |
|
|
# need to check for real directory |
867 |
|
|
aioreq_pri $pri; |
868 |
|
|
add $statgrp aio_lstat "$path/$entry", sub { |
869 |
|
|
if (-d _) { |
870 |
|
|
push @dirs, $entry; |
871 |
|
|
|
872 |
|
|
unless (--$ndirs) { |
873 |
|
|
push @nondirs, @$entries; |
874 |
|
|
feed $statgrp; |
875 |
root |
1.74 |
} |
876 |
root |
1.123 |
} else { |
877 |
|
|
push @nondirs, $entry; |
878 |
root |
1.40 |
} |
879 |
|
|
} |
880 |
root |
1.123 |
} |
881 |
root |
1.74 |
}; |
882 |
root |
1.40 |
}; |
883 |
|
|
}; |
884 |
|
|
}; |
885 |
root |
1.123 |
}; |
886 |
root |
1.55 |
|
887 |
root |
1.123 |
$grp |
888 |
root |
1.40 |
} |
889 |
|
|
|
890 |
root |
1.99 |
=item aio_rmtree $path, $callback->($status) |
891 |
|
|
|
892 |
root |
1.100 |
Delete a directory tree starting (and including) C<$path>, return the |
893 |
|
|
status of the final C<rmdir> only. This is a composite request that |
894 |
|
|
uses C<aio_scandir> to recurse into and rmdir directories, and unlink |
895 |
|
|
everything else. |
896 |
root |
1.99 |
|
897 |
|
|
=cut |
898 |
|
|
|
899 |
|
|
sub aio_rmtree; |
900 |
root |
1.100 |
sub aio_rmtree($;$) { |
901 |
root |
1.123 |
my ($path, $cb) = @_; |
902 |
root |
1.99 |
|
903 |
root |
1.123 |
my $pri = aioreq_pri; |
904 |
|
|
my $grp = aio_group $cb; |
905 |
root |
1.99 |
|
906 |
root |
1.123 |
aioreq_pri $pri; |
907 |
|
|
add $grp aio_scandir $path, 0, sub { |
908 |
|
|
my ($dirs, $nondirs) = @_; |
909 |
root |
1.99 |
|
910 |
root |
1.123 |
my $dirgrp = aio_group sub { |
911 |
|
|
add $grp aio_rmdir $path, sub { |
912 |
|
|
$grp->result ($_[0]); |
913 |
root |
1.99 |
}; |
914 |
root |
1.123 |
}; |
915 |
root |
1.99 |
|
916 |
root |
1.123 |
(aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs; |
917 |
|
|
(aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs; |
918 |
root |
1.99 |
|
919 |
root |
1.123 |
add $grp $dirgrp; |
920 |
|
|
}; |
921 |
root |
1.99 |
|
922 |
root |
1.123 |
$grp |
923 |
root |
1.99 |
} |
924 |
|
|
|
925 |
root |
1.119 |
=item aio_sync $callback->($status) |
926 |
|
|
|
927 |
|
|
Asynchronously call sync and call the callback when finished. |
928 |
|
|
|
929 |
root |
1.40 |
=item aio_fsync $fh, $callback->($status) |
930 |
root |
1.1 |
|
931 |
|
|
Asynchronously call fsync on the given filehandle and call the callback |
932 |
|
|
with the fsync result code. |
933 |
|
|
|
934 |
root |
1.40 |
=item aio_fdatasync $fh, $callback->($status) |
935 |
root |
1.1 |
|
936 |
|
|
Asynchronously call fdatasync on the given filehandle and call the |
937 |
root |
1.26 |
callback with the fdatasync result code. |
938 |
|
|
|
939 |
|
|
If this call isn't available because your OS lacks it or it couldn't be |
940 |
|
|
detected, it will be emulated by calling C<fsync> instead. |
941 |
root |
1.1 |
|
942 |
root |
1.142 |
=item aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
943 |
|
|
|
944 |
|
|
Sync the data portion of the file specified by C<$offset> and C<$length> |
945 |
|
|
to disk (but NOT the metadata), by calling the Linux-specific |
946 |
|
|
sync_file_range call. If sync_file_range is not available or it returns |
947 |
|
|
ENOSYS, then fdatasync or fsync is being substituted. |
948 |
|
|
|
949 |
|
|
C<$flags> can be a combination of C<IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE>, |
950 |
|
|
C<IO::AIO::SYNC_FILE_RANGE_WRITE> and |
951 |
|
|
C<IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER>: refer to the sync_file_range |
952 |
|
|
manpage for details. |
953 |
|
|
|
954 |
root |
1.120 |
=item aio_pathsync $path, $callback->($status) |
955 |
|
|
|
956 |
|
|
This request tries to open, fsync and close the given path. This is a |
957 |
root |
1.135 |
composite request intended to sync directories after directory operations |
958 |
root |
1.120 |
(E.g. rename). This might not work on all operating systems or have any |
959 |
|
|
specific effect, but usually it makes sure that directory changes get |
960 |
|
|
written to disc. It works for anything that can be opened for read-only, |
961 |
|
|
not just directories. |
962 |
|
|
|
963 |
|
|
Passes C<0> when everything went ok, and C<-1> on error. |
964 |
|
|
|
965 |
|
|
=cut |
966 |
|
|
|
967 |
|
|
sub aio_pathsync($;$) { |
968 |
root |
1.123 |
my ($path, $cb) = @_; |
969 |
|
|
|
970 |
|
|
my $pri = aioreq_pri; |
971 |
|
|
my $grp = aio_group $cb; |
972 |
root |
1.120 |
|
973 |
root |
1.123 |
aioreq_pri $pri; |
974 |
|
|
add $grp aio_open $path, O_RDONLY, 0, sub { |
975 |
|
|
my ($fh) = @_; |
976 |
|
|
if ($fh) { |
977 |
|
|
aioreq_pri $pri; |
978 |
|
|
add $grp aio_fsync $fh, sub { |
979 |
|
|
$grp->result ($_[0]); |
980 |
root |
1.120 |
|
981 |
|
|
aioreq_pri $pri; |
982 |
root |
1.123 |
add $grp aio_close $fh; |
983 |
|
|
}; |
984 |
|
|
} else { |
985 |
|
|
$grp->result (-1); |
986 |
|
|
} |
987 |
|
|
}; |
988 |
root |
1.120 |
|
989 |
root |
1.123 |
$grp |
990 |
root |
1.120 |
} |
991 |
|
|
|
992 |
root |
1.58 |
=item aio_group $callback->(...) |
993 |
root |
1.54 |
|
994 |
root |
1.55 |
This is a very special aio request: Instead of doing something, it is a |
995 |
|
|
container for other aio requests, which is useful if you want to bundle |
996 |
root |
1.71 |
many requests into a single, composite, request with a definite callback |
997 |
|
|
and the ability to cancel the whole request with its subrequests. |
998 |
root |
1.55 |
|
999 |
|
|
Returns an object of class L<IO::AIO::GRP>. See its documentation below |
1000 |
|
|
for more info. |
1001 |
|
|
|
1002 |
|
|
Example: |
1003 |
|
|
|
1004 |
|
|
my $grp = aio_group sub { |
1005 |
|
|
print "all stats done\n"; |
1006 |
|
|
}; |
1007 |
|
|
|
1008 |
|
|
add $grp |
1009 |
|
|
(aio_stat ...), |
1010 |
|
|
(aio_stat ...), |
1011 |
|
|
...; |
1012 |
|
|
|
1013 |
root |
1.63 |
=item aio_nop $callback->() |
1014 |
|
|
|
1015 |
|
|
This is a special request - it does nothing in itself and is only used for |
1016 |
|
|
side effects, such as when you want to add a dummy request to a group so |
1017 |
|
|
that finishing the requests in the group depends on executing the given |
1018 |
|
|
code. |
1019 |
|
|
|
1020 |
root |
1.64 |
While this request does nothing, it still goes through the execution |
1021 |
|
|
phase and still requires a worker thread. Thus, the callback will not |
1022 |
|
|
be executed immediately but only after other requests in the queue have |
1023 |
|
|
entered their execution phase. This can be used to measure request |
1024 |
|
|
latency. |
1025 |
|
|
|
1026 |
root |
1.71 |
=item IO::AIO::aio_busy $fractional_seconds, $callback->() *NOT EXPORTED* |
1027 |
root |
1.54 |
|
1028 |
|
|
Mainly used for debugging and benchmarking, this aio request puts one of |
1029 |
|
|
the request workers to sleep for the given time. |
1030 |
|
|
|
1031 |
root |
1.56 |
While it is theoretically handy to have simple I/O scheduling requests |
1032 |
root |
1.71 |
like sleep and file handle readable/writable, the overhead this creates is |
1033 |
|
|
immense (it blocks a thread for a long time) so do not use this function |
1034 |
|
|
except to put your application under artificial I/O pressure. |
1035 |
root |
1.56 |
|
1036 |
root |
1.5 |
=back |
1037 |
|
|
|
1038 |
root |
1.53 |
=head2 IO::AIO::REQ CLASS |
1039 |
root |
1.52 |
|
1040 |
|
|
All non-aggregate C<aio_*> functions return an object of this class when |
1041 |
|
|
called in non-void context. |
1042 |
|
|
|
1043 |
|
|
=over 4 |
1044 |
|
|
|
1045 |
root |
1.65 |
=item cancel $req |
1046 |
root |
1.52 |
|
1047 |
|
|
Cancels the request, if possible. Has the effect of skipping execution |
1048 |
|
|
when entering the B<execute> state and skipping calling the callback when |
1049 |
|
|
entering the the B<result> state, but will leave the request otherwise |
1050 |
root |
1.151 |
untouched (with the exception of readdir). That means that requests that |
1051 |
|
|
currently execute will not be stopped and resources held by the request |
1052 |
|
|
will not be freed prematurely. |
1053 |
root |
1.52 |
|
1054 |
root |
1.65 |
=item cb $req $callback->(...) |
1055 |
|
|
|
1056 |
|
|
Replace (or simply set) the callback registered to the request. |
1057 |
|
|
|
1058 |
root |
1.52 |
=back |
1059 |
|
|
|
1060 |
root |
1.55 |
=head2 IO::AIO::GRP CLASS |
1061 |
|
|
|
1062 |
|
|
This class is a subclass of L<IO::AIO::REQ>, so all its methods apply to |
1063 |
|
|
objects of this class, too. |
1064 |
|
|
|
1065 |
|
|
A IO::AIO::GRP object is a special request that can contain multiple other |
1066 |
|
|
aio requests. |
1067 |
|
|
|
1068 |
|
|
You create one by calling the C<aio_group> constructing function with a |
1069 |
|
|
callback that will be called when all contained requests have entered the |
1070 |
|
|
C<done> state: |
1071 |
|
|
|
1072 |
|
|
my $grp = aio_group sub { |
1073 |
|
|
print "all requests are done\n"; |
1074 |
|
|
}; |
1075 |
|
|
|
1076 |
|
|
You add requests by calling the C<add> method with one or more |
1077 |
|
|
C<IO::AIO::REQ> objects: |
1078 |
|
|
|
1079 |
|
|
$grp->add (aio_unlink "..."); |
1080 |
|
|
|
1081 |
root |
1.58 |
add $grp aio_stat "...", sub { |
1082 |
|
|
$_[0] or return $grp->result ("error"); |
1083 |
|
|
|
1084 |
|
|
# add another request dynamically, if first succeeded |
1085 |
|
|
add $grp aio_open "...", sub { |
1086 |
|
|
$grp->result ("ok"); |
1087 |
|
|
}; |
1088 |
|
|
}; |
1089 |
root |
1.55 |
|
1090 |
|
|
This makes it very easy to create composite requests (see the source of |
1091 |
|
|
C<aio_move> for an application) that work and feel like simple requests. |
1092 |
|
|
|
1093 |
root |
1.62 |
=over 4 |
1094 |
|
|
|
1095 |
|
|
=item * The IO::AIO::GRP objects will be cleaned up during calls to |
1096 |
root |
1.55 |
C<IO::AIO::poll_cb>, just like any other request. |
1097 |
|
|
|
1098 |
root |
1.62 |
=item * They can be canceled like any other request. Canceling will cancel not |
1099 |
root |
1.59 |
only the request itself, but also all requests it contains. |
1100 |
root |
1.55 |
|
1101 |
root |
1.62 |
=item * They can also can also be added to other IO::AIO::GRP objects. |
1102 |
root |
1.55 |
|
1103 |
root |
1.62 |
=item * You must not add requests to a group from within the group callback (or |
1104 |
root |
1.60 |
any later time). |
1105 |
|
|
|
1106 |
root |
1.62 |
=back |
1107 |
|
|
|
1108 |
root |
1.55 |
Their lifetime, simplified, looks like this: when they are empty, they |
1109 |
|
|
will finish very quickly. If they contain only requests that are in the |
1110 |
|
|
C<done> state, they will also finish. Otherwise they will continue to |
1111 |
|
|
exist. |
1112 |
|
|
|
1113 |
root |
1.133 |
That means after creating a group you have some time to add requests |
1114 |
|
|
(precisely before the callback has been invoked, which is only done within |
1115 |
|
|
the C<poll_cb>). And in the callbacks of those requests, you can add |
1116 |
|
|
further requests to the group. And only when all those requests have |
1117 |
|
|
finished will the the group itself finish. |
1118 |
root |
1.57 |
|
1119 |
root |
1.55 |
=over 4 |
1120 |
|
|
|
1121 |
root |
1.65 |
=item add $grp ... |
1122 |
|
|
|
1123 |
root |
1.55 |
=item $grp->add (...) |
1124 |
|
|
|
1125 |
root |
1.57 |
Add one or more requests to the group. Any type of L<IO::AIO::REQ> can |
1126 |
|
|
be added, including other groups, as long as you do not create circular |
1127 |
|
|
dependencies. |
1128 |
|
|
|
1129 |
|
|
Returns all its arguments. |
1130 |
root |
1.55 |
|
1131 |
root |
1.74 |
=item $grp->cancel_subs |
1132 |
|
|
|
1133 |
|
|
Cancel all subrequests and clears any feeder, but not the group request |
1134 |
|
|
itself. Useful when you queued a lot of events but got a result early. |
1135 |
|
|
|
1136 |
root |
1.58 |
=item $grp->result (...) |
1137 |
|
|
|
1138 |
|
|
Set the result value(s) that will be passed to the group callback when all |
1139 |
root |
1.120 |
subrequests have finished and set the groups errno to the current value |
1140 |
root |
1.80 |
of errno (just like calling C<errno> without an error number). By default, |
1141 |
|
|
no argument will be passed and errno is zero. |
1142 |
|
|
|
1143 |
|
|
=item $grp->errno ([$errno]) |
1144 |
|
|
|
1145 |
|
|
Sets the group errno value to C<$errno>, or the current value of errno |
1146 |
|
|
when the argument is missing. |
1147 |
|
|
|
1148 |
|
|
Every aio request has an associated errno value that is restored when |
1149 |
|
|
the callback is invoked. This method lets you change this value from its |
1150 |
|
|
default (0). |
1151 |
|
|
|
1152 |
|
|
Calling C<result> will also set errno, so make sure you either set C<$!> |
1153 |
|
|
before the call to C<result>, or call c<errno> after it. |
1154 |
root |
1.58 |
|
1155 |
root |
1.65 |
=item feed $grp $callback->($grp) |
1156 |
root |
1.60 |
|
1157 |
|
|
Sets a feeder/generator on this group: every group can have an attached |
1158 |
|
|
generator that generates requests if idle. The idea behind this is that, |
1159 |
|
|
although you could just queue as many requests as you want in a group, |
1160 |
root |
1.139 |
this might starve other requests for a potentially long time. For example, |
1161 |
|
|
C<aio_scandir> might generate hundreds of thousands C<aio_stat> requests, |
1162 |
|
|
delaying any later requests for a long time. |
1163 |
root |
1.60 |
|
1164 |
|
|
To avoid this, and allow incremental generation of requests, you can |
1165 |
|
|
instead a group and set a feeder on it that generates those requests. The |
1166 |
root |
1.68 |
feed callback will be called whenever there are few enough (see C<limit>, |
1167 |
root |
1.60 |
below) requests active in the group itself and is expected to queue more |
1168 |
|
|
requests. |
1169 |
|
|
|
1170 |
root |
1.68 |
The feed callback can queue as many requests as it likes (i.e. C<add> does |
1171 |
|
|
not impose any limits). |
1172 |
root |
1.60 |
|
1173 |
root |
1.65 |
If the feed does not queue more requests when called, it will be |
1174 |
root |
1.60 |
automatically removed from the group. |
1175 |
|
|
|
1176 |
root |
1.138 |
If the feed limit is C<0> when this method is called, it will be set to |
1177 |
|
|
C<2> automatically. |
1178 |
root |
1.60 |
|
1179 |
|
|
Example: |
1180 |
|
|
|
1181 |
|
|
# stat all files in @files, but only ever use four aio requests concurrently: |
1182 |
|
|
|
1183 |
|
|
my $grp = aio_group sub { print "finished\n" }; |
1184 |
root |
1.68 |
limit $grp 4; |
1185 |
root |
1.65 |
feed $grp sub { |
1186 |
root |
1.60 |
my $file = pop @files |
1187 |
|
|
or return; |
1188 |
|
|
|
1189 |
|
|
add $grp aio_stat $file, sub { ... }; |
1190 |
root |
1.65 |
}; |
1191 |
root |
1.60 |
|
1192 |
root |
1.68 |
=item limit $grp $num |
1193 |
root |
1.60 |
|
1194 |
|
|
Sets the feeder limit for the group: The feeder will be called whenever |
1195 |
|
|
the group contains less than this many requests. |
1196 |
|
|
|
1197 |
|
|
Setting the limit to C<0> will pause the feeding process. |
1198 |
|
|
|
1199 |
root |
1.138 |
The default value for the limit is C<0>, but note that setting a feeder |
1200 |
|
|
automatically bumps it up to C<2>. |
1201 |
|
|
|
1202 |
root |
1.55 |
=back |
1203 |
|
|
|
1204 |
root |
1.5 |
=head2 SUPPORT FUNCTIONS |
1205 |
|
|
|
1206 |
root |
1.86 |
=head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION |
1207 |
|
|
|
1208 |
root |
1.5 |
=over 4 |
1209 |
|
|
|
1210 |
|
|
=item $fileno = IO::AIO::poll_fileno |
1211 |
|
|
|
1212 |
root |
1.20 |
Return the I<request result pipe file descriptor>. This filehandle must be |
1213 |
root |
1.156 |
polled for reading by some mechanism outside this module (e.g. EV, Glib, |
1214 |
|
|
select and so on, see below or the SYNOPSIS). If the pipe becomes readable |
1215 |
|
|
you have to call C<poll_cb> to check the results. |
1216 |
root |
1.5 |
|
1217 |
|
|
See C<poll_cb> for an example. |
1218 |
|
|
|
1219 |
|
|
=item IO::AIO::poll_cb |
1220 |
|
|
|
1221 |
root |
1.86 |
Process some outstanding events on the result pipe. You have to call this |
1222 |
root |
1.128 |
regularly. Returns C<0> if all events could be processed, or C<-1> if it |
1223 |
|
|
returned earlier for whatever reason. Returns immediately when no events |
1224 |
|
|
are outstanding. The amount of events processed depends on the settings of |
1225 |
|
|
C<IO::AIO::max_poll_req> and C<IO::AIO::max_poll_time>. |
1226 |
root |
1.5 |
|
1227 |
root |
1.78 |
If not all requests were processed for whatever reason, the filehandle |
1228 |
root |
1.128 |
will still be ready when C<poll_cb> returns, so normally you don't have to |
1229 |
|
|
do anything special to have it called later. |
1230 |
root |
1.78 |
|
1231 |
root |
1.20 |
Example: Install an Event watcher that automatically calls |
1232 |
root |
1.156 |
IO::AIO::poll_cb with high priority (more examples can be found in the |
1233 |
|
|
SYNOPSIS section, at the top of this document): |
1234 |
root |
1.5 |
|
1235 |
|
|
Event->io (fd => IO::AIO::poll_fileno, |
1236 |
|
|
poll => 'r', async => 1, |
1237 |
|
|
cb => \&IO::AIO::poll_cb); |
1238 |
|
|
|
1239 |
root |
1.86 |
=item IO::AIO::max_poll_reqs $nreqs |
1240 |
|
|
|
1241 |
|
|
=item IO::AIO::max_poll_time $seconds |
1242 |
|
|
|
1243 |
|
|
These set the maximum number of requests (default C<0>, meaning infinity) |
1244 |
|
|
that are being processed by C<IO::AIO::poll_cb> in one call, respectively |
1245 |
|
|
the maximum amount of time (default C<0>, meaning infinity) spent in |
1246 |
|
|
C<IO::AIO::poll_cb> to process requests (more correctly the mininum amount |
1247 |
|
|
of time C<poll_cb> is allowed to use). |
1248 |
root |
1.78 |
|
1249 |
root |
1.89 |
Setting C<max_poll_time> to a non-zero value creates an overhead of one |
1250 |
|
|
syscall per request processed, which is not normally a problem unless your |
1251 |
|
|
callbacks are really really fast or your OS is really really slow (I am |
1252 |
|
|
not mentioning Solaris here). Using C<max_poll_reqs> incurs no overhead. |
1253 |
|
|
|
1254 |
root |
1.86 |
Setting these is useful if you want to ensure some level of |
1255 |
|
|
interactiveness when perl is not fast enough to process all requests in |
1256 |
|
|
time. |
1257 |
root |
1.78 |
|
1258 |
root |
1.86 |
For interactive programs, values such as C<0.01> to C<0.1> should be fine. |
1259 |
root |
1.78 |
|
1260 |
|
|
Example: Install an Event watcher that automatically calls |
1261 |
root |
1.89 |
IO::AIO::poll_cb with low priority, to ensure that other parts of the |
1262 |
root |
1.78 |
program get the CPU sometimes even under high AIO load. |
1263 |
|
|
|
1264 |
root |
1.86 |
# try not to spend much more than 0.1s in poll_cb |
1265 |
|
|
IO::AIO::max_poll_time 0.1; |
1266 |
|
|
|
1267 |
|
|
# use a low priority so other tasks have priority |
1268 |
root |
1.78 |
Event->io (fd => IO::AIO::poll_fileno, |
1269 |
|
|
poll => 'r', nice => 1, |
1270 |
root |
1.86 |
cb => &IO::AIO::poll_cb); |
1271 |
root |
1.78 |
|
1272 |
root |
1.5 |
=item IO::AIO::poll_wait |
1273 |
|
|
|
1274 |
root |
1.93 |
If there are any outstanding requests and none of them in the result |
1275 |
|
|
phase, wait till the result filehandle becomes ready for reading (simply |
1276 |
|
|
does a C<select> on the filehandle. This is useful if you want to |
1277 |
|
|
synchronously wait for some requests to finish). |
1278 |
root |
1.5 |
|
1279 |
|
|
See C<nreqs> for an example. |
1280 |
|
|
|
1281 |
root |
1.86 |
=item IO::AIO::poll |
1282 |
root |
1.5 |
|
1283 |
root |
1.86 |
Waits until some requests have been handled. |
1284 |
root |
1.5 |
|
1285 |
root |
1.92 |
Returns the number of requests processed, but is otherwise strictly |
1286 |
|
|
equivalent to: |
1287 |
root |
1.5 |
|
1288 |
|
|
IO::AIO::poll_wait, IO::AIO::poll_cb |
1289 |
root |
1.80 |
|
1290 |
root |
1.12 |
=item IO::AIO::flush |
1291 |
|
|
|
1292 |
|
|
Wait till all outstanding AIO requests have been handled. |
1293 |
|
|
|
1294 |
root |
1.13 |
Strictly equivalent to: |
1295 |
|
|
|
1296 |
|
|
IO::AIO::poll_wait, IO::AIO::poll_cb |
1297 |
|
|
while IO::AIO::nreqs; |
1298 |
|
|
|
1299 |
root |
1.104 |
=back |
1300 |
|
|
|
1301 |
root |
1.86 |
=head3 CONTROLLING THE NUMBER OF THREADS |
1302 |
root |
1.13 |
|
1303 |
root |
1.105 |
=over |
1304 |
|
|
|
1305 |
root |
1.5 |
=item IO::AIO::min_parallel $nthreads |
1306 |
|
|
|
1307 |
root |
1.61 |
Set the minimum number of AIO threads to C<$nthreads>. The current |
1308 |
|
|
default is C<8>, which means eight asynchronous operations can execute |
1309 |
|
|
concurrently at any one time (the number of outstanding requests, |
1310 |
|
|
however, is unlimited). |
1311 |
root |
1.5 |
|
1312 |
root |
1.34 |
IO::AIO starts threads only on demand, when an AIO request is queued and |
1313 |
root |
1.86 |
no free thread exists. Please note that queueing up a hundred requests can |
1314 |
|
|
create demand for a hundred threads, even if it turns out that everything |
1315 |
|
|
is in the cache and could have been processed faster by a single thread. |
1316 |
root |
1.34 |
|
1317 |
root |
1.61 |
It is recommended to keep the number of threads relatively low, as some |
1318 |
|
|
Linux kernel versions will scale negatively with the number of threads |
1319 |
|
|
(higher parallelity => MUCH higher latency). With current Linux 2.6 |
1320 |
|
|
versions, 4-32 threads should be fine. |
1321 |
root |
1.5 |
|
1322 |
root |
1.34 |
Under most circumstances you don't need to call this function, as the |
1323 |
|
|
module selects a default that is suitable for low to moderate load. |
1324 |
root |
1.5 |
|
1325 |
|
|
=item IO::AIO::max_parallel $nthreads |
1326 |
|
|
|
1327 |
root |
1.34 |
Sets the maximum number of AIO threads to C<$nthreads>. If more than the |
1328 |
|
|
specified number of threads are currently running, this function kills |
1329 |
|
|
them. This function blocks until the limit is reached. |
1330 |
|
|
|
1331 |
|
|
While C<$nthreads> are zero, aio requests get queued but not executed |
1332 |
|
|
until the number of threads has been increased again. |
1333 |
root |
1.5 |
|
1334 |
|
|
This module automatically runs C<max_parallel 0> at program end, to ensure |
1335 |
|
|
that all threads are killed and that there are no outstanding requests. |
1336 |
|
|
|
1337 |
|
|
Under normal circumstances you don't need to call this function. |
1338 |
|
|
|
1339 |
root |
1.86 |
=item IO::AIO::max_idle $nthreads |
1340 |
|
|
|
1341 |
|
|
Limit the number of threads (default: 4) that are allowed to idle (i.e., |
1342 |
|
|
threads that did not get a request to process within 10 seconds). That |
1343 |
|
|
means if a thread becomes idle while C<$nthreads> other threads are also |
1344 |
|
|
idle, it will free its resources and exit. |
1345 |
|
|
|
1346 |
|
|
This is useful when you allow a large number of threads (e.g. 100 or 1000) |
1347 |
|
|
to allow for extremely high load situations, but want to free resources |
1348 |
|
|
under normal circumstances (1000 threads can easily consume 30MB of RAM). |
1349 |
|
|
|
1350 |
|
|
The default is probably ok in most situations, especially if thread |
1351 |
|
|
creation is fast. If thread creation is very slow on your system you might |
1352 |
|
|
want to use larger values. |
1353 |
|
|
|
1354 |
root |
1.123 |
=item IO::AIO::max_outstanding $maxreqs |
1355 |
root |
1.5 |
|
1356 |
root |
1.79 |
This is a very bad function to use in interactive programs because it |
1357 |
|
|
blocks, and a bad way to reduce concurrency because it is inexact: Better |
1358 |
|
|
use an C<aio_group> together with a feed callback. |
1359 |
|
|
|
1360 |
|
|
Sets the maximum number of outstanding requests to C<$nreqs>. If you |
1361 |
root |
1.113 |
do queue up more than this number of requests, the next call to the |
1362 |
root |
1.79 |
C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>) |
1363 |
|
|
function will block until the limit is no longer exceeded. |
1364 |
|
|
|
1365 |
|
|
The default value is very large, so there is no practical limit on the |
1366 |
|
|
number of outstanding requests. |
1367 |
|
|
|
1368 |
|
|
You can still queue as many requests as you want. Therefore, |
1369 |
root |
1.123 |
C<max_outstanding> is mainly useful in simple scripts (with low values) or |
1370 |
root |
1.79 |
as a stop gap to shield against fatal memory overflow (with large values). |
1371 |
root |
1.5 |
|
1372 |
root |
1.104 |
=back |
1373 |
|
|
|
1374 |
root |
1.86 |
=head3 STATISTICAL INFORMATION |
1375 |
|
|
|
1376 |
root |
1.104 |
=over |
1377 |
|
|
|
1378 |
root |
1.86 |
=item IO::AIO::nreqs |
1379 |
|
|
|
1380 |
|
|
Returns the number of requests currently in the ready, execute or pending |
1381 |
|
|
states (i.e. for which their callback has not been invoked yet). |
1382 |
|
|
|
1383 |
|
|
Example: wait till there are no outstanding requests anymore: |
1384 |
|
|
|
1385 |
|
|
IO::AIO::poll_wait, IO::AIO::poll_cb |
1386 |
|
|
while IO::AIO::nreqs; |
1387 |
|
|
|
1388 |
|
|
=item IO::AIO::nready |
1389 |
|
|
|
1390 |
|
|
Returns the number of requests currently in the ready state (not yet |
1391 |
|
|
executed). |
1392 |
|
|
|
1393 |
|
|
=item IO::AIO::npending |
1394 |
|
|
|
1395 |
|
|
Returns the number of requests currently in the pending state (executed, |
1396 |
|
|
but not yet processed by poll_cb). |
1397 |
|
|
|
1398 |
root |
1.5 |
=back |
1399 |
|
|
|
1400 |
root |
1.157 |
=head3 MISCELLANEOUS FUNCTIONS |
1401 |
|
|
|
1402 |
|
|
IO::AIO implements some functions that might be useful, but are not |
1403 |
|
|
asynchronous. |
1404 |
|
|
|
1405 |
|
|
=over 4 |
1406 |
|
|
|
1407 |
|
|
=item IO::AIO::sendfile $ofh, $ifh, $offset, $count |
1408 |
|
|
|
1409 |
|
|
Calls the C<eio_sendfile_sync> function, which is like C<aio_sendfile>, |
1410 |
|
|
but is blocking (this makes most sense if you know the input data is |
1411 |
|
|
likely cached already and the output filehandle is set to non-blocking |
1412 |
|
|
operations). |
1413 |
|
|
|
1414 |
|
|
Returns the number of bytes copied, or C<-1> on error. |
1415 |
|
|
|
1416 |
|
|
=item IO::AIO::fadvise $fh, $offset, $len, $advice |
1417 |
|
|
|
1418 |
|
|
Simply calls the C<posix_fadvise> function (see it's |
1419 |
|
|
manpage for details). The following advice constants are |
1420 |
|
|
avaiable: C<IO::AIO::FADV_NORMAL>, C<IO::AIO::FADV_SEQUENTIAL>, |
1421 |
|
|
C<IO::AIO::FADV_RANDOM>, C<IO::AIO::FADV_NOREUSE>, |
1422 |
|
|
C<IO::AIO::FADV_WILLNEED>, C<IO::AIO::FADV_DONTNEED>. |
1423 |
|
|
|
1424 |
|
|
On systems that do not implement C<posix_fadvise>, this function returns |
1425 |
|
|
ENOSYS, otherwise the return value of C<posix_fadvise>. |
1426 |
|
|
|
1427 |
|
|
=back |
1428 |
|
|
|
1429 |
root |
1.1 |
=cut |
1430 |
|
|
|
1431 |
root |
1.61 |
min_parallel 8; |
1432 |
root |
1.1 |
|
1433 |
root |
1.95 |
END { flush } |
1434 |
root |
1.82 |
|
1435 |
root |
1.1 |
1; |
1436 |
|
|
|
1437 |
root |
1.27 |
=head2 FORK BEHAVIOUR |
1438 |
|
|
|
1439 |
root |
1.52 |
This module should do "the right thing" when the process using it forks: |
1440 |
|
|
|
1441 |
root |
1.34 |
Before the fork, IO::AIO enters a quiescent state where no requests |
1442 |
|
|
can be added in other threads and no results will be processed. After |
1443 |
|
|
the fork the parent simply leaves the quiescent state and continues |
1444 |
root |
1.72 |
request/result processing, while the child frees the request/result queue |
1445 |
|
|
(so that the requests started before the fork will only be handled in the |
1446 |
|
|
parent). Threads will be started on demand until the limit set in the |
1447 |
root |
1.34 |
parent process has been reached again. |
1448 |
root |
1.27 |
|
1449 |
root |
1.52 |
In short: the parent will, after a short pause, continue as if fork had |
1450 |
|
|
not been called, while the child will act as if IO::AIO has not been used |
1451 |
|
|
yet. |
1452 |
|
|
|
1453 |
root |
1.60 |
=head2 MEMORY USAGE |
1454 |
|
|
|
1455 |
root |
1.72 |
Per-request usage: |
1456 |
|
|
|
1457 |
|
|
Each aio request uses - depending on your architecture - around 100-200 |
1458 |
|
|
bytes of memory. In addition, stat requests need a stat buffer (possibly |
1459 |
|
|
a few hundred bytes), readdir requires a result buffer and so on. Perl |
1460 |
|
|
scalars and other data passed into aio requests will also be locked and |
1461 |
|
|
will consume memory till the request has entered the done state. |
1462 |
root |
1.60 |
|
1463 |
root |
1.111 |
This is not awfully much, so queuing lots of requests is not usually a |
1464 |
root |
1.60 |
problem. |
1465 |
|
|
|
1466 |
root |
1.72 |
Per-thread usage: |
1467 |
|
|
|
1468 |
|
|
In the execution phase, some aio requests require more memory for |
1469 |
|
|
temporary buffers, and each thread requires a stack and other data |
1470 |
|
|
structures (usually around 16k-128k, depending on the OS). |
1471 |
|
|
|
1472 |
|
|
=head1 KNOWN BUGS |
1473 |
|
|
|
1474 |
root |
1.73 |
Known bugs will be fixed in the next release. |
1475 |
root |
1.60 |
|
1476 |
root |
1.1 |
=head1 SEE ALSO |
1477 |
|
|
|
1478 |
root |
1.125 |
L<AnyEvent::AIO> for easy integration into event loops, L<Coro::AIO> for a |
1479 |
|
|
more natural syntax. |
1480 |
root |
1.1 |
|
1481 |
|
|
=head1 AUTHOR |
1482 |
|
|
|
1483 |
|
|
Marc Lehmann <schmorp@schmorp.de> |
1484 |
|
|
http://home.schmorp.de/ |
1485 |
|
|
|
1486 |
|
|
=cut |
1487 |
|
|
|