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

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.71 by root, Tue Oct 24 11:57:30 2006 UTC vs.
Revision 1.80 by root, Thu Oct 26 16:28:33 2006 UTC

…		…
51	=head1 DESCRIPTION	51	=head1 DESCRIPTION
52		52
53	This module implements asynchronous I/O using whatever means your	53	This module implements asynchronous I/O using whatever means your
54	operating system supports.	54	operating system supports.
55		55
56	Currently, a number of threads are started that execute your read/writes	56	In this version, a number of threads are started that execute your
57	and signal their completion. You don't need thread support in perl, and	57	requests and signal their completion. You don't need thread support
58	the threads created by this module will not be visible to perl. In the	58	in perl, and the threads created by this module will not be visible
59	future, this module might make use of the native aio functions available	59	to perl. In the future, this module might make use of the native aio
60	on many operating systems. However, they are often not well-supported	60	functions available on many operating systems. However, they are often
61	(Linux doesn't allow them on normal files currently, for example),	61	not well-supported or restricted (Linux doesn't allow them on normal
62	and they would only support aio_read and aio_write, so the remaining	62	files currently, for example), and they would only support aio_read and
63	functionality would have to be implemented using threads anyway.	63	aio_write, so the remaining functionality would have to be implemented
		64	using threads anyway.
64		65
65	Although the module will work with in the presence of other threads,	66	Although the module will work with in the presence of other (Perl-)
66	it is currently not reentrant in any way, so use appropriate locking	67	threads, it is currently not reentrant in any way, so use appropriate
67	yourself, always call C<poll_cb> from within the same thread, or never	68	locking yourself, always call C<poll_cb> from within the same thread, or
68	call C<poll_cb> (or other C<aio_> functions) recursively.	69	never call C<poll_cb> (or other C<aio_> functions) recursively.
		70
		71	=head1 REQUEST ANATOMY AND LIFETIME
		72
		73	Every C<aio_*> function creates a request. which is a C data structure not
		74	directly visible to Perl.
		75
		76	If called in non-void context, every request function returns a Perl
		77	object representing the request. In void context, nothing is returned,
		78	which saves a bit of memory.
		79
		80	The perl object is a fairly standard ref-to-hash object. The hash contents
		81	are not used by IO::AIO so you are free to store anything you like in it.
		82
		83	During their existance, aio requests travel through the following states,
		84	in order:
		85
		86	=over 4
		87
		88	=item ready
		89
		90	Immediately after a request is created it is put into the ready state,
		91	waiting for a thread to execute it.
		92
		93	=item execute
		94
		95	A thread has accepted the request for processing and is currently
		96	executing it (e.g. blocking in read).
		97
		98	=item pending
		99
		100	The request has been executed and is waiting for result processing.
		101
		102	While request submission and execution is fully asynchronous, result
		103	processing is not and relies on the perl interpreter calling C<poll_cb>
		104	(or another function with the same effect).
		105
		106	=item result
		107
		108	The request results are processed synchronously by C<poll_cb>.
		109
		110	The C<poll_cb> function will process all outstanding aio requests by
		111	calling their callbacks, freeing memory associated with them and managing
		112	any groups they are contained in.
		113
		114	=item done
		115
		116	Request has reached the end of its lifetime and holds no resources anymore
		117	(except possibly for the Perl object, but its connection to the actual
		118	aio request is severed and calling its methods will either do nothing or
		119	result in a runtime error).
69		120
70	=cut	121	=cut
71		122
72	package IO::AIO;	123	package IO::AIO;
73		124
…		…
83	aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink	134	aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink
84	aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move	135	aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move
85	aio_group aio_nop);	136	aio_group aio_nop);
86	our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice));	137	our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice));
87	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush	138	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
88	min_parallel max_parallel max_outstanding nreqs);	139	min_parallel max_parallel nreqs nready npending);
89		140
90	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';	141	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';
91		142
92	require XSLoader;	143	require XSLoader;
93	XSLoader::load ("IO::AIO", $VERSION);	144	XSLoader::load ("IO::AIO", $VERSION);
…		…
124	environment, d) use Glib::filename_from_unicode on unicode filenames or e)	175	environment, d) use Glib::filename_from_unicode on unicode filenames or e)
125	use something else.	176	use something else.
126		177
127	=over 4	178	=over 4
128		179
129	=item aioreq_pri $pri	180	=item $prev_pri = aioreq_pri [$pri]
130		181
131	Sets the priority for the next aio request. The default priority	182	Returns the priority value that would be used for the next request and, if
		183	C<$pri> is given, sets the priority for the next aio request.
		184
132	is C<0>, the minimum and maximum priorities are C<-4> and C<4>,	185	The default priority is C<0>, the minimum and maximum priorities are C<-4>
133	respectively. Requests with higher priority will be serviced first.	186	and C<4>, respectively. Requests with higher priority will be serviced
		187	first.
134		188
135	The priority will be reset to C<0> after each call to one of the C<aio_>	189	The priority will be reset to C<0> after each call to one of the C<aio_*>
136	functions.	190	functions.
137		191
138	Example: open a file with low priority, then read something from it with	192	Example: open a file with low priority, then read something from it with
139	higher priority so the read request is serviced before other low priority	193	higher priority so the read request is serviced before other low priority
140	open requests (potentially spamming the cache):	194	open requests (potentially spamming the cache):
…		…
232	=cut	286	=cut
233		287
234	sub aio_move($$$) {	288	sub aio_move($$$) {
235	my ($src, $dst, $cb) = @_;	289	my ($src, $dst, $cb) = @_;
236		290
		291	my $pri = aioreq_pri;
237	my $grp = aio_group $cb;	292	my $grp = aio_group $cb;
238		293
		294	aioreq_pri $pri;
239	add $grp aio_rename $src, $dst, sub {	295	add $grp aio_rename $src, $dst, sub {
240	if ($_[0] && $! == EXDEV) {	296	if ($_[0] && $! == EXDEV) {
		297	aioreq_pri $pri;
241	add $grp aio_open $src, O_RDONLY, 0, sub {	298	add $grp aio_open $src, O_RDONLY, 0, sub {
242	if (my $src_fh = $_[0]) {	299	if (my $src_fh = $_[0]) {
243	my @stat = stat $src_fh;	300	my @stat = stat $src_fh;
244		301
		302	aioreq_pri $pri;
245	add $grp aio_open $dst, O_WRONLY, 0200, sub {	303	add $grp aio_open $dst, O_WRONLY, 0200, sub {
246	if (my $dst_fh = $_[0]) {	304	if (my $dst_fh = $_[0]) {
		305	aioreq_pri $pri;
247	add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {	306	add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
248	close $src_fh;	307	close $src_fh;
249		308
250	if ($_[0] == $stat[7]) {	309	if ($_[0] == $stat[7]) {
251	utime $stat[8], $stat[9], $dst;	310	utime $stat[8], $stat[9], $dst;
252	chmod $stat[2] & 07777, $dst_fh;	311	chmod $stat[2] & 07777, $dst_fh;
253	chown $stat[4], $stat[5], $dst_fh;	312	chown $stat[4], $stat[5], $dst_fh;
254	close $dst_fh;	313	close $dst_fh;
255		314
		315	aioreq_pri $pri;
256	add $grp aio_unlink $src, sub {	316	add $grp aio_unlink $src, sub {
257	$grp->result ($_[0]);	317	$grp->result ($_[0]);
258	};	318	};
259	} else {	319	} else {
260	my $errno = $!;	320	my $errno = $!;
		321	aioreq_pri $pri;
261	add $grp aio_unlink $dst, sub {	322	add $grp aio_unlink $dst, sub {
262	$! = $errno;	323	$! = $errno;
263	$grp->result (-1);	324	$grp->result (-1);
264	};	325	};
265	}	326	}
…		…
375	with the filenames.	436	with the filenames.
376		437
377	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)	438	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
378		439
379	Scans a directory (similar to C<aio_readdir>) but additionally tries to	440	Scans a directory (similar to C<aio_readdir>) but additionally tries to
380	separate the entries of directory C<$path> into two sets of names, ones	441	efficiently separate the entries of directory C<$path> into two sets of
381	you can recurse into (directories or links to them), and ones you cannot	442	names, directories you can recurse into (directories), and ones you cannot
382	recurse into (everything else).	443	recurse into (everything else, including symlinks to directories).
383		444
384	C<aio_scandir> is a composite request that creates of many sub requests_	445	C<aio_scandir> is a composite request that creates of many sub requests_
385	C<$maxreq> specifies the maximum number of outstanding aio requests that	446	C<$maxreq> specifies the maximum number of outstanding aio requests that
386	this function generates. If it is C<< <= 0 >>, then a suitable default	447	this function generates. If it is C<< <= 0 >>, then a suitable default
387	will be chosen (currently 6).	448	will be chosen (currently 6).
…		…
429	=cut	490	=cut
430		491
431	sub aio_scandir($$$) {	492	sub aio_scandir($$$) {
432	my ($path, $maxreq, $cb) = @_;	493	my ($path, $maxreq, $cb) = @_;
433		494
		495	my $pri = aioreq_pri;
		496
434	my $grp = aio_group $cb;	497	my $grp = aio_group $cb;
435		498
436	$maxreq = 6 if $maxreq <= 0;	499	$maxreq = 6 if $maxreq <= 0;
437		500
438	# stat once	501	# stat once
		502	aioreq_pri $pri;
439	add $grp aio_stat $path, sub {	503	add $grp aio_stat $path, sub {
440	return $grp->result () if $_[0];	504	return $grp->result () if $_[0];
441	my $now = time;	505	my $now = time;
442	my $hash1 = join ":", (stat _)[0,1,3,7,9];	506	my $hash1 = join ":", (stat _)[0,1,3,7,9];
443		507
444	# read the directory entries	508	# read the directory entries
		509	aioreq_pri $pri;
445	add $grp aio_readdir $path, sub {	510	add $grp aio_readdir $path, sub {
446	my $entries = shift	511	my $entries = shift
447	or return $grp->result ();	512	or return $grp->result ();
448		513
449	# stat the dir another time	514	# stat the dir another time
		515	aioreq_pri $pri;
450	add $grp aio_stat $path, sub {	516	add $grp aio_stat $path, sub {
451	my $hash2 = join ":", (stat _)[0,1,3,7,9];	517	my $hash2 = join ":", (stat _)[0,1,3,7,9];
452		518
453	my $ndirs;	519	my $ndirs;
454		520
…		…
469	map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],	535	map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
470	@$entries];	536	@$entries];
471		537
472	my (@dirs, @nondirs);	538	my (@dirs, @nondirs);
473		539
474	my ($statcb, $schedcb);
475	my $nreq = 0;
476
477	my $statgrp = add $grp aio_group;	540	my $statgrp = add $grp aio_group sub {
		541	$grp->result (\@dirs, \@nondirs);
		542	};
478		543
479	$schedcb = sub {	544	limit $statgrp $maxreq;
480	if (@$entries) {	545	feed $statgrp sub {
481	if ($nreq < $maxreq) {	546	return unless @$entries;
482	my $ent = pop @$entries;	547	my $entry = pop @$entries;
		548
		549	aioreq_pri $pri;
		550	add $statgrp aio_stat "$path/$entry/.", sub {
		551	if ($_[0] < 0) {
		552	push @nondirs, $entry;
		553	} else {
		554	# need to check for real directory
		555	aioreq_pri $pri;
		556	add $statgrp aio_lstat "$path/$entry", sub {
		557	if (-d _) {
		558	push @dirs, $entry;
		559
		560	unless (--$ndirs) {
		561	push @nondirs, @$entries;
		562	feed $statgrp;
		563	}
		564	} else {
		565	push @nondirs, $entry;
		566	}
483	$nreq++;	567	}
484	add $statgrp aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) };
485	}	568	}
486	} elsif (!$nreq) {
487	# finished
488	$statgrp->cancel;
489	undef $statcb;
490	undef $schedcb;
491	$grp->result (\@dirs, \@nondirs);
492	}	569	};
493	};	570	};
494	$statcb = sub {
495	my ($status, $entry) = @_;
496
497	if ($status < 0) {
498	$nreq--;
499	push @nondirs, $entry;
500	&$schedcb;
501	} else {
502	# need to check for real directory
503	add $grp aio_lstat "$path/$entry", sub {
504	$nreq--;
505
506	if (-d _) {
507	push @dirs, $entry;
508
509	if (!--$ndirs) {
510	push @nondirs, @$entries;
511	$entries = [];
512	}
513	} else {
514	push @nondirs, $entry;
515	}
516
517	&$schedcb;
518	}
519	}
520	};
521
522	&$schedcb while @$entries && $nreq < $maxreq;
523	};	571	};
524	};	572	};
525	};	573	};
526		574
527	$grp	575	$grp
…		…
539		587
540	If this call isn't available because your OS lacks it or it couldn't be	588	If this call isn't available because your OS lacks it or it couldn't be
541	detected, it will be emulated by calling C<fsync> instead.	589	detected, it will be emulated by calling C<fsync> instead.
542		590
543	=item aio_group $callback->(...)	591	=item aio_group $callback->(...)
544
545	[EXPERIMENTAL]
546		592
547	This is a very special aio request: Instead of doing something, it is a	593	This is a very special aio request: Instead of doing something, it is a
548	container for other aio requests, which is useful if you want to bundle	594	container for other aio requests, which is useful if you want to bundle
549	many requests into a single, composite, request with a definite callback	595	many requests into a single, composite, request with a definite callback
550	and the ability to cancel the whole request with its subrequests.	596	and the ability to cancel the whole request with its subrequests.
…		…
591	=head2 IO::AIO::REQ CLASS	637	=head2 IO::AIO::REQ CLASS
592		638
593	All non-aggregate C<aio_*> functions return an object of this class when	639	All non-aggregate C<aio_*> functions return an object of this class when
594	called in non-void context.	640	called in non-void context.
595		641
596	A request always moves through the following five states in its lifetime,
597	in order: B<ready> (request has been created, but has not been executed
598	yet), B<execute> (request is currently being executed), B<pending>
599	(request has been executed but callback has not been called yet),
600	B<result> (results are being processed synchronously, includes calling the
601	callback) and B<done> (request has reached the end of its lifetime and
602	holds no resources anymore).
603
604	=over 4	642	=over 4
605		643
606	=item cancel $req	644	=item cancel $req
607		645
608	Cancels the request, if possible. Has the effect of skipping execution	646	Cancels the request, if possible. Has the effect of skipping execution
…		…
661	=item * They can also can also be added to other IO::AIO::GRP objects.	699	=item * They can also can also be added to other IO::AIO::GRP objects.
662		700
663	=item * You must not add requests to a group from within the group callback (or	701	=item * You must not add requests to a group from within the group callback (or
664	any later time).	702	any later time).
665		703
666	=item * This does not harmonise well with C<max_outstanding>, so best do
667	not combine C<aio_group> with it. Groups and feeders are recommended for
668	this kind of concurrency-limiting.
669
670	=back	704	=back
671		705
672	Their lifetime, simplified, looks like this: when they are empty, they	706	Their lifetime, simplified, looks like this: when they are empty, they
673	will finish very quickly. If they contain only requests that are in the	707	will finish very quickly. If they contain only requests that are in the
674	C<done> state, they will also finish. Otherwise they will continue to	708	C<done> state, they will also finish. Otherwise they will continue to
…		…
689	be added, including other groups, as long as you do not create circular	723	be added, including other groups, as long as you do not create circular
690	dependencies.	724	dependencies.
691		725
692	Returns all its arguments.	726	Returns all its arguments.
693		727
		728	=item $grp->cancel_subs
		729
		730	Cancel all subrequests and clears any feeder, but not the group request
		731	itself. Useful when you queued a lot of events but got a result early.
		732
694	=item $grp->result (...)	733	=item $grp->result (...)
695		734
696	Set the result value(s) that will be passed to the group callback when all	735	Set the result value(s) that will be passed to the group callback when all
697	subrequests have finished. By default, no argument will be passed.	736	subrequests have finished and set thre groups errno to the current value
		737	of errno (just like calling C<errno> without an error number). By default,
		738	no argument will be passed and errno is zero.
		739
		740	=item $grp->errno ([$errno])
		741
		742	Sets the group errno value to C<$errno>, or the current value of errno
		743	when the argument is missing.
		744
		745	Every aio request has an associated errno value that is restored when
		746	the callback is invoked. This method lets you change this value from its
		747	default (0).
		748
		749	Calling C<result> will also set errno, so make sure you either set C<$!>
		750	before the call to C<result>, or call c<errno> after it.
698		751
699	=item feed $grp $callback->($grp)	752	=item feed $grp $callback->($grp)
700
701	[VERY EXPERIMENTAL]
702		753
703	Sets a feeder/generator on this group: every group can have an attached	754	Sets a feeder/generator on this group: every group can have an attached
704	generator that generates requests if idle. The idea behind this is that,	755	generator that generates requests if idle. The idea behind this is that,
705	although you could just queue as many requests as you want in a group,	756	although you could just queue as many requests as you want in a group,
706	this might starve other requests for a potentially long time. For	757	this might starve other requests for a potentially long time. For
…		…
760		811
761	Process all outstanding events on the result pipe. You have to call this	812	Process all outstanding events on the result pipe. You have to call this
762	regularly. Returns the number of events processed. Returns immediately	813	regularly. Returns the number of events processed. Returns immediately
763	when no events are outstanding.	814	when no events are outstanding.
764		815
		816	If not all requests were processed for whatever reason, the filehandle
		817	will still be ready when C<poll_cb> returns.
		818
765	Example: Install an Event watcher that automatically calls	819	Example: Install an Event watcher that automatically calls
766	IO::AIO::poll_cb with high priority:	820	IO::AIO::poll_cb with high priority:
767		821
768	Event->io (fd => IO::AIO::poll_fileno,	822	Event->io (fd => IO::AIO::poll_fileno,
769	poll => 'r', async => 1,	823	poll => 'r', async => 1,
770	cb => \&IO::AIO::poll_cb);	824	cb => \&IO::AIO::poll_cb);
771		825
		826	=item IO::AIO::poll_some $max_requests
		827
		828	Similar to C<poll_cb>, but only processes up to C<$max_requests> requests
		829	at a time.
		830
		831	Useful if you want to ensure some level of interactiveness when perl is
		832	not fast enough to process all requests in time.
		833
		834	Example: Install an Event watcher that automatically calls
		835	IO::AIO::poll_some with low priority, to ensure that other parts of the
		836	program get the CPU sometimes even under high AIO load.
		837
		838	Event->io (fd => IO::AIO::poll_fileno,
		839	poll => 'r', nice => 1,
		840	cb => sub { IO::AIO::poll_some 256 });
		841
772	=item IO::AIO::poll_wait	842	=item IO::AIO::poll_wait
773		843
774	Wait till the result filehandle becomes ready for reading (simply does a	844	Wait till the result filehandle becomes ready for reading (simply does a
775	C<select> on the filehandle. This is useful if you want to synchronously wait	845	C<select> on the filehandle. This is useful if you want to synchronously wait
776	for some requests to finish).	846	for some requests to finish).
777		847
778	See C<nreqs> for an example.	848	See C<nreqs> for an example.
779		849
780	=item IO::AIO::nreqs	850	=item IO::AIO::nreqs
781		851
782	Returns the number of requests currently outstanding (i.e. for which their	852	Returns the number of requests currently in the ready, execute or pending
783	callback has not been invoked yet).	853	states (i.e. for which their callback has not been invoked yet).
784		854
785	Example: wait till there are no outstanding requests anymore:	855	Example: wait till there are no outstanding requests anymore:
786		856
787	IO::AIO::poll_wait, IO::AIO::poll_cb	857	IO::AIO::poll_wait, IO::AIO::poll_cb
788	while IO::AIO::nreqs;	858	while IO::AIO::nreqs;
		859
		860	=item IO::AIO::nready
		861
		862	Returns the number of requests currently in the ready state (not yet
		863	executed).
		864
		865	=item IO::AIO::npending
		866
		867	Returns the number of requests currently in the pending state (executed,
		868	but not yet processed by poll_cb).
789		869
790	=item IO::AIO::flush	870	=item IO::AIO::flush
791		871
792	Wait till all outstanding AIO requests have been handled.	872	Wait till all outstanding AIO requests have been handled.
793		873
…		…
835	This module automatically runs C<max_parallel 0> at program end, to ensure	915	This module automatically runs C<max_parallel 0> at program end, to ensure
836	that all threads are killed and that there are no outstanding requests.	916	that all threads are killed and that there are no outstanding requests.
837		917
838	Under normal circumstances you don't need to call this function.	918	Under normal circumstances you don't need to call this function.
839		919
840	=item $oldnreqs = IO::AIO::max_outstanding $nreqs	920	=item $oldmaxreqs = IO::AIO::max_outstanding $maxreqs
841		921
842	[DEPRECATED]	922	This is a very bad function to use in interactive programs because it
		923	blocks, and a bad way to reduce concurrency because it is inexact: Better
		924	use an C<aio_group> together with a feed callback.
843		925
844	Sets the maximum number of outstanding requests to C<$nreqs>. If you	926	Sets the maximum number of outstanding requests to C<$nreqs>. If you
845	try to queue up more than this number of requests, the caller will block until	927	to queue up more than this number of requests, the next call to the
846	some requests have been handled.	928	C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>)
		929	function will block until the limit is no longer exceeded.
847		930
848	The default is very large, so normally there is no practical limit. If you	931	The default value is very large, so there is no practical limit on the
849	queue up many requests in a loop it often improves speed if you set	932	number of outstanding requests.
850	this to a relatively low number, such as C<100>.
851		933
852	This function does not work well together with C<aio_group>'s, and their	934	You can still queue as many requests as you want. Therefore,
853	feeder interface is better suited to limiting concurrency, so do not use	935	C<max_oustsanding> is mainly useful in simple scripts (with low values) or
854	this function.	936	as a stop gap to shield against fatal memory overflow (with large values).
855
856	Under normal circumstances you don't need to call this function.
857		937
858	=back	938	=back
859		939
860	=cut	940	=cut
861		941
…		…
888	This module should do "the right thing" when the process using it forks:	968	This module should do "the right thing" when the process using it forks:
889		969
890	Before the fork, IO::AIO enters a quiescent state where no requests	970	Before the fork, IO::AIO enters a quiescent state where no requests
891	can be added in other threads and no results will be processed. After	971	can be added in other threads and no results will be processed. After
892	the fork the parent simply leaves the quiescent state and continues	972	the fork the parent simply leaves the quiescent state and continues
893	request/result processing, while the child clears the request/result	973	request/result processing, while the child frees the request/result queue
894	queue (so the requests started before the fork will only be handled in	974	(so that the requests started before the fork will only be handled in the
895	the parent). Threads will be started on demand until the limit ste in the	975	parent). Threads will be started on demand until the limit set in the
896	parent process has been reached again.	976	parent process has been reached again.
897		977
898	In short: the parent will, after a short pause, continue as if fork had	978	In short: the parent will, after a short pause, continue as if fork had
899	not been called, while the child will act as if IO::AIO has not been used	979	not been called, while the child will act as if IO::AIO has not been used
900	yet.	980	yet.
901		981
902	=head2 MEMORY USAGE	982	=head2 MEMORY USAGE
903		983
		984	Per-request usage:
		985
904	Each aio request uses - depending on your architecture - around 128 bytes	986	Each aio request uses - depending on your architecture - around 100-200
905	of memory. In addition, stat requests need a stat buffer (possibly a few	987	bytes of memory. In addition, stat requests need a stat buffer (possibly
906	hundred bytes). Perl scalars and other data passed into aio requests will	988	a few hundred bytes), readdir requires a result buffer and so on. Perl
907	also be locked.	989	scalars and other data passed into aio requests will also be locked and
		990	will consume memory till the request has entered the done state.
908		991
909	This is now awfully much, so queuing lots of requests is not usually a	992	This is now awfully much, so queuing lots of requests is not usually a
910	problem.	993	problem.
911		994
912	Each thread needs a stack area which is usually around 16k, sometimes much	995	Per-thread usage:
913	larger, depending on the OS.	996
		997	In the execution phase, some aio requests require more memory for
		998	temporary buffers, and each thread requires a stack and other data
		999	structures (usually around 16k-128k, depending on the OS).
		1000
		1001	=head1 KNOWN BUGS
		1002
		1003	Known bugs will be fixed in the next release.
914		1004
915	=head1 SEE ALSO	1005	=head1 SEE ALSO
916		1006
917	L<Coro::AIO>.	1007	L<Coro::AIO>.
918		1008

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.71 by root, Tue Oct 24 11:57:30 2006 UTC vs. Revision 1.80 by root, Thu Oct 26 16:28:33 2006 UTC

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Comparing IO-AIO/AIO.pm (file contents):
Revision 1.71 by root, Tue Oct 24 11:57:30 2006 UTC vs.
Revision 1.80 by root, Thu Oct 26 16:28:33 2006 UTC