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

Comparing Coro/Coro.pm (file contents):
Revision 1.66 by root, Thu Mar 3 17:20:31 2005 UTC vs.
Revision 1.175 by root, Sun Apr 6 19:23:50 2008 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 process 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	@_ + $_ + $@ + $/ + C stack), that is, a coroutine has its own callchain,
28	callchain, it's own set of lexicals and it's own set of perl's most	44	its own set of lexicals and its own set of perls most important global
29	important global variables.	45	variables (see L<Coro::State> for more configuration).
30		46
31	=cut	47	=cut
32		48
33	package Coro;	49	package Coro;
34		50
35	BEGIN { eval { require warnings } && warnings->unimport ("uninitialized") }	51	use strict;
		52	no warnings "uninitialized";
36		53
37	use Coro::State;	54	use Coro::State;
38		55
39	use vars qw($idle $main $current);	56	use base qw(Coro::State Exporter);
40		57
41	use base Exporter;	58	our $idle; # idle handler
		59	our $main; # main coroutine
		60	our $current; # current coroutine
42		61
43	$VERSION = 1.11;	62	our $VERSION = '4.49';
44		63
45	@EXPORT = qw(async cede schedule terminate current);	64	our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub);
46	%EXPORT_TAGS = (	65	our %EXPORT_TAGS = (
47	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],	66	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],
48	);	67	);
49	@EXPORT_OK = @{$EXPORT_TAGS{prio}};	68	our @EXPORT_OK = (@{$EXPORT_TAGS{prio}}, qw(nready));
50		69
51	{	70	{
52	my @async;	71	my @async;
53	my $init;	72	my $init;
54		73
55	# this way of handling attributes simply is NOT scalable ;()	74	# this way of handling attributes simply is NOT scalable ;()
56	sub import {	75	sub import {
		76	no strict 'refs';
		77
57	Coro->export_to_level(1, @_);	78	Coro->export_to_level (1, @_);
		79
58	my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};	80	my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};
59	*{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"} = sub {	81	*{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"} = sub {
60	my ($package, $ref) = (shift, shift);	82	my ($package, $ref) = (shift, shift);
61	my @attrs;	83	my @attrs;
62	for (@_) {	84	for (@_) {
…		…
89		111
90	$main = new Coro;	112	$main = new Coro;
91		113
92	=item $current (or as function: current)	114	=item $current (or as function: current)
93		115
94	The current coroutine (the last coroutine switched to). The initial value is C<$main> (of course).	116	The current coroutine (the last coroutine switched to). The initial value
		117	is C<$main> (of course).
95		118
		119	This variable is B<strictly> I<read-only>. It is provided for performance
		120	reasons. If performance is not essential you are encouraged to use the
		121	C<Coro::current> function instead.
		122
96	=cut	123	=cut
		124
		125	$main->{desc} = "[main::]";
97		126
98	# maybe some other module used Coro::Specific before...	127	# maybe some other module used Coro::Specific before...
99	if ($current) {
100	$main->{specific} = $current->{specific};	128	$main->{_specific} = $current->{_specific}
101	}	129	if $current;
102		130
103	$current = $main;	131	_set_current $main;
104		132
105	sub current() { $current }	133	sub current() { $current }
106		134
107	=item $idle	135	=item $idle
108		136
109	The coroutine to switch to when no other coroutine is running. The default	137	A callback that is called whenever the scheduler finds no ready coroutines
110	implementation prints "FATAL: deadlock detected" and exits.	138	to run. The default implementation prints "FATAL: deadlock detected" and
		139	exits, because the program has no other way to continue.
111		140
112	=cut	141	This hook is overwritten by modules such as C<Coro::Timer> and
		142	C<Coro::Event> to wait on an external event that hopefully wake up a
		143	coroutine so the scheduler can run it.
113		144
114	# should be done using priorities :(	145	Please note that if your callback recursively invokes perl (e.g. for event
115	$idle = new Coro sub {	146	handlers), then it must be prepared to be called recursively itself.
116	print STDERR "FATAL: deadlock detected\n";	147
117	exit(51);	148	=cut
		149
		150	$idle = sub {
		151	require Carp;
		152	Carp::croak ("FATAL: deadlock detected");
118	};	153	};
		154
		155	sub _cancel {
		156	my ($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	}
119		166
120	# this coroutine is necessary because a coroutine	167	# this coroutine is necessary because a coroutine
121	# cannot destroy itself.	168	# cannot destroy itself.
122	my @destroy;	169	my @destroy;
123	my $manager;	170	my $manager;
		171
124	$manager = new Coro sub {	172	$manager = new Coro sub {
125	while () {	173	while () {
126	# by overwriting the state object with the manager we destroy it	174	(shift @destroy)->_cancel
127	# while still being able to schedule this coroutine (in case it has
128	# been readied multiple times. this is harmless since the manager
129	# can be called as many times as neccessary and will always
130	# remove itself from the runqueue
131	while (@destroy) {	175	while @destroy;
132	my $coro = pop @destroy;
133	$coro->{status} \|\|= [];
134	$_->ready for @{delete $coro->{join} \|\| []};
135		176
136	# the next line destroys the _coro_state, but keeps the
137	# process itself intact (we basically make it a zombie
138	# process that always runs the manager thread, so it's possible
139	# to transfer() to this process).
140	$coro->{_coro_state} = $manager->{_coro_state};
141	}
142	&schedule;	177	&schedule;
143	}	178	}
144	};	179	};
		180	$manager->desc ("[coro manager]");
		181	$manager->prio (PRIO_MAX);
145		182
146	# static methods. not really.	183	# static methods. not really.
147		184
148	=back	185	=back
149		186
150	=head2 STATIC METHODS	187	=head2 STATIC METHODS
151		188
152	Static methods are actually functions that operate on the current process only.	189	Static methods are actually functions that operate on the current coroutine only.
153		190
154	=over 4	191	=over 4
155		192
156	=item async { ... } [@args...]	193	=item async { ... } [@args...]
157		194
158	Create a new asynchronous process and return it's process object	195	Create a new asynchronous coroutine and return it's coroutine object
159	(usually unused). When the sub returns the new process is automatically	196	(usually unused). When the sub returns the new coroutine is automatically
160	terminated.	197	terminated.
		198
		199	See the C<Coro::State::new> constructor for info about the coroutine
		200	environment in which coroutines run.
		201
		202	Calling C<exit> in a coroutine will do the same as calling exit outside
		203	the coroutine. Likewise, when the coroutine dies, the program will exit,
		204	just as it would in the main program.
161		205
162	# create a new coroutine that just prints its arguments	206	# create a new coroutine that just prints its arguments
163	async {	207	async {
164	print "@_\n";	208	print "@_\n";
165	} 1,2,3,4;	209	} 1,2,3,4;
166		210
167	=cut	211	=cut
168		212
169	sub async(&@) {	213	sub async(&@) {
170	my $pid = new Coro @_;	214	my $coro = new Coro @_;
171	$manager->ready; # this ensures that the stack is cloned from the manager
172	$pid->ready;	215	$coro->ready;
173	$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
174	}	280	}
175		281
176	=item schedule	282	=item schedule
177		283
178	Calls the scheduler. Please note that the current process will not be put	284	Calls the scheduler. Please note that the current coroutine will not be put
179	into the ready queue, so calling this function usually means you will	285	into the ready queue, so calling this function usually means you will
180	never be called again.	286	never be called again unless something else (e.g. an event handler) calls
		287	ready.
181		288
182	=cut	289	The canonical way to wait on external events is this:
		290
		291	{
		292	# remember current coroutine
		293	my $current = $Coro::current;
		294
		295	# register a hypothetical event handler
		296	on_event_invoke sub {
		297	# wake up sleeping coroutine
		298	$current->ready;
		299	undef $current;
		300	};
		301
		302	# call schedule until event occurred.
		303	# in case we are woken up for other reasons
		304	# (current still defined), loop.
		305	Coro::schedule while $current;
		306	}
183		307
184	=item cede	308	=item cede
185		309
186	"Cede" to other processes. This function puts the current process into the	310	"Cede" to other coroutines. This function puts the current coroutine into the
187	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
188	current "timeslice" to other coroutines of the same or higher priority.	312	current "timeslice" to other coroutines of the same or higher priority.
189		313
190	=cut	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.
191		318
192	=item terminate [arg...]	319	=item terminate [arg...]
193		320
194	Terminates the current process 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.
195		328
196	=cut	329	=cut
197		330
198	sub terminate {	331	sub terminate {
199	$current->cancel (@_);	332	$current->cancel (@_);
200	}	333	}
201		334
		335	sub killall {
		336	for (Coro::State::list) {
		337	$_->cancel
		338	if $_ != $current && UNIVERSAL::isa $_, "Coro";
		339	}
		340	}
		341
202	=back	342	=back
203		343
204	# dynamic methods	344	# dynamic methods
205		345
206	=head2 PROCESS METHODS	346	=head2 COROUTINE METHODS
207		347
208	These are the methods you can call on process objects.	348	These are the methods you can call on coroutine objects.
209		349
210	=over 4	350	=over 4
211		351
212	=item new Coro \&sub [, @args...]	352	=item new Coro \&sub [, @args...]
213		353
214	Create a new process and return it. When the sub returns the process	354	Create a new coroutine and return it. When the sub returns the coroutine
215	automatically terminates as if C<terminate> with the returned values were	355	automatically terminates as if C<terminate> with the returned values were
216	called. To make the process 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
217	by calling the ready method.	357	by calling the ready method.
218		358
219	=cut	359	See C<async> and C<Coro::State::new> for additional info about the
		360	coroutine environment.
220		361
		362	=cut
		363
221	sub _newcoro {	364	sub _run_coro {
222	terminate &{+shift};	365	terminate &{+shift};
223	}	366	}
224		367
225	sub new {	368	sub new {
226	my $class = shift;	369	my $class = shift;
227	bless {
228	_coro_state => (new Coro::State $_[0] && \&_newcoro, @_),
229	}, $class;
230	}
231		370
232	=item $process->ready	371	$class->SUPER::new (\&_run_coro, @_)
		372	}
233		373
234	Put the given process into the ready queue.	374	=item $success = $coroutine->ready
235		375
236	=cut	376	Put the given coroutine into the ready queue (according to it's priority)
		377	and return true. If the coroutine is already in the ready queue, do nothing
		378	and return false.
237		379
		380	=item $is_ready = $coroutine->is_ready
		381
		382	Return wether the coroutine is currently the ready queue or not,
		383
238	=item $process->cancel (arg...)	384	=item $coroutine->cancel (arg...)
239		385
240	Temrinates the given process and makes it return the given arguments as	386	Terminates the given coroutine and makes it return the given arguments as
241	status (default: the empty list).	387	status (default: the empty list). Never returns if the coroutine is the
		388	current coroutine.
242		389
243	=cut	390	=cut
244		391
245	sub cancel {	392	sub cancel {
246	my $self = shift;	393	my $self = shift;
247	$self->{status} = [@_];	394	$self->{_status} = [@_];
		395
		396	if ($current == $self) {
248	push @destroy, $self;	397	push @destroy, $self;
249	$manager->ready;	398	$manager->ready;
250	&schedule if $current == $self;	399	&schedule while 1;
		400	} else {
		401	$self->_cancel;
		402	}
251	}	403	}
252		404
253	=item $process->join	405	=item $coroutine->join
254		406
255	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
256	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
257	from multiple processes.	409	from multiple coroutines.
258		410
259	=cut	411	=cut
260		412
261	sub join {	413	sub join {
262	my $self = shift;	414	my $self = shift;
		415
263	unless ($self->{status}) {	416	unless ($self->{_status}) {
264	push @{$self->{join}}, $current;	417	my $current = $current;
265	&schedule;	418
		419	push @{$self->{_on_destroy}}, sub {
		420	$current->ready;
		421	undef $current;
		422	};
		423
		424	&schedule while $current;
266	}	425	}
		426
267	wantarray ? @{$self->{status}} : $self->{status}[0];	427	wantarray ? @{$self->{_status}} : $self->{_status}[0];
268	}	428	}
269		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;
		442	}
		443
270	=item $oldprio = $process->prio($newprio)	444	=item $oldprio = $coroutine->prio ($newprio)
271		445
272	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
273	process. Higher priority processes get run before lower priority	447	coroutine. Higher priority coroutines get run before lower priority
274	processes. Priorities are small signed integers (currently -4 .. +3),	448	coroutines. Priorities are small signed integers (currently -4 .. +3),
275	that you can refer to using PRIO_xxx constants (use the import tag :prio	449	that you can refer to using PRIO_xxx constants (use the import tag :prio
276	to get then):	450	to get then):
277		451
278	PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN	452	PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN
279	3 > 1 > 0 > -1 > -3 > -4	453	3 > 1 > 0 > -1 > -3 > -4
…		…
282	current->prio(PRIO_HIGH);	456	current->prio(PRIO_HIGH);
283		457
284	The idle coroutine ($Coro::idle) always has a lower priority than any	458	The idle coroutine ($Coro::idle) always has a lower priority than any
285	existing coroutine.	459	existing coroutine.
286		460
287	Changing the priority of the current process will take effect immediately,	461	Changing the priority of the current coroutine will take effect immediately,
288	but changing the priority of processes in the ready queue (but not	462	but changing the priority of coroutines in the ready queue (but not
289	running) will only take effect after the next schedule (of that	463	running) will only take effect after the next schedule (of that
290	process). This is a bug that will be fixed in some future version.	464	coroutine). This is a bug that will be fixed in some future version.
291		465
292	=cut
293
294	sub prio {
295	my $old = $_[0]{prio};
296	$_[0]{prio} = $_[1] if @_ > 1;
297	$old;
298	}
299
300	=item $newprio = $process->nice($change)	466	=item $newprio = $coroutine->nice ($change)
301		467
302	Similar to C<prio>, but subtract the given value from the priority (i.e.	468	Similar to C<prio>, but subtract the given value from the priority (i.e.
303	higher values mean lower priority, just as in unix).	469	higher values mean lower priority, just as in unix).
304		470
305	=cut
306
307	sub nice {
308	$_[0]{prio} -= $_[1];
309	}
310
311	=item $olddesc = $process->desc($newdesc)	471	=item $olddesc = $coroutine->desc ($newdesc)
312		472
313	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
314	process. This is just a free-form string you can associate with a process.	474	coroutine. This is just a free-form string you can associate with a coroutine.
		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.
315		494
316	=cut	495	=cut
317		496
318	sub desc {	497	sub desc {
319	my $old = $_[0]{desc};	498	my $old = $_[0]{desc};
…		…
321	$old;	500	$old;
322	}	501	}
323		502
324	=back	503	=back
325		504
		505	=head2 GLOBAL FUNCTIONS
		506
		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
		550
		551	=item unblock_sub { ... }
		552
		553	This utility function takes a BLOCK or code reference and "unblocks" it,
		554	returning the new coderef. This means that the new coderef will return
		555	immediately without blocking, returning nothing, while the original code
		556	ref will be called (with parameters) from within its own coroutine.
		557
		558	The reason this function exists is that many event libraries (such as the
		559	venerable L<Event\|Event> module) are not coroutine-safe (a weaker form
		560	of thread-safety). This means you must not block within event callbacks,
		561	otherwise you might suffer from crashes or worse.
		562
		563	This function allows your callbacks to block by executing them in another
		564	coroutine where it is safe to block. One example where blocking is handy
		565	is when you use the L<Coro::AIO\|Coro::AIO> functions to save results to
		566	disk.
		567
		568	In short: simply use C<unblock_sub { ... }> instead of C<sub { ... }> when
		569	creating event callbacks that want to block.
		570
		571	=cut
		572
		573	our @unblock_queue;
		574
		575	# we create a special coro because we want to cede,
		576	# to reduce pressure on the coro pool (because most callbacks
		577	# return immediately and can be reused) and because we cannot cede
		578	# inside an event callback.
		579	our $unblock_scheduler = new Coro sub {
		580	while () {
		581	while (my $cb = pop @unblock_queue) {
		582	# this is an inlined copy of async_pool
		583	my $coro = (pop @async_pool) \|\| new Coro \&pool_handler;
		584
		585	$coro->{_invoke} = $cb;
		586	$coro->ready;
		587	cede; # for short-lived callbacks, this reduces pressure on the coro pool
		588	}
		589	schedule; # sleep well
		590	}
		591	};
		592	$unblock_scheduler->desc ("[unblock_sub scheduler]");
		593
		594	sub unblock_sub(&) {
		595	my $cb = shift;
		596
		597	sub {
		598	unshift @unblock_queue, [$cb, @_];
		599	$unblock_scheduler->ready;
		600	}
		601	}
		602
		603	=back
		604
326	=cut	605	=cut
327		606
328	1;	607	1;
329		608
330	=head1 BUGS/LIMITATIONS	609	=head1 BUGS/LIMITATIONS
331		610
332	- 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
333	destruction. very bad things might happen otherwise (usually segfaults).	612	destruction. very bad things might happen otherwise (usually segfaults).
334		613
335	- 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
336	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
337	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
338	this).	617	this).
339		618
340	=head1 SEE ALSO	619	=head1 SEE ALSO
341		620
342	L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,	621	Lower level Configuration, Coroutine Environment: L<Coro::State>.
343	L<Coro::Signal>, L<Coro::State>, L<Coro::Timer>, L<Coro::Event>,	622
344	L<Coro::Handle>, L<Coro::RWLock>, L<Coro::Socket>.	623	Debugging: L<Coro::Debug>.
		624
		625	Support/Utility: L<Coro::Specific>, L<Coro::Util>.
		626
		627	Locking/IPC: L<Coro::Signal>, L<Coro::Channel>, L<Coro::Semaphore>, L<Coro::SemaphoreSet>, L<Coro::RWLock>.
		628
		629	Event/IO: L<Coro::Timer>, L<Coro::Event>, L<Coro::Handle>, L<Coro::Socket>.
		630
		631	Compatibility: L<Coro::LWP>, L<Coro::Storable>, L<Coro::Select>.
		632
		633	Embedding: L<Coro::MakeMaker>.
345		634
346	=head1 AUTHOR	635	=head1 AUTHOR
347		636
348	Marc Lehmann <schmorp@schmorp.de>	637	Marc Lehmann <schmorp@schmorp.de>
349	http://home.schmorp.de/	638	http://home.schmorp.de/

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Comparing Coro/Coro.pm (file contents): Revision 1.66 by root, Thu Mar 3 17:20:31 2005 UTC vs. Revision 1.175 by root, Sun Apr 6 19:23:50 2008 UTC

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Comparing Coro/Coro.pm (file contents):
Revision 1.66 by root, Thu Mar 3 17:20:31 2005 UTC vs.
Revision 1.175 by root, Sun Apr 6 19:23:50 2008 UTC