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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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1.6 |
aio_open "/etc/passwd", O_RDONLY, 0, sub { |
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my ($fh) = @_; |
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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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1.8 |
$_[0] > 0 or die "read error: $!"; |
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1.6 |
}; |
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1.56 |
# version 2+ has request and group objects |
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use IO::AIO 2; |
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1.52 |
|
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1.68 |
aioreq_pri 4; # give next request a very high priority |
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1.52 |
my $req = aio_unlink "/tmp/file", sub { }; |
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$req->cancel; # cancel request if still in queue |
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1.56 |
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 |
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open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!"; |
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my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb }); |
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1.56 |
# Event integration |
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1.6 |
Event->io (fd => IO::AIO::poll_fileno, |
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1.7 |
poll => 'r', |
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1.6 |
cb => \&IO::AIO::poll_cb); |
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1.56 |
# Glib/Gtk2 integration |
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1.6 |
add_watch Glib::IO IO::AIO::poll_fileno, |
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1.22 |
in => sub { IO::AIO::poll_cb; 1 }; |
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1.6 |
|
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1.56 |
# Tk integration |
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1.6 |
Tk::Event::IO->fileevent (IO::AIO::poll_fileno, "", |
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readable => \&IO::AIO::poll_cb); |
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1.56 |
# Danga::Socket integration |
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1.11 |
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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1.2 |
operating system supports. |
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1.1 |
|
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1.2 |
Currently, a number of threads are started that execute your read/writes |
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1.66 |
and signal their completion. You don't need thread support in perl, and |
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the threads created by this module will not be visible to perl. In the |
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future, this module might make use of the native aio functions available |
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on many operating systems. However, they are often not well-supported |
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(Linux doesn't allow them on normal files currently, for example), |
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and they would only support aio_read and aio_write, so the remaining |
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functionality would have to be implemented using threads anyway. |
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1.1 |
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1.68 |
Although the module will work with in the presence of other 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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1.1 |
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=cut |
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package IO::AIO; |
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1.23 |
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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1.55 |
our $VERSION = '2.0'; |
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1.1 |
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1.67 |
our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
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aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
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aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move |
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aio_group aio_nop); |
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our @EXPORT = (@AIO_REQ, qw(aioreq_pri)); |
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our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
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min_parallel max_parallel max_outstanding nreqs); |
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1.1 |
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1.54 |
@IO::AIO::GRP::ISA = 'IO::AIO::REQ'; |
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1.1 |
require XSLoader; |
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XSLoader::load ("IO::AIO", $VERSION); |
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1.1 |
} |
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1.5 |
=head1 FUNCTIONS |
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1.1 |
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1.5 |
=head2 AIO FUNCTIONS |
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1.1 |
|
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1.5 |
All the C<aio_*> calls are more or less thin wrappers around the syscall |
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with the same name (sans C<aio_>). The arguments are similar or identical, |
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1.14 |
and they all accept an additional (and optional) C<$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 it's sole argument when the given |
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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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1.55 |
All requests return objects of type L<IO::AIO::REQ> that allow further |
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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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encoded in byte form. The reason for the former is that at the time the |
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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. |
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To encode pathnames to byte form, either make sure you either: a) |
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always pass in filenames you got from outside (command line, readdir |
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etc.), 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. |
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1.1 |
|
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1.5 |
=over 4 |
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1.1 |
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1.68 |
=item aioreq_pri $pri |
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Sets the priority for the next aio request. The default priority |
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is C<0>, the minimum and maximum priorities are C<-4> and C<4>, |
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respectively. Requests with higher priority will be serviced 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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functions. |
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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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and C<0666> or C<0777> if you do). |
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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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1.40 |
=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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code. I<WARNING:> although accepted, you should not pass in a perl |
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1.20 |
filehandle here, as perl will likely close the file descriptor another |
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time when the filehandle is destroyed. Normally, you can safely call perls |
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C<close> or just let filehandles go out of scope. |
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This is supposed to be a bug in the API, so that might change. It's |
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therefore best to avoid this function. |
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1.1 |
|
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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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Reads or writes C<length> bytes from the specified C<fh> and C<offset> |
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into the scalar given by C<data> and offset C<dataoffset> and calls the |
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callback without the actual number of bytes read (or -1 on error, just |
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like the syscall). |
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1.31 |
The C<$data> scalar I<MUST NOT> be modified in any way while the request |
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is outstanding. Modifying it can result in segfaults or WW3 (if the |
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necessary/optional hardware is installed). |
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1.17 |
Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at |
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1.1 |
offset C<0> within the scalar: |
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aio_read $fh, 7, 15, $buffer, 0, sub { |
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1.9 |
$_[0] > 0 or die "read error: $!"; |
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print "read $_[0] bytes: <$buffer>\n"; |
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1.1 |
}; |
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1.50 |
=item aio_move $srcpath, $dstpath, $callback->($status) |
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1.58 |
[EXPERIMENTAL due to internal aio_group use] |
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1.52 |
Try to move the I<file> (directories not supported as either source or |
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destination) from C<$srcpath> to C<$dstpath> and call the callback with |
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the C<0> (error) or C<-1> ok. |
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1.50 |
|
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This is a composite request that tries to rename(2) the file first. If |
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rename files with C<EXDEV>, it creates the destination file with mode 0200 |
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and copies the contents of the source file into it using C<aio_sendfile>, |
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followed by restoring atime, mtime, access mode and uid/gid, in that |
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order, and unlinking the C<$srcpath>. |
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If an error occurs, the partial destination file will be unlinked, if |
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possible, except when setting atime, mtime, access mode and uid/gid, where |
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errors are being ignored. |
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=cut |
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sub aio_move($$$) { |
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my ($src, $dst, $cb) = @_; |
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1.58 |
my $grp = aio_group $cb; |
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1.55 |
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add $grp aio_rename $src, $dst, sub { |
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1.51 |
if ($_[0] && $! == EXDEV) { |
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1.55 |
add $grp aio_open $src, O_RDONLY, 0, sub { |
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1.50 |
if (my $src_fh = $_[0]) { |
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my @stat = stat $src_fh; |
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1.55 |
add $grp aio_open $dst, O_WRONLY, 0200, sub { |
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1.50 |
if (my $dst_fh = $_[0]) { |
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1.55 |
add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { |
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1.50 |
close $src_fh; |
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if ($_[0] == $stat[7]) { |
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utime $stat[8], $stat[9], $dst; |
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chmod $stat[2] & 07777, $dst_fh; |
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chown $stat[4], $stat[5], $dst_fh; |
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close $dst_fh; |
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1.55 |
add $grp aio_unlink $src, sub { |
240 |
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1.58 |
$grp->result ($_[0]); |
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1.50 |
}; |
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} else { |
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my $errno = $!; |
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1.55 |
add $grp aio_unlink $dst, sub { |
245 |
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1.50 |
$! = $errno; |
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1.58 |
$grp->result (-1); |
247 |
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1.50 |
}; |
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} |
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}; |
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} else { |
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1.58 |
$grp->result (-1); |
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1.50 |
} |
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}, |
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} else { |
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1.58 |
$grp->result (-1); |
257 |
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1.50 |
} |
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}; |
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} else { |
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1.58 |
$grp->result ($_[0]); |
261 |
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1.50 |
} |
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}; |
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1.55 |
|
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$grp |
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1.50 |
} |
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1.40 |
=item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
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1.35 |
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Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts |
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reading at byte offset C<$in_offset>, and starts writing at the current |
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file offset of C<$out_fh>. Because of that, it is not safe to issue more |
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than one C<aio_sendfile> per C<$out_fh>, as they will interfere with each |
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other. |
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This call tries to make use of a native C<sendfile> syscall to provide |
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zero-copy operation. For this to work, C<$out_fh> should refer to a |
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socket, and C<$in_fh> should refer to mmap'able file. |
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If the native sendfile call fails or is not implemented, it will be |
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1.36 |
emulated, so you can call C<aio_sendfile> on any type of filehandle |
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regardless of the limitations of the operating system. |
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1.35 |
|
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Please note, however, that C<aio_sendfile> can read more bytes from |
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C<$in_fh> than are written, and there is no way to find out how many |
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1.36 |
bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only |
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provides the number of bytes written to C<$out_fh>. Only if the result |
287 |
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value equals C<$length> one can assume that C<$length> bytes have been |
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read. |
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1.35 |
|
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1.40 |
=item aio_readahead $fh,$offset,$length, $callback->($retval) |
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1.1 |
|
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1.20 |
C<aio_readahead> populates the page cache with data from a file so that |
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1.1 |
subsequent reads from that file will not block on disk I/O. The C<$offset> |
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argument specifies the starting point from which data is to be read and |
295 |
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C<$length> specifies the number of bytes to be read. I/O is performed in |
296 |
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whole pages, so that offset is effectively rounded down to a page boundary |
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and bytes are read up to the next page boundary greater than or equal to |
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1.20 |
(off-set+length). C<aio_readahead> does not read beyond the end of the |
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1.1 |
file. The current file offset of the file is left unchanged. |
300 |
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|
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1.26 |
If that syscall doesn't exist (likely if your OS isn't Linux) it will be |
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emulated by simply reading the data, which would have a similar effect. |
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|
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1.40 |
=item aio_stat $fh_or_path, $callback->($status) |
305 |
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1.1 |
|
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1.40 |
=item aio_lstat $fh, $callback->($status) |
307 |
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1.1 |
|
308 |
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Works like perl's C<stat> or C<lstat> in void context. The callback will |
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be called after the stat and the results will be available using C<stat _> |
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or C<-s _> etc... |
311 |
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The pathname passed to C<aio_stat> must be absolute. See API NOTES, above, |
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for an explanation. |
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Currently, the stats are always 64-bit-stats, i.e. instead of returning an |
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error when stat'ing a large file, the results will be silently truncated |
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unless perl itself is compiled with large file support. |
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Example: Print the length of F</etc/passwd>: |
320 |
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321 |
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aio_stat "/etc/passwd", sub { |
322 |
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$_[0] and die "stat failed: $!"; |
323 |
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print "size is ", -s _, "\n"; |
324 |
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}; |
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1.40 |
=item aio_unlink $pathname, $callback->($status) |
327 |
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1.1 |
|
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Asynchronously unlink (delete) a file and call the callback with the |
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result code. |
330 |
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1.50 |
=item aio_link $srcpath, $dstpath, $callback->($status) |
332 |
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333 |
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Asynchronously create a new link to the existing object at C<$srcpath> at |
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the path C<$dstpath> and call the callback with the result code. |
335 |
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336 |
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=item aio_symlink $srcpath, $dstpath, $callback->($status) |
337 |
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338 |
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Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
339 |
|
|
the path C<$dstpath> and call the callback with the result code. |
340 |
|
|
|
341 |
|
|
=item aio_rename $srcpath, $dstpath, $callback->($status) |
342 |
|
|
|
343 |
|
|
Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
344 |
|
|
rename(2) and call the callback with the result code. |
345 |
|
|
|
346 |
root |
1.40 |
=item aio_rmdir $pathname, $callback->($status) |
347 |
root |
1.27 |
|
348 |
|
|
Asynchronously rmdir (delete) a directory and call the callback with the |
349 |
|
|
result code. |
350 |
|
|
|
351 |
root |
1.46 |
=item aio_readdir $pathname, $callback->($entries) |
352 |
root |
1.37 |
|
353 |
|
|
Unlike the POSIX call of the same name, C<aio_readdir> reads an entire |
354 |
|
|
directory (i.e. opendir + readdir + closedir). The entries will not be |
355 |
|
|
sorted, and will B<NOT> include the C<.> and C<..> entries. |
356 |
|
|
|
357 |
|
|
The callback a single argument which is either C<undef> or an array-ref |
358 |
|
|
with the filenames. |
359 |
|
|
|
360 |
root |
1.40 |
=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
361 |
|
|
|
362 |
root |
1.58 |
[EXPERIMENTAL due to internal aio_group use] |
363 |
|
|
|
364 |
root |
1.52 |
Scans a directory (similar to C<aio_readdir>) but additionally tries to |
365 |
|
|
separate the entries of directory C<$path> into two sets of names, ones |
366 |
|
|
you can recurse into (directories or links to them), and ones you cannot |
367 |
|
|
recurse into (everything else). |
368 |
|
|
|
369 |
root |
1.61 |
C<aio_scandir> is a composite request that creates of many sub requests_ |
370 |
|
|
C<$maxreq> specifies the maximum number of outstanding aio requests that |
371 |
|
|
this function generates. If it is C<< <= 0 >>, then a suitable default |
372 |
|
|
will be chosen (currently 6). |
373 |
root |
1.40 |
|
374 |
|
|
On error, the callback is called without arguments, otherwise it receives |
375 |
|
|
two array-refs with path-relative entry names. |
376 |
|
|
|
377 |
|
|
Example: |
378 |
|
|
|
379 |
|
|
aio_scandir $dir, 0, sub { |
380 |
|
|
my ($dirs, $nondirs) = @_; |
381 |
|
|
print "real directories: @$dirs\n"; |
382 |
|
|
print "everything else: @$nondirs\n"; |
383 |
|
|
}; |
384 |
|
|
|
385 |
|
|
Implementation notes. |
386 |
|
|
|
387 |
|
|
The C<aio_readdir> cannot be avoided, but C<stat()>'ing every entry can. |
388 |
|
|
|
389 |
|
|
After reading the directory, the modification time, size etc. of the |
390 |
root |
1.52 |
directory before and after the readdir is checked, and if they match (and |
391 |
|
|
isn't the current time), the link count will be used to decide how many |
392 |
|
|
entries are directories (if >= 2). Otherwise, no knowledge of the number |
393 |
|
|
of subdirectories will be assumed. |
394 |
|
|
|
395 |
|
|
Then entries will be sorted into likely directories (everything without |
396 |
|
|
a non-initial dot currently) and likely non-directories (everything |
397 |
|
|
else). Then every entry plus an appended C</.> will be C<stat>'ed, |
398 |
|
|
likely directories first. If that succeeds, it assumes that the entry |
399 |
|
|
is a directory or a symlink to directory (which will be checked |
400 |
|
|
seperately). This is often faster than stat'ing the entry itself because |
401 |
|
|
filesystems might detect the type of the entry without reading the inode |
402 |
|
|
data (e.g. ext2fs filetype feature). |
403 |
|
|
|
404 |
|
|
If the known number of directories (link count - 2) has been reached, the |
405 |
|
|
rest of the entries is assumed to be non-directories. |
406 |
|
|
|
407 |
|
|
This only works with certainty on POSIX (= UNIX) filesystems, which |
408 |
|
|
fortunately are the vast majority of filesystems around. |
409 |
|
|
|
410 |
|
|
It will also likely work on non-POSIX filesystems with reduced efficiency |
411 |
|
|
as those tend to return 0 or 1 as link counts, which disables the |
412 |
|
|
directory counting heuristic. |
413 |
root |
1.40 |
|
414 |
|
|
=cut |
415 |
|
|
|
416 |
|
|
sub aio_scandir($$$) { |
417 |
|
|
my ($path, $maxreq, $cb) = @_; |
418 |
|
|
|
419 |
root |
1.58 |
my $grp = aio_group $cb; |
420 |
root |
1.55 |
|
421 |
root |
1.61 |
$maxreq = 6 if $maxreq <= 0; |
422 |
root |
1.40 |
|
423 |
|
|
# stat once |
424 |
root |
1.55 |
add $grp aio_stat $path, sub { |
425 |
root |
1.58 |
return $grp->result () if $_[0]; |
426 |
root |
1.52 |
my $now = time; |
427 |
root |
1.40 |
my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
428 |
|
|
|
429 |
|
|
# read the directory entries |
430 |
root |
1.55 |
add $grp aio_readdir $path, sub { |
431 |
root |
1.40 |
my $entries = shift |
432 |
root |
1.58 |
or return $grp->result (); |
433 |
root |
1.40 |
|
434 |
|
|
# stat the dir another time |
435 |
root |
1.55 |
add $grp aio_stat $path, sub { |
436 |
root |
1.40 |
my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
437 |
|
|
|
438 |
|
|
my $ndirs; |
439 |
|
|
|
440 |
|
|
# take the slow route if anything looks fishy |
441 |
root |
1.52 |
if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
442 |
root |
1.40 |
$ndirs = -1; |
443 |
|
|
} else { |
444 |
|
|
# if nlink == 2, we are finished |
445 |
|
|
# on non-posix-fs's, we rely on nlink < 2 |
446 |
|
|
$ndirs = (stat _)[3] - 2 |
447 |
root |
1.58 |
or return $grp->result ([], $entries); |
448 |
root |
1.40 |
} |
449 |
|
|
|
450 |
|
|
# sort into likely dirs and likely nondirs |
451 |
|
|
# dirs == files without ".", short entries first |
452 |
|
|
$entries = [map $_->[0], |
453 |
|
|
sort { $b->[1] cmp $a->[1] } |
454 |
|
|
map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], |
455 |
|
|
@$entries]; |
456 |
|
|
|
457 |
|
|
my (@dirs, @nondirs); |
458 |
|
|
|
459 |
|
|
my ($statcb, $schedcb); |
460 |
|
|
my $nreq = 0; |
461 |
|
|
|
462 |
root |
1.60 |
my $statgrp = add $grp aio_group; |
463 |
|
|
|
464 |
root |
1.40 |
$schedcb = sub { |
465 |
|
|
if (@$entries) { |
466 |
|
|
if ($nreq < $maxreq) { |
467 |
|
|
my $ent = pop @$entries; |
468 |
|
|
$nreq++; |
469 |
root |
1.60 |
add $statgrp aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) }; |
470 |
root |
1.40 |
} |
471 |
|
|
} elsif (!$nreq) { |
472 |
|
|
# finished |
473 |
root |
1.60 |
$statgrp->cancel; |
474 |
root |
1.40 |
undef $statcb; |
475 |
|
|
undef $schedcb; |
476 |
root |
1.60 |
$grp->result (\@dirs, \@nondirs); |
477 |
root |
1.40 |
} |
478 |
|
|
}; |
479 |
|
|
$statcb = sub { |
480 |
|
|
my ($status, $entry) = @_; |
481 |
|
|
|
482 |
|
|
if ($status < 0) { |
483 |
|
|
$nreq--; |
484 |
|
|
push @nondirs, $entry; |
485 |
|
|
&$schedcb; |
486 |
|
|
} else { |
487 |
|
|
# need to check for real directory |
488 |
root |
1.55 |
add $grp aio_lstat "$path/$entry", sub { |
489 |
root |
1.40 |
$nreq--; |
490 |
|
|
|
491 |
|
|
if (-d _) { |
492 |
|
|
push @dirs, $entry; |
493 |
|
|
|
494 |
|
|
if (!--$ndirs) { |
495 |
|
|
push @nondirs, @$entries; |
496 |
|
|
$entries = []; |
497 |
|
|
} |
498 |
|
|
} else { |
499 |
|
|
push @nondirs, $entry; |
500 |
|
|
} |
501 |
|
|
|
502 |
|
|
&$schedcb; |
503 |
|
|
} |
504 |
|
|
} |
505 |
|
|
}; |
506 |
|
|
|
507 |
|
|
&$schedcb while @$entries && $nreq < $maxreq; |
508 |
|
|
}; |
509 |
|
|
}; |
510 |
|
|
}; |
511 |
root |
1.55 |
|
512 |
|
|
$grp |
513 |
root |
1.40 |
} |
514 |
|
|
|
515 |
|
|
=item aio_fsync $fh, $callback->($status) |
516 |
root |
1.1 |
|
517 |
|
|
Asynchronously call fsync on the given filehandle and call the callback |
518 |
|
|
with the fsync result code. |
519 |
|
|
|
520 |
root |
1.40 |
=item aio_fdatasync $fh, $callback->($status) |
521 |
root |
1.1 |
|
522 |
|
|
Asynchronously call fdatasync on the given filehandle and call the |
523 |
root |
1.26 |
callback with the fdatasync result code. |
524 |
|
|
|
525 |
|
|
If this call isn't available because your OS lacks it or it couldn't be |
526 |
|
|
detected, it will be emulated by calling C<fsync> instead. |
527 |
root |
1.1 |
|
528 |
root |
1.58 |
=item aio_group $callback->(...) |
529 |
root |
1.54 |
|
530 |
root |
1.55 |
[EXPERIMENTAL] |
531 |
|
|
|
532 |
|
|
This is a very special aio request: Instead of doing something, it is a |
533 |
|
|
container for other aio requests, which is useful if you want to bundle |
534 |
|
|
many requests into a single, composite, request. |
535 |
|
|
|
536 |
|
|
Returns an object of class L<IO::AIO::GRP>. See its documentation below |
537 |
|
|
for more info. |
538 |
|
|
|
539 |
|
|
Example: |
540 |
|
|
|
541 |
|
|
my $grp = aio_group sub { |
542 |
|
|
print "all stats done\n"; |
543 |
|
|
}; |
544 |
|
|
|
545 |
|
|
add $grp |
546 |
|
|
(aio_stat ...), |
547 |
|
|
(aio_stat ...), |
548 |
|
|
...; |
549 |
|
|
|
550 |
root |
1.63 |
=item aio_nop $callback->() |
551 |
|
|
|
552 |
|
|
This is a special request - it does nothing in itself and is only used for |
553 |
|
|
side effects, such as when you want to add a dummy request to a group so |
554 |
|
|
that finishing the requests in the group depends on executing the given |
555 |
|
|
code. |
556 |
|
|
|
557 |
root |
1.64 |
While this request does nothing, it still goes through the execution |
558 |
|
|
phase and still requires a worker thread. Thus, the callback will not |
559 |
|
|
be executed immediately but only after other requests in the queue have |
560 |
|
|
entered their execution phase. This can be used to measure request |
561 |
|
|
latency. |
562 |
|
|
|
563 |
root |
1.56 |
=item IO::AIO::aio_sleep $fractional_seconds, $callback->() *NOT EXPORTED* |
564 |
root |
1.54 |
|
565 |
|
|
Mainly used for debugging and benchmarking, this aio request puts one of |
566 |
|
|
the request workers to sleep for the given time. |
567 |
|
|
|
568 |
root |
1.56 |
While it is theoretically handy to have simple I/O scheduling requests |
569 |
|
|
like sleep and file handle readable/writable, the overhead this creates |
570 |
|
|
is immense, so do not use this function except to put your application |
571 |
|
|
under artificial I/O pressure. |
572 |
|
|
|
573 |
root |
1.5 |
=back |
574 |
|
|
|
575 |
root |
1.53 |
=head2 IO::AIO::REQ CLASS |
576 |
root |
1.52 |
|
577 |
|
|
All non-aggregate C<aio_*> functions return an object of this class when |
578 |
|
|
called in non-void context. |
579 |
|
|
|
580 |
|
|
A request always moves through the following five states in its lifetime, |
581 |
|
|
in order: B<ready> (request has been created, but has not been executed |
582 |
|
|
yet), B<execute> (request is currently being executed), B<pending> |
583 |
|
|
(request has been executed but callback has not been called yet), |
584 |
|
|
B<result> (results are being processed synchronously, includes calling the |
585 |
|
|
callback) and B<done> (request has reached the end of its lifetime and |
586 |
|
|
holds no resources anymore). |
587 |
|
|
|
588 |
|
|
=over 4 |
589 |
|
|
|
590 |
root |
1.65 |
=item cancel $req |
591 |
root |
1.52 |
|
592 |
|
|
Cancels the request, if possible. Has the effect of skipping execution |
593 |
|
|
when entering the B<execute> state and skipping calling the callback when |
594 |
|
|
entering the the B<result> state, but will leave the request otherwise |
595 |
|
|
untouched. That means that requests that currently execute will not be |
596 |
|
|
stopped and resources held by the request will not be freed prematurely. |
597 |
|
|
|
598 |
root |
1.65 |
=item cb $req $callback->(...) |
599 |
|
|
|
600 |
|
|
Replace (or simply set) the callback registered to the request. |
601 |
|
|
|
602 |
root |
1.52 |
=back |
603 |
|
|
|
604 |
root |
1.55 |
=head2 IO::AIO::GRP CLASS |
605 |
|
|
|
606 |
|
|
This class is a subclass of L<IO::AIO::REQ>, so all its methods apply to |
607 |
|
|
objects of this class, too. |
608 |
|
|
|
609 |
|
|
A IO::AIO::GRP object is a special request that can contain multiple other |
610 |
|
|
aio requests. |
611 |
|
|
|
612 |
|
|
You create one by calling the C<aio_group> constructing function with a |
613 |
|
|
callback that will be called when all contained requests have entered the |
614 |
|
|
C<done> state: |
615 |
|
|
|
616 |
|
|
my $grp = aio_group sub { |
617 |
|
|
print "all requests are done\n"; |
618 |
|
|
}; |
619 |
|
|
|
620 |
|
|
You add requests by calling the C<add> method with one or more |
621 |
|
|
C<IO::AIO::REQ> objects: |
622 |
|
|
|
623 |
|
|
$grp->add (aio_unlink "..."); |
624 |
|
|
|
625 |
root |
1.58 |
add $grp aio_stat "...", sub { |
626 |
|
|
$_[0] or return $grp->result ("error"); |
627 |
|
|
|
628 |
|
|
# add another request dynamically, if first succeeded |
629 |
|
|
add $grp aio_open "...", sub { |
630 |
|
|
$grp->result ("ok"); |
631 |
|
|
}; |
632 |
|
|
}; |
633 |
root |
1.55 |
|
634 |
|
|
This makes it very easy to create composite requests (see the source of |
635 |
|
|
C<aio_move> for an application) that work and feel like simple requests. |
636 |
|
|
|
637 |
root |
1.62 |
=over 4 |
638 |
|
|
|
639 |
|
|
=item * The IO::AIO::GRP objects will be cleaned up during calls to |
640 |
root |
1.55 |
C<IO::AIO::poll_cb>, just like any other request. |
641 |
|
|
|
642 |
root |
1.62 |
=item * They can be canceled like any other request. Canceling will cancel not |
643 |
root |
1.59 |
only the request itself, but also all requests it contains. |
644 |
root |
1.55 |
|
645 |
root |
1.62 |
=item * They can also can also be added to other IO::AIO::GRP objects. |
646 |
root |
1.55 |
|
647 |
root |
1.62 |
=item * You must not add requests to a group from within the group callback (or |
648 |
root |
1.60 |
any later time). |
649 |
|
|
|
650 |
root |
1.62 |
=item * This does not harmonise well with C<max_outstanding>, so best do |
651 |
|
|
not combine C<aio_group> with it. Groups and feeders are recommended for |
652 |
|
|
this kind of concurrency-limiting. |
653 |
|
|
|
654 |
|
|
=back |
655 |
|
|
|
656 |
root |
1.55 |
Their lifetime, simplified, looks like this: when they are empty, they |
657 |
|
|
will finish very quickly. If they contain only requests that are in the |
658 |
|
|
C<done> state, they will also finish. Otherwise they will continue to |
659 |
|
|
exist. |
660 |
|
|
|
661 |
root |
1.57 |
That means after creating a group you have some time to add requests. And |
662 |
|
|
in the callbacks of those requests, you can add further requests to the |
663 |
|
|
group. And only when all those requests have finished will the the group |
664 |
|
|
itself finish. |
665 |
|
|
|
666 |
root |
1.55 |
=over 4 |
667 |
|
|
|
668 |
root |
1.65 |
=item add $grp ... |
669 |
|
|
|
670 |
root |
1.55 |
=item $grp->add (...) |
671 |
|
|
|
672 |
root |
1.57 |
Add one or more requests to the group. Any type of L<IO::AIO::REQ> can |
673 |
|
|
be added, including other groups, as long as you do not create circular |
674 |
|
|
dependencies. |
675 |
|
|
|
676 |
|
|
Returns all its arguments. |
677 |
root |
1.55 |
|
678 |
root |
1.58 |
=item $grp->result (...) |
679 |
|
|
|
680 |
|
|
Set the result value(s) that will be passed to the group callback when all |
681 |
|
|
subrequests have finished. By default, no argument will be passed. |
682 |
|
|
|
683 |
root |
1.65 |
=item feed $grp $callback->($grp) |
684 |
root |
1.60 |
|
685 |
|
|
[VERY EXPERIMENTAL] |
686 |
|
|
|
687 |
|
|
Sets a feeder/generator on this group: every group can have an attached |
688 |
|
|
generator that generates requests if idle. The idea behind this is that, |
689 |
|
|
although you could just queue as many requests as you want in a group, |
690 |
|
|
this might starve other requests for a potentially long time. For |
691 |
|
|
example, C<aio_scandir> might generate hundreds of thousands C<aio_stat> |
692 |
|
|
requests, delaying any later requests for a long time. |
693 |
|
|
|
694 |
|
|
To avoid this, and allow incremental generation of requests, you can |
695 |
|
|
instead a group and set a feeder on it that generates those requests. The |
696 |
root |
1.68 |
feed callback will be called whenever there are few enough (see C<limit>, |
697 |
root |
1.60 |
below) requests active in the group itself and is expected to queue more |
698 |
|
|
requests. |
699 |
|
|
|
700 |
root |
1.68 |
The feed callback can queue as many requests as it likes (i.e. C<add> does |
701 |
|
|
not impose any limits). |
702 |
root |
1.60 |
|
703 |
root |
1.65 |
If the feed does not queue more requests when called, it will be |
704 |
root |
1.60 |
automatically removed from the group. |
705 |
|
|
|
706 |
root |
1.65 |
If the feed limit is C<0>, it will be set to C<2> automatically. |
707 |
root |
1.60 |
|
708 |
|
|
Example: |
709 |
|
|
|
710 |
|
|
# stat all files in @files, but only ever use four aio requests concurrently: |
711 |
|
|
|
712 |
|
|
my $grp = aio_group sub { print "finished\n" }; |
713 |
root |
1.68 |
limit $grp 4; |
714 |
root |
1.65 |
feed $grp sub { |
715 |
root |
1.60 |
my $file = pop @files |
716 |
|
|
or return; |
717 |
|
|
|
718 |
|
|
add $grp aio_stat $file, sub { ... }; |
719 |
root |
1.65 |
}; |
720 |
root |
1.60 |
|
721 |
root |
1.68 |
=item limit $grp $num |
722 |
root |
1.60 |
|
723 |
|
|
Sets the feeder limit for the group: The feeder will be called whenever |
724 |
|
|
the group contains less than this many requests. |
725 |
|
|
|
726 |
|
|
Setting the limit to C<0> will pause the feeding process. |
727 |
|
|
|
728 |
root |
1.55 |
=back |
729 |
|
|
|
730 |
root |
1.5 |
=head2 SUPPORT FUNCTIONS |
731 |
|
|
|
732 |
|
|
=over 4 |
733 |
|
|
|
734 |
|
|
=item $fileno = IO::AIO::poll_fileno |
735 |
|
|
|
736 |
root |
1.20 |
Return the I<request result pipe file descriptor>. This filehandle must be |
737 |
|
|
polled for reading by some mechanism outside this module (e.g. Event or |
738 |
|
|
select, see below or the SYNOPSIS). If the pipe becomes readable you have |
739 |
|
|
to call C<poll_cb> to check the results. |
740 |
root |
1.5 |
|
741 |
|
|
See C<poll_cb> for an example. |
742 |
|
|
|
743 |
|
|
=item IO::AIO::poll_cb |
744 |
|
|
|
745 |
|
|
Process all outstanding events on the result pipe. You have to call this |
746 |
|
|
regularly. Returns the number of events processed. Returns immediately |
747 |
|
|
when no events are outstanding. |
748 |
|
|
|
749 |
root |
1.20 |
Example: Install an Event watcher that automatically calls |
750 |
|
|
IO::AIO::poll_cb with high priority: |
751 |
root |
1.5 |
|
752 |
|
|
Event->io (fd => IO::AIO::poll_fileno, |
753 |
|
|
poll => 'r', async => 1, |
754 |
|
|
cb => \&IO::AIO::poll_cb); |
755 |
|
|
|
756 |
|
|
=item IO::AIO::poll_wait |
757 |
|
|
|
758 |
|
|
Wait till the result filehandle becomes ready for reading (simply does a |
759 |
root |
1.20 |
C<select> on the filehandle. This is useful if you want to synchronously wait |
760 |
root |
1.5 |
for some requests to finish). |
761 |
|
|
|
762 |
|
|
See C<nreqs> for an example. |
763 |
|
|
|
764 |
|
|
=item IO::AIO::nreqs |
765 |
|
|
|
766 |
root |
1.20 |
Returns the number of requests currently outstanding (i.e. for which their |
767 |
|
|
callback has not been invoked yet). |
768 |
root |
1.5 |
|
769 |
|
|
Example: wait till there are no outstanding requests anymore: |
770 |
|
|
|
771 |
|
|
IO::AIO::poll_wait, IO::AIO::poll_cb |
772 |
|
|
while IO::AIO::nreqs; |
773 |
|
|
|
774 |
root |
1.12 |
=item IO::AIO::flush |
775 |
|
|
|
776 |
|
|
Wait till all outstanding AIO requests have been handled. |
777 |
|
|
|
778 |
root |
1.13 |
Strictly equivalent to: |
779 |
|
|
|
780 |
|
|
IO::AIO::poll_wait, IO::AIO::poll_cb |
781 |
|
|
while IO::AIO::nreqs; |
782 |
|
|
|
783 |
|
|
=item IO::AIO::poll |
784 |
|
|
|
785 |
|
|
Waits until some requests have been handled. |
786 |
|
|
|
787 |
|
|
Strictly equivalent to: |
788 |
|
|
|
789 |
|
|
IO::AIO::poll_wait, IO::AIO::poll_cb |
790 |
|
|
if IO::AIO::nreqs; |
791 |
|
|
|
792 |
root |
1.5 |
=item IO::AIO::min_parallel $nthreads |
793 |
|
|
|
794 |
root |
1.61 |
Set the minimum number of AIO threads to C<$nthreads>. The current |
795 |
|
|
default is C<8>, which means eight asynchronous operations can execute |
796 |
|
|
concurrently at any one time (the number of outstanding requests, |
797 |
|
|
however, is unlimited). |
798 |
root |
1.5 |
|
799 |
root |
1.34 |
IO::AIO starts threads only on demand, when an AIO request is queued and |
800 |
|
|
no free thread exists. |
801 |
|
|
|
802 |
root |
1.61 |
It is recommended to keep the number of threads relatively low, as some |
803 |
|
|
Linux kernel versions will scale negatively with the number of threads |
804 |
|
|
(higher parallelity => MUCH higher latency). With current Linux 2.6 |
805 |
|
|
versions, 4-32 threads should be fine. |
806 |
root |
1.5 |
|
807 |
root |
1.34 |
Under most circumstances you don't need to call this function, as the |
808 |
|
|
module selects a default that is suitable for low to moderate load. |
809 |
root |
1.5 |
|
810 |
|
|
=item IO::AIO::max_parallel $nthreads |
811 |
|
|
|
812 |
root |
1.34 |
Sets the maximum number of AIO threads to C<$nthreads>. If more than the |
813 |
|
|
specified number of threads are currently running, this function kills |
814 |
|
|
them. This function blocks until the limit is reached. |
815 |
|
|
|
816 |
|
|
While C<$nthreads> are zero, aio requests get queued but not executed |
817 |
|
|
until the number of threads has been increased again. |
818 |
root |
1.5 |
|
819 |
|
|
This module automatically runs C<max_parallel 0> at program end, to ensure |
820 |
|
|
that all threads are killed and that there are no outstanding requests. |
821 |
|
|
|
822 |
|
|
Under normal circumstances you don't need to call this function. |
823 |
|
|
|
824 |
|
|
=item $oldnreqs = IO::AIO::max_outstanding $nreqs |
825 |
|
|
|
826 |
root |
1.62 |
[DEPRECATED] |
827 |
|
|
|
828 |
root |
1.5 |
Sets the maximum number of outstanding requests to C<$nreqs>. If you |
829 |
|
|
try to queue up more than this number of requests, the caller will block until |
830 |
|
|
some requests have been handled. |
831 |
|
|
|
832 |
|
|
The default is very large, so normally there is no practical limit. If you |
833 |
root |
1.34 |
queue up many requests in a loop it often improves speed if you set |
834 |
root |
1.5 |
this to a relatively low number, such as C<100>. |
835 |
|
|
|
836 |
root |
1.62 |
This function does not work well together with C<aio_group>'s, and their |
837 |
|
|
feeder interface is better suited to limiting concurrency, so do not use |
838 |
|
|
this function. |
839 |
|
|
|
840 |
root |
1.5 |
Under normal circumstances you don't need to call this function. |
841 |
|
|
|
842 |
|
|
=back |
843 |
|
|
|
844 |
root |
1.1 |
=cut |
845 |
|
|
|
846 |
root |
1.2 |
# support function to convert a fd into a perl filehandle |
847 |
|
|
sub _fd2fh { |
848 |
|
|
return undef if $_[0] < 0; |
849 |
|
|
|
850 |
root |
1.23 |
# try to generate nice filehandles |
851 |
|
|
my $sym = "IO::AIO::fd#$_[0]"; |
852 |
|
|
local *$sym; |
853 |
root |
1.25 |
|
854 |
root |
1.27 |
open *$sym, "+<&=$_[0]" # usually works under any unix |
855 |
|
|
or open *$sym, "<&=$_[0]" # cygwin needs this |
856 |
|
|
or open *$sym, ">&=$_[0]" # or this |
857 |
root |
1.2 |
or return undef; |
858 |
|
|
|
859 |
root |
1.23 |
*$sym |
860 |
root |
1.2 |
} |
861 |
|
|
|
862 |
root |
1.61 |
min_parallel 8; |
863 |
root |
1.1 |
|
864 |
|
|
END { |
865 |
|
|
max_parallel 0; |
866 |
|
|
} |
867 |
|
|
|
868 |
|
|
1; |
869 |
|
|
|
870 |
root |
1.27 |
=head2 FORK BEHAVIOUR |
871 |
|
|
|
872 |
root |
1.52 |
This module should do "the right thing" when the process using it forks: |
873 |
|
|
|
874 |
root |
1.34 |
Before the fork, IO::AIO enters a quiescent state where no requests |
875 |
|
|
can be added in other threads and no results will be processed. After |
876 |
|
|
the fork the parent simply leaves the quiescent state and continues |
877 |
|
|
request/result processing, while the child clears the request/result |
878 |
|
|
queue (so the requests started before the fork will only be handled in |
879 |
root |
1.52 |
the parent). Threads will be started on demand until the limit ste in the |
880 |
root |
1.34 |
parent process has been reached again. |
881 |
root |
1.27 |
|
882 |
root |
1.52 |
In short: the parent will, after a short pause, continue as if fork had |
883 |
|
|
not been called, while the child will act as if IO::AIO has not been used |
884 |
|
|
yet. |
885 |
|
|
|
886 |
root |
1.60 |
=head2 MEMORY USAGE |
887 |
|
|
|
888 |
|
|
Each aio request uses - depending on your architecture - around 128 bytes |
889 |
|
|
of memory. In addition, stat requests need a stat buffer (possibly a few |
890 |
|
|
hundred bytes). Perl scalars and other data passed into aio requests will |
891 |
|
|
also be locked. |
892 |
|
|
|
893 |
|
|
This is now awfully much, so queuing lots of requests is not usually a |
894 |
|
|
problem. |
895 |
|
|
|
896 |
|
|
Each thread needs a stack area which is usually around 16k, sometimes much |
897 |
|
|
larger, depending on the OS. |
898 |
|
|
|
899 |
root |
1.1 |
=head1 SEE ALSO |
900 |
|
|
|
901 |
root |
1.68 |
L<Coro::AIO>. |
902 |
root |
1.1 |
|
903 |
|
|
=head1 AUTHOR |
904 |
|
|
|
905 |
|
|
Marc Lehmann <schmorp@schmorp.de> |
906 |
|
|
http://home.schmorp.de/ |
907 |
|
|
|
908 |
|
|
=cut |
909 |
|
|
|