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… …
2 2
3Coro - coroutine process abstraction 3Coro - coroutine process abstraction
4 4
5=head1 SYNOPSIS 5=head1 SYNOPSIS
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"; 11 print "2\n";
12 cede; # yield back to main 12 cede; # yield back to main
13 print "4\n"; 13 print "4\n";
14 }; 14 };
15 print "1\n"; 15 print "1\n";
16 cede; # yield to coroutine 16 cede; # yield to coroutine
17 print "3\n"; 17 print "3\n";
18 cede; # and again 18 cede; # and again
19 19
20 # use locking 20 # use locking
21 my $lock = new Coro::Semaphore; 21 my $lock = new Coro::Semaphore;
22 my $locked; 22 my $locked;
23 23
24 $lock->down; 24 $lock->down;
25 $locked = 1; 25 $locked = 1;
26 $lock->up; 26 $lock->up;
27 27
28=head1 DESCRIPTION 28=head1 DESCRIPTION
29 29
30This module collection manages coroutines. Coroutines are similar 30This module collection manages coroutines. Coroutines are similar to
31to threads but don't run in parallel at the same time even on SMP 31threads but don't (in general) run in parallel at the same time even
32machines. The specific flavor of coroutine used in this module also 32on SMP machines. The specific flavor of coroutine used in this module
33guarantees you that it will not switch between coroutines unless 33also guarantees you that it will not switch between coroutines unless
34necessary, at easily-identified points in your program, so locking and 34necessary, at easily-identified points in your program, so locking and
35parallel access are rarely an issue, making coroutine programming much 35parallel access are rarely an issue, making coroutine programming much
36safer than threads programming. 36safer and easier than threads programming.
37 37
38(Perl, however, does not natively support real threads but instead does a 38Unlike a normal perl program, however, coroutines allow you to have
39very slow and memory-intensive emulation of processes using threads. This 39multiple running interpreters that share data, which is especially useful
40is a performance win on Windows machines, and a loss everywhere else). 40to code pseudo-parallel processes and for event-based programming, such as
41multiple HTTP-GET requests running concurrently. See L<Coro::AnyEvent> to
42learn more.
43
44Coroutines are also useful because Perl has no support for threads (the so
45called "threads" that perl offers are nothing more than the (bad) process
46emulation coming from the Windows platform: On standard operating systems
47they serve no purpose whatsoever, except by making your programs slow and
48making them use a lot of memory. Best disable them when building perl, or
49aks your software vendor/distributor to do it for you).
41 50
42In this module, coroutines are defined as "callchain + lexical variables + 51In this module, coroutines are defined as "callchain + lexical variables +
43@_ + $_ + $@ + $/ + C stack), that is, a coroutine has its own callchain, 52@_ + $_ + $@ + $/ + C stack), that is, a coroutine has its own callchain,
44its own set of lexicals and its own set of perls most important global 53its own set of lexicals and its own set of perls most important global
45variables (see L<Coro::State> for more configuration). 54variables (see L<Coro::State> for more configuration).
… …
57 66
58our $idle; # idle handler 67our $idle; # idle handler
59our $main; # main coroutine 68our $main; # main coroutine
60our $current; # current coroutine 69our $current; # current coroutine
61 70
62our $VERSION = '4.51'; 71our $VERSION = '4.72';
63 72
64our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub); 73our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub);
65our %EXPORT_TAGS = ( 74our %EXPORT_TAGS = (
66 prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)], 75 prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],
67); 76);
68our @EXPORT_OK = (@{$EXPORT_TAGS{prio}}, qw(nready)); 77our @EXPORT_OK = (@{$EXPORT_TAGS{prio}}, qw(nready));
69 78
70{
71 my @async;
72 my $init;
73
74 # this way of handling attributes simply is NOT scalable ;()
75 sub import {
76 no strict 'refs';
77
78 Coro->export_to_level (1, @_);
79
80 my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};
81 *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"} = sub {
82 my ($package, $ref) = (shift, shift);
83 my @attrs;
84 for (@_) {
85 if ($_ eq "Coro") {
86 push @async, $ref;
87 unless ($init++) {
88 eval q{
89 sub INIT {
90 &async(pop @async) while @async;
91 }
92 };
93 }
94 } else {
95 push @attrs, $_;
96 }
97 }
98 return $old ? $old->($package, $ref, @attrs) : @attrs;
99 };
100 }
101
102}
103
104=over 4 79=over 4
105 80
106=item $main 81=item $Coro::main
107 82
108This coroutine represents the main program. 83This variable stores the coroutine object that represents the main
84program. While you cna C<ready> it and do most other things you can do to
85coroutines, it is mainly useful to compare again C<$Coro::current>, to see
86wether you are running in the main program or not.
109 87
110=cut 88=cut
111 89
112$main = new Coro; 90$main = new Coro;
113 91
114=item $current (or as function: current) 92=item $Coro::current
115 93
116The current coroutine (the last coroutine switched to). The initial value 94The coroutine object representing the current coroutine (the last
95coroutine that the Coro scheduler switched to). The initial value is
117is C<$main> (of course). 96C<$main> (of course).
118 97
119This variable is B<strictly> I<read-only>. It is provided for performance 98This variable is B<strictly> I<read-only>. You can take copies of the
120reasons. If performance is not essential you are encouraged to use the 99value stored in it and use it as any other coroutine object, but you must
121C<Coro::current> function instead. 100not otherwise modify the variable itself.
122 101
123=cut 102=cut
124 103
125$main->{desc} = "[main::]"; 104$main->{desc} = "[main::]";
126 105
… …
128$main->{_specific} = $current->{_specific} 107$main->{_specific} = $current->{_specific}
129 if $current; 108 if $current;
130 109
131_set_current $main; 110_set_current $main;
132 111
133sub current() { $current } 112sub current() { $current } # [DEPRECATED]
134 113
135=item $idle 114=item $Coro::idle
136 115
137A callback that is called whenever the scheduler finds no ready coroutines 116This variable is mainly useful to integrate Coro into event loops. It is
138to run. The default implementation prints "FATAL: deadlock detected" and 117usually better to rely on L<Coro::AnyEvent> or LC<Coro::EV>, as this is
139exits, because the program has no other way to continue. 118pretty low-level functionality.
119
120This variable stores a callback that is called whenever the scheduler
121finds no ready coroutines to run. The default implementation prints
122"FATAL: deadlock detected" and exits, because the program has no other way
123to continue.
140 124
141This hook is overwritten by modules such as C<Coro::Timer> and 125This hook is overwritten by modules such as C<Coro::Timer> and
142C<Coro::Event> to wait on an external event that hopefully wake up a 126C<Coro::AnyEvent> to wait on an external event that hopefully wake up a
143coroutine so the scheduler can run it. 127coroutine so the scheduler can run it.
128
129Note that the callback I<must not>, under any circumstances, block
130the current coroutine. Normally, this is achieved by having an "idle
131coroutine" that calls the event loop and then blocks again, and then
132readying that coroutine in the idle handler.
133
134See L<Coro::Event> or L<Coro::AnyEvent> for examples of using this
135technique.
144 136
145Please note that if your callback recursively invokes perl (e.g. for event 137Please note that if your callback recursively invokes perl (e.g. for event
146handlers), then it must be prepared to be called recursively itself. 138handlers), then it must be prepared to be called recursively itself.
147 139
148=cut 140=cut
… …
180$manager->desc ("[coro manager]"); 172$manager->desc ("[coro manager]");
181$manager->prio (PRIO_MAX); 173$manager->prio (PRIO_MAX);
182 174
183=back 175=back
184 176
185=head2 STATIC METHODS 177=head2 SIMPLE COROUTINE CREATION
186
187Static methods are actually functions that operate on the current coroutine only.
188 178
189=over 4 179=over 4
190 180
191=item async { ... } [@args...] 181=item async { ... } [@args...]
192 182
193Create a new asynchronous coroutine and return it's coroutine object 183Create a new coroutine and return it's coroutine object (usually
194(usually unused). When the sub returns the new coroutine is automatically 184unused). The coroutine will be put into the ready queue, so
185it will start running automatically on the next scheduler run.
186
187The first argument is a codeblock/closure that should be executed in the
188coroutine. When it returns argument returns the coroutine is automatically
195terminated. 189terminated.
196 190
191The remaining arguments are passed as arguments to the closure.
192
197See the C<Coro::State::new> constructor for info about the coroutine 193See the C<Coro::State::new> constructor for info about the coroutine
198environment in which coroutines run. 194environment in which coroutines are executed.
199 195
200Calling C<exit> in a coroutine will do the same as calling exit outside 196Calling C<exit> in a coroutine will do the same as calling exit outside
201the coroutine. Likewise, when the coroutine dies, the program will exit, 197the coroutine. Likewise, when the coroutine dies, the program will exit,
202just as it would in the main program. 198just as it would in the main program.
203 199
200If you do not want that, you can provide a default C<die> handler, or
201simply avoid dieing (by use of C<eval>).
202
204 # create a new coroutine that just prints its arguments 203Example: Create a new coroutine that just prints its arguments.
204
205 async { 205 async {
206 print "@_\n"; 206 print "@_\n";
207 } 1,2,3,4; 207 } 1,2,3,4;
208 208
209=cut 209=cut
… …
215} 215}
216 216
217=item async_pool { ... } [@args...] 217=item async_pool { ... } [@args...]
218 218
219Similar to C<async>, but uses a coroutine pool, so you should not call 219Similar to C<async>, but uses a coroutine pool, so you should not call
220terminate or join (although you are allowed to), and you get a coroutine 220terminate or join on it (although you are allowed to), and you get a
221that might have executed other code already (which can be good or bad :). 221coroutine that might have executed other code already (which can be good
222or bad :).
222 223
224On the plus side, this function is faster than creating (and destroying)
225a completely new coroutine, so if you need a lot of generic coroutines in
226quick successsion, use C<async_pool>, not C<async>.
227
223Also, the block is executed in an C<eval> context and a warning will be 228The code block is executed in an C<eval> context and a warning will be
224issued in case of an exception instead of terminating the program, as 229issued in case of an exception instead of terminating the program, as
225C<async> does. As the coroutine is being reused, stuff like C<on_destroy> 230C<async> does. As the coroutine is being reused, stuff like C<on_destroy>
226will not work in the expected way, unless you call terminate or cancel, 231will not work in the expected way, unless you call terminate or cancel,
227which somehow defeats the purpose of pooling. 232which somehow defeats the purpose of pooling (but is fine in the
233exceptional case).
228 234
229The priority will be reset to C<0> after each job, tracing will be 235The priority will be reset to C<0> after each run, tracing will be
230disabled, the description will be reset and the default output filehandle 236disabled, the description will be reset and the default output filehandle
231gets restored, so you can change alkl these. Otherwise the coroutine will 237gets restored, so you can change all these. Otherwise the coroutine will
232be re-used "as-is": most notably if you change other per-coroutine global 238be re-used "as-is": most notably if you change other per-coroutine global
233stuff such as C<$/> you need to revert that change, which is most simply 239stuff such as C<$/> you I<must needs> to revert that change, which is most
234done by using local as in C< local $/ >. 240simply done by using local as in: C< local $/ >.
235 241
236The pool size is limited to 8 idle coroutines (this can be adjusted by 242The pool size is limited to C<8> idle coroutines (this can be adjusted by
237changing $Coro::POOL_SIZE), and there can be as many non-idle coros as 243changing $Coro::POOL_SIZE), and there can be as many non-idle coros as
238required. 244required.
239 245
240If you are concerned about pooled coroutines growing a lot because a 246If you are concerned about pooled coroutines growing a lot because a
241single C<async_pool> used a lot of stackspace you can e.g. C<async_pool 247single 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 248{ terminate }> once per second or so to slowly replenish the pool. In
243addition to that, when the stacks used by a handler grows larger than 16kb 249addition to that, when the stacks used by a handler grows larger than 16kb
244(adjustable with $Coro::POOL_RSS) it will also exit. 250(adjustable via $Coro::POOL_RSS) it will also be destroyed.
245 251
246=cut 252=cut
247 253
248our $POOL_SIZE = 8; 254our $POOL_SIZE = 8;
249our $POOL_RSS = 16 * 1024; 255our $POOL_RSS = 16 * 1024;
… …
275 $coro->ready; 281 $coro->ready;
276 282
277 $coro 283 $coro
278} 284}
279 285
286=back
287
288=head2 STATIC METHODS
289
290Static methods are actually functions that operate on the current coroutine.
291
292=over 4
293
280=item schedule 294=item schedule
281 295
282Calls the scheduler. Please note that the current coroutine will not be put 296Calls the scheduler. The scheduler will find the next coroutine that is
297to be run from the ready queue and switches to it. The next coroutine
298to be run is simply the one with the highest priority that is longest
299in its ready queue. If there is no coroutine ready, it will clal the
300C<$Coro::idle> hook.
301
302Please note that the current coroutine will I<not> be put into the ready
283into the ready queue, so calling this function usually means you will 303queue, so calling this function usually means you will never be called
284never be called again unless something else (e.g. an event handler) calls 304again unless something else (e.g. an event handler) calls C<< ->ready >>,
285ready. 305thus waking you up.
306
307This makes C<schedule> I<the> generic method to use to block the current
308coroutine and wait for events: first you remember the current coroutine in
309a variable, then arrange for some callback of yours to call C<< ->ready
310>> on that once some event happens, and last you call C<schedule> to put
311yourself to sleep. Note that a lot of things can wake your coroutine up,
312so you need to check wether the event indeed happened, e.g. by storing the
313status in a variable.
286 314
287The canonical way to wait on external events is this: 315The canonical way to wait on external events is this:
288 316
289 { 317 {
290 # remember current coroutine 318 # remember current coroutine
… …
303 Coro::schedule while $current; 331 Coro::schedule while $current;
304 } 332 }
305 333
306=item cede 334=item cede
307 335
308"Cede" to other coroutines. This function puts the current coroutine into the 336"Cede" to other coroutines. This function puts the current coroutine into
309ready queue and calls C<schedule>, which has the effect of giving up the 337the ready queue and calls C<schedule>, which has the effect of giving
310current "timeslice" to other coroutines of the same or higher priority. 338up the current "timeslice" to other coroutines of the same or higher
339priority. Once your coroutine gets its turn again it will automatically be
340resumed.
341
342This function is often called C<yield> in other languages.
311 343
312=item Coro::cede_notself 344=item Coro::cede_notself
313 345
314Works like cede, but is not exported by default and will cede to any 346Works like cede, but is not exported by default and will cede to I<any>
315coroutine, regardless of priority, once. 347coroutine, regardless of priority. This is useful sometimes to ensure
348progress is made.
316 349
317=item terminate [arg...] 350=item terminate [arg...]
318 351
319Terminates the current coroutine with the given status values (see L<cancel>). 352Terminates the current coroutine with the given status values (see L<cancel>).
320 353
321=item killall 354=item killall
322 355
323Kills/terminates/cancels all coroutines except the currently running 356Kills/terminates/cancels all coroutines except the currently running
324one. This is useful after a fork, either in the child or the parent, as 357one. This is useful after a fork, either in the child or the parent, as
325usually only one of them should inherit the running coroutines. 358usually only one of them should inherit the running coroutines.
359
360Note that while this will try to free some of the main programs resources,
361you cnanot free all of them, so if a coroutine that is not the main
362program calls this function, there will be some one-time resource leak.
326 363
327=cut 364=cut
328 365
329sub terminate { 366sub terminate {
330 $current->cancel (@_); 367 $current->cancel (@_);
… …
339 376
340=back 377=back
341 378
342=head2 COROUTINE METHODS 379=head2 COROUTINE METHODS
343 380
344These are the methods you can call on coroutine objects. 381These are the methods you can call on coroutine objects (or to create
382them).
345 383
346=over 4 384=over 4
347 385
348=item new Coro \&sub [, @args...] 386=item new Coro \&sub [, @args...]
349 387
350Create a new coroutine and return it. When the sub returns the coroutine 388Create a new coroutine and return it. When the sub returns, the coroutine
351automatically terminates as if C<terminate> with the returned values were 389automatically terminates as if C<terminate> with the returned values were
352called. To make the coroutine run you must first put it into the ready queue 390called. To make the coroutine run you must first put it into the ready
353by calling the ready method. 391queue by calling the ready method.
354 392
355See C<async> and C<Coro::State::new> for additional info about the 393See C<async> and C<Coro::State::new> for additional info about the
356coroutine environment. 394coroutine environment.
357 395
358=cut 396=cut
… …
367 $class->SUPER::new (\&_run_coro, @_) 405 $class->SUPER::new (\&_run_coro, @_)
368} 406}
369 407
370=item $success = $coroutine->ready 408=item $success = $coroutine->ready
371 409
372Put the given coroutine into the ready queue (according to it's priority) 410Put the given coroutine into the end of its ready queue (there is one
373and return true. If the coroutine is already in the ready queue, do nothing 411queue for each priority) and return true. If the coroutine is already in
374and return false. 412the ready queue, do nothing and return false.
413
414This ensures that the scheduler will resume this coroutine automatically
415once all the coroutines of higher priority and all coroutines of the same
416priority that were put into the ready queue earlier have been resumed.
375 417
376=item $is_ready = $coroutine->is_ready 418=item $is_ready = $coroutine->is_ready
377 419
378Return wether the coroutine is currently the ready queue or not, 420Return wether the coroutine is currently the ready queue or not,
379 421
… …
400 442
401=item $coroutine->join 443=item $coroutine->join
402 444
403Wait until the coroutine terminates and return any values given to the 445Wait until the coroutine terminates and return any values given to the
404C<terminate> or C<cancel> functions. C<join> can be called concurrently 446C<terminate> or C<cancel> functions. C<join> can be called concurrently
405from multiple coroutines. 447from multiple coroutines, and all will be resumed and given the status
448return once the C<$coroutine> terminates.
406 449
407=cut 450=cut
408 451
409sub join { 452sub join {
410 my $self = shift; 453 my $self = shift;
… …
425 468
426=item $coroutine->on_destroy (\&cb) 469=item $coroutine->on_destroy (\&cb)
427 470
428Registers a callback that is called when this coroutine gets destroyed, 471Registers a callback that is called when this coroutine gets destroyed,
429but before it is joined. The callback gets passed the terminate arguments, 472but before it is joined. The callback gets passed the terminate arguments,
430if any. 473if any, and I<must not> die, under any circumstances.
431 474
432=cut 475=cut
433 476
434sub on_destroy { 477sub on_destroy {
435 my ($self, $cb) = @_; 478 my ($self, $cb) = @_;
… …
503=over 4 546=over 4
504 547
505=item Coro::nready 548=item Coro::nready
506 549
507Returns the number of coroutines that are currently in the ready state, 550Returns the number of coroutines that are currently in the ready state,
508i.e. that can be switched to. The value C<0> means that the only runnable 551i.e. that can be switched to by calling C<schedule> directory or
552indirectly. The value C<0> means that the only runnable coroutine is the
509coroutine is the currently running one, so C<cede> would have no effect, 553currently running one, so C<cede> would have no effect, and C<schedule>
510and C<schedule> would cause a deadlock unless there is an idle handler 554would cause a deadlock unless there is an idle handler that wakes up some
511that wakes up some coroutines. 555coroutines.
512 556
513=item my $guard = Coro::guard { ... } 557=item my $guard = Coro::guard { ... }
514 558
515This creates and returns a guard object. Nothing happens until the object 559This creates and returns a guard object. Nothing happens until the object
516gets destroyed, in which case the codeblock given as argument will be 560gets destroyed, in which case the codeblock given as argument will be
… …
545 589
546 590
547=item unblock_sub { ... } 591=item unblock_sub { ... }
548 592
549This utility function takes a BLOCK or code reference and "unblocks" it, 593This utility function takes a BLOCK or code reference and "unblocks" it,
550returning the new coderef. This means that the new coderef will return 594returning a new coderef. Unblocking means that calling the new coderef
551immediately without blocking, returning nothing, while the original code 595will return immediately without blocking, returning nothing, while the
552ref will be called (with parameters) from within its own coroutine. 596original code ref will be called (with parameters) from within another
597coroutine.
553 598
554The reason this function exists is that many event libraries (such as the 599The reason this function exists is that many event libraries (such as the
555venerable L<Event|Event> module) are not coroutine-safe (a weaker form 600venerable L<Event|Event> module) are not coroutine-safe (a weaker form
556of thread-safety). This means you must not block within event callbacks, 601of thread-safety). This means you must not block within event callbacks,
557otherwise you might suffer from crashes or worse. 602otherwise you might suffer from crashes or worse. The only event library
603currently known that is safe to use without C<unblock_sub> is L<EV>.
558 604
559This function allows your callbacks to block by executing them in another 605This function allows your callbacks to block by executing them in another
560coroutine where it is safe to block. One example where blocking is handy 606coroutine where it is safe to block. One example where blocking is handy
561is when you use the L<Coro::AIO|Coro::AIO> functions to save results to 607is when you use the L<Coro::AIO|Coro::AIO> functions to save results to
562disk. 608disk, for example.
563 609
564In short: simply use C<unblock_sub { ... }> instead of C<sub { ... }> when 610In short: simply use C<unblock_sub { ... }> instead of C<sub { ... }> when
565creating event callbacks that want to block. 611creating event callbacks that want to block.
612
613If your handler does not plan to block (e.g. simply sends a message to
614another coroutine, or puts some other coroutine into the ready queue),
615there is no reason to use C<unblock_sub>.
616
617Note that you also need to use C<unblock_sub> for any other callbacks that
618are indirectly executed by any C-based event loop. For example, when you
619use a module that uses L<AnyEvent> (and you use L<Coro::AnyEvent>) and it
620provides callbacks that are the result of some event callback, then you
621must not block either, or use C<unblock_sub>.
566 622
567=cut 623=cut
568 624
569our @unblock_queue; 625our @unblock_queue;
570 626
… …
602 658
6031; 6591;
604 660
605=head1 BUGS/LIMITATIONS 661=head1 BUGS/LIMITATIONS
606 662
607 - you must make very sure that no coro is still active on global
608 destruction. very bad things might happen otherwise (usually segfaults).
609
610 - this module is not thread-safe. You should only ever use this module 663This module is not perl-pseudo-thread-safe. You should only ever use this
611 from the same thread (this requirement might be loosened in the future 664module from the same thread (this requirement might be removed in the
612 to allow per-thread schedulers, but Coro::State does not yet allow 665future to allow per-thread schedulers, but Coro::State does not yet allow
613 this). 666this). I recommend disabling thread support and using processes, as this
667is much faster and uses less memory.
614 668
615=head1 SEE ALSO 669=head1 SEE ALSO
616 670
617Lower level Configuration, Coroutine Environment: L<Coro::State>. 671Event-Loop integration: L<Coro::AnyEvent>, L<Coro::EV>, L<Coro::Event>.
618 672
619Debugging: L<Coro::Debug>. 673Debugging: L<Coro::Debug>.
620 674
621Support/Utility: L<Coro::Specific>, L<Coro::Util>. 675Support/Utility: L<Coro::Specific>, L<Coro::Util>.
622 676
623Locking/IPC: L<Coro::Signal>, L<Coro::Channel>, L<Coro::Semaphore>, L<Coro::SemaphoreSet>, L<Coro::RWLock>. 677Locking/IPC: L<Coro::Signal>, L<Coro::Channel>, L<Coro::Semaphore>, L<Coro::SemaphoreSet>, L<Coro::RWLock>.
624 678
625Event/IO: L<Coro::Timer>, L<Coro::Event>, L<Coro::Handle>, L<Coro::Socket>. 679IO/Timers: L<Coro::Timer>, L<Coro::Handle>, L<Coro::Socket>, L<Coro::AIO>.
626 680
627Compatibility: L<Coro::LWP>, L<Coro::Storable>, L<Coro::Select>. 681Compatibility: L<Coro::LWP>, L<Coro::BDB>, L<Coro::Storable>, L<Coro::Select>.
628 682
629Embedding: L<Coro::MakeMaker>. 683XS API: L<Coro::MakeMaker>.
684
685Low level Configuration, Coroutine Environment: L<Coro::State>.
630 686
631=head1 AUTHOR 687=head1 AUTHOR
632 688
633 Marc Lehmann <schmorp@schmorp.de> 689 Marc Lehmann <schmorp@schmorp.de>
634 http://home.schmorp.de/ 690 http://home.schmorp.de/

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