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

Comparing Coro/Coro.pm (file contents):
Revision 1.96 by root, Mon Dec 4 03:48:16 2006 UTC vs.
Revision 1.163 by root, Mon Dec 17 06:36:24 2007 UTC

…		…
6		6
7	use Coro;	7	use Coro;
8		8
9	async {	9	async {
10	# some asynchronous thread of execution	10	# some asynchronous thread of execution
		11	print "2\n";
		12	cede; # yield back to main
		13	print "4\n";
11	};	14	};
		15	print "1\n";
		16	cede; # yield to coroutine
		17	print "3\n";
		18	cede; # and again
12		19
13	# alternatively create an async coroutine like this:	20	# use locking
		21	my $lock = new Coro::Semaphore;
		22	my $locked;
14		23
15	sub some_func : Coro {	24	$lock->down;
16	# some more async code	25	$locked = 1;
17	}	26	$lock->up;
18
19	cede;
20		27
21	=head1 DESCRIPTION	28	=head1 DESCRIPTION
22		29
23	This module collection manages coroutines. Coroutines are similar to	30	This module collection manages coroutines. Coroutines are similar
24	threads but don't run in parallel.	31	to threads but don't run in parallel at the same time even on SMP
		32	machines. The specific flavor of coroutine used in this module also
		33	guarantees you that it will not switch between coroutines unless
		34	necessary, at easily-identified points in your program, so locking and
		35	parallel access are rarely an issue, making coroutine programming much
		36	safer than threads programming.
25		37
		38	(Perl, however, does not natively support real threads but instead does a
		39	very slow and memory-intensive emulation of processes using threads. This
		40	is a performance win on Windows machines, and a loss everywhere else).
		41
26	In this module, coroutines are defined as "callchain + lexical variables	42	In this module, coroutines are defined as "callchain + lexical variables +
27	+ @_ + $_ + $@ + $^W + C stack), that is, a coroutine has it's own	43	@_ + $_ + $@ + $/ + C stack), that is, a coroutine has its own callchain,
28	callchain, it's own set of lexicals and it's own set of perl's most	44	its own set of lexicals and its own set of perls most important global
29	important global variables.	45	variables (see L<Coro::State> for more configuration).
30		46
31	=cut	47	=cut
32		48
33	package Coro;	49	package Coro;
34		50
…		…
41		57
42	our $idle; # idle handler	58	our $idle; # idle handler
43	our $main; # main coroutine	59	our $main; # main coroutine
44	our $current; # current coroutine	60	our $current; # current coroutine
45		61
46	our $VERSION = '3.01';	62	our $VERSION = '4.32';
47		63
48	our @EXPORT = qw(async cede schedule terminate current unblock_sub);	64	our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub);
49	our %EXPORT_TAGS = (	65	our %EXPORT_TAGS = (
50	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],	66	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],
51	);	67	);
52	our @EXPORT_OK = @{$EXPORT_TAGS{prio}};	68	our @EXPORT_OK = (@{$EXPORT_TAGS{prio}}, qw(nready));
53		69
54	{	70	{
55	my @async;	71	my @async;
56	my $init;	72	my $init;
57		73
…		…
99		115
100	The current coroutine (the last coroutine switched to). The initial value	116	The current coroutine (the last coroutine switched to). The initial value
101	is C<$main> (of course).	117	is C<$main> (of course).
102		118
103	This variable is B<strictly> I<read-only>. It is provided for performance	119	This variable is B<strictly> I<read-only>. It is provided for performance
104	reasons. If performance is not essentiel you are encouraged to use the	120	reasons. If performance is not essential you are encouraged to use the
105	C<Coro::current> function instead.	121	C<Coro::current> function instead.
106		122
107	=cut	123	=cut
108		124
		125	$main->{desc} = "[main::]";
		126
109	# maybe some other module used Coro::Specific before...	127	# maybe some other module used Coro::Specific before...
110	$main->{specific} = $current->{specific}	128	$main->{_specific} = $current->{_specific}
111	if $current;	129	if $current;
112		130
113	_set_current $main;	131	_set_current $main;
114		132
115	sub current() { $current }	133	sub current() { $current }
…		…
123	This hook is overwritten by modules such as C<Coro::Timer> and	141	This hook is overwritten by modules such as C<Coro::Timer> and
124	C<Coro::Event> to wait on an external event that hopefully wake up a	142	C<Coro::Event> to wait on an external event that hopefully wake up a
125	coroutine so the scheduler can run it.	143	coroutine so the scheduler can run it.
126		144
127	Please note that if your callback recursively invokes perl (e.g. for event	145	Please note that if your callback recursively invokes perl (e.g. for event
128	handlers), then it must be prepared to be called recursively.	146	handlers), then it must be prepared to be called recursively itself.
129		147
130	=cut	148	=cut
131		149
132	$idle = sub {	150	$idle = sub {
133	require Carp;	151	require Carp;
134	Carp::croak ("FATAL: deadlock detected");	152	Carp::croak ("FATAL: deadlock detected");
135	};	153	};
136		154
		155	sub _cancel {
		156	my ($self) = @_;
		157
		158	# free coroutine data and mark as destructed
		159	$self->_destroy
		160	or return;
		161
		162	# call all destruction callbacks
		163	$_->(@{$self->{_status}})
		164	for @{(delete $self->{_on_destroy}) \|\| []};
		165	}
		166
137	# this coroutine is necessary because a coroutine	167	# this coroutine is necessary because a coroutine
138	# cannot destroy itself.	168	# cannot destroy itself.
139	my @destroy;	169	my @destroy;
		170	my $manager;
		171
140	my $manager; $manager = new Coro sub {	172	$manager = new Coro sub {
141	while () {	173	while () {
142	# by overwriting the state object with the manager we destroy it	174	(shift @destroy)->_cancel
143	# while still being able to schedule this coroutine (in case it has
144	# been readied multiple times. this is harmless since the manager
145	# can be called as many times as neccessary and will always
146	# remove itself from the runqueue
147	while (@destroy) {	175	while @destroy;
148	my $coro = pop @destroy;
149	$coro->{status} \|\|= [];
150	$_->ready for @{delete $coro->{join} \|\| []};
151		176
152	# the next line destroys the coro state, but keeps the
153	# coroutine itself intact (we basically make it a zombie
154	# coroutine that always runs the manager thread, so it's possible
155	# to transfer() to this coroutine).
156	$coro->_clone_state_from ($manager);
157	}
158	&schedule;	177	&schedule;
159	}	178	}
160	};	179	};
		180	$manager->desc ("[coro manager]");
		181	$manager->prio (PRIO_MAX);
161		182
162	# static methods. not really.	183	# static methods. not really.
163		184
164	=back	185	=back
165		186
…		…
173		194
174	Create a new asynchronous coroutine and return it's coroutine object	195	Create a new asynchronous coroutine and return it's coroutine object
175	(usually unused). When the sub returns the new coroutine is automatically	196	(usually unused). When the sub returns the new coroutine is automatically
176	terminated.	197	terminated.
177		198
178	Calling C<exit> in a coroutine will not work correctly, so do not do that.	199	See the C<Coro::State::new> constructor for info about the coroutine
		200	environment in which coroutines run.
179		201
180	When the coroutine dies, the program will exit, just as in the main	202	Calling C<exit> in a coroutine will do the same as calling exit outside
181	program.	203	the coroutine. Likewise, when the coroutine dies, the program will exit,
		204	just as it would in the main program.
182		205
183	# create a new coroutine that just prints its arguments	206	# create a new coroutine that just prints its arguments
184	async {	207	async {
185	print "@_\n";	208	print "@_\n";
186	} 1,2,3,4;	209	} 1,2,3,4;
187		210
188	=cut	211	=cut
189		212
190	sub async(&@) {	213	sub async(&@) {
191	my $pid = new Coro @_;	214	my $coro = new Coro @_;
192	$pid->ready;	215	$coro->ready;
193	$pid	216	$coro
		217	}
		218
		219	=item async_pool { ... } [@args...]
		220
		221	Similar to C<async>, but uses a coroutine pool, so you should not call
		222	terminate or join (although you are allowed to), and you get a coroutine
		223	that might have executed other code already (which can be good or bad :).
		224
		225	Also, the block is executed in an C<eval> context and a warning will be
		226	issued in case of an exception instead of terminating the program, as
		227	C<async> does. As the coroutine is being reused, stuff like C<on_destroy>
		228	will not work in the expected way, unless you call terminate or cancel,
		229	which somehow defeats the purpose of pooling.
		230
		231	The priority will be reset to C<0> after each job, tracing will be
		232	disabled, the description will be reset and the default output filehandle
		233	gets restored, so you can change alkl these. Otherwise the coroutine will
		234	be re-used "as-is": most notably if you change other per-coroutine global
		235	stuff such as C<$/> you need to revert that change, which is most simply
		236	done by using local as in C< local $/ >.
		237
		238	The pool size is limited to 8 idle coroutines (this can be adjusted by
		239	changing $Coro::POOL_SIZE), and there can be as many non-idle coros as
		240	required.
		241
		242	If you are concerned about pooled coroutines growing a lot because a
		243	single C<async_pool> used a lot of stackspace you can e.g. C<async_pool
		244	{ terminate }> once per second or so to slowly replenish the pool. In
		245	addition to that, when the stacks used by a handler grows larger than 16kb
		246	(adjustable with $Coro::POOL_RSS) it will also exit.
		247
		248	=cut
		249
		250	our $POOL_SIZE = 8;
		251	our $POOL_RSS = 16 * 1024;
		252	our @async_pool;
		253
		254	sub pool_handler {
		255	my $cb;
		256
		257	while () {
		258	eval {
		259	while () {
		260	_pool_1 $cb;
		261	&$cb;
		262	_pool_2 $cb;
		263	&schedule;
		264	}
		265	};
		266
		267	last if $@ eq "\3async_pool terminate\2\n";
		268	warn $@ if $@;
		269	}
		270	}
		271
		272	sub async_pool(&@) {
		273	# this is also inlined into the unlock_scheduler
		274	my $coro = (pop @async_pool) \|\| new Coro \&pool_handler;
		275
		276	$coro->{_invoke} = [@_];
		277	$coro->ready;
		278
		279	$coro
194	}	280	}
195		281
196	=item schedule	282	=item schedule
197		283
198	Calls the scheduler. Please note that the current coroutine will not be put	284	Calls the scheduler. Please note that the current coroutine will not be put
…		…
211	# wake up sleeping coroutine	297	# wake up sleeping coroutine
212	$current->ready;	298	$current->ready;
213	undef $current;	299	undef $current;
214	};	300	};
215		301
216	# call schedule until event occured.	302	# call schedule until event occurred.
217	# in case we are woken up for other reasons	303	# in case we are woken up for other reasons
218	# (current still defined), loop.	304	# (current still defined), loop.
219	Coro::schedule while $current;	305	Coro::schedule while $current;
220	}	306	}
221		307
…		…
223		309
224	"Cede" to other coroutines. This function puts the current coroutine into the	310	"Cede" to other coroutines. This function puts the current coroutine into the
225	ready queue and calls C<schedule>, which has the effect of giving up the	311	ready queue and calls C<schedule>, which has the effect of giving up the
226	current "timeslice" to other coroutines of the same or higher priority.	312	current "timeslice" to other coroutines of the same or higher priority.
227		313
		314	=item Coro::cede_notself
		315
		316	Works like cede, but is not exported by default and will cede to any
		317	coroutine, regardless of priority, once.
		318
228	=item terminate [arg...]	319	=item terminate [arg...]
229		320
230	Terminates the current coroutine with the given status values (see L<cancel>).	321	Terminates the current coroutine with the given status values (see L<cancel>).
		322
		323	=item killall
		324
		325	Kills/terminates/cancels all coroutines except the currently running
		326	one. This is useful after a fork, either in the child or the parent, as
		327	usually only one of them should inherit the running coroutines.
231		328
232	=cut	329	=cut
233		330
234	sub terminate {	331	sub terminate {
235	$current->cancel (@_);	332	$current->cancel (@_);
		333	}
		334
		335	sub killall {
		336	for (Coro::State::list) {
		337	$_->cancel
		338	if $_ != $current && UNIVERSAL::isa $_, "Coro";
		339	}
236	}	340	}
237		341
238	=back	342	=back
239		343
240	# dynamic methods	344	# dynamic methods
…		…
250	Create a new coroutine and return it. When the sub returns the coroutine	354	Create a new coroutine and return it. When the sub returns the coroutine
251	automatically terminates as if C<terminate> with the returned values were	355	automatically terminates as if C<terminate> with the returned values were
252	called. To make the coroutine run you must first put it into the ready queue	356	called. To make the coroutine run you must first put it into the ready queue
253	by calling the ready method.	357	by calling the ready method.
254		358
255	Calling C<exit> in a coroutine will not work correctly, so do not do that.	359	See C<async> and C<Coro::State::new> for additional info about the
		360	coroutine environment.
256		361
257	=cut	362	=cut
258		363
259	sub _run_coro {	364	sub _run_coro {
260	terminate &{+shift};	365	terminate &{+shift};
…		…
277	Return wether the coroutine is currently the ready queue or not,	382	Return wether the coroutine is currently the ready queue or not,
278		383
279	=item $coroutine->cancel (arg...)	384	=item $coroutine->cancel (arg...)
280		385
281	Terminates the given coroutine and makes it return the given arguments as	386	Terminates the given coroutine and makes it return the given arguments as
282	status (default: the empty list).	387	status (default: the empty list). Never returns if the coroutine is the
		388	current coroutine.
283		389
284	=cut	390	=cut
285		391
286	sub cancel {	392	sub cancel {
287	my $self = shift;	393	my $self = shift;
288	$self->{status} = [@_];	394	$self->{_status} = [@_];
		395
		396	if ($current == $self) {
289	push @destroy, $self;	397	push @destroy, $self;
290	$manager->ready;	398	$manager->ready;
291	&schedule if $current == $self;	399	&schedule while 1;
		400	} else {
		401	$self->_cancel;
		402	}
292	}	403	}
293		404
294	=item $coroutine->join	405	=item $coroutine->join
295		406
296	Wait until the coroutine terminates and return any values given to the	407	Wait until the coroutine terminates and return any values given to the
297	C<terminate> or C<cancel> functions. C<join> can be called multiple times	408	C<terminate> or C<cancel> functions. C<join> can be called concurrently
298	from multiple coroutine.	409	from multiple coroutines.
299		410
300	=cut	411	=cut
301		412
302	sub join {	413	sub join {
303	my $self = shift;	414	my $self = shift;
		415
304	unless ($self->{status}) {	416	unless ($self->{_status}) {
305	push @{$self->{join}}, $current;	417	my $current = $current;
306	&schedule;	418
		419	push @{$self->{_on_destroy}}, sub {
		420	$current->ready;
		421	undef $current;
		422	};
		423
		424	&schedule while $current;
307	}	425	}
		426
308	wantarray ? @{$self->{status}} : $self->{status}[0];	427	wantarray ? @{$self->{_status}} : $self->{_status}[0];
		428	}
		429
		430	=item $coroutine->on_destroy (\&cb)
		431
		432	Registers a callback that is called when this coroutine gets destroyed,
		433	but before it is joined. The callback gets passed the terminate arguments,
		434	if any.
		435
		436	=cut
		437
		438	sub on_destroy {
		439	my ($self, $cb) = @_;
		440
		441	push @{ $self->{_on_destroy} }, $cb;
309	}	442	}
310		443
311	=item $oldprio = $coroutine->prio ($newprio)	444	=item $oldprio = $coroutine->prio ($newprio)
312		445
313	Sets (or gets, if the argument is missing) the priority of the	446	Sets (or gets, if the argument is missing) the priority of the
…		…
338	=item $olddesc = $coroutine->desc ($newdesc)	471	=item $olddesc = $coroutine->desc ($newdesc)
339		472
340	Sets (or gets in case the argument is missing) the description for this	473	Sets (or gets in case the argument is missing) the description for this
341	coroutine. This is just a free-form string you can associate with a coroutine.	474	coroutine. This is just a free-form string you can associate with a coroutine.
342		475
		476	This method simply sets the C<< $coroutine->{desc} >> member to the given string. You
		477	can modify this member directly if you wish.
		478
		479	=item $coroutine->throw ([$scalar])
		480
		481	If C<$throw> is specified and defined, it will be thrown as an exception
		482	inside the coroutine at the next convinient point in time (usually after
		483	it gains control at the next schedule/transfer/cede). Otherwise clears the
		484	exception object.
		485
		486	The exception object will be thrown "as is" with the specified scalar in
		487	C<$@>, i.e. if it is a string, no line number or newline will be appended
		488	(unlike with C<die>).
		489
		490	This can be used as a softer means than C<cancel> to ask a coroutine to
		491	end itself, although there is no guarentee that the exception will lead to
		492	termination, and if the exception isn't caught it might well end the whole
		493	program.
		494
343	=cut	495	=cut
344		496
345	sub desc {	497	sub desc {
346	my $old = $_[0]{desc};	498	my $old = $_[0]{desc};
347	$_[0]{desc} = $_[1] if @_ > 1;	499	$_[0]{desc} = $_[1] if @_ > 1;
348	$old;	500	$old;
349	}	501	}
350		502
351	=back	503	=back
352		504
353	=head2 UTILITY FUNCTIONS	505	=head2 GLOBAL FUNCTIONS
354		506
355	=over 4	507	=over 4
		508
		509	=item Coro::nready
		510
		511	Returns the number of coroutines that are currently in the ready state,
		512	i.e. that can be switched to. The value C<0> means that the only runnable
		513	coroutine is the currently running one, so C<cede> would have no effect,
		514	and C<schedule> would cause a deadlock unless there is an idle handler
		515	that wakes up some coroutines.
		516
		517	=item my $guard = Coro::guard { ... }
		518
		519	This creates and returns a guard object. Nothing happens until the object
		520	gets destroyed, in which case the codeblock given as argument will be
		521	executed. This is useful to free locks or other resources in case of a
		522	runtime error or when the coroutine gets canceled, as in both cases the
		523	guard block will be executed. The guard object supports only one method,
		524	C<< ->cancel >>, which will keep the codeblock from being executed.
		525
		526	Example: set some flag and clear it again when the coroutine gets canceled
		527	or the function returns:
		528
		529	sub do_something {
		530	my $guard = Coro::guard { $busy = 0 };
		531	$busy = 1;
		532
		533	# do something that requires $busy to be true
		534	}
		535
		536	=cut
		537
		538	sub guard(&) {
		539	bless \(my $cb = $_[0]), "Coro::guard"
		540	}
		541
		542	sub Coro::guard::cancel {
		543	${$_[0]} = sub { };
		544	}
		545
		546	sub Coro::guard::DESTROY {
		547	${$_[0]}->();
		548	}
		549
356		550
357	=item unblock_sub { ... }	551	=item unblock_sub { ... }
358		552
359	This utility function takes a BLOCK or code reference and "unblocks" it,	553	This utility function takes a BLOCK or code reference and "unblocks" it,
360	returning the new coderef. This means that the new coderef will return	554	returning the new coderef. This means that the new coderef will return
361	immediately without blocking, returning nothing, while the original code	555	immediately without blocking, returning nothing, while the original code
362	ref will be called (with parameters) from within its own coroutine.	556	ref will be called (with parameters) from within its own coroutine.
363		557
364	The reason this fucntion exists is that many event libraries (such as the	558	The reason this function exists is that many event libraries (such as the
365	venerable L<Event\|Event> module) are not coroutine-safe (a weaker form	559	venerable L<Event\|Event> module) are not coroutine-safe (a weaker form
366	of thread-safety). This means you must not block within event callbacks,	560	of thread-safety). This means you must not block within event callbacks,
367	otherwise you might suffer from crashes or worse.	561	otherwise you might suffer from crashes or worse.
368		562
369	This function allows your callbacks to block by executing them in another	563	This function allows your callbacks to block by executing them in another
…		…
374	In short: simply use C<unblock_sub { ... }> instead of C<sub { ... }> when	568	In short: simply use C<unblock_sub { ... }> instead of C<sub { ... }> when
375	creating event callbacks that want to block.	569	creating event callbacks that want to block.
376		570
377	=cut	571	=cut
378		572
379	our @unblock_pool;
380	our @unblock_queue;	573	our @unblock_queue;
381	our $UNBLOCK_POOL_SIZE = 2;
382		574
383	sub unblock_handler_ {	575	# we create a special coro because we want to cede,
384	while () {	576	# to reduce pressure on the coro pool (because most callbacks
385	my ($cb, @arg) = @{ delete $Coro::current->{arg} };	577	# return immediately and can be reused) and because we cannot cede
386	$cb->(@arg);	578	# inside an event callback.
387
388	last if @unblock_pool >= $UNBLOCK_POOL_SIZE;
389	push @unblock_pool, $Coro::current;
390	schedule;
391	}
392	}
393
394	our $unblock_scheduler = async {	579	our $unblock_scheduler = new Coro sub {
395	while () {	580	while () {
396	while (my $cb = pop @unblock_queue) {	581	while (my $cb = pop @unblock_queue) {
397	my $handler = (pop @unblock_pool or new Coro \&unblock_handler_);	582	# this is an inlined copy of async_pool
398	$handler->{arg} = $cb;	583	my $coro = (pop @async_pool) \|\| new Coro \&pool_handler;
		584
		585	$coro->{_invoke} = $cb;
399	$handler->ready;	586	$coro->ready;
400	cede;	587	cede; # for short-lived callbacks, this reduces pressure on the coro pool
401	}	588	}
402		589	schedule; # sleep well
403	schedule;
404	}	590	}
405	};	591	};
		592	$unblock_scheduler->desc ("[unblock_sub scheduler]");
406		593
407	sub unblock_sub(&) {	594	sub unblock_sub(&) {
408	my $cb = shift;	595	my $cb = shift;
409		596
410	sub {	597	sub {
411	push @unblock_queue, [$cb, @_];	598	unshift @unblock_queue, [$cb, @_];
412	$unblock_scheduler->ready;	599	$unblock_scheduler->ready;
413	}	600	}
414	}	601	}
415		602
416	=back	603	=back
…		…
423		610
424	- you must make very sure that no coro is still active on global	611	- you must make very sure that no coro is still active on global
425	destruction. very bad things might happen otherwise (usually segfaults).	612	destruction. very bad things might happen otherwise (usually segfaults).
426		613
427	- this module is not thread-safe. You should only ever use this module	614	- this module is not thread-safe. You should only ever use this module
428	from the same thread (this requirement might be losened in the future	615	from the same thread (this requirement might be loosened in the future
429	to allow per-thread schedulers, but Coro::State does not yet allow	616	to allow per-thread schedulers, but Coro::State does not yet allow
430	this).	617	this).
431		618
432	=head1 SEE ALSO	619	=head1 SEE ALSO
433		620
		621	Lower level Configuration, Coroutine Environment: L<Coro::State>.
		622
		623	Debugging: L<Coro::Debug>.
		624
434	Support/Utility: L<Coro::Cont>, L<Coro::Specific>, L<Coro::State>, L<Coro::Util>.	625	Support/Utility: L<Coro::Specific>, L<Coro::Util>.
435		626
436	Locking/IPC: L<Coro::Signal>, L<Coro::Channel>, L<Coro::Semaphore>, L<Coro::SemaphoreSet>, L<Coro::RWLock>.	627	Locking/IPC: L<Coro::Signal>, L<Coro::Channel>, L<Coro::Semaphore>, L<Coro::SemaphoreSet>, L<Coro::RWLock>.
437		628
438	Event/IO: L<Coro::Timer>, L<Coro::Event>, L<Coro::Handle>, L<Coro::Socket>, L<Coro::Select>.	629	Event/IO: L<Coro::Timer>, L<Coro::Event>, L<Coro::Handle>, L<Coro::Socket>.
439		630
		631	Compatibility: L<Coro::LWP>, L<Coro::Storable>, L<Coro::Select>.
		632
440	Embedding: L<Coro:MakeMaker>	633	Embedding: L<Coro::MakeMaker>.
441		634
442	=head1 AUTHOR	635	=head1 AUTHOR
443		636
444	Marc Lehmann <schmorp@schmorp.de>	637	Marc Lehmann <schmorp@schmorp.de>
445	http://home.schmorp.de/	638	http://home.schmorp.de/

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Comparing Coro/Coro.pm (file contents): Revision 1.96 by root, Mon Dec 4 03:48:16 2006 UTC vs. Revision 1.163 by root, Mon Dec 17 06:36:24 2007 UTC

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Comparing Coro/Coro.pm (file contents):
Revision 1.96 by root, Mon Dec 4 03:48:16 2006 UTC vs.
Revision 1.163 by root, Mon Dec 17 06:36:24 2007 UTC