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

Comparing Coro/Coro.pm (file contents):
Revision 1.40 by root, Sun Oct 28 17:00:05 2001 UTC vs.
Revision 1.152 by root, Sun Oct 7 13:53:37 2007 UTC

…		…
6		6
7	use Coro;	7	use Coro;
8		8
9	async {	9	async {
10	# some asynchronous thread of execution	10	# some asynchronous thread of execution
		11	print "2\n";
		12	cede; # yield back to main
		13	print "4\n";
11	};	14	};
		15	print "1\n";
		16	cede; # yield to coroutine
		17	print "3\n";
		18	cede; # and again
12		19
13	# alternatively create an async 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
		58	our $idle; # idle handler
		59	our $main; # main coroutine
		60	our $current; # current coroutine
		61
43	$VERSION = 0.51;	62	our $VERSION = '4.1';
44		63
45	@EXPORT = qw(async cede schedule terminate current);	64	our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub);
46	%EXPORT_TAGS = (	65	our %EXPORT_TAGS = (
47	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],	66	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],
48	);	67	);
49	@EXPORT_OK = @{$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 (@_) {
…		…
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	# static methods. not really.
140		184
		185	=back
		186
141	=head2 STATIC METHODS	187	=head2 STATIC METHODS
142		188
143	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.
144		190
145	=over 4	191	=over 4
146		192
147	=item async { ... } [@args...]	193	=item async { ... } [@args...]
148		194
149	Create a new asynchronous process and return it's process object	195	Create a new asynchronous coroutine and return it's coroutine object
150	(usually unused). When the sub returns the new process is automatically	196	(usually unused). When the sub returns the new coroutine is automatically
151	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.
152		205
153	# create a new coroutine that just prints its arguments	206	# create a new coroutine that just prints its arguments
154	async {	207	async {
155	print "@_\n";	208	print "@_\n";
156	} 1,2,3,4;	209	} 1,2,3,4;
157		210
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	211	=cut
162		212
163	sub async(&@) {	213	sub async(&@) {
164	my $pid = new Coro @_;	214	my $coro = new Coro @_;
165	$manager->ready; # this ensures that the stack is cloned from the manager
166	$pid->ready;	215	$coro->ready;
167	$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
168	}	280	}
169		281
170	=item schedule	282	=item schedule
171		283
172	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
173	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
174	never be called again.	286	never be called again unless something else (e.g. an event handler) calls
		287	ready.
175		288
176	=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	}
177		307
178	=item cede	308	=item cede
179		309
180	"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
181	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
182	current "timeslice" to other coroutines of the same or higher priority.	312	current "timeslice" to other coroutines of the same or higher priority.
183		313
184	=cut	314	Returns true if at least one coroutine switch has happened.
		315
		316	=item Coro::cede_notself
		317
		318	Works like cede, but is not exported by default and will cede to any
		319	coroutine, regardless of priority, once.
		320
		321	Returns true if at least one coroutine switch has happened.
185		322
186	=item terminate [arg...]	323	=item terminate [arg...]
187		324
188	Terminates the current process.	325	Terminates the current coroutine with the given status values (see L<cancel>).
189		326
190	Future versions of this function will allow result arguments.	327	=item killall
		328
		329	Kills/terminates/cancels all coroutines except the currently running
		330	one. This is useful after a fork, either in the child or the parent, as
		331	usually only one of them should inherit the running coroutines.
191		332
192	=cut	333	=cut
193		334
194	sub terminate {	335	sub terminate {
195	$current->{status} = [@_];
196	$current->cancel;	336	$current->cancel (@_);
197	&schedule;	337	}
198	die; # NORETURN	338
		339	sub killall {
		340	for (Coro::State::list) {
		341	$_->cancel
		342	if $_ != $current && UNIVERSAL::isa $_, "Coro";
		343	}
199	}	344	}
200		345
201	=back	346	=back
202		347
203	# dynamic methods	348	# dynamic methods
204		349
205	=head2 PROCESS METHODS	350	=head2 COROUTINE METHODS
206		351
207	These are the methods you can call on process objects.	352	These are the methods you can call on coroutine objects.
208		353
209	=over 4	354	=over 4
210		355
211	=item new Coro \&sub [, @args...]	356	=item new Coro \&sub [, @args...]
212		357
213	Create a new process and return it. When the sub returns the process	358	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	359	automatically terminates as if C<terminate> with the returned values were
215	called. To start the process you must first put it into the ready queue by	360	called. To make the coroutine run you must first put it into the ready queue
216	calling the ready method.	361	by calling the ready method.
217		362
218	The coderef you submit MUST NOT be a closure that refers to variables	363	See C<async> and C<Coro::State::new> for additional info about the
219	in an outer scope. This does NOT work. Pass arguments into it instead.	364	coroutine environment.
220		365
221	=cut	366	=cut
222		367
223	sub _newcoro {	368	sub _run_coro {
224	terminate &{+shift};	369	terminate &{+shift};
225	}	370	}
226		371
227	sub new {	372	sub new {
228	my $class = shift;	373	my $class = shift;
229	bless {
230	_coro_state => (new Coro::State $_[0] && \&_newcoro, @_),
231	}, $class;
232	}
233		374
234	=item $process->ready	375	$class->SUPER::new (\&_run_coro, @_)
		376	}
235		377
236	Put the given process into the ready queue.	378	=item $success = $coroutine->ready
237		379
238	=cut	380	Put the given coroutine into the ready queue (according to it's priority)
		381	and return true. If the coroutine is already in the ready queue, do nothing
		382	and return false.
239		383
240	=item $process->cancel	384	=item $is_ready = $coroutine->is_ready
241		385
242	Like C<terminate>, but terminates the specified process instead.	386	Return wether the coroutine is currently the ready queue or not,
		387
		388	=item $coroutine->cancel (arg...)
		389
		390	Terminates the given coroutine and makes it return the given arguments as
		391	status (default: the empty list). Never returns if the coroutine is the
		392	current coroutine.
243		393
244	=cut	394	=cut
245		395
246	sub cancel {	396	sub cancel {
		397	my $self = shift;
		398	$self->{_status} = [@_];
		399
		400	if ($current == $self) {
247	push @destroy, $_[0];	401	push @destroy, $self;
248	$manager->ready;	402	$manager->ready;
249	&schedule if $current == $_[0];	403	&schedule while 1;
		404	} else {
		405	$self->_cancel;
		406	}
250	}	407	}
251		408
252	=item $process->join	409	=item $coroutine->join
253		410
254	Wait until the coroutine terminates and return any values given to the	411	Wait until the coroutine terminates and return any values given to the
255	C<terminate> function. C<join> can be called multiple times from multiple	412	C<terminate> or C<cancel> functions. C<join> can be called concurrently
256	processes.	413	from multiple coroutines.
257		414
258	=cut	415	=cut
259		416
260	sub join {	417	sub join {
261	my $self = shift;	418	my $self = shift;
		419
262	unless ($self->{status}) {	420	unless ($self->{_status}) {
263	push @{$self->{join}}, $current;	421	my $current = $current;
264	&schedule;	422
		423	push @{$self->{_on_destroy}}, sub {
		424	$current->ready;
		425	undef $current;
		426	};
		427
		428	&schedule while $current;
265	}	429	}
		430
266	wantarray ? @{$self->{status}} : $self->{status}[0];	431	wantarray ? @{$self->{_status}} : $self->{_status}[0];
267	}	432	}
268		433
		434	=item $coroutine->on_destroy (\&cb)
		435
		436	Registers a callback that is called when this coroutine gets destroyed,
		437	but before it is joined. The callback gets passed the terminate arguments,
		438	if any.
		439
		440	=cut
		441
		442	sub on_destroy {
		443	my ($self, $cb) = @_;
		444
		445	push @{ $self->{_on_destroy} }, $cb;
		446	}
		447
269	=item $oldprio = $process->prio($newprio)	448	=item $oldprio = $coroutine->prio ($newprio)
270		449
271	Sets the priority of the process. Higher priority processes get run before	450	Sets (or gets, if the argument is missing) the priority of the
272	lower priority processes. Priorities are smalled signed integer (currently	451	coroutine. Higher priority coroutines get run before lower priority
		452	coroutines. Priorities are small signed integers (currently -4 .. +3),
273	-4 .. +3), that you can refer to using PRIO_xxx constants (use the import	453	that you can refer to using PRIO_xxx constants (use the import tag :prio
274	tag :prio to get then):	454	to get then):
275		455
276	PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN	456	PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN
277	3 > 1 > 0 > -1 > -3 > -4	457	3 > 1 > 0 > -1 > -3 > -4
278		458
279	# set priority to HIGH	459	# set priority to HIGH
280	current->prio(PRIO_HIGH);	460	current->prio(PRIO_HIGH);
281		461
282	The idle coroutine ($Coro::idle) always has a lower priority than any	462	The idle coroutine ($Coro::idle) always has a lower priority than any
283	existing coroutine.	463	existing coroutine.
284		464
285	Changing the priority of the current process will take effect immediately,	465	Changing the priority of the current coroutine will take effect immediately,
286	but changing the priority of processes in the ready queue (but not	466	but changing the priority of coroutines in the ready queue (but not
287	running) will only take effect after the next schedule (of that	467	running) will only take effect after the next schedule (of that
288	process). This is a bug that will be fixed in some future version.	468	coroutine). This is a bug that will be fixed in some future version.
289		469
290	=cut
291
292	sub prio {
293	my $old = $_[0]{prio};
294	$_[0]{prio} = $_[1] if @_ > 1;
295	$old;
296	}
297
298	=item $newprio = $process->nice($change)	470	=item $newprio = $coroutine->nice ($change)
299		471
300	Similar to C<prio>, but subtract the given value from the priority (i.e.	472	Similar to C<prio>, but subtract the given value from the priority (i.e.
301	higher values mean lower priority, just as in unix).	473	higher values mean lower priority, just as in unix).
302		474
303	=cut	475	=item $olddesc = $coroutine->desc ($newdesc)
304		476
305	sub nice {	477	Sets (or gets in case the argument is missing) the description for this
306	$_[0]{prio} -= $_[1];	478	coroutine. This is just a free-form string you can associate with a coroutine.
		479
		480	This method simply sets the C<< $coroutine->{desc} >> member to the given string. You
		481	can modify this member directly if you wish.
		482
		483	=item $coroutine->throw ([$scalar])
		484
		485	If C<$throw> is specified and defined, it will be thrown as an exception
		486	inside the coroutine at the next convinient point in time (usually after
		487	it gains control at the next schedule/transfer/cede). Otherwise clears the
		488	exception object.
		489
		490	The exception object will be thrown "as is" with the specified scalar in
		491	C<$@>, i.e. if it is a string, no line number or newline will be appended
		492	(unlike with C<die>).
		493
		494	This can be used as a softer means than C<cancel> to ask a coroutine to
		495	end itself, although there is no guarentee that the exception will lead to
		496	termination, and if the exception isn't caught it might well end the whole
		497	program.
		498
		499	=cut
		500
		501	sub desc {
		502	my $old = $_[0]{desc};
		503	$_[0]{desc} = $_[1] if @_ > 1;
		504	$old;
307	}	505	}
308		506
309	=back	507	=back
310		508
		509	=head2 GLOBAL FUNCTIONS
		510
		511	=over 4
		512
		513	=item Coro::nready
		514
		515	Returns the number of coroutines that are currently in the ready state,
		516	i.e. that can be switched to. The value C<0> means that the only runnable
		517	coroutine is the currently running one, so C<cede> would have no effect,
		518	and C<schedule> would cause a deadlock unless there is an idle handler
		519	that wakes up some coroutines.
		520
		521	=item my $guard = Coro::guard { ... }
		522
		523	This creates and returns a guard object. Nothing happens until the object
		524	gets destroyed, in which case the codeblock given as argument will be
		525	executed. This is useful to free locks or other resources in case of a
		526	runtime error or when the coroutine gets canceled, as in both cases the
		527	guard block will be executed. The guard object supports only one method,
		528	C<< ->cancel >>, which will keep the codeblock from being executed.
		529
		530	Example: set some flag and clear it again when the coroutine gets canceled
		531	or the function returns:
		532
		533	sub do_something {
		534	my $guard = Coro::guard { $busy = 0 };
		535	$busy = 1;
		536
		537	# do something that requires $busy to be true
		538	}
		539
		540	=cut
		541
		542	sub guard(&) {
		543	bless \(my $cb = $_[0]), "Coro::guard"
		544	}
		545
		546	sub Coro::guard::cancel {
		547	${$_[0]} = sub { };
		548	}
		549
		550	sub Coro::guard::DESTROY {
		551	${$_[0]}->();
		552	}
		553
		554
		555	=item unblock_sub { ... }
		556
		557	This utility function takes a BLOCK or code reference and "unblocks" it,
		558	returning the new coderef. This means that the new coderef will return
		559	immediately without blocking, returning nothing, while the original code
		560	ref will be called (with parameters) from within its own coroutine.
		561
		562	The reason this function exists is that many event libraries (such as the
		563	venerable L<Event\|Event> module) are not coroutine-safe (a weaker form
		564	of thread-safety). This means you must not block within event callbacks,
		565	otherwise you might suffer from crashes or worse.
		566
		567	This function allows your callbacks to block by executing them in another
		568	coroutine where it is safe to block. One example where blocking is handy
		569	is when you use the L<Coro::AIO\|Coro::AIO> functions to save results to
		570	disk.
		571
		572	In short: simply use C<unblock_sub { ... }> instead of C<sub { ... }> when
		573	creating event callbacks that want to block.
		574
		575	=cut
		576
		577	our @unblock_queue;
		578
		579	# we create a special coro because we want to cede,
		580	# to reduce pressure on the coro pool (because most callbacks
		581	# return immediately and can be reused) and because we cannot cede
		582	# inside an event callback.
		583	our $unblock_scheduler = new Coro sub {
		584	while () {
		585	while (my $cb = pop @unblock_queue) {
		586	# this is an inlined copy of async_pool
		587	my $coro = (pop @async_pool) \|\| new Coro \&pool_handler;
		588
		589	$coro->{_invoke} = $cb;
		590	$coro->ready;
		591	cede; # for short-lived callbacks, this reduces pressure on the coro pool
		592	}
		593	schedule; # sleep well
		594	}
		595	};
		596	$unblock_scheduler->desc ("[unblock_sub scheduler]");
		597
		598	sub unblock_sub(&) {
		599	my $cb = shift;
		600
		601	sub {
		602	unshift @unblock_queue, [$cb, @_];
		603	$unblock_scheduler->ready;
		604	}
		605	}
		606
		607	=back
		608
311	=cut	609	=cut
312		610
313	1;	611	1;
314		612
315	=head1 BUGS/LIMITATIONS	613	=head1 BUGS/LIMITATIONS
316		614
317	- you must make very sure that no coro is still active on global destruction.	615	- you must make very sure that no coro is still active on global
318	very bad things might happen otherwise (usually segfaults).	616	destruction. very bad things might happen otherwise (usually segfaults).
		617
319	- this module is not thread-safe. You must only ever use this module from	618	- this module is not thread-safe. You should only ever use this module
320	the same thread (this requirement might be loosened in the future to	619	from the same thread (this requirement might be loosened in the future
321	allow per-thread schedulers, but Coro::State does not yet allow this).	620	to allow per-thread schedulers, but Coro::State does not yet allow
		621	this).
322		622
323	=head1 SEE ALSO	623	=head1 SEE ALSO
324		624
325	L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,	625	Lower level Configuration, Coroutine Environment: L<Coro::State>.
326	L<Coro::Signal>, L<Coro::State>, L<Coro::Event>, L<Coro::RWLock>,	626
327	L<Coro::Handle>, L<Coro::Socket>.	627	Debugging: L<Coro::Debug>.
		628
		629	Support/Utility: L<Coro::Specific>, L<Coro::Util>.
		630
		631	Locking/IPC: L<Coro::Signal>, L<Coro::Channel>, L<Coro::Semaphore>, L<Coro::SemaphoreSet>, L<Coro::RWLock>.
		632
		633	Event/IO: L<Coro::Timer>, L<Coro::Event>, L<Coro::Handle>, L<Coro::Socket>.
		634
		635	Compatibility: L<Coro::LWP>, L<Coro::Storable>, L<Coro::Select>.
		636
		637	Embedding: L<Coro:MakeMaker>.
328		638
329	=head1 AUTHOR	639	=head1 AUTHOR
330		640
331	Marc Lehmann <pcg@goof.com>	641	Marc Lehmann <schmorp@schmorp.de>
332	http://www.goof.com/pcg/marc/	642	http://home.schmorp.de/
333		643
334	=cut	644	=cut
335		645

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Revision 1.40 by root, Sun Oct 28 17:00:05 2001 UTC vs.
Revision 1.152 by root, Sun Oct 7 13:53:37 2007 UTC