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

Comparing cvsroot/Coro/Coro.pm (file contents):
Revision 1.41 by root, Tue Nov 6 20:34:09 2001 UTC vs.
Revision 1.178 by root, Thu Apr 17 22:33:10 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
26	This module is still experimental, see the BUGS section below.	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).
27		41
28	In this module, coroutines are defined as "callchain + lexical variables	42	In this module, coroutines are defined as "callchain + lexical variables +
29	+ @_ + $_ + $@ + $^W + C stack), that is, a coroutine has it's own	43	@_ + $_ + $@ + $/ + 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	44	its own set of lexicals and its own set of perls most important global
31	important global variables.	45	variables (see L<Coro::State> for more configuration).
32		46
33	=cut	47	=cut
34		48
35	package Coro;	49	package Coro;
36		50
		51	use strict;
37	no warnings qw(uninitialized);	52	no warnings "uninitialized";
38		53
39	use Coro::State;	54	use Coro::State;
40		55
41	use base Exporter;	56	use base qw(Coro::State Exporter);
42		57
43	$VERSION = 0.52;	58	our $idle; # idle handler
		59	our $main; # main coroutine
		60	our $current; # current coroutine
44		61
		62	our $VERSION = '4.51';
		63
45	@EXPORT = qw(async cede schedule terminate current);	64	our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub);
46	%EXPORT_TAGS = (	65	our %EXPORT_TAGS = (
47	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],	66	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],
48	);	67	);
49	@EXPORT_OK = @{$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 (@_) {
…		…
77	};	99	};
78	}	100	}
79		101
80	}	102	}
81		103
		104	=over 4
		105
82	=item $main	106	=item $main
83		107
84	This coroutine represents the main program.	108	This coroutine represents the main program.
85		109
86	=cut	110	=cut
87		111
88	our $main = new Coro;	112	$main = new Coro;
89		113
90	=item $current (or as function: current)	114	=item $current (or as function: current)
91		115
92	The current coroutine (the last coroutine switched to). The initial value is C<$main> (of course).	116	The current coroutine (the last coroutine switched to). The initial value
		117	is C<$main> (of course).
93		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
94	=cut	123	=cut
		124
		125	$main->{desc} = "[main::]";
95		126
96	# maybe some other module used Coro::Specific before...	127	# maybe some other module used Coro::Specific before...
97	if ($current) {
98	$main->{specific} = $current->{specific};	128	$main->{_specific} = $current->{_specific}
99	}	129	if $current;
100		130
101	our $current = $main;	131	_set_current $main;
102		132
103	sub current() { $current }	133	sub current() { $current }
104		134
105	=item $idle	135	=item $idle
106		136
107	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
108	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.
109		140
110	=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.
111		144
112	# should be done using priorities :(	145	Please note that if your callback recursively invokes perl (e.g. for event
113	our $idle = new Coro sub {	146	handlers), then it must be prepared to be called recursively itself.
114	print STDERR "FATAL: deadlock detected\n";	147
115	exit(51);	148	=cut
		149
		150	$idle = sub {
		151	require Carp;
		152	Carp::croak ("FATAL: deadlock detected");
116	};	153	};
		154
		155	sub _cancel {
		156	my ($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	}
117		166
118	# this coroutine is necessary because a coroutine	167	# this coroutine is necessary because a coroutine
119	# cannot destroy itself.	168	# cannot destroy itself.
120	my @destroy;	169	my @destroy;
121	my $manager;	170	my $manager;
		171
122	$manager = new Coro sub {	172	$manager = new Coro sub {
123	while() {	173	while () {
124	# by overwriting the state object with the manager we destroy it	174	(shift @destroy)->_cancel
125	# while still being able to schedule this coroutine (in case it has
126	# been readied multiple times. this is harmless since the manager
127	# can be called as many times as neccessary and will always
128	# remove itself from the runqueue
129	while (@destroy) {	175	while @destroy;
130	my $coro = pop @destroy;	176
131	$coro->{status} \|\|= [];
132	$_->ready for @{delete $coro->{join} \|\| []};
133	$coro->{_coro_state} = $manager->{_coro_state};
134	}
135	&schedule;	177	&schedule;
136	}	178	}
137	};	179	};
		180	$manager->desc ("[coro manager]");
		181	$manager->prio (PRIO_MAX);
138		182
139	# static methods. not really.	183	=back
140		184
141	=head2 STATIC METHODS	185	=head2 STATIC METHODS
142		186
143	Static methods are actually functions that operate on the current process only.	187	Static methods are actually functions that operate on the current coroutine only.
144		188
145	=over 4	189	=over 4
146		190
147	=item async { ... } [@args...]	191	=item async { ... } [@args...]
148		192
149	Create a new asynchronous process and return it's process object	193	Create a new asynchronous coroutine and return it's coroutine object
150	(usually unused). When the sub returns the new process is automatically	194	(usually unused). When the sub returns the new coroutine is automatically
151	terminated.	195	terminated.
		196
		197	See the C<Coro::State::new> constructor for info about the coroutine
		198	environment in which coroutines run.
		199
		200	Calling C<exit> in a coroutine will do the same as calling exit outside
		201	the coroutine. Likewise, when the coroutine dies, the program will exit,
		202	just as it would in the main program.
152		203
153	# create a new coroutine that just prints its arguments	204	# create a new coroutine that just prints its arguments
154	async {	205	async {
155	print "@_\n";	206	print "@_\n";
156	} 1,2,3,4;	207	} 1,2,3,4;
157		208
158	The coderef you submit MUST NOT be a closure that refers to variables
159	in an outer scope. This does NOT work. Pass arguments into it instead.
160
161	=cut	209	=cut
162		210
163	sub async(&@) {	211	sub async(&@) {
164	my $pid = new Coro @_;	212	my $coro = new Coro @_;
165	$manager->ready; # this ensures that the stack is cloned from the manager
166	$pid->ready;	213	$coro->ready;
167	$pid;	214	$coro
		215	}
		216
		217	=item async_pool { ... } [@args...]
		218
		219	Similar to C<async>, but uses a coroutine pool, so you should not call
		220	terminate or join (although you are allowed to), and you get a coroutine
		221	that might have executed other code already (which can be good or bad :).
		222
		223	Also, the block is executed in an C<eval> context and a warning will be
		224	issued in case of an exception instead of terminating the program, as
		225	C<async> does. As the coroutine is being reused, stuff like C<on_destroy>
		226	will not work in the expected way, unless you call terminate or cancel,
		227	which somehow defeats the purpose of pooling.
		228
		229	The priority will be reset to C<0> after each job, tracing will be
		230	disabled, the description will be reset and the default output filehandle
		231	gets restored, so you can change alkl these. Otherwise the coroutine will
		232	be re-used "as-is": most notably if you change other per-coroutine global
		233	stuff such as C<$/> you need to revert that change, which is most simply
		234	done by using local as in C< local $/ >.
		235
		236	The pool size is limited to 8 idle coroutines (this can be adjusted by
		237	changing $Coro::POOL_SIZE), and there can be as many non-idle coros as
		238	required.
		239
		240	If you are concerned about pooled coroutines growing a lot because a
		241	single C<async_pool> used a lot of stackspace you can e.g. C<async_pool
		242	{ terminate }> once per second or so to slowly replenish the pool. In
		243	addition to that, when the stacks used by a handler grows larger than 16kb
		244	(adjustable with $Coro::POOL_RSS) it will also exit.
		245
		246	=cut
		247
		248	our $POOL_SIZE = 8;
		249	our $POOL_RSS = 16 * 1024;
		250	our @async_pool;
		251
		252	sub pool_handler {
		253	my $cb;
		254
		255	while () {
		256	eval {
		257	while () {
		258	_pool_1 $cb;
		259	&$cb;
		260	_pool_2 $cb;
		261	&schedule;
		262	}
		263	};
		264
		265	last if $@ eq "\3async_pool terminate\2\n";
		266	warn $@ if $@;
		267	}
		268	}
		269
		270	sub async_pool(&@) {
		271	# this is also inlined into the unlock_scheduler
		272	my $coro = (pop @async_pool) \|\| new Coro \&pool_handler;
		273
		274	$coro->{_invoke} = [@_];
		275	$coro->ready;
		276
		277	$coro
168	}	278	}
169		279
170	=item schedule	280	=item schedule
171		281
172	Calls the scheduler. Please note that the current process will not be put	282	Calls the scheduler. Please note that the current coroutine will not be put
173	into the ready queue, so calling this function usually means you will	283	into the ready queue, so calling this function usually means you will
174	never be called again.	284	never be called again unless something else (e.g. an event handler) calls
		285	ready.
175		286
176	=cut	287	The canonical way to wait on external events is this:
		288
		289	{
		290	# remember current coroutine
		291	my $current = $Coro::current;
		292
		293	# register a hypothetical event handler
		294	on_event_invoke sub {
		295	# wake up sleeping coroutine
		296	$current->ready;
		297	undef $current;
		298	};
		299
		300	# call schedule until event occurred.
		301	# in case we are woken up for other reasons
		302	# (current still defined), loop.
		303	Coro::schedule while $current;
		304	}
177		305
178	=item cede	306	=item cede
179		307
180	"Cede" to other processes. This function puts the current process into the	308	"Cede" to other coroutines. This function puts the current coroutine into the
181	ready queue and calls C<schedule>, which has the effect of giving up the	309	ready queue and calls C<schedule>, which has the effect of giving up the
182	current "timeslice" to other coroutines of the same or higher priority.	310	current "timeslice" to other coroutines of the same or higher priority.
183		311
184	=cut	312	=item Coro::cede_notself
		313
		314	Works like cede, but is not exported by default and will cede to any
		315	coroutine, regardless of priority, once.
185		316
186	=item terminate [arg...]	317	=item terminate [arg...]
187		318
188	Terminates the current process.	319	Terminates the current coroutine with the given status values (see L<cancel>).
189		320
190	Future versions of this function will allow result arguments.	321	=item killall
		322
		323	Kills/terminates/cancels all coroutines except the currently running
		324	one. This is useful after a fork, either in the child or the parent, as
		325	usually only one of them should inherit the running coroutines.
191		326
192	=cut	327	=cut
193		328
194	sub terminate {	329	sub terminate {
195	$current->{status} = [@_];
196	$current->cancel;	330	$current->cancel (@_);
197	&schedule;	331	}
198	die; # NORETURN	332
		333	sub killall {
		334	for (Coro::State::list) {
		335	$_->cancel
		336	if $_ != $current && UNIVERSAL::isa $_, "Coro";
		337	}
199	}	338	}
200		339
201	=back	340	=back
202		341
203	# dynamic methods
204
205	=head2 PROCESS METHODS	342	=head2 COROUTINE METHODS
206		343
207	These are the methods you can call on process objects.	344	These are the methods you can call on coroutine objects.
208		345
209	=over 4	346	=over 4
210		347
211	=item new Coro \&sub [, @args...]	348	=item new Coro \&sub [, @args...]
212		349
213	Create a new process and return it. When the sub returns the process	350	Create a new coroutine and return it. When the sub returns the coroutine
214	automatically terminates as if C<terminate> with the returned values were	351	automatically terminates as if C<terminate> with the returned values were
215	called. To make the process run you must first put it into the ready queue	352	called. To make the coroutine run you must first put it into the ready queue
216	by calling the ready method.	353	by calling the ready method.
217		354
218	=cut	355	See C<async> and C<Coro::State::new> for additional info about the
		356	coroutine environment.
219		357
		358	=cut
		359
220	sub _newcoro {	360	sub _run_coro {
221	terminate &{+shift};	361	terminate &{+shift};
222	}	362	}
223		363
224	sub new {	364	sub new {
225	my $class = shift;	365	my $class = shift;
226	bless {
227	_coro_state => (new Coro::State $_[0] && \&_newcoro, @_),
228	}, $class;
229	}
230		366
231	=item $process->ready	367	$class->SUPER::new (\&_run_coro, @_)
		368	}
232		369
233	Put the given process into the ready queue.	370	=item $success = $coroutine->ready
234		371
235	=cut	372	Put the given coroutine into the ready queue (according to it's priority)
		373	and return true. If the coroutine is already in the ready queue, do nothing
		374	and return false.
236		375
237	=item $process->cancel	376	=item $is_ready = $coroutine->is_ready
238		377
239	Like C<terminate>, but terminates the specified process instead.	378	Return wether the coroutine is currently the ready queue or not,
		379
		380	=item $coroutine->cancel (arg...)
		381
		382	Terminates the given coroutine and makes it return the given arguments as
		383	status (default: the empty list). Never returns if the coroutine is the
		384	current coroutine.
240		385
241	=cut	386	=cut
242		387
243	sub cancel {	388	sub cancel {
		389	my $self = shift;
		390	$self->{_status} = [@_];
		391
		392	if ($current == $self) {
244	push @destroy, $_[0];	393	push @destroy, $self;
245	$manager->ready;	394	$manager->ready;
246	&schedule if $current == $_[0];	395	&schedule while 1;
		396	} else {
		397	$self->_cancel;
		398	}
247	}	399	}
248		400
249	=item $process->join	401	=item $coroutine->join
250		402
251	Wait until the coroutine terminates and return any values given to the	403	Wait until the coroutine terminates and return any values given to the
252	C<terminate> function. C<join> can be called multiple times from multiple	404	C<terminate> or C<cancel> functions. C<join> can be called concurrently
253	processes.	405	from multiple coroutines.
254		406
255	=cut	407	=cut
256		408
257	sub join {	409	sub join {
258	my $self = shift;	410	my $self = shift;
		411
259	unless ($self->{status}) {	412	unless ($self->{_status}) {
260	push @{$self->{join}}, $current;	413	my $current = $current;
261	&schedule;	414
		415	push @{$self->{_on_destroy}}, sub {
		416	$current->ready;
		417	undef $current;
		418	};
		419
		420	&schedule while $current;
262	}	421	}
		422
263	wantarray ? @{$self->{status}} : $self->{status}[0];	423	wantarray ? @{$self->{_status}} : $self->{_status}[0];
264	}	424	}
265		425
		426	=item $coroutine->on_destroy (\&cb)
		427
		428	Registers a callback that is called when this coroutine gets destroyed,
		429	but before it is joined. The callback gets passed the terminate arguments,
		430	if any.
		431
		432	=cut
		433
		434	sub on_destroy {
		435	my ($self, $cb) = @_;
		436
		437	push @{ $self->{_on_destroy} }, $cb;
		438	}
		439
266	=item $oldprio = $process->prio($newprio)	440	=item $oldprio = $coroutine->prio ($newprio)
267		441
268	Sets (or gets, if the argument is missing) the priority of the	442	Sets (or gets, if the argument is missing) the priority of the
269	process. Higher priority processes get run before lower priority	443	coroutine. Higher priority coroutines get run before lower priority
270	processes. Priorities are smalled signed integer (currently -4 .. +3),	444	coroutines. Priorities are small signed integers (currently -4 .. +3),
271	that you can refer to using PRIO_xxx constants (use the import tag :prio	445	that you can refer to using PRIO_xxx constants (use the import tag :prio
272	to get then):	446	to get then):
273		447
274	PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN	448	PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN
275	3 > 1 > 0 > -1 > -3 > -4	449	3 > 1 > 0 > -1 > -3 > -4
…		…
278	current->prio(PRIO_HIGH);	452	current->prio(PRIO_HIGH);
279		453
280	The idle coroutine ($Coro::idle) always has a lower priority than any	454	The idle coroutine ($Coro::idle) always has a lower priority than any
281	existing coroutine.	455	existing coroutine.
282		456
283	Changing the priority of the current process will take effect immediately,	457	Changing the priority of the current coroutine will take effect immediately,
284	but changing the priority of processes in the ready queue (but not	458	but changing the priority of coroutines in the ready queue (but not
285	running) will only take effect after the next schedule (of that	459	running) will only take effect after the next schedule (of that
286	process). This is a bug that will be fixed in some future version.	460	coroutine). This is a bug that will be fixed in some future version.
287		461
288	=cut
289
290	sub prio {
291	my $old = $_[0]{prio};
292	$_[0]{prio} = $_[1] if @_ > 1;
293	$old;
294	}
295
296	=item $newprio = $process->nice($change)	462	=item $newprio = $coroutine->nice ($change)
297		463
298	Similar to C<prio>, but subtract the given value from the priority (i.e.	464	Similar to C<prio>, but subtract the given value from the priority (i.e.
299	higher values mean lower priority, just as in unix).	465	higher values mean lower priority, just as in unix).
300		466
301	=cut
302
303	sub nice {
304	$_[0]{prio} -= $_[1];
305	}
306
307	=item $olddesc = $process->desc($newdesc)	467	=item $olddesc = $coroutine->desc ($newdesc)
308		468
309	Sets (or gets in case the argument is missing) the description for this	469	Sets (or gets in case the argument is missing) the description for this
310	process. This is just a free-form string you can associate with a process.	470	coroutine. This is just a free-form string you can associate with a coroutine.
		471
		472	This method simply sets the C<< $coroutine->{desc} >> member to the given string. You
		473	can modify this member directly if you wish.
		474
		475	=item $coroutine->throw ([$scalar])
		476
		477	If C<$throw> is specified and defined, it will be thrown as an exception
		478	inside the coroutine at the next convinient point in time (usually after
		479	it gains control at the next schedule/transfer/cede). Otherwise clears the
		480	exception object.
		481
		482	The exception object will be thrown "as is" with the specified scalar in
		483	C<$@>, i.e. if it is a string, no line number or newline will be appended
		484	(unlike with C<die>).
		485
		486	This can be used as a softer means than C<cancel> to ask a coroutine to
		487	end itself, although there is no guarentee that the exception will lead to
		488	termination, and if the exception isn't caught it might well end the whole
		489	program.
311		490
312	=cut	491	=cut
313		492
314	sub desc {	493	sub desc {
315	my $old = $_[0]{desc};	494	my $old = $_[0]{desc};
…		…
317	$old;	496	$old;
318	}	497	}
319		498
320	=back	499	=back
321		500
		501	=head2 GLOBAL FUNCTIONS
		502
		503	=over 4
		504
		505	=item Coro::nready
		506
		507	Returns the number of coroutines that are currently in the ready state,
		508	i.e. that can be switched to. The value C<0> means that the only runnable
		509	coroutine is the currently running one, so C<cede> would have no effect,
		510	and C<schedule> would cause a deadlock unless there is an idle handler
		511	that wakes up some coroutines.
		512
		513	=item my $guard = Coro::guard { ... }
		514
		515	This creates and returns a guard object. Nothing happens until the object
		516	gets destroyed, in which case the codeblock given as argument will be
		517	executed. This is useful to free locks or other resources in case of a
		518	runtime error or when the coroutine gets canceled, as in both cases the
		519	guard block will be executed. The guard object supports only one method,
		520	C<< ->cancel >>, which will keep the codeblock from being executed.
		521
		522	Example: set some flag and clear it again when the coroutine gets canceled
		523	or the function returns:
		524
		525	sub do_something {
		526	my $guard = Coro::guard { $busy = 0 };
		527	$busy = 1;
		528
		529	# do something that requires $busy to be true
		530	}
		531
		532	=cut
		533
		534	sub guard(&) {
		535	bless \(my $cb = $_[0]), "Coro::guard"
		536	}
		537
		538	sub Coro::guard::cancel {
		539	${$_[0]} = sub { };
		540	}
		541
		542	sub Coro::guard::DESTROY {
		543	${$_[0]}->();
		544	}
		545
		546
		547	=item unblock_sub { ... }
		548
		549	This utility function takes a BLOCK or code reference and "unblocks" it,
		550	returning the new coderef. This means that the new coderef will return
		551	immediately without blocking, returning nothing, while the original code
		552	ref will be called (with parameters) from within its own coroutine.
		553
		554	The reason this function exists is that many event libraries (such as the
		555	venerable L<Event\|Event> module) are not coroutine-safe (a weaker form
		556	of thread-safety). This means you must not block within event callbacks,
		557	otherwise you might suffer from crashes or worse.
		558
		559	This function allows your callbacks to block by executing them in another
		560	coroutine where it is safe to block. One example where blocking is handy
		561	is when you use the L<Coro::AIO\|Coro::AIO> functions to save results to
		562	disk.
		563
		564	In short: simply use C<unblock_sub { ... }> instead of C<sub { ... }> when
		565	creating event callbacks that want to block.
		566
		567	=cut
		568
		569	our @unblock_queue;
		570
		571	# we create a special coro because we want to cede,
		572	# to reduce pressure on the coro pool (because most callbacks
		573	# return immediately and can be reused) and because we cannot cede
		574	# inside an event callback.
		575	our $unblock_scheduler = new Coro sub {
		576	while () {
		577	while (my $cb = pop @unblock_queue) {
		578	# this is an inlined copy of async_pool
		579	my $coro = (pop @async_pool) \|\| new Coro \&pool_handler;
		580
		581	$coro->{_invoke} = $cb;
		582	$coro->ready;
		583	cede; # for short-lived callbacks, this reduces pressure on the coro pool
		584	}
		585	schedule; # sleep well
		586	}
		587	};
		588	$unblock_scheduler->desc ("[unblock_sub scheduler]");
		589
		590	sub unblock_sub(&) {
		591	my $cb = shift;
		592
		593	sub {
		594	unshift @unblock_queue, [$cb, @_];
		595	$unblock_scheduler->ready;
		596	}
		597	}
		598
		599	=back
		600
322	=cut	601	=cut
323		602
324	1;	603	1;
325		604
326	=head1 BUGS/LIMITATIONS	605	=head1 BUGS/LIMITATIONS
327		606
328	- you must make very sure that no coro is still active on global destruction.	607	- you must make very sure that no coro is still active on global
329	very bad things might happen otherwise (usually segfaults).	608	destruction. very bad things might happen otherwise (usually segfaults).
		609
330	- this module is not thread-safe. You must only ever use this module from	610	- this module is not thread-safe. You should only ever use this module
331	the same thread (this requirement might be loosened in the future to	611	from the same thread (this requirement might be loosened in the future
332	allow per-thread schedulers, but Coro::State does not yet allow this).	612	to allow per-thread schedulers, but Coro::State does not yet allow
		613	this).
333		614
334	=head1 SEE ALSO	615	=head1 SEE ALSO
335		616
336	L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,	617	Lower level Configuration, Coroutine Environment: L<Coro::State>.
337	L<Coro::Signal>, L<Coro::State>, L<Coro::Event>, L<Coro::RWLock>,	618
338	L<Coro::Handle>, L<Coro::Socket>.	619	Debugging: L<Coro::Debug>.
		620
		621	Support/Utility: L<Coro::Specific>, L<Coro::Util>.
		622
		623	Locking/IPC: L<Coro::Signal>, L<Coro::Channel>, L<Coro::Semaphore>, L<Coro::SemaphoreSet>, L<Coro::RWLock>.
		624
		625	Event/IO: L<Coro::Timer>, L<Coro::Event>, L<Coro::Handle>, L<Coro::Socket>.
		626
		627	Compatibility: L<Coro::LWP>, L<Coro::Storable>, L<Coro::Select>.
		628
		629	Embedding: L<Coro::MakeMaker>.
339		630
340	=head1 AUTHOR	631	=head1 AUTHOR
341		632
342	Marc Lehmann <pcg@goof.com>	633	Marc Lehmann <schmorp@schmorp.de>
343	http://www.goof.com/pcg/marc/	634	http://home.schmorp.de/
344		635
345	=cut	636	=cut
346		637

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Revision 1.178 by root, Thu Apr 17 22:33:10 2008 UTC