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

Comparing Coro/Coro.pm (file contents):
Revision 1.41 by root, Tue Nov 6 20:34:09 2001 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
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 $VERSION = '4.49';
		63
45	@EXPORT = qw(async cede schedule terminate current);	64	our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub);
46	%EXPORT_TAGS = (	65	our %EXPORT_TAGS = (
47	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],	66	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],
48	);	67	);
49	@EXPORT_OK = @{$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	=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.
185		318
186	=item terminate [arg...]	319	=item terminate [arg...]
187		320
188	Terminates the current process.	321	Terminates the current coroutine with the given status values (see L<cancel>).
189		322
190	Future versions of this function will allow result arguments.	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.
191		328
192	=cut	329	=cut
193		330
194	sub terminate {	331	sub terminate {
195	$current->{status} = [@_];
196	$current->cancel;	332	$current->cancel (@_);
197	&schedule;	333	}
198	die; # NORETURN	334
		335	sub killall {
		336	for (Coro::State::list) {
		337	$_->cancel
		338	if $_ != $current && UNIVERSAL::isa $_, "Coro";
		339	}
199	}	340	}
200		341
201	=back	342	=back
202		343
203	# dynamic methods	344	# dynamic methods
204		345
205	=head2 PROCESS METHODS	346	=head2 COROUTINE METHODS
206		347
207	These are the methods you can call on process objects.	348	These are the methods you can call on coroutine objects.
208		349
209	=over 4	350	=over 4
210		351
211	=item new Coro \&sub [, @args...]	352	=item new Coro \&sub [, @args...]
212		353
213	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
214	automatically terminates as if C<terminate> with the returned values were	355	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	356	called. To make the coroutine run you must first put it into the ready queue
216	by calling the ready method.	357	by calling the ready method.
217		358
218	=cut	359	See C<async> and C<Coro::State::new> for additional info about the
		360	coroutine environment.
219		361
		362	=cut
		363
220	sub _newcoro {	364	sub _run_coro {
221	terminate &{+shift};	365	terminate &{+shift};
222	}	366	}
223		367
224	sub new {	368	sub new {
225	my $class = shift;	369	my $class = shift;
226	bless {
227	_coro_state => (new Coro::State $_[0] && \&_newcoro, @_),
228	}, $class;
229	}
230		370
231	=item $process->ready	371	$class->SUPER::new (\&_run_coro, @_)
		372	}
232		373
233	Put the given process into the ready queue.	374	=item $success = $coroutine->ready
234		375
235	=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.
236		379
237	=item $process->cancel	380	=item $is_ready = $coroutine->is_ready
238		381
239	Like C<terminate>, but terminates the specified process instead.	382	Return wether the coroutine is currently the ready queue or not,
		383
		384	=item $coroutine->cancel (arg...)
		385
		386	Terminates the given coroutine and makes it return the given arguments as
		387	status (default: the empty list). Never returns if the coroutine is the
		388	current coroutine.
240		389
241	=cut	390	=cut
242		391
243	sub cancel {	392	sub cancel {
		393	my $self = shift;
		394	$self->{_status} = [@_];
		395
		396	if ($current == $self) {
244	push @destroy, $_[0];	397	push @destroy, $self;
245	$manager->ready;	398	$manager->ready;
246	&schedule if $current == $_[0];	399	&schedule while 1;
		400	} else {
		401	$self->_cancel;
		402	}
247	}	403	}
248		404
249	=item $process->join	405	=item $coroutine->join
250		406
251	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
252	C<terminate> function. C<join> can be called multiple times from multiple	408	C<terminate> or C<cancel> functions. C<join> can be called concurrently
253	processes.	409	from multiple coroutines.
254		410
255	=cut	411	=cut
256		412
257	sub join {	413	sub join {
258	my $self = shift;	414	my $self = shift;
		415
259	unless ($self->{status}) {	416	unless ($self->{_status}) {
260	push @{$self->{join}}, $current;	417	my $current = $current;
261	&schedule;	418
		419	push @{$self->{_on_destroy}}, sub {
		420	$current->ready;
		421	undef $current;
		422	};
		423
		424	&schedule while $current;
262	}	425	}
		426
263	wantarray ? @{$self->{status}} : $self->{status}[0];	427	wantarray ? @{$self->{_status}} : $self->{_status}[0];
264	}	428	}
265		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
266	=item $oldprio = $process->prio($newprio)	444	=item $oldprio = $coroutine->prio ($newprio)
267		445
268	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
269	process. Higher priority processes get run before lower priority	447	coroutine. Higher priority coroutines get run before lower priority
270	processes. Priorities are smalled signed integer (currently -4 .. +3),	448	coroutines. Priorities are small signed integers (currently -4 .. +3),
271	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
272	to get then):	450	to get then):
273		451
274	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
275	3 > 1 > 0 > -1 > -3 > -4	453	3 > 1 > 0 > -1 > -3 > -4
…		…
278	current->prio(PRIO_HIGH);	456	current->prio(PRIO_HIGH);
279		457
280	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
281	existing coroutine.	459	existing coroutine.
282		460
283	Changing the priority of the current process will take effect immediately,	461	Changing the priority of the current coroutine will take effect immediately,
284	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
285	running) will only take effect after the next schedule (of that	463	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.	464	coroutine). This is a bug that will be fixed in some future version.
287		465
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)	466	=item $newprio = $coroutine->nice ($change)
297		467
298	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.
299	higher values mean lower priority, just as in unix).	469	higher values mean lower priority, just as in unix).
300		470
301	=cut
302
303	sub nice {
304	$_[0]{prio} -= $_[1];
305	}
306
307	=item $olddesc = $process->desc($newdesc)	471	=item $olddesc = $coroutine->desc ($newdesc)
308		472
309	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
310	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.
311		494
312	=cut	495	=cut
313		496
314	sub desc {	497	sub desc {
315	my $old = $_[0]{desc};	498	my $old = $_[0]{desc};
…		…
317	$old;	500	$old;
318	}	501	}
319		502
320	=back	503	=back
321		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
322	=cut	605	=cut
323		606
324	1;	607	1;
325		608
326	=head1 BUGS/LIMITATIONS	609	=head1 BUGS/LIMITATIONS
327		610
328	- you must make very sure that no coro is still active on global destruction.	611	- you must make very sure that no coro is still active on global
329	very bad things might happen otherwise (usually segfaults).	612	destruction. very bad things might happen otherwise (usually segfaults).
		613
330	- this module is not thread-safe. You must only ever use this module from	614	- 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	615	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).	616	to allow per-thread schedulers, but Coro::State does not yet allow
		617	this).
333		618
334	=head1 SEE ALSO	619	=head1 SEE ALSO
335		620
336	L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,	621	Lower level Configuration, Coroutine Environment: L<Coro::State>.
337	L<Coro::Signal>, L<Coro::State>, L<Coro::Event>, L<Coro::RWLock>,	622
338	L<Coro::Handle>, 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>.
339		634
340	=head1 AUTHOR	635	=head1 AUTHOR
341		636
342	Marc Lehmann <pcg@goof.com>	637	Marc Lehmann <schmorp@schmorp.de>
343	http://www.goof.com/pcg/marc/	638	http://home.schmorp.de/
344		639
345	=cut	640	=cut
346		641

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Comparing Coro/Coro.pm (file contents): Revision 1.41 by root, Tue Nov 6 20:34:09 2001 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 1.41 by root, Tue Nov 6 20:34:09 2001 UTC vs.
Revision 1.175 by root, Sun Apr 6 19:23:50 2008 UTC