[ViewVC] Diff of: cvs/Coro/Coro.pm

Comparing Coro/Coro.pm (file contents):
Revision 1.36 by root, Mon Sep 24 01:36:20 2001 UTC vs.
Revision 1.128 by root, Wed Sep 19 21:39:15 2007 UTC

…		…
8		8
9	async {	9	async {
10	# some asynchronous thread of execution	10	# some asynchronous thread of execution
11	};	11	};
12		12
13	# alternatively create an async process like this:	13	# alternatively create an async coroutine like this:
14		14
15	sub some_func : Coro {	15	sub some_func : Coro {
16	# some more async code	16	# some more async code
17	}	17	}
18		18
19	cede;	19	cede;
20		20
21	=head1 DESCRIPTION	21	=head1 DESCRIPTION
22		22
23	This module collection manages coroutines. Coroutines are similar to	23	This module collection manages coroutines. Coroutines are similar
24	Threads but don't run in parallel.	24	to threads but don't run in parallel at the same time even on SMP
		25	machines. The specific flavor of coroutine used in this module also
		26	guarantees you that it will not switch between coroutines unless
		27	necessary, at easily-identified points in your program, so locking and
		28	parallel access are rarely an issue, making coroutine programming much
		29	safer than threads programming.
25		30
26	This module is still experimental, see the BUGS section below.	31	(Perl, however, does not natively support real threads but instead does a
		32	very slow and memory-intensive emulation of processes using threads. This
		33	is a performance win on Windows machines, and a loss everywhere else).
27		34
28	In this module, coroutines are defined as "callchain + lexical variables	35	In this module, coroutines are defined as "callchain + lexical variables +
29	+ @_ + $_ + $@ + $^W + C stack), that is, a coroutine has it's own	36	@_ + $_ + $@ + $/ + C stack), that is, a coroutine has its own callchain,
30	callchain, it's own set of lexicals and it's own set of perl's most	37	its own set of lexicals and its own set of perls most important global
31	important global variables.	38	variables.
32		39
33	=cut	40	=cut
34		41
35	package Coro;	42	package Coro;
36		43
		44	use strict;
37	no warnings qw(uninitialized);	45	no warnings "uninitialized";
38		46
39	use Coro::State;	47	use Coro::State;
40		48
41	use base Exporter;	49	use base qw(Coro::State Exporter);
42		50
43	$VERSION = 0.5;	51	our $idle; # idle handler
		52	our $main; # main coroutine
		53	our $current; # current coroutine
44		54
		55	our $VERSION = '3.7';
		56
45	@EXPORT = qw(async cede schedule terminate current);	57	our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub);
46	%EXPORT_TAGS = (	58	our %EXPORT_TAGS = (
47	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],	59	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],
48	);	60	);
49	@EXPORT_OK = @{$EXPORT_TAGS{prio}};	61	our @EXPORT_OK = (@{$EXPORT_TAGS{prio}}, qw(nready));
50		62
51	{	63	{
52	my @async;	64	my @async;
53	my $init;	65	my $init;
54		66
55	# this way of handling attributes simply is NOT scalable ;()	67	# this way of handling attributes simply is NOT scalable ;()
56	sub import {	68	sub import {
		69	no strict 'refs';
		70
57	Coro->export_to_level(1, @_);	71	Coro->export_to_level (1, @_);
		72
58	my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};	73	my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};
59	*{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"} = sub {	74	*{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"} = sub {
60	my ($package, $ref) = (shift, shift);	75	my ($package, $ref) = (shift, shift);
61	my @attrs;	76	my @attrs;
62	for (@_) {	77	for (@_) {
…		…
77	};	92	};
78	}	93	}
79		94
80	}	95	}
81		96
		97	=over 4
		98
82	=item $main	99	=item $main
83		100
84	This coroutine represents the main program.	101	This coroutine represents the main program.
85		102
86	=cut	103	=cut
87		104
88	our $main = new Coro;	105	$main = new Coro;
89		106
90	=item $current (or as function: current)	107	=item $current (or as function: current)
91		108
92	The current coroutine (the last coroutine switched to). The initial value is C<$main> (of course).	109	The current coroutine (the last coroutine switched to). The initial value
		110	is C<$main> (of course).
		111
		112	This variable is B<strictly> I<read-only>. It is provided for performance
		113	reasons. If performance is not essential you are encouraged to use the
		114	C<Coro::current> function instead.
93		115
94	=cut	116	=cut
95		117
96	# maybe some other module used Coro::Specific before...	118	# maybe some other module used Coro::Specific before...
97	if ($current) {
98	$main->{specific} = $current->{specific};	119	$main->{specific} = $current->{specific}
99	}	120	if $current;
100		121
101	our $current = $main;	122	_set_current $main;
102		123
103	sub current() { $current }	124	sub current() { $current }
104		125
105	=item $idle	126	=item $idle
106		127
107	The coroutine to switch to when no other coroutine is running. The default	128	A callback that is called whenever the scheduler finds no ready coroutines
108	implementation prints "FATAL: deadlock detected" and exits.	129	to run. The default implementation prints "FATAL: deadlock detected" and
		130	exits, because the program has no other way to continue.
109		131
110	=cut	132	This hook is overwritten by modules such as C<Coro::Timer> and
		133	C<Coro::Event> to wait on an external event that hopefully wake up a
		134	coroutine so the scheduler can run it.
111		135
112	# should be done using priorities :(	136	Please note that if your callback recursively invokes perl (e.g. for event
113	our $idle = new Coro sub {	137	handlers), then it must be prepared to be called recursively.
114	print STDERR "FATAL: deadlock detected\n";	138
115	exit(51);	139	=cut
		140
		141	$idle = sub {
		142	require Carp;
		143	Carp::croak ("FATAL: deadlock detected");
116	};	144	};
		145
		146	sub _cancel {
		147	my ($self) = @_;
		148
		149	# free coroutine data and mark as destructed
		150	$self->_destroy
		151	or return;
		152
		153	# call all destruction callbacks
		154	$_->(@{$self->{status}})
		155	for @{(delete $self->{destroy_cb}) \|\| []};
		156	}
117		157
118	# this coroutine is necessary because a coroutine	158	# this coroutine is necessary because a coroutine
119	# cannot destroy itself.	159	# cannot destroy itself.
120	my @destroy;	160	my @destroy;
		161	my $manager;
		162
121	my $manager = new Coro sub {	163	$manager = new Coro sub {
122	while() {	164	while () {
123	delete ((pop @destroy)->{_coro_state}) while @destroy;	165	(shift @destroy)->_cancel
		166	while @destroy;
		167
124	&schedule;	168	&schedule;
125	}	169	}
126	};	170	};
127		171
		172	$manager->prio (PRIO_MAX);
		173
128	# static methods. not really.	174	# static methods. not really.
129		175
		176	=back
		177
130	=head2 STATIC METHODS	178	=head2 STATIC METHODS
131		179
132	Static methods are actually functions that operate on the current process only.	180	Static methods are actually functions that operate on the current coroutine only.
133		181
134	=over 4	182	=over 4
135		183
136	=item async { ... } [@args...]	184	=item async { ... } [@args...]
137		185
138	Create a new asynchronous process and return it's process object	186	Create a new asynchronous coroutine and return it's coroutine object
139	(usually unused). When the sub returns the new process is automatically	187	(usually unused). When the sub returns the new coroutine is automatically
140	terminated.	188	terminated.
		189
		190	Calling C<exit> in a coroutine will do the same as calling exit outside
		191	the coroutine. Likewise, when the coroutine dies, the program will exit,
		192	just as it would in the main program.
141		193
142	# create a new coroutine that just prints its arguments	194	# create a new coroutine that just prints its arguments
143	async {	195	async {
144	print "@_\n";	196	print "@_\n";
145	} 1,2,3,4;	197	} 1,2,3,4;
146		198
147	The coderef you submit MUST NOT be a closure that refers to variables
148	in an outer scope. This does NOT work. Pass arguments into it instead.
149
150	=cut	199	=cut
151		200
152	sub async(&@) {	201	sub async(&@) {
153	my $pid = new Coro @_;	202	my $coro = new Coro @_;
154	$manager->ready; # this ensures that the stack is cloned from the manager
155	$pid->ready;	203	$coro->ready;
156	$pid;	204	$coro
		205	}
		206
		207	=item async_pool { ... } [@args...]
		208
		209	Similar to C<async>, but uses a coroutine pool, so you should not call
		210	terminate or join (although you are allowed to), and you get a coroutine
		211	that might have executed other code already (which can be good or bad :).
		212
		213	Also, the block is executed in an C<eval> context and a warning will be
		214	issued in case of an exception instead of terminating the program, as
		215	C<async> does. As the coroutine is being reused, stuff like C<on_destroy>
		216	will not work in the expected way, unless you call terminate or cancel,
		217	which somehow defeats the purpose of pooling.
		218
		219	The priority will be reset to C<0> after each job, otherwise the coroutine
		220	will be re-used "as-is".
		221
		222	The pool size is limited to 8 idle coroutines (this can be adjusted by
		223	changing $Coro::POOL_SIZE), and there can be as many non-idle coros as
		224	required.
		225
		226	If you are concerned about pooled coroutines growing a lot because a
		227	single C<async_pool> used a lot of stackspace you can e.g. C<async_pool {
		228	terminate }> once per second or so to slowly replenish the pool.
		229
		230	=cut
		231
		232	our $POOL_SIZE = 8;
		233	our @pool;
		234
		235	sub pool_handler {
		236	while () {
		237	eval {
		238	my ($cb, @arg) = @{ delete $current->{_invoke} or return };
		239	$cb->(@arg);
		240	};
		241	warn $@ if $@;
		242
		243	last if @pool >= $POOL_SIZE;
		244	push @pool, $current;
		245
		246	$current->save (Coro::State::SAVE_DEF);
		247	$current->prio (0);
		248	schedule;
		249	}
		250	}
		251
		252	sub async_pool(&@) {
		253	# this is also inlined into the unlock_scheduler
		254	my $coro = (pop @pool) \|\| do {
		255	my $coro = new Coro \&pool_handler;
		256	$coro->{desc} = "async_pool";
		257	$coro
		258	};
		259
		260	$coro->{_invoke} = [@_];
		261	$coro->ready;
		262
		263	$coro
157	}	264	}
158		265
159	=item schedule	266	=item schedule
160		267
161	Calls the scheduler. Please note that the current process will not be put	268	Calls the scheduler. Please note that the current coroutine will not be put
162	into the ready queue, so calling this function usually means you will	269	into the ready queue, so calling this function usually means you will
163	never be called again.	270	never be called again unless something else (e.g. an event handler) calls
		271	ready.
164		272
165	=cut	273	The canonical way to wait on external events is this:
		274
		275	{
		276	# remember current coroutine
		277	my $current = $Coro::current;
		278
		279	# register a hypothetical event handler
		280	on_event_invoke sub {
		281	# wake up sleeping coroutine
		282	$current->ready;
		283	undef $current;
		284	};
		285
		286	# call schedule until event occurred.
		287	# in case we are woken up for other reasons
		288	# (current still defined), loop.
		289	Coro::schedule while $current;
		290	}
166		291
167	=item cede	292	=item cede
168		293
169	"Cede" to other processes. This function puts the current process into the	294	"Cede" to other coroutines. This function puts the current coroutine into the
170	ready queue and calls C<schedule>, which has the effect of giving up the	295	ready queue and calls C<schedule>, which has the effect of giving up the
171	current "timeslice" to other coroutines of the same or higher priority.	296	current "timeslice" to other coroutines of the same or higher priority.
172		297
173	=cut	298	Returns true if at least one coroutine switch has happened.
174		299
		300	=item Coro::cede_notself
		301
		302	Works like cede, but is not exported by default and will cede to any
		303	coroutine, regardless of priority, once.
		304
		305	Returns true if at least one coroutine switch has happened.
		306
175	=item terminate	307	=item terminate [arg...]
176		308
177	Terminates the current process.	309	Terminates the current coroutine with the given status values (see L<cancel>).
178
179	Future versions of this function will allow result arguments.
180		310
181	=cut	311	=cut
182		312
183	sub terminate {	313	sub terminate {
184	$current->cancel;	314	$current->cancel (@_);
185	&schedule;
186	die; # NORETURN
187	}	315	}
188		316
189	=back	317	=back
190		318
191	# dynamic methods	319	# dynamic methods
192		320
193	=head2 PROCESS METHODS	321	=head2 COROUTINE METHODS
194		322
195	These are the methods you can call on process objects.	323	These are the methods you can call on coroutine objects.
196		324
197	=over 4	325	=over 4
198		326
199	=item new Coro \&sub [, @args...]	327	=item new Coro \&sub [, @args...]
200		328
201	Create a new process and return it. When the sub returns the process	329	Create a new coroutine and return it. When the sub returns the coroutine
202	automatically terminates. To start the process you must first put it into	330	automatically terminates as if C<terminate> with the returned values were
		331	called. To make the coroutine run you must first put it into the ready queue
203	the ready queue by calling the ready method.	332	by calling the ready method.
204		333
205	The coderef you submit MUST NOT be a closure that refers to variables	334	See C<async> for additional discussion.
206	in an outer scope. This does NOT work. Pass arguments into it instead.
207		335
208	=cut	336	=cut
209		337
210	sub _newcoro {	338	sub _run_coro {
211	terminate &{+shift};	339	terminate &{+shift};
212	}	340	}
213		341
214	sub new {	342	sub new {
215	my $class = shift;	343	my $class = shift;
216	bless {
217	_coro_state => (new Coro::State $_[0] && \&_newcoro, @_),
218	}, $class;
219	}
220		344
221	=item $process->ready	345	$class->SUPER::new (\&_run_coro, @_)
		346	}
222		347
223	Put the current process into the ready queue.	348	=item $success = $coroutine->ready
224		349
225	=cut	350	Put the given coroutine into the ready queue (according to it's priority)
		351	and return true. If the coroutine is already in the ready queue, do nothing
		352	and return false.
226		353
227	=item $process->cancel	354	=item $is_ready = $coroutine->is_ready
228		355
229	Like C<terminate>, but terminates the specified process instead.	356	Return wether the coroutine is currently the ready queue or not,
		357
		358	=item $coroutine->cancel (arg...)
		359
		360	Terminates the given coroutine and makes it return the given arguments as
		361	status (default: the empty list). Never returns if the coroutine is the
		362	current coroutine.
230		363
231	=cut	364	=cut
232		365
233	sub cancel {	366	sub cancel {
		367	my $self = shift;
		368	$self->{status} = [@_];
		369
		370	if ($current == $self) {
234	push @destroy, $_[0];	371	push @destroy, $self;
235	$manager->ready;	372	$manager->ready;
236	&schedule if $current == $_[0];	373	&schedule while 1;
		374	} else {
		375	$self->_cancel;
		376	}
237	}	377	}
238		378
		379	=item $coroutine->join
		380
		381	Wait until the coroutine terminates and return any values given to the
		382	C<terminate> or C<cancel> functions. C<join> can be called multiple times
		383	from multiple coroutine.
		384
		385	=cut
		386
		387	sub join {
		388	my $self = shift;
		389
		390	unless ($self->{status}) {
		391	my $current = $current;
		392
		393	push @{$self->{destroy_cb}}, sub {
		394	$current->ready;
		395	undef $current;
		396	};
		397
		398	&schedule while $current;
		399	}
		400
		401	wantarray ? @{$self->{status}} : $self->{status}[0];
		402	}
		403
		404	=item $coroutine->on_destroy (\&cb)
		405
		406	Registers a callback that is called when this coroutine gets destroyed,
		407	but before it is joined. The callback gets passed the terminate arguments,
		408	if any.
		409
		410	=cut
		411
		412	sub on_destroy {
		413	my ($self, $cb) = @_;
		414
		415	push @{ $self->{destroy_cb} }, $cb;
		416	}
		417
239	=item $oldprio = $process->prio($newprio)	418	=item $oldprio = $coroutine->prio ($newprio)
240		419
241	Sets the priority of the process. Higher priority processes get run before	420	Sets (or gets, if the argument is missing) the priority of the
242	lower priority processes. Priorities are smalled signed integer (currently	421	coroutine. Higher priority coroutines get run before lower priority
		422	coroutines. Priorities are small signed integers (currently -4 .. +3),
243	-4 .. +3), that you can refer to using PRIO_xxx constants (use the import	423	that you can refer to using PRIO_xxx constants (use the import tag :prio
244	tag :prio to get then):	424	to get then):
245		425
246	PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN	426	PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN
247	3 > 1 > 0 > -1 > -3 > -4	427	3 > 1 > 0 > -1 > -3 > -4
248		428
249	# set priority to HIGH	429	# set priority to HIGH
250	current->prio(PRIO_HIGH);	430	current->prio(PRIO_HIGH);
251		431
252	The idle coroutine ($Coro::idle) always has a lower priority than any	432	The idle coroutine ($Coro::idle) always has a lower priority than any
253	existing coroutine.	433	existing coroutine.
254		434
255	Changing the priority of the current process will take effect immediately,	435	Changing the priority of the current coroutine will take effect immediately,
256	but changing the priority of processes in the ready queue (but not	436	but changing the priority of coroutines in the ready queue (but not
257	running) will only take effect after the next schedule (of that	437	running) will only take effect after the next schedule (of that
258	process). This is a bug that will be fixed in some future version.	438	coroutine). This is a bug that will be fixed in some future version.
259		439
260	=cut
261
262	sub prio {
263	my $old = $_[0]{prio};
264	$_[0]{prio} = $_[1] if @_ > 1;
265	$old;
266	}
267
268	=item $newprio = $process->nice($change)	440	=item $newprio = $coroutine->nice ($change)
269		441
270	Similar to C<prio>, but subtract the given value from the priority (i.e.	442	Similar to C<prio>, but subtract the given value from the priority (i.e.
271	higher values mean lower priority, just as in unix).	443	higher values mean lower priority, just as in unix).
272		444
273	=cut	445	=item $olddesc = $coroutine->desc ($newdesc)
274		446
275	sub nice {	447	Sets (or gets in case the argument is missing) the description for this
276	$_[0]{prio} -= $_[1];	448	coroutine. This is just a free-form string you can associate with a coroutine.
		449
		450	=cut
		451
		452	sub desc {
		453	my $old = $_[0]{desc};
		454	$_[0]{desc} = $_[1] if @_ > 1;
		455	$old;
277	}	456	}
278		457
279	=back	458	=back
280		459
		460	=head2 GLOBAL FUNCTIONS
		461
		462	=over 4
		463
		464	=item Coro::nready
		465
		466	Returns the number of coroutines that are currently in the ready state,
		467	i.e. that can be switched to. The value C<0> means that the only runnable
		468	coroutine is the currently running one, so C<cede> would have no effect,
		469	and C<schedule> would cause a deadlock unless there is an idle handler
		470	that wakes up some coroutines.
		471
		472	=item my $guard = Coro::guard { ... }
		473
		474	This creates and returns a guard object. Nothing happens until the object
		475	gets destroyed, in which case the codeblock given as argument will be
		476	executed. This is useful to free locks or other resources in case of a
		477	runtime error or when the coroutine gets canceled, as in both cases the
		478	guard block will be executed. The guard object supports only one method,
		479	C<< ->cancel >>, which will keep the codeblock from being executed.
		480
		481	Example: set some flag and clear it again when the coroutine gets canceled
		482	or the function returns:
		483
		484	sub do_something {
		485	my $guard = Coro::guard { $busy = 0 };
		486	$busy = 1;
		487
		488	# do something that requires $busy to be true
		489	}
		490
		491	=cut
		492
		493	sub guard(&) {
		494	bless \(my $cb = $_[0]), "Coro::guard"
		495	}
		496
		497	sub Coro::guard::cancel {
		498	${$_[0]} = sub { };
		499	}
		500
		501	sub Coro::guard::DESTROY {
		502	${$_[0]}->();
		503	}
		504
		505
		506	=item unblock_sub { ... }
		507
		508	This utility function takes a BLOCK or code reference and "unblocks" it,
		509	returning the new coderef. This means that the new coderef will return
		510	immediately without blocking, returning nothing, while the original code
		511	ref will be called (with parameters) from within its own coroutine.
		512
		513	The reason this function exists is that many event libraries (such as the
		514	venerable L<Event\|Event> module) are not coroutine-safe (a weaker form
		515	of thread-safety). This means you must not block within event callbacks,
		516	otherwise you might suffer from crashes or worse.
		517
		518	This function allows your callbacks to block by executing them in another
		519	coroutine where it is safe to block. One example where blocking is handy
		520	is when you use the L<Coro::AIO\|Coro::AIO> functions to save results to
		521	disk.
		522
		523	In short: simply use C<unblock_sub { ... }> instead of C<sub { ... }> when
		524	creating event callbacks that want to block.
		525
		526	=cut
		527
		528	our @unblock_queue;
		529
		530	# we create a special coro because we want to cede,
		531	# to reduce pressure on the coro pool (because most callbacks
		532	# return immediately and can be reused) and because we cannot cede
		533	# inside an event callback.
		534	our $unblock_scheduler = async {
		535	while () {
		536	while (my $cb = pop @unblock_queue) {
		537	# this is an inlined copy of async_pool
		538	my $coro = (pop @pool or new Coro \&pool_handler);
		539
		540	$coro->{_invoke} = $cb;
		541	$coro->ready;
		542	cede; # for short-lived callbacks, this reduces pressure on the coro pool
		543	}
		544	schedule; # sleep well
		545	}
		546	};
		547
		548	sub unblock_sub(&) {
		549	my $cb = shift;
		550
		551	sub {
		552	unshift @unblock_queue, [$cb, @_];
		553	$unblock_scheduler->ready;
		554	}
		555	}
		556
		557	=back
		558
281	=cut	559	=cut
282		560
283	1;	561	1;
284		562
285	=head1 BUGS/LIMITATIONS	563	=head1 BUGS/LIMITATIONS
286		564
287	- you must make very sure that no coro is still active on global destruction.	565	- you must make very sure that no coro is still active on global
288	very bad things might happen otherwise (usually segfaults).	566	destruction. very bad things might happen otherwise (usually segfaults).
		567
289	- this module is not thread-safe. You must only ever use this module from	568	- this module is not thread-safe. You should only ever use this module
290	the same thread (this requirement might be loosened in the future to	569	from the same thread (this requirement might be loosened in the future
291	allow per-thread schedulers, but Coro::State does not yet allow this).	570	to allow per-thread schedulers, but Coro::State does not yet allow
		571	this).
292		572
293	=head1 SEE ALSO	573	=head1 SEE ALSO
294		574
295	L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,	575	Support/Utility: L<Coro::Cont>, L<Coro::Specific>, L<Coro::State>, L<Coro::Util>.
296	L<Coro::Signal>, L<Coro::State>, L<Coro::Event>, L<Coro::RWLock>,	576
297	L<Coro::Handle>, L<Coro::Socket>.	577	Locking/IPC: L<Coro::Signal>, L<Coro::Channel>, L<Coro::Semaphore>, L<Coro::SemaphoreSet>, L<Coro::RWLock>.
		578
		579	Event/IO: L<Coro::Timer>, L<Coro::Event>, L<Coro::Handle>, L<Coro::Socket>, L<Coro::Select>.
		580
		581	Embedding: L<Coro:MakeMaker>
298		582
299	=head1 AUTHOR	583	=head1 AUTHOR
300		584
301	Marc Lehmann <pcg@goof.com>	585	Marc Lehmann <schmorp@schmorp.de>
302	http://www.goof.com/pcg/marc/	586	http://home.schmorp.de/
303		587
304	=cut	588	=cut
305		589

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Comparing Coro/Coro.pm (file contents): Revision 1.36 by root, Mon Sep 24 01:36:20 2001 UTC vs. Revision 1.128 by root, Wed Sep 19 21:39:15 2007 UTC

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Comparing Coro/Coro.pm (file contents):
Revision 1.36 by root, Mon Sep 24 01:36:20 2001 UTC vs.
Revision 1.128 by root, Wed Sep 19 21:39:15 2007 UTC