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

Comparing Coro/Coro.pm (file contents):
Revision 1.27 by root, Sat Jul 28 01:41:57 2001 UTC vs.
Revision 1.148 by root, Fri Oct 5 20:11:25 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;
		45	no warnings "uninitialized";
		46
37	use Coro::State;	47	use Coro::State;
38		48
39	use base Exporter;	49	use base qw(Coro::State Exporter);
40		50
41	$VERSION = 0.13;	51	our $idle; # idle handler
		52	our $main; # main coroutine
		53	our $current; # current coroutine
42		54
		55	our $VERSION = '4.01';
		56
43	@EXPORT = qw(async cede schedule terminate current);	57	our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub);
44	@EXPORT_OK = qw($current);	58	our %EXPORT_TAGS = (
		59	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],
		60	);
		61	our @EXPORT_OK = (@{$EXPORT_TAGS{prio}}, qw(nready));
45		62
46	{	63	{
47	my @async;	64	my @async;
48	my $init;	65	my $init;
49		66
50	# this way of handling attributes simply is NOT scalable ;()	67	# this way of handling attributes simply is NOT scalable ;()
51	sub import {	68	sub import {
		69	no strict 'refs';
		70
52	Coro->export_to_level(1, @_);	71	Coro->export_to_level (1, @_);
		72
53	my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};	73	my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};
54	*{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"} = sub {	74	*{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"} = sub {
55	my ($package, $ref) = (shift, shift);	75	my ($package, $ref) = (shift, shift);
56	my @attrs;	76	my @attrs;
57	for (@_) {	77	for (@_) {
…		…
72	};	92	};
73	}	93	}
74		94
75	}	95	}
76		96
		97	=over 4
		98
77	=item $main	99	=item $main
78		100
79	This coroutine represents the main program.	101	This coroutine represents the main program.
80		102
81	=cut	103	=cut
82		104
83	our $main = new Coro;	105	$main = new Coro;
84		106
85	=item $current (or as function: current)	107	=item $current (or as function: current)
86		108
87	The current coroutine (the last coroutine switched to). The initial value is C<$main> (of course).	109	The current coroutine (the last coroutine switched to). The initial value
		110	is C<$main> (of course).
88		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.
		115
89	=cut	116	=cut
		117
		118	$main->{desc} = "[main::]";
90		119
91	# maybe some other module used Coro::Specific before...	120	# maybe some other module used Coro::Specific before...
92	if ($current) {
93	$main->{specific} = $current->{specific};	121	$main->{_specific} = $current->{_specific}
94	}	122	if $current;
95		123
96	our $current = $main;	124	_set_current $main;
97		125
98	sub current() { $current }	126	sub current() { $current }
99		127
100	=item $idle	128	=item $idle
101		129
102	The coroutine to switch to when no other coroutine is running. The default	130	A callback that is called whenever the scheduler finds no ready coroutines
103	implementation prints "FATAL: deadlock detected" and exits.	131	to run. The default implementation prints "FATAL: deadlock detected" and
		132	exits, because the program has no other way to continue.
104		133
105	=cut	134	This hook is overwritten by modules such as C<Coro::Timer> and
		135	C<Coro::Event> to wait on an external event that hopefully wake up a
		136	coroutine so the scheduler can run it.
106		137
107	# should be done using priorities :(	138	Please note that if your callback recursively invokes perl (e.g. for event
108	our $idle = new Coro sub {	139	handlers), then it must be prepared to be called recursively.
109	print STDERR "FATAL: deadlock detected\n";	140
110	exit(51);	141	=cut
		142
		143	$idle = sub {
		144	require Carp;
		145	Carp::croak ("FATAL: deadlock detected");
111	};	146	};
		147
		148	sub _cancel {
		149	my ($self) = @_;
		150
		151	# free coroutine data and mark as destructed
		152	$self->_destroy
		153	or return;
		154
		155	# call all destruction callbacks
		156	$_->(@{$self->{_status}})
		157	for @{(delete $self->{_on_destroy}) \|\| []};
		158	}
112		159
113	# this coroutine is necessary because a coroutine	160	# this coroutine is necessary because a coroutine
114	# cannot destroy itself.	161	# cannot destroy itself.
115	my @destroy;	162	my @destroy;
		163	my $manager;
		164
116	my $manager = new Coro sub {	165	$manager = new Coro sub {
117	while() {	166	while () {
118	delete ((pop @destroy)->{_coro_state}) while @destroy;	167	(shift @destroy)->_cancel
		168	while @destroy;
		169
119	&schedule;	170	&schedule;
120	}	171	}
121	};	172	};
122		173	$manager->desc ("[coro manager]");
123	# we really need priorities...	174	$manager->prio (PRIO_MAX);
124	my @ready; # the ready queue. hehe, rather broken ;)
125		175
126	# static methods. not really.	176	# static methods. not really.
127		177
		178	=back
		179
128	=head2 STATIC METHODS	180	=head2 STATIC METHODS
129		181
130	Static methods are actually functions that operate on the current process only.	182	Static methods are actually functions that operate on the current coroutine only.
131		183
132	=over 4	184	=over 4
133		185
134	=item async { ... } [@args...]	186	=item async { ... } [@args...]
135		187
136	Create a new asynchronous process and return it's process object	188	Create a new asynchronous coroutine and return it's coroutine object
137	(usually unused). When the sub returns the new process is automatically	189	(usually unused). When the sub returns the new coroutine is automatically
138	terminated.	190	terminated.
		191
		192	See the C<Coro::State::new> constructor for info about the coroutine
		193	environment.
		194
		195	Calling C<exit> in a coroutine will do the same as calling exit outside
		196	the coroutine. Likewise, when the coroutine dies, the program will exit,
		197	just as it would in the main program.
139		198
140	# create a new coroutine that just prints its arguments	199	# create a new coroutine that just prints its arguments
141	async {	200	async {
142	print "@_\n";	201	print "@_\n";
143	} 1,2,3,4;	202	} 1,2,3,4;
144		203
145	The coderef you submit MUST NOT be a closure that refers to variables
146	in an outer scope. This does NOT work. Pass arguments into it instead.
147
148	=cut	204	=cut
149		205
150	sub async(&@) {	206	sub async(&@) {
151	my $pid = new Coro @_;	207	my $coro = new Coro @_;
152	$manager->ready; # this ensures that the stack is cloned from the manager
153	$pid->ready;	208	$coro->ready;
154	$pid;	209	$coro
		210	}
		211
		212	=item async_pool { ... } [@args...]
		213
		214	Similar to C<async>, but uses a coroutine pool, so you should not call
		215	terminate or join (although you are allowed to), and you get a coroutine
		216	that might have executed other code already (which can be good or bad :).
		217
		218	Also, the block is executed in an C<eval> context and a warning will be
		219	issued in case of an exception instead of terminating the program, as
		220	C<async> does. As the coroutine is being reused, stuff like C<on_destroy>
		221	will not work in the expected way, unless you call terminate or cancel,
		222	which somehow defeats the purpose of pooling.
		223
		224	The priority will be reset to C<0> after each job, tracing will be
		225	disabled, the description will be reset and the default output filehandle
		226	gets restored, so you can change alkl these. Otherwise the coroutine will
		227	be re-used "as-is": most notably if you change other per-coroutine global
		228	stuff such as C<$/> you need to revert that change, which is most simply
		229	done by using local as in C< local $/ >.
		230
		231	The pool size is limited to 8 idle coroutines (this can be adjusted by
		232	changing $Coro::POOL_SIZE), and there can be as many non-idle coros as
		233	required.
		234
		235	If you are concerned about pooled coroutines growing a lot because a
		236	single C<async_pool> used a lot of stackspace you can e.g. C<async_pool
		237	{ terminate }> once per second or so to slowly replenish the pool. In
		238	addition to that, when the stacks used by a handler grows larger than 16kb
		239	(adjustable with $Coro::POOL_RSS) it will also exit.
		240
		241	=cut
		242
		243	our $POOL_SIZE = 8;
		244	our $POOL_RSS = 16 * 1024;
		245	our @async_pool;
		246
		247	sub pool_handler {
		248	my $cb;
		249
		250	while () {
		251	eval {
		252	while () {
		253	_pool_1 $cb;
		254	&$cb;
		255	_pool_2 $cb;
		256	&schedule;
		257	}
		258	};
		259
		260	last if $@ eq "\3terminate\2\n";
		261	warn $@ if $@;
		262	}
		263	}
		264
		265	sub async_pool(&@) {
		266	# this is also inlined into the unlock_scheduler
		267	my $coro = (pop @async_pool) \|\| new Coro \&pool_handler;
		268
		269	$coro->{_invoke} = [@_];
		270	$coro->ready;
		271
		272	$coro
155	}	273	}
156		274
157	=item schedule	275	=item schedule
158		276
159	Calls the scheduler. Please note that the current process will not be put	277	Calls the scheduler. Please note that the current coroutine will not be put
160	into the ready queue, so calling this function usually means you will	278	into the ready queue, so calling this function usually means you will
161	never be called again.	279	never be called again unless something else (e.g. an event handler) calls
		280	ready.
162		281
163	=cut	282	The canonical way to wait on external events is this:
164		283
165	my $prev;	284	{
		285	# remember current coroutine
		286	my $current = $Coro::current;
166		287
167	sub schedule {	288	# register a hypothetical event handler
168	# should be done using priorities :(	289	on_event_invoke sub {
169	($prev, $current) = ($current, shift @ready \|\| $idle);	290	# wake up sleeping coroutine
170	Coro::State::transfer($prev, $current);	291	$current->ready;
171	}	292	undef $current;
		293	};
		294
		295	# call schedule until event occurred.
		296	# in case we are woken up for other reasons
		297	# (current still defined), loop.
		298	Coro::schedule while $current;
		299	}
172		300
173	=item cede	301	=item cede
174		302
175	"Cede" to other processes. This function puts the current process into the	303	"Cede" to other coroutines. This function puts the current coroutine into the
176	ready queue and calls C<schedule>, which has the effect of giving up the	304	ready queue and calls C<schedule>, which has the effect of giving up the
177	current "timeslice" to other coroutines of the same or higher priority.	305	current "timeslice" to other coroutines of the same or higher priority.
178		306
179	=cut	307	Returns true if at least one coroutine switch has happened.
180		308
181	sub cede {	309	=item Coro::cede_notself
182	$current->ready;
183	&schedule;
184	}
185		310
		311	Works like cede, but is not exported by default and will cede to any
		312	coroutine, regardless of priority, once.
		313
		314	Returns true if at least one coroutine switch has happened.
		315
186	=item terminate	316	=item terminate [arg...]
187		317
188	Terminates the current process.	318	Terminates the current coroutine with the given status values (see L<cancel>).
189		319
190	Future versions of this function will allow result arguments.	320	=item killall
		321
		322	Kills/terminates/cancels all coroutines except the currently running
		323	one. This is useful after a fork, either in the child or the parent, as
		324	usually only one of them should inherit the running coroutines.
191		325
192	=cut	326	=cut
193		327
194	sub terminate {	328	sub terminate {
195	push @destroy, $current;	329	$current->cancel (@_);
196	$manager->ready;	330	}
197	&schedule;	331
198	# NORETURN	332	sub killall {
		333	for (Coro::State::list) {
		334	$_->cancel
		335	if $_ != $current && UNIVERSAL::isa $_, "Coro";
		336	}
199	}	337	}
200		338
201	=back	339	=back
202		340
203	# dynamic methods	341	# dynamic methods
204		342
205	=head2 PROCESS METHODS	343	=head2 COROUTINE METHODS
206		344
207	These are the methods you can call on process objects.	345	These are the methods you can call on coroutine objects.
208		346
209	=over 4	347	=over 4
210		348
211	=item new Coro \&sub [, @args...]	349	=item new Coro \&sub [, @args...]
212		350
213	Create a new process and return it. When the sub returns the process	351	Create a new coroutine and return it. When the sub returns the coroutine
214	automatically terminates. To start the process you must first put it into	352	automatically terminates as if C<terminate> with the returned values were
		353	called. To make the coroutine run you must first put it into the ready queue
215	the ready queue by calling the ready method.	354	by calling the ready method.
216		355
217	The coderef you submit MUST NOT be a closure that refers to variables	356	See C<async> and C<Coro::State::new> for additional info about the
218	in an outer scope. This does NOT work. Pass arguments into it instead.	357	coroutine environment.
219		358
220	=cut	359	=cut
221		360
222	sub _newcoro {	361	sub _run_coro {
223	terminate &{+shift};	362	terminate &{+shift};
224	}	363	}
225		364
226	sub new {	365	sub new {
227	my $class = shift;	366	my $class = shift;
228	bless {
229	_coro_state => (new Coro::State $_[0] && \&_newcoro, @_),
230	}, $class;
231	}
232		367
233	=item $process->ready	368	$class->SUPER::new (\&_run_coro, @_)
		369	}
234		370
235	Put the current process into the ready queue.	371	=item $success = $coroutine->ready
236		372
237	=cut	373	Put the given coroutine into the ready queue (according to it's priority)
		374	and return true. If the coroutine is already in the ready queue, do nothing
		375	and return false.
238		376
239	sub ready {	377	=item $is_ready = $coroutine->is_ready
240	push @ready, $_[0];	378
		379	Return wether the coroutine is currently the ready queue or not,
		380
		381	=item $coroutine->cancel (arg...)
		382
		383	Terminates the given coroutine and makes it return the given arguments as
		384	status (default: the empty list). Never returns if the coroutine is the
		385	current coroutine.
		386
		387	=cut
		388
		389	sub cancel {
		390	my $self = shift;
		391	$self->{_status} = [@_];
		392
		393	if ($current == $self) {
		394	push @destroy, $self;
		395	$manager->ready;
		396	&schedule while 1;
		397	} else {
		398	$self->_cancel;
		399	}
		400	}
		401
		402	=item $coroutine->join
		403
		404	Wait until the coroutine terminates and return any values given to the
		405	C<terminate> or C<cancel> functions. C<join> can be called concurrently
		406	from multiple coroutines.
		407
		408	=cut
		409
		410	sub join {
		411	my $self = shift;
		412
		413	unless ($self->{_status}) {
		414	my $current = $current;
		415
		416	push @{$self->{_on_destroy}}, sub {
		417	$current->ready;
		418	undef $current;
		419	};
		420
		421	&schedule while $current;
		422	}
		423
		424	wantarray ? @{$self->{_status}} : $self->{_status}[0];
		425	}
		426
		427	=item $coroutine->on_destroy (\&cb)
		428
		429	Registers a callback that is called when this coroutine gets destroyed,
		430	but before it is joined. The callback gets passed the terminate arguments,
		431	if any.
		432
		433	=cut
		434
		435	sub on_destroy {
		436	my ($self, $cb) = @_;
		437
		438	push @{ $self->{_on_destroy} }, $cb;
		439	}
		440
		441	=item $oldprio = $coroutine->prio ($newprio)
		442
		443	Sets (or gets, if the argument is missing) the priority of the
		444	coroutine. Higher priority coroutines get run before lower priority
		445	coroutines. Priorities are small signed integers (currently -4 .. +3),
		446	that you can refer to using PRIO_xxx constants (use the import tag :prio
		447	to get then):
		448
		449	PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN
		450	3 > 1 > 0 > -1 > -3 > -4
		451
		452	# set priority to HIGH
		453	current->prio(PRIO_HIGH);
		454
		455	The idle coroutine ($Coro::idle) always has a lower priority than any
		456	existing coroutine.
		457
		458	Changing the priority of the current coroutine will take effect immediately,
		459	but changing the priority of coroutines in the ready queue (but not
		460	running) will only take effect after the next schedule (of that
		461	coroutine). This is a bug that will be fixed in some future version.
		462
		463	=item $newprio = $coroutine->nice ($change)
		464
		465	Similar to C<prio>, but subtract the given value from the priority (i.e.
		466	higher values mean lower priority, just as in unix).
		467
		468	=item $olddesc = $coroutine->desc ($newdesc)
		469
		470	Sets (or gets in case the argument is missing) the description for this
		471	coroutine. This is just a free-form string you can associate with a coroutine.
		472
		473	This method simply sets the C<< $coroutine->{desc} >> member to the given string. You
		474	can modify this member directly if you wish.
		475
		476	=cut
		477
		478	sub desc {
		479	my $old = $_[0]{desc};
		480	$_[0]{desc} = $_[1] if @_ > 1;
		481	$old;
241	}	482	}
242		483
243	=back	484	=back
244		485
		486	=head2 GLOBAL FUNCTIONS
		487
		488	=over 4
		489
		490	=item Coro::nready
		491
		492	Returns the number of coroutines that are currently in the ready state,
		493	i.e. that can be switched to. The value C<0> means that the only runnable
		494	coroutine is the currently running one, so C<cede> would have no effect,
		495	and C<schedule> would cause a deadlock unless there is an idle handler
		496	that wakes up some coroutines.
		497
		498	=item my $guard = Coro::guard { ... }
		499
		500	This creates and returns a guard object. Nothing happens until the object
		501	gets destroyed, in which case the codeblock given as argument will be
		502	executed. This is useful to free locks or other resources in case of a
		503	runtime error or when the coroutine gets canceled, as in both cases the
		504	guard block will be executed. The guard object supports only one method,
		505	C<< ->cancel >>, which will keep the codeblock from being executed.
		506
		507	Example: set some flag and clear it again when the coroutine gets canceled
		508	or the function returns:
		509
		510	sub do_something {
		511	my $guard = Coro::guard { $busy = 0 };
		512	$busy = 1;
		513
		514	# do something that requires $busy to be true
		515	}
		516
		517	=cut
		518
		519	sub guard(&) {
		520	bless \(my $cb = $_[0]), "Coro::guard"
		521	}
		522
		523	sub Coro::guard::cancel {
		524	${$_[0]} = sub { };
		525	}
		526
		527	sub Coro::guard::DESTROY {
		528	${$_[0]}->();
		529	}
		530
		531
		532	=item unblock_sub { ... }
		533
		534	This utility function takes a BLOCK or code reference and "unblocks" it,
		535	returning the new coderef. This means that the new coderef will return
		536	immediately without blocking, returning nothing, while the original code
		537	ref will be called (with parameters) from within its own coroutine.
		538
		539	The reason this function exists is that many event libraries (such as the
		540	venerable L<Event\|Event> module) are not coroutine-safe (a weaker form
		541	of thread-safety). This means you must not block within event callbacks,
		542	otherwise you might suffer from crashes or worse.
		543
		544	This function allows your callbacks to block by executing them in another
		545	coroutine where it is safe to block. One example where blocking is handy
		546	is when you use the L<Coro::AIO\|Coro::AIO> functions to save results to
		547	disk.
		548
		549	In short: simply use C<unblock_sub { ... }> instead of C<sub { ... }> when
		550	creating event callbacks that want to block.
		551
		552	=cut
		553
		554	our @unblock_queue;
		555
		556	# we create a special coro because we want to cede,
		557	# to reduce pressure on the coro pool (because most callbacks
		558	# return immediately and can be reused) and because we cannot cede
		559	# inside an event callback.
		560	our $unblock_scheduler = new Coro sub {
		561	while () {
		562	while (my $cb = pop @unblock_queue) {
		563	# this is an inlined copy of async_pool
		564	my $coro = (pop @async_pool) \|\| new Coro \&pool_handler;
		565
		566	$coro->{_invoke} = $cb;
		567	$coro->ready;
		568	cede; # for short-lived callbacks, this reduces pressure on the coro pool
		569	}
		570	schedule; # sleep well
		571	}
		572	};
		573	$unblock_scheduler->desc ("[unblock_sub scheduler]");
		574
		575	sub unblock_sub(&) {
		576	my $cb = shift;
		577
		578	sub {
		579	unshift @unblock_queue, [$cb, @_];
		580	$unblock_scheduler->ready;
		581	}
		582	}
		583
		584	=back
		585
245	=cut	586	=cut
246		587
247	1;	588	1;
248		589
249	=head1 BUGS/LIMITATIONS	590	=head1 BUGS/LIMITATIONS
250		591
251	- could be faster, especially when the core would introduce special	592	- you must make very sure that no coro is still active on global
252	support for coroutines (like it does for threads).	593	destruction. very bad things might happen otherwise (usually segfaults).
253	- there is still a memleak on coroutine termination that I could not	594
254	identify. Could be as small as a single SV.
255	- this module is not well-tested.
256	- if variables or arguments "disappear" (become undef) or become
257	corrupted please contact the author so he cen iron out the
258	remaining bugs.
259	- this module is not thread-safe. You must only ever use this module from	595	- this module is not thread-safe. You should only ever use this module
260	the same thread (this requirement might be loosened in the future to	596	from the same thread (this requirement might be loosened in the future
261	allow per-thread schedulers, but Coro::State does not yet allow this).	597	to allow per-thread schedulers, but Coro::State does not yet allow
		598	this).
262		599
263	=head1 SEE ALSO	600	=head1 SEE ALSO
264		601
265	L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,	602	Support/Utility: L<Coro::Specific>, L<Coro::State>, L<Coro::Util>.
266	L<Coro::Signal>, L<Coro::State>, L<Coro::Event>, L<Coro::RWLock>,	603
267	L<Coro::Handle>, L<Coro::Socket>.	604	Locking/IPC: L<Coro::Signal>, L<Coro::Channel>, L<Coro::Semaphore>, L<Coro::SemaphoreSet>, L<Coro::RWLock>.
		605
		606	Event/IO: L<Coro::Timer>, L<Coro::Event>, L<Coro::Handle>, L<Coro::Socket>, L<Coro::Select>.
		607
		608	Embedding: L<Coro:MakeMaker>
268		609
269	=head1 AUTHOR	610	=head1 AUTHOR
270		611
271	Marc Lehmann <pcg@goof.com>	612	Marc Lehmann <schmorp@schmorp.de>
272	http://www.goof.com/pcg/marc/	613	http://home.schmorp.de/
273		614
274	=cut	615	=cut
275		616

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Comparing Coro/Coro.pm (file contents): Revision 1.27 by root, Sat Jul 28 01:41:57 2001 UTC vs. Revision 1.148 by root, Fri Oct 5 20:11:25 2007 UTC

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Comparing Coro/Coro.pm (file contents):
Revision 1.27 by root, Sat Jul 28 01:41:57 2001 UTC vs.
Revision 1.148 by root, Fri Oct 5 20:11:25 2007 UTC