[ViewVC] Diff of: cvs/IO-AIO/AIO.pm

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.22 by root, Wed Jul 20 21:55:27 2005 UTC vs.
Revision 1.27 by root, Tue Aug 16 22:22:18 2005 UTC

…		…
56		56
57	=cut	57	=cut
58		58
59	package IO::AIO;	59	package IO::AIO;
60		60
		61	no warnings;
		62
61	use base 'Exporter';	63	use base 'Exporter';
62		64
63	use Fcntl ();	65	use Fcntl ();
64		66
65	BEGIN {	67	BEGIN {
66	$VERSION = 0.9;	68	$VERSION = 1.1;
67		69
68	@EXPORT = qw(aio_read aio_write aio_open aio_close aio_stat aio_lstat aio_unlink	70	@EXPORT = qw(aio_read aio_write aio_open aio_close aio_stat aio_lstat aio_unlink
69	aio_fsync aio_fdatasync aio_readahead);	71	aio_rmdir aio_symlink aio_fsync aio_fdatasync aio_readahead);
70	@EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs);	72	@EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs);
71		73
72	require XSLoader;	74	require XSLoader;
73	XSLoader::load IO::AIO, $VERSION;	75	XSLoader::load IO::AIO, $VERSION;
74	}	76	}
…		…
83	which must be a code reference. This code reference will get called with	85	which must be a code reference. This code reference will get called with
84	the syscall return code (e.g. most syscalls return C<-1> on error, unlike	86	the syscall return code (e.g. most syscalls return C<-1> on error, unlike
85	perl, which usually delivers "false") as it's sole argument when the given	87	perl, which usually delivers "false") as it's sole argument when the given
86	syscall has been executed asynchronously.	88	syscall has been executed asynchronously.
87		89
88	All functions that expect a filehandle will also accept a file descriptor.	90	All functions expecting a filehandle keep a copy of the filehandle
		91	internally until the request has finished.
89		92
90	The filenames you pass to these routines I<must> be absolute. The reason	93	The filenames you pass to these routines I<must> be absolute. The reason
91	for this is that at the time the request is being executed, the current	94	for this is that at the time the request is being executed, the current
92	working directory could have changed. Alternatively, you can make sure	95	working directory could have changed. Alternatively, you can make sure
93	that you never change the current working directory.	96	that you never change the current working directory.
…		…
149	print "read $_[0] bytes: <$buffer>\n";	152	print "read $_[0] bytes: <$buffer>\n";
150	};	153	};
151		154
152	=item aio_readahead $fh,$offset,$length, $callback	155	=item aio_readahead $fh,$offset,$length, $callback
153		156
154	Asynchronously reads the specified byte range into the page cache, using
155	the C<readahead> syscall. If that syscall doesn't exist (likely if your OS
156	isn't Linux) the status will be C<-1> and C<$!> is set to C<ENOSYS>.
157
158	C<aio_readahead> populates the page cache with data from a file so that	157	C<aio_readahead> populates the page cache with data from a file so that
159	subsequent reads from that file will not block on disk I/O. The C<$offset>	158	subsequent reads from that file will not block on disk I/O. The C<$offset>
160	argument specifies the starting point from which data is to be read and	159	argument specifies the starting point from which data is to be read and
161	C<$length> specifies the number of bytes to be read. I/O is performed in	160	C<$length> specifies the number of bytes to be read. I/O is performed in
162	whole pages, so that offset is effectively rounded down to a page boundary	161	whole pages, so that offset is effectively rounded down to a page boundary
163	and bytes are read up to the next page boundary greater than or equal to	162	and bytes are read up to the next page boundary greater than or equal to
164	(off-set+length). C<aio_readahead> does not read beyond the end of the	163	(off-set+length). C<aio_readahead> does not read beyond the end of the
165	file. The current file offset of the file is left unchanged.	164	file. The current file offset of the file is left unchanged.
166		165
		166	If that syscall doesn't exist (likely if your OS isn't Linux) it will be
		167	emulated by simply reading the data, which would have a similar effect.
		168
167	=item aio_stat $fh_or_path, $callback	169	=item aio_stat $fh_or_path, $callback
168		170
169	=item aio_lstat $fh, $callback	171	=item aio_lstat $fh, $callback
170		172
171	Works like perl's C<stat> or C<lstat> in void context. The callback will	173	Works like perl's C<stat> or C<lstat> in void context. The callback will
…		…
189	=item aio_unlink $pathname, $callback	191	=item aio_unlink $pathname, $callback
190		192
191	Asynchronously unlink (delete) a file and call the callback with the	193	Asynchronously unlink (delete) a file and call the callback with the
192	result code.	194	result code.
193		195
		196	=item aio_rmdir $pathname, $callback
		197
		198	Asynchronously rmdir (delete) a directory and call the callback with the
		199	result code.
		200
194	=item aio_fsync $fh, $callback	201	=item aio_fsync $fh, $callback
195		202
196	Asynchronously call fsync on the given filehandle and call the callback	203	Asynchronously call fsync on the given filehandle and call the callback
197	with the fsync result code.	204	with the fsync result code.
198		205
199	=item aio_fdatasync $fh, $callback	206	=item aio_fdatasync $fh, $callback
200		207
201	Asynchronously call fdatasync on the given filehandle and call the	208	Asynchronously call fdatasync on the given filehandle and call the
202	callback with the fdatasync result code. Might set C<$!> to C<ENOSYS> if	209	callback with the fdatasync result code.
203	C<fdatasync> is not available.	210
		211	If this call isn't available because your OS lacks it or it couldn't be
		212	detected, it will be emulated by calling C<fsync> instead.
204		213
205	=back	214	=back
206		215
207	=head2 SUPPORT FUNCTIONS	216	=head2 SUPPORT FUNCTIONS
208		217
…		…
310		319
311	# support function to convert a fd into a perl filehandle	320	# support function to convert a fd into a perl filehandle
312	sub _fd2fh {	321	sub _fd2fh {
313	return undef if $_[0] < 0;	322	return undef if $_[0] < 0;
314		323
315	# try to be perl5.6-compatible	324	# try to generate nice filehandles
316	local *AIO_FH;	325	my $sym = "IO::AIO::fd#$_[0]";
317	open AIO_FH, "+<&=$_[0]"	326	local *$sym;
		327
		328	open *$sym, "+<&=$_[0]" # usually works under any unix
		329	or open *$sym, "<&=$_[0]" # cygwin needs this
		330	or open *$sym, ">&=$_[0]" # or this
318	or return undef;	331	or return undef;
319		332
320	*AIO_FH	333	*$sym
321	}	334	}
322		335
323	min_parallel 4;	336	min_parallel 4;
324		337
325	END {	338	END {
326	max_parallel 0;	339	max_parallel 0;
327	}	340	}
328		341
329	1;	342	1;
330		343
		344	=head2 FORK BEHAVIOUR
		345
		346	IO::AIO handles all outstanding AIO requests before the fork, destroys all
		347	AIO threads, and recreates them in both the parent and the child after the
		348	fork.
		349
		350
331	=head1 SEE ALSO	351	=head1 SEE ALSO
332		352
333	L<Coro>, L<Linux::AIO>.	353	L<Coro>, L<Linux::AIO>.
334		354
335	=head1 AUTHOR	355	=head1 AUTHOR

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.22 by root, Wed Jul 20 21:55:27 2005 UTC vs. Revision 1.27 by root, Tue Aug 16 22:22:18 2005 UTC

Diff Legend

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.22 by root, Wed Jul 20 21:55:27 2005 UTC vs.
Revision 1.27 by root, Tue Aug 16 22:22:18 2005 UTC