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

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.56 by root, Sun Oct 22 00:53:47 2006 UTC vs.
Revision 1.68 by root, Tue Oct 24 03:17:39 2006 UTC

…		…
18	};	18	};
19		19
20	# version 2+ has request and group objects	20	# version 2+ has request and group objects
21	use IO::AIO 2;	21	use IO::AIO 2;
22		22
		23	aioreq_pri 4; # give next request a very high priority
23	my $req = aio_unlink "/tmp/file", sub { };	24	my $req = aio_unlink "/tmp/file", sub { };
24	$req->cancel; # cancel request if still in queue	25	$req->cancel; # cancel request if still in queue
25		26
26	my $grp = aio_group sub { print "all stats done\n" };	27	my $grp = aio_group sub { print "all stats done\n" };
27	add $grp aio_stat "..." for ...;	28	add $grp aio_stat "..." for ...;
…		…
51		52
52	This module implements asynchronous I/O using whatever means your	53	This module implements asynchronous I/O using whatever means your
53	operating system supports.	54	operating system supports.
54		55
55	Currently, a number of threads are started that execute your read/writes	56	Currently, a number of threads are started that execute your read/writes
56	and signal their completion. You don't need thread support in your libc or	57	and signal their completion. You don't need thread support in perl, and
57	perl, and the threads created by this module will not be visible to the	58	the threads created by this module will not be visible to perl. In the
58	pthreads library. In the future, this module might make use of the native	59	future, this module might make use of the native aio functions available
59	aio functions available on many operating systems. However, they are often	60	on many operating systems. However, they are often not well-supported
60	not well-supported (Linux doesn't allow them on normal files currently,	61	(Linux doesn't allow them on normal files currently, for example),
61	for example), and they would only support aio_read and aio_write, so the	62	and they would only support aio_read and aio_write, so the remaining
62	remaining functionality would have to be implemented using threads anyway.	63	functionality would have to be implemented using threads anyway.
63		64
64	Although the module will work with in the presence of other threads, it is	65	Although the module will work with in the presence of other threads,
65	currently not reentrant, so use appropriate locking yourself, always call	66	it is currently not reentrant in any way, so use appropriate locking
66	C<poll_cb> from within the same thread, or never call C<poll_cb> (or other	67	yourself, always call C<poll_cb> from within the same thread, or never
67	C<aio_> functions) recursively.	68	call C<poll_cb> (or other C<aio_> functions) recursively.
68		69
69	=cut	70	=cut
70		71
71	package IO::AIO;	72	package IO::AIO;
72		73
…		…
76	use base 'Exporter';	77	use base 'Exporter';
77		78
78	BEGIN {	79	BEGIN {
79	our $VERSION = '2.0';	80	our $VERSION = '2.0';
80		81
81	our @EXPORT = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat	82	our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat
82	aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink	83	aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink
83	aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move	84	aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move
84	aio_group);	85	aio_group aio_nop);
85	our @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs);	86	our @EXPORT = (@AIO_REQ, qw(aioreq_pri));
		87	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
		88	min_parallel max_parallel max_outstanding nreqs);
86		89
87	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';	90	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';
88		91
89	require XSLoader;	92	require XSLoader;
90	XSLoader::load ("IO::AIO", $VERSION);	93	XSLoader::load ("IO::AIO", $VERSION);
…		…
120	your pathnames to the locale (or other) encoding in effect in the user	123	your pathnames to the locale (or other) encoding in effect in the user
121	environment, d) use Glib::filename_from_unicode on unicode filenames or e)	124	environment, d) use Glib::filename_from_unicode on unicode filenames or e)
122	use something else.	125	use something else.
123		126
124	=over 4	127	=over 4
		128
		129	=item aioreq_pri $pri
		130
		131	Sets the priority for the next aio request. The default priority
		132	is C<0>, the minimum and maximum priorities are C<-4> and C<4>,
		133	respectively. Requests with higher priority will be serviced first.
		134
		135	The priority will be reset to C<0> after each call to one of the C<aio_>
		136	functions.
125		137
126	=item aio_open $pathname, $flags, $mode, $callback->($fh)	138	=item aio_open $pathname, $flags, $mode, $callback->($fh)
127		139
128	Asynchronously open or create a file and call the callback with a newly	140	Asynchronously open or create a file and call the callback with a newly
129	created filehandle for the file.	141	created filehandle for the file.
…		…
182	print "read $_[0] bytes: <$buffer>\n";	194	print "read $_[0] bytes: <$buffer>\n";
183	};	195	};
184		196
185	=item aio_move $srcpath, $dstpath, $callback->($status)	197	=item aio_move $srcpath, $dstpath, $callback->($status)
186		198
		199	[EXPERIMENTAL due to internal aio_group use]
		200
187	Try to move the I<file> (directories not supported as either source or	201	Try to move the I<file> (directories not supported as either source or
188	destination) from C<$srcpath> to C<$dstpath> and call the callback with	202	destination) from C<$srcpath> to C<$dstpath> and call the callback with
189	the C<0> (error) or C<-1> ok.	203	the C<0> (error) or C<-1> ok.
190		204
191	This is a composite request that tries to rename(2) the file first. If	205	This is a composite request that tries to rename(2) the file first. If
…		…
201	=cut	215	=cut
202		216
203	sub aio_move($$$) {	217	sub aio_move($$$) {
204	my ($src, $dst, $cb) = @_;	218	my ($src, $dst, $cb) = @_;
205		219
206	my $grp = aio_group;	220	my $grp = aio_group $cb;
207		221
208	add $grp aio_rename $src, $dst, sub {	222	add $grp aio_rename $src, $dst, sub {
209	if ($_[0] && $! == EXDEV) {	223	if ($_[0] && $! == EXDEV) {
210	add $grp aio_open $src, O_RDONLY, 0, sub {	224	add $grp aio_open $src, O_RDONLY, 0, sub {
211	if (my $src_fh = $_[0]) {	225	if (my $src_fh = $_[0]) {
…		…
221	chmod $stat[2] & 07777, $dst_fh;	235	chmod $stat[2] & 07777, $dst_fh;
222	chown $stat[4], $stat[5], $dst_fh;	236	chown $stat[4], $stat[5], $dst_fh;
223	close $dst_fh;	237	close $dst_fh;
224		238
225	add $grp aio_unlink $src, sub {	239	add $grp aio_unlink $src, sub {
226	$cb->($_[0]);	240	$grp->result ($_[0]);
227	};	241	};
228	} else {	242	} else {
229	my $errno = $!;	243	my $errno = $!;
230	add $grp aio_unlink $dst, sub {	244	add $grp aio_unlink $dst, sub {
231	$! = $errno;	245	$! = $errno;
232	$cb->(-1);	246	$grp->result (-1);
233	};	247	};
234	}	248	}
235	};	249	};
236	} else {	250	} else {
237	$cb->(-1);	251	$grp->result (-1);
238	}	252	}
239	},	253	},
240		254
241	} else {	255	} else {
242	$cb->(-1);	256	$grp->result (-1);
243	}	257	}
244	};	258	};
245	} else {	259	} else {
246	$cb->($_[0]);	260	$grp->result ($_[0]);
247	}	261	}
248	};	262	};
249		263
250	$grp	264	$grp
251	}	265	}
…		…
343	The callback a single argument which is either C<undef> or an array-ref	357	The callback a single argument which is either C<undef> or an array-ref
344	with the filenames.	358	with the filenames.
345		359
346	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)	360	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
347		361
		362	[EXPERIMENTAL due to internal aio_group use]
		363
348	Scans a directory (similar to C<aio_readdir>) but additionally tries to	364	Scans a directory (similar to C<aio_readdir>) but additionally tries to
349	separate the entries of directory C<$path> into two sets of names, ones	365	separate the entries of directory C<$path> into two sets of names, ones
350	you can recurse into (directories or links to them), and ones you cannot	366	you can recurse into (directories or links to them), and ones you cannot
351	recurse into (everything else).	367	recurse into (everything else).
352		368
353	C<aio_scandir> is a composite request that consists of many sub	369	C<aio_scandir> is a composite request that creates of many sub requests_
354	requests. C<$maxreq> specifies the maximum number of outstanding aio	370	C<$maxreq> specifies the maximum number of outstanding aio requests that
355	requests that this function generates. If it is C<< <= 0 >>, then a	371	this function generates. If it is C<< <= 0 >>, then a suitable default
356	suitable default will be chosen (currently 8).	372	will be chosen (currently 6).
357		373
358	On error, the callback is called without arguments, otherwise it receives	374	On error, the callback is called without arguments, otherwise it receives
359	two array-refs with path-relative entry names.	375	two array-refs with path-relative entry names.
360		376
361	Example:	377	Example:
…		…
398	=cut	414	=cut
399		415
400	sub aio_scandir($$$) {	416	sub aio_scandir($$$) {
401	my ($path, $maxreq, $cb) = @_;	417	my ($path, $maxreq, $cb) = @_;
402		418
403	my $grp = aio_group;	419	my $grp = aio_group $cb;
404		420
405	$maxreq = 8 if $maxreq <= 0;	421	$maxreq = 6 if $maxreq <= 0;
406		422
407	# stat once	423	# stat once
408	add $grp aio_stat $path, sub {	424	add $grp aio_stat $path, sub {
409	return $cb->() if $_[0];	425	return $grp->result () if $_[0];
410	my $now = time;	426	my $now = time;
411	my $hash1 = join ":", (stat _)[0,1,3,7,9];	427	my $hash1 = join ":", (stat _)[0,1,3,7,9];
412		428
413	# read the directory entries	429	# read the directory entries
414	add $grp aio_readdir $path, sub {	430	add $grp aio_readdir $path, sub {
415	my $entries = shift	431	my $entries = shift
416	or return $cb->();	432	or return $grp->result ();
417		433
418	# stat the dir another time	434	# stat the dir another time
419	add $grp aio_stat $path, sub {	435	add $grp aio_stat $path, sub {
420	my $hash2 = join ":", (stat _)[0,1,3,7,9];	436	my $hash2 = join ":", (stat _)[0,1,3,7,9];
421		437
…		…
426	$ndirs = -1;	442	$ndirs = -1;
427	} else {	443	} else {
428	# if nlink == 2, we are finished	444	# if nlink == 2, we are finished
429	# on non-posix-fs's, we rely on nlink < 2	445	# on non-posix-fs's, we rely on nlink < 2
430	$ndirs = (stat _)[3] - 2	446	$ndirs = (stat _)[3] - 2
431	or return $cb->([], $entries);	447	or return $grp->result ([], $entries);
432	}	448	}
433		449
434	# sort into likely dirs and likely nondirs	450	# sort into likely dirs and likely nondirs
435	# dirs == files without ".", short entries first	451	# dirs == files without ".", short entries first
436	$entries = [map $_->[0],	452	$entries = [map $_->[0],
…		…
441	my (@dirs, @nondirs);	457	my (@dirs, @nondirs);
442		458
443	my ($statcb, $schedcb);	459	my ($statcb, $schedcb);
444	my $nreq = 0;	460	my $nreq = 0;
445		461
		462	my $statgrp = add $grp aio_group;
		463
446	$schedcb = sub {	464	$schedcb = sub {
447	if (@$entries) {	465	if (@$entries) {
448	if ($nreq < $maxreq) {	466	if ($nreq < $maxreq) {
449	my $ent = pop @$entries;	467	my $ent = pop @$entries;
450	$nreq++;	468	$nreq++;
451	add $grp aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) };	469	add $statgrp aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) };
452	}	470	}
453	} elsif (!$nreq) {	471	} elsif (!$nreq) {
454	# finished	472	# finished
		473	$statgrp->cancel;
455	undef $statcb;	474	undef $statcb;
456	undef $schedcb;	475	undef $schedcb;
457	$cb->(\@dirs, \@nondirs) if $cb;	476	$grp->result (\@dirs, \@nondirs);
458	undef $cb;
459	}	477	}
460	};	478	};
461	$statcb = sub {	479	$statcb = sub {
462	my ($status, $entry) = @_;	480	my ($status, $entry) = @_;
463		481
…		…
505	callback with the fdatasync result code.	523	callback with the fdatasync result code.
506		524
507	If this call isn't available because your OS lacks it or it couldn't be	525	If this call isn't available because your OS lacks it or it couldn't be
508	detected, it will be emulated by calling C<fsync> instead.	526	detected, it will be emulated by calling C<fsync> instead.
509		527
510	=item aio_group $callback->()	528	=item aio_group $callback->(...)
511		529
512	[EXPERIMENTAL]	530	[EXPERIMENTAL]
513		531
514	This is a very special aio request: Instead of doing something, it is a	532	This is a very special aio request: Instead of doing something, it is a
515	container for other aio requests, which is useful if you want to bundle	533	container for other aio requests, which is useful if you want to bundle
…		…
526		544
527	add $grp	545	add $grp
528	(aio_stat ...),	546	(aio_stat ...),
529	(aio_stat ...),	547	(aio_stat ...),
530	...;	548	...;
		549
		550	=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	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.
531		562
532	=item IO::AIO::aio_sleep $fractional_seconds, $callback->() NOT EXPORTED	563	=item IO::AIO::aio_sleep $fractional_seconds, $callback->() NOT EXPORTED
533		564
534	Mainly used for debugging and benchmarking, this aio request puts one of	565	Mainly used for debugging and benchmarking, this aio request puts one of
535	the request workers to sleep for the given time.	566	the request workers to sleep for the given time.
…		…
554	callback) and B<done> (request has reached the end of its lifetime and	585	callback) and B<done> (request has reached the end of its lifetime and
555	holds no resources anymore).	586	holds no resources anymore).
556		587
557	=over 4	588	=over 4
558		589
559	=item $req->cancel	590	=item cancel $req
560		591
561	Cancels the request, if possible. Has the effect of skipping execution	592	Cancels the request, if possible. Has the effect of skipping execution
562	when entering the B<execute> state and skipping calling the callback when	593	when entering the B<execute> state and skipping calling the callback when
563	entering the the B<result> state, but will leave the request otherwise	594	entering the the B<result> state, but will leave the request otherwise
564	untouched. That means that requests that currently execute will not be	595	untouched. That means that requests that currently execute will not be
565	stopped and resources held by the request will not be freed prematurely.	596	stopped and resources held by the request will not be freed prematurely.
566		597
		598	=item cb $req $callback->(...)
		599
		600	Replace (or simply set) the callback registered to the request.
		601
567	=back	602	=back
568		603
569	=head2 IO::AIO::GRP CLASS	604	=head2 IO::AIO::GRP CLASS
570		605
571	This class is a subclass of L<IO::AIO::REQ>, so all its methods apply to	606	This class is a subclass of L<IO::AIO::REQ>, so all its methods apply to
…		…
585	You add requests by calling the C<add> method with one or more	620	You add requests by calling the C<add> method with one or more
586	C<IO::AIO::REQ> objects:	621	C<IO::AIO::REQ> objects:
587		622
588	$grp->add (aio_unlink "...");	623	$grp->add (aio_unlink "...");
589		624
590	add $grp aio_stat "...", sub { ... };	625	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	};
591		633
592	This makes it very easy to create composite requests (see the source of	634	This makes it very easy to create composite requests (see the source of
593	C<aio_move> for an application) that work and feel like simple requests.	635	C<aio_move> for an application) that work and feel like simple requests.
594		636
		637	=over 4
		638
595	The IO::AIO::GRP objects will be cleaned up during calls to	639	=item * The IO::AIO::GRP objects will be cleaned up during calls to
596	C<IO::AIO::poll_cb>, just like any other request.	640	C<IO::AIO::poll_cb>, just like any other request.
597		641
598	They can be canceled like any other request. Canceling will cancel not	642	=item * They can be canceled like any other request. Canceling will cancel not
599	just the request itself, but also all requests it contains.	643	only the request itself, but also all requests it contains.
600		644
601	They can also can also be added to other IO::AIO::GRP objects.	645	=item * They can also can also be added to other IO::AIO::GRP objects.
		646
		647	=item * You must not add requests to a group from within the group callback (or
		648	any later time).
		649
		650	=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
602		655
603	Their lifetime, simplified, looks like this: when they are empty, they	656	Their lifetime, simplified, looks like this: when they are empty, they
604	will finish very quickly. If they contain only requests that are in the	657	will finish very quickly. If they contain only requests that are in the
605	C<done> state, they will also finish. Otherwise they will continue to	658	C<done> state, they will also finish. Otherwise they will continue to
606	exist.	659	exist.
607		660
		661	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
608	=over 4	666	=over 4
609		667
		668	=item add $grp ...
		669
610	=item $grp->add (...)	670	=item $grp->add (...)
611		671
612	=item add $grp ...	672	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.
613		675
614	Add one or more	676	Returns all its arguments.
615	Cancels the request, if possible. Has the effect of skipping execution	677
616	when entering the B<execute> state and skipping calling the callback when	678	=item $grp->result (...)
617	entering the the B<result> state, but will leave the request otherwise	679
618	untouched. That means that requests that currently execute will not be	680	Set the result value(s) that will be passed to the group callback when all
619	stopped and resources held by the request will not be freed prematurely.	681	subrequests have finished. By default, no argument will be passed.
		682
		683	=item feed $grp $callback->($grp)
		684
		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	feed callback will be called whenever there are few enough (see C<limit>,
		697	below) requests active in the group itself and is expected to queue more
		698	requests.
		699
		700	The feed callback can queue as many requests as it likes (i.e. C<add> does
		701	not impose any limits).
		702
		703	If the feed does not queue more requests when called, it will be
		704	automatically removed from the group.
		705
		706	If the feed limit is C<0>, it will be set to C<2> automatically.
		707
		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	limit $grp 4;
		714	feed $grp sub {
		715	my $file = pop @files
		716	or return;
		717
		718	add $grp aio_stat $file, sub { ... };
		719	};
		720
		721	=item limit $grp $num
		722
		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.
620		727
621	=back	728	=back
622		729
623	=head2 SUPPORT FUNCTIONS	730	=head2 SUPPORT FUNCTIONS
624		731
…		…
682	IO::AIO::poll_wait, IO::AIO::poll_cb	789	IO::AIO::poll_wait, IO::AIO::poll_cb
683	if IO::AIO::nreqs;	790	if IO::AIO::nreqs;
684		791
685	=item IO::AIO::min_parallel $nthreads	792	=item IO::AIO::min_parallel $nthreads
686		793
687	Set the minimum number of AIO threads to C<$nthreads>. The current default	794	Set the minimum number of AIO threads to C<$nthreads>. The current
688	is C<4>, which means four asynchronous operations can be done at one time	795	default is C<8>, which means eight asynchronous operations can execute
689	(the number of outstanding operations, however, is unlimited).	796	concurrently at any one time (the number of outstanding requests,
		797	however, is unlimited).
690		798
691	IO::AIO starts threads only on demand, when an AIO request is queued and	799	IO::AIO starts threads only on demand, when an AIO request is queued and
692	no free thread exists.	800	no free thread exists.
693		801
694	It is recommended to keep the number of threads low, as some Linux	802	It is recommended to keep the number of threads relatively low, as some
695	kernel versions will scale negatively with the number of threads (higher	803	Linux kernel versions will scale negatively with the number of threads
696	parallelity => MUCH higher latency). With current Linux 2.6 versions, 4-32	804	(higher parallelity => MUCH higher latency). With current Linux 2.6
697	threads should be fine.	805	versions, 4-32 threads should be fine.
698		806
699	Under most circumstances you don't need to call this function, as the	807	Under most circumstances you don't need to call this function, as the
700	module selects a default that is suitable for low to moderate load.	808	module selects a default that is suitable for low to moderate load.
701		809
702	=item IO::AIO::max_parallel $nthreads	810	=item IO::AIO::max_parallel $nthreads
…		…
713		821
714	Under normal circumstances you don't need to call this function.	822	Under normal circumstances you don't need to call this function.
715		823
716	=item $oldnreqs = IO::AIO::max_outstanding $nreqs	824	=item $oldnreqs = IO::AIO::max_outstanding $nreqs
717		825
		826	[DEPRECATED]
		827
718	Sets the maximum number of outstanding requests to C<$nreqs>. If you	828	Sets the maximum number of outstanding requests to C<$nreqs>. If you
719	try to queue up more than this number of requests, the caller will block until	829	try to queue up more than this number of requests, the caller will block until
720	some requests have been handled.	830	some requests have been handled.
721		831
722	The default is very large, so normally there is no practical limit. If you	832	The default is very large, so normally there is no practical limit. If you
723	queue up many requests in a loop it often improves speed if you set	833	queue up many requests in a loop it often improves speed if you set
724	this to a relatively low number, such as C<100>.	834	this to a relatively low number, such as C<100>.
		835
		836	This function does not work well together with C<aio_group>'s, and their
		837	feeder interface is better suited to limiting concurrency, so do not use
		838	this function.
725		839
726	Under normal circumstances you don't need to call this function.	840	Under normal circumstances you don't need to call this function.
727		841
728	=back	842	=back
729		843
…		…
743	or return undef;	857	or return undef;
744		858
745	*$sym	859	*$sym
746	}	860	}
747		861
748	min_parallel 4;	862	min_parallel 8;
749		863
750	END {	864	END {
751	max_parallel 0;	865	max_parallel 0;
752	}	866	}
753		867
…		…
767		881
768	In short: the parent will, after a short pause, continue as if fork had	882	In short: the parent will, after a short pause, continue as if fork had
769	not been called, while the child will act as if IO::AIO has not been used	883	not been called, while the child will act as if IO::AIO has not been used
770	yet.	884	yet.
771		885
		886	=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
772	=head1 SEE ALSO	899	=head1 SEE ALSO
773		900
774	L<Coro>, L<Linux::AIO> (obsolete).	901	L<Coro::AIO>.
775		902
776	=head1 AUTHOR	903	=head1 AUTHOR
777		904
778	Marc Lehmann <schmorp@schmorp.de>	905	Marc Lehmann <schmorp@schmorp.de>
779	http://home.schmorp.de/	906	http://home.schmorp.de/

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.56 by root, Sun Oct 22 00:53:47 2006 UTC vs. Revision 1.68 by root, Tue Oct 24 03:17:39 2006 UTC

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Comparing IO-AIO/AIO.pm (file contents):
Revision 1.56 by root, Sun Oct 22 00:53:47 2006 UTC vs.
Revision 1.68 by root, Tue Oct 24 03:17:39 2006 UTC