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

Comparing Coro/Coro.pm (file contents):
Revision 1.83 by root, Fri Nov 24 15:34:33 2006 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
		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).
		34
26	In this module, coroutines are defined as "callchain + lexical variables	35	In this module, coroutines are defined as "callchain + lexical variables +
27	+ @_ + $_ + $@ + $^W + C stack), that is, a coroutine has it's own	36	@_ + $_ + $@ + $/ + 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	37	its own set of lexicals and its own set of perls most important global
29	important global variables.	38	variables.
30		39
31	=cut	40	=cut
32		41
33	package Coro;	42	package Coro;
34		43
…		…
41		50
42	our $idle; # idle handler	51	our $idle; # idle handler
43	our $main; # main coroutine	52	our $main; # main coroutine
44	our $current; # current coroutine	53	our $current; # current coroutine
45		54
46	our $VERSION = '2.5';	55	our $VERSION = '4.01';
47		56
48	our @EXPORT = qw(async cede schedule terminate current);	57	our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub);
49	our %EXPORT_TAGS = (	58	our %EXPORT_TAGS = (
50	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],	59	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],
51	);	60	);
52	our @EXPORT_OK = @{$EXPORT_TAGS{prio}};	61	our @EXPORT_OK = (@{$EXPORT_TAGS{prio}}, qw(nready));
53		62
54	{	63	{
55	my @async;	64	my @async;
56	my $init;	65	my $init;
57		66
58	# this way of handling attributes simply is NOT scalable ;()	67	# this way of handling attributes simply is NOT scalable ;()
59	sub import {	68	sub import {
60	no strict 'refs';	69	no strict 'refs';
61		70
62	Coro->export_to_level(1, @_);	71	Coro->export_to_level (1, @_);
63		72
64	my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};	73	my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};
65	*{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"} = sub {	74	*{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"} = sub {
66	my ($package, $ref) = (shift, shift);	75	my ($package, $ref) = (shift, shift);
67	my @attrs;	76	my @attrs;
…		…
99		108
100	The current coroutine (the last coroutine switched to). The initial value	109	The current coroutine (the last coroutine switched to). The initial value
101	is C<$main> (of course).	110	is C<$main> (of course).
102		111
103	This variable is B<strictly> I<read-only>. It is provided for performance	112	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	113	reasons. If performance is not essential you are encouraged to use the
105	C<Coro::current> function instead.	114	C<Coro::current> function instead.
106		115
107	=cut	116	=cut
108		117
		118	$main->{desc} = "[main::]";
		119
109	# maybe some other module used Coro::Specific before...	120	# maybe some other module used Coro::Specific before...
110	if ($current) {
111	$main->{specific} = $current->{specific};	121	$main->{_specific} = $current->{_specific}
112	}	122	if $current;
113		123
114	$current = $main;	124	_set_current $main;
115		125
116	sub current() { $current }	126	sub current() { $current }
117		127
118	=item $idle	128	=item $idle
119		129
120	A callback that is called whenever the scheduler finds no ready coroutines	130	A callback that is called whenever the scheduler finds no ready coroutines
121	to run. The default implementation prints "FATAL: deadlock detected" and	131	to run. The default implementation prints "FATAL: deadlock detected" and
122	exits.	132	exits, because the program has no other way to continue.
123		133
124	This hook is overwritten by modules such as C<Coro::Timer> and	134	This hook is overwritten by modules such as C<Coro::Timer> and
125	C<Coro::Event> to wait on an external event that hopefully wakes up some	135	C<Coro::Event> to wait on an external event that hopefully wake up a
126	coroutine.	136	coroutine so the scheduler can run it.
		137
		138	Please note that if your callback recursively invokes perl (e.g. for event
		139	handlers), then it must be prepared to be called recursively.
127		140
128	=cut	141	=cut
129		142
130	$idle = sub {	143	$idle = sub {
131	print STDERR "FATAL: deadlock detected\n";	144	require Carp;
132	exit (51);	145	Carp::croak ("FATAL: deadlock detected");
133	};	146	};
		147
		148	sub _cancel {
		149	my ($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	}
134		159
135	# this coroutine is necessary because a coroutine	160	# this coroutine is necessary because a coroutine
136	# cannot destroy itself.	161	# cannot destroy itself.
137	my @destroy;	162	my @destroy;
138	my $manager;	163	my $manager;
		164
139	$manager = new Coro sub {	165	$manager = new Coro sub {
140	while () {	166	while () {
141	# by overwriting the state object with the manager we destroy it	167	(shift @destroy)->_cancel
142	# while still being able to schedule this coroutine (in case it has
143	# been readied multiple times. this is harmless since the manager
144	# can be called as many times as neccessary and will always
145	# remove itself from the runqueue
146	while (@destroy) {	168	while @destroy;
147	my $coro = pop @destroy;
148	$coro->{status} \|\|= [];
149	$_->ready for @{delete $coro->{join} \|\| []};
150		169
151	# the next line destroys the coro state, but keeps the
152	# process itself intact (we basically make it a zombie
153	# process that always runs the manager thread, so it's possible
154	# to transfer() to this process).
155	$coro->_clone_state_from ($manager);
156	}
157	&schedule;	170	&schedule;
158	}	171	}
159	};	172	};
		173	$manager->desc ("[coro manager]");
		174	$manager->prio (PRIO_MAX);
160		175
161	# static methods. not really.	176	# static methods. not really.
162		177
163	=back	178	=back
164		179
165	=head2 STATIC METHODS	180	=head2 STATIC METHODS
166		181
167	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.
168		183
169	=over 4	184	=over 4
170		185
171	=item async { ... } [@args...]	186	=item async { ... } [@args...]
172		187
173	Create a new asynchronous process and return it's process object	188	Create a new asynchronous coroutine and return it's coroutine object
174	(usually unused). When the sub returns the new process is automatically	189	(usually unused). When the sub returns the new coroutine is automatically
175	terminated.	190	terminated.
176		191
177	When the coroutine dies, the program will exit, just as in the main	192	See the C<Coro::State::new> constructor for info about the coroutine
178	program.	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.
179		198
180	# create a new coroutine that just prints its arguments	199	# create a new coroutine that just prints its arguments
181	async {	200	async {
182	print "@_\n";	201	print "@_\n";
183	} 1,2,3,4;	202	} 1,2,3,4;
184		203
185	=cut	204	=cut
186		205
187	sub async(&@) {	206	sub async(&@) {
188	my $pid = new Coro @_;	207	my $coro = new Coro @_;
189	$manager->ready; # this ensures that the stack is cloned from the manager
190	$pid->ready;	208	$coro->ready;
191	$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
192	}	273	}
193		274
194	=item schedule	275	=item schedule
195		276
196	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
197	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
198	never be called again.	279	never be called again unless something else (e.g. an event handler) calls
		280	ready.
199		281
200	=cut	282	The canonical way to wait on external events is this:
		283
		284	{
		285	# remember current coroutine
		286	my $current = $Coro::current;
		287
		288	# register a hypothetical event handler
		289	on_event_invoke sub {
		290	# wake up sleeping coroutine
		291	$current->ready;
		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	}
201		300
202	=item cede	301	=item cede
203		302
204	"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
205	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
206	current "timeslice" to other coroutines of the same or higher priority.	305	current "timeslice" to other coroutines of the same or higher priority.
207		306
208	=cut	307	Returns true if at least one coroutine switch has happened.
		308
		309	=item Coro::cede_notself
		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.
209		315
210	=item terminate [arg...]	316	=item terminate [arg...]
211		317
212	Terminates the current process with the given status values (see L<cancel>).	318	Terminates the current coroutine with the given status values (see L<cancel>).
		319
		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.
213		325
214	=cut	326	=cut
215		327
216	sub terminate {	328	sub terminate {
217	$current->cancel (@_);	329	$current->cancel (@_);
218	}	330	}
219		331
		332	sub killall {
		333	for (Coro::State::list) {
		334	$_->cancel
		335	if $_ != $current && UNIVERSAL::isa $_, "Coro";
		336	}
		337	}
		338
220	=back	339	=back
221		340
222	# dynamic methods	341	# dynamic methods
223		342
224	=head2 PROCESS METHODS	343	=head2 COROUTINE METHODS
225		344
226	These are the methods you can call on process objects.	345	These are the methods you can call on coroutine objects.
227		346
228	=over 4	347	=over 4
229		348
230	=item new Coro \&sub [, @args...]	349	=item new Coro \&sub [, @args...]
231		350
232	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
233	automatically terminates as if C<terminate> with the returned values were	352	automatically terminates as if C<terminate> with the returned values were
234	called. To make the process run you must first put it into the ready queue	353	called. To make the coroutine run you must first put it into the ready queue
235	by calling the ready method.	354	by calling the ready method.
236		355
237	=cut	356	See C<async> and C<Coro::State::new> for additional info about the
		357	coroutine environment.
238		358
		359	=cut
		360
239	sub _newcoro {	361	sub _run_coro {
240	terminate &{+shift};	362	terminate &{+shift};
241	}	363	}
242		364
243	sub new {	365	sub new {
244	my $class = shift;	366	my $class = shift;
245		367
246	$class->SUPER::new (\&_newcoro, @_)	368	$class->SUPER::new (\&_run_coro, @_)
247	}	369	}
248		370
249	=item $process->ready	371	=item $success = $coroutine->ready
250		372
251	Put the given process into the ready queue.	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.
252		376
253	=cut	377	=item $is_ready = $coroutine->is_ready
254		378
		379	Return wether the coroutine is currently the ready queue or not,
		380
255	=item $process->cancel (arg...)	381	=item $coroutine->cancel (arg...)
256		382
257	Terminates the given process and makes it return the given arguments as	383	Terminates the given coroutine and makes it return the given arguments as
258	status (default: the empty list).	384	status (default: the empty list). Never returns if the coroutine is the
		385	current coroutine.
259		386
260	=cut	387	=cut
261		388
262	sub cancel {	389	sub cancel {
263	my $self = shift;	390	my $self = shift;
264	$self->{status} = [@_];	391	$self->{_status} = [@_];
		392
		393	if ($current == $self) {
265	push @destroy, $self;	394	push @destroy, $self;
266	$manager->ready;	395	$manager->ready;
267	&schedule if $current == $self;	396	&schedule while 1;
		397	} else {
		398	$self->_cancel;
		399	}
268	}	400	}
269		401
270	=item $process->join	402	=item $coroutine->join
271		403
272	Wait until the coroutine terminates and return any values given to the	404	Wait until the coroutine terminates and return any values given to the
273	C<terminate> or C<cancel> functions. C<join> can be called multiple times	405	C<terminate> or C<cancel> functions. C<join> can be called concurrently
274	from multiple processes.	406	from multiple coroutines.
275		407
276	=cut	408	=cut
277		409
278	sub join {	410	sub join {
279	my $self = shift;	411	my $self = shift;
		412
280	unless ($self->{status}) {	413	unless ($self->{_status}) {
281	push @{$self->{join}}, $current;	414	my $current = $current;
282	&schedule;	415
		416	push @{$self->{_on_destroy}}, sub {
		417	$current->ready;
		418	undef $current;
		419	};
		420
		421	&schedule while $current;
283	}	422	}
		423
284	wantarray ? @{$self->{status}} : $self->{status}[0];	424	wantarray ? @{$self->{_status}} : $self->{_status}[0];
285	}	425	}
286		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
287	=item $oldprio = $process->prio ($newprio)	441	=item $oldprio = $coroutine->prio ($newprio)
288		442
289	Sets (or gets, if the argument is missing) the priority of the	443	Sets (or gets, if the argument is missing) the priority of the
290	process. Higher priority processes get run before lower priority	444	coroutine. Higher priority coroutines get run before lower priority
291	processes. Priorities are small signed integers (currently -4 .. +3),	445	coroutines. Priorities are small signed integers (currently -4 .. +3),
292	that you can refer to using PRIO_xxx constants (use the import tag :prio	446	that you can refer to using PRIO_xxx constants (use the import tag :prio
293	to get then):	447	to get then):
294		448
295	PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN	449	PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN
296	3 > 1 > 0 > -1 > -3 > -4	450	3 > 1 > 0 > -1 > -3 > -4
…		…
299	current->prio(PRIO_HIGH);	453	current->prio(PRIO_HIGH);
300		454
301	The idle coroutine ($Coro::idle) always has a lower priority than any	455	The idle coroutine ($Coro::idle) always has a lower priority than any
302	existing coroutine.	456	existing coroutine.
303		457
304	Changing the priority of the current process will take effect immediately,	458	Changing the priority of the current coroutine will take effect immediately,
305	but changing the priority of processes in the ready queue (but not	459	but changing the priority of coroutines in the ready queue (but not
306	running) will only take effect after the next schedule (of that	460	running) will only take effect after the next schedule (of that
307	process). This is a bug that will be fixed in some future version.	461	coroutine). This is a bug that will be fixed in some future version.
308		462
309	=item $newprio = $process->nice ($change)	463	=item $newprio = $coroutine->nice ($change)
310		464
311	Similar to C<prio>, but subtract the given value from the priority (i.e.	465	Similar to C<prio>, but subtract the given value from the priority (i.e.
312	higher values mean lower priority, just as in unix).	466	higher values mean lower priority, just as in unix).
313		467
314	=item $olddesc = $process->desc ($newdesc)	468	=item $olddesc = $coroutine->desc ($newdesc)
315		469
316	Sets (or gets in case the argument is missing) the description for this	470	Sets (or gets in case the argument is missing) the description for this
317	process. This is just a free-form string you can associate with a process.	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.
318		475
319	=cut	476	=cut
320		477
321	sub desc {	478	sub desc {
322	my $old = $_[0]{desc};	479	my $old = $_[0]{desc};
…		…
324	$old;	481	$old;
325	}	482	}
326		483
327	=back	484	=back
328		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
329	=cut	586	=cut
330		587
331	1;	588	1;
332		589
333	=head1 BUGS/LIMITATIONS	590	=head1 BUGS/LIMITATIONS
334		591
335	- you must make very sure that no coro is still active on global	592	- you must make very sure that no coro is still active on global
336	destruction. very bad things might happen otherwise (usually segfaults).	593	destruction. very bad things might happen otherwise (usually segfaults).
337		594
338	- this module is not thread-safe. You should only ever use this module	595	- this module is not thread-safe. You should only ever use this module
339	from the same thread (this requirement might be losened in the future	596	from the same thread (this requirement might be loosened in the future
340	to allow per-thread schedulers, but Coro::State does not yet allow	597	to allow per-thread schedulers, but Coro::State does not yet allow
341	this).	598	this).
342		599
343	=head1 SEE ALSO	600	=head1 SEE ALSO
344		601
345	Support/Utility: L<Coro::Cont>, L<Coro::Specific>, L<Coro::State>, L<Coro::Util>.	602	Support/Utility: L<Coro::Specific>, L<Coro::State>, L<Coro::Util>.
346		603
347	Locking/IPC: L<Coro::Signal>, L<Coro::Channel>, L<Coro::Semaphore>, L<Coro::SemaphoreSet>, L<Coro::RWLock>.	604	Locking/IPC: L<Coro::Signal>, L<Coro::Channel>, L<Coro::Semaphore>, L<Coro::SemaphoreSet>, L<Coro::RWLock>.
348		605
349	Event/IO: L<Coro::Timer>, L<Coro::Event>, L<Coro::Handle>, L<Coro::Socket>, L<Coro::Select>.	606	Event/IO: L<Coro::Timer>, L<Coro::Event>, L<Coro::Handle>, L<Coro::Socket>, L<Coro::Select>.
350		607

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Comparing Coro/Coro.pm (file contents): Revision 1.83 by root, Fri Nov 24 15:34:33 2006 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 1.83 by root, Fri Nov 24 15:34:33 2006 UTC vs.
Revision 1.148 by root, Fri Oct 5 20:11:25 2007 UTC