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

Comparing Coro/Coro.pm (file contents):
Revision 1.14 by root, Tue Jul 17 02:21:56 2001 UTC vs.
Revision 1.74 by root, Mon Dec 26 18:48:11 2005 UTC

…		…
14		14
15	sub some_func : Coro {	15	sub some_func : Coro {
16	# some more async code	16	# some more async code
17	}	17	}
18		18
19	yield;	19	cede;
20		20
21	=head1 DESCRIPTION	21	=head1 DESCRIPTION
22		22
23	This module collection manages coroutines. Coroutines are similar to	23	This module collection manages coroutines. Coroutines are similar to
24	Threads but don't run in parallel.	24	threads but don't run in parallel.
25		25
26	This module is still experimental, see the BUGS section below.	26	In this module, coroutines are defined as "callchain + lexical variables
		27	+ @_ + $_ + $@ + $^W + C stack), that is, a coroutine has it's own
		28	callchain, it's own set of lexicals and it's own set of perl's most
		29	important global variables.
27		30
28	=cut	31	=cut
29		32
30	package Coro;	33	package Coro;
31		34
		35	use strict;
		36	no warnings "uninitialized";
		37
32	use Coro::State;	38	use Coro::State;
33		39
34	use base Exporter;	40	use base Exporter::;
35		41
36	$VERSION = 0.05;	42	our $idle; # idle coroutine
		43	our $main; # main coroutine
		44	our $current; # current coroutine
37		45
		46	our $VERSION = 1.7;
		47
38	@EXPORT = qw(async yield schedule terminate);	48	our @EXPORT = qw(async cede schedule terminate current);
39	@EXPORT_OK = qw($current);	49	our %EXPORT_TAGS = (
		50	prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],
		51	);
		52	our @EXPORT_OK = @{$EXPORT_TAGS{prio}};
40		53
41	{	54	{
42	use subs 'async';
43
44	my @async;	55	my @async;
		56	my $init;
45		57
46	# this way of handling attributes simply is NOT scalable ;()	58	# this way of handling attributes simply is NOT scalable ;()
47	sub import {	59	sub import {
		60	no strict 'refs';
		61
48	Coro->export_to_level(1, @_);	62	Coro->export_to_level(1, @_);
		63
49	my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};	64	my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};
50	*{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"} = sub {	65	*{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"} = sub {
51	my ($package, $ref) = (shift, shift);	66	my ($package, $ref) = (shift, shift);
52	my @attrs;	67	my @attrs;
53	for (@_) {	68	for (@_) {
54	if ($_ eq "Coro") {	69	if ($_ eq "Coro") {
55	push @async, $ref;	70	push @async, $ref;
		71	unless ($init++) {
		72	eval q{
		73	sub INIT {
		74	&async(pop @async) while @async;
		75	}
		76	};
		77	}
56	} else {	78	} else {
57	push @attrs, @_;	79	push @attrs, $_;
58	}	80	}
59	}	81	}
60	return $old ? $old->($package, $name, @attrs) : @attrs;	82	return $old ? $old->($package, $ref, @attrs) : @attrs;
61	};	83	};
62	}	84	}
63		85
64	sub INIT {
65	async pop @async while @async;
66	}
67	}	86	}
		87
		88	=over 4
68		89
69	=item $main	90	=item $main
70		91
71	This coroutine represents the main program.	92	This coroutine represents the main program.
72		93
73	=cut	94	=cut
74		95
75	our $main = new Coro;	96	$main = new Coro;
76		97
77	=item $current	98	=item $current (or as function: current)
78		99
79	The current coroutine (the last coroutine switched to). The initial value is C<$main> (of course).	100	The current coroutine (the last coroutine switched to). The initial value is C<$main> (of course).
80		101
81	=cut	102	=cut
82		103
83	# maybe some other module used Coro::Specific before...	104	# maybe some other module used Coro::Specific before...
84	if ($current) {	105	if ($current) {
85	$main->{specific} = $current->{specific};	106	$main->{specific} = $current->{specific};
86	}	107	}
87		108
88	our $current = $main;	109	$current = $main;
		110
		111	sub current() { $current }
89		112
90	=item $idle	113	=item $idle
91		114
92	The coroutine to switch to when no other coroutine is running. The default	115	The coroutine to switch to when no other coroutine is running. The default
93	implementation prints "FATAL: deadlock detected" and exits.	116	implementation prints "FATAL: deadlock detected" and exits.
94		117
95	=cut	118	=cut
96		119
97	# should be done using priorities :(	120	# should be done using priorities :(
98	our $idle = new Coro sub {	121	$idle = new Coro sub {
99	print STDERR "FATAL: deadlock detected\n";	122	print STDERR "FATAL: deadlock detected\n";
100	exit(51);	123	exit(51);
101	};	124	};
102		125
103	# we really need priorities...	126	# this coroutine is necessary because a coroutine
104	## my @ready; #d#	127	# cannot destroy itself.
105	our @ready = (); # the ready queue. hehe, rather broken ;)	128	my @destroy;
		129	my $manager;
		130	$manager = new Coro sub {
		131	while () {
		132	# by overwriting the state object with the manager we destroy it
		133	# while still being able to schedule this coroutine (in case it has
		134	# been readied multiple times. this is harmless since the manager
		135	# can be called as many times as neccessary and will always
		136	# remove itself from the runqueue
		137	while (@destroy) {
		138	my $coro = pop @destroy;
		139	$coro->{status} \|\|= [];
		140	$_->ready for @{delete $coro->{join} \|\| []};
		141
		142	# the next line destroys the _coro_state, but keeps the
		143	# process itself intact (we basically make it a zombie
		144	# process that always runs the manager thread, so it's possible
		145	# to transfer() to this process).
		146	$coro->{_coro_state} = $manager->{_coro_state};
		147	}
		148	&schedule;
		149	}
		150	};
106		151
107	# static methods. not really.	152	# static methods. not really.
		153
		154	=back
108		155
109	=head2 STATIC METHODS	156	=head2 STATIC METHODS
110		157
111	Static methods are actually functions that operate on the current process only.	158	Static methods are actually functions that operate on the current process only.
112		159
…		…
121	# create a new coroutine that just prints its arguments	168	# create a new coroutine that just prints its arguments
122	async {	169	async {
123	print "@_\n";	170	print "@_\n";
124	} 1,2,3,4;	171	} 1,2,3,4;
125		172
126	The coderef you submit MUST NOT be a closure that refers to variables
127	in an outer scope. This does NOT work. Pass arguments into it instead.
128
129	=cut	173	=cut
130		174
131	sub async(&@) {	175	sub async(&@) {
132	my $pid = new Coro @_;	176	my $pid = new Coro @_;
		177	$manager->ready; # this ensures that the stack is cloned from the manager
133	$pid->ready;	178	$pid->ready;
134	$pid;	179	$pid;
135	}	180	}
136		181
137	=item schedule	182	=item schedule
…		…
140	into the ready queue, so calling this function usually means you will	185	into the ready queue, so calling this function usually means you will
141	never be called again.	186	never be called again.
142		187
143	=cut	188	=cut
144		189
145	my $prev;
146
147	sub schedule {
148	# should be done using priorities :(
149	($prev, $current) = ($current, shift @ready \|\| $idle);
150	Coro::State::transfer($prev, $current);
151	}
152
153	=item yield	190	=item cede
154		191
155	Yield to other processes. This function puts the current process into the	192	"Cede" to other processes. This function puts the current process into the
156	ready queue and calls C<schedule>.	193	ready queue and calls C<schedule>, which has the effect of giving up the
		194	current "timeslice" to other coroutines of the same or higher priority.
157		195
158	=cut	196	=cut
159		197
160	sub yield {
161	$current->ready;
162	&schedule;
163	}
164
165	=item terminate	198	=item terminate [arg...]
166		199
167	Terminates the current process.	200	Terminates the current process with the given status values (see L<cancel>).
168
169	Future versions of this function will allow result arguments.
170		201
171	=cut	202	=cut
172		203
173	sub terminate {	204	sub terminate {
174	$current->{_results} = [@_];	205	$current->cancel (@_);
175	&schedule;
176	}	206	}
177		207
178	=back	208	=back
179		209
180	# dynamic methods	210	# dynamic methods
…		…
186	=over 4	216	=over 4
187		217
188	=item new Coro \&sub [, @args...]	218	=item new Coro \&sub [, @args...]
189		219
190	Create a new process and return it. When the sub returns the process	220	Create a new process and return it. When the sub returns the process
191	automatically terminates. To start the process you must first put it into	221	automatically terminates as if C<terminate> with the returned values were
		222	called. To make the process run you must first put it into the ready queue
192	the ready queue by calling the ready method.	223	by calling the ready method.
193
194	The coderef you submit MUST NOT be a closure that refers to variables
195	in an outer scope. This does NOT work. Pass arguments into it instead.
196		224
197	=cut	225	=cut
198		226
199	sub _newcoro {	227	sub _newcoro {
200	terminate &{+shift};	228	terminate &{+shift};
…		…
207	}, $class;	235	}, $class;
208	}	236	}
209		237
210	=item $process->ready	238	=item $process->ready
211		239
212	Put the current process into the ready queue.	240	Put the given process into the ready queue.
213		241
214	=cut	242	=cut
215		243
216	sub ready {	244	=item $process->cancel (arg...)
217	push @ready, $_[0];	245
		246	Temrinates the given process and makes it return the given arguments as
		247	status (default: the empty list).
		248
		249	=cut
		250
		251	sub cancel {
		252	my $self = shift;
		253	$self->{status} = [@_];
		254	push @destroy, $self;
		255	$manager->ready;
		256	&schedule if $current == $self;
		257	}
		258
		259	=item $process->join
		260
		261	Wait until the coroutine terminates and return any values given to the
		262	C<terminate> or C<cancel> functions. C<join> can be called multiple times
		263	from multiple processes.
		264
		265	=cut
		266
		267	sub join {
		268	my $self = shift;
		269	unless ($self->{status}) {
		270	push @{$self->{join}}, $current;
		271	&schedule;
		272	}
		273	wantarray ? @{$self->{status}} : $self->{status}[0];
		274	}
		275
		276	=item $oldprio = $process->prio($newprio)
		277
		278	Sets (or gets, if the argument is missing) the priority of the
		279	process. Higher priority processes get run before lower priority
		280	processes. Priorities are small signed integers (currently -4 .. +3),
		281	that you can refer to using PRIO_xxx constants (use the import tag :prio
		282	to get then):
		283
		284	PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN
		285	3 > 1 > 0 > -1 > -3 > -4
		286
		287	# set priority to HIGH
		288	current->prio(PRIO_HIGH);
		289
		290	The idle coroutine ($Coro::idle) always has a lower priority than any
		291	existing coroutine.
		292
		293	Changing the priority of the current process will take effect immediately,
		294	but changing the priority of processes in the ready queue (but not
		295	running) will only take effect after the next schedule (of that
		296	process). This is a bug that will be fixed in some future version.
		297
		298	=cut
		299
		300	sub prio {
		301	my $old = $_[0]{prio};
		302	$_[0]{prio} = $_[1] if @_ > 1;
		303	$old;
		304	}
		305
		306	=item $newprio = $process->nice($change)
		307
		308	Similar to C<prio>, but subtract the given value from the priority (i.e.
		309	higher values mean lower priority, just as in unix).
		310
		311	=cut
		312
		313	sub nice {
		314	$_[0]{prio} -= $_[1];
		315	}
		316
		317	=item $olddesc = $process->desc($newdesc)
		318
		319	Sets (or gets in case the argument is missing) the description for this
		320	process. This is just a free-form string you can associate with a process.
		321
		322	=cut
		323
		324	sub desc {
		325	my $old = $_[0]{desc};
		326	$_[0]{desc} = $_[1] if @_ > 1;
		327	$old;
218	}	328	}
219		329
220	=back	330	=back
221		331
222	=cut	332	=cut
223		333
224	1;	334	1;
225		335
226	=head1 BUGS	336	=head1 BUGS/LIMITATIONS
227		337
228	- could be faster, especially when the core would introduce special	338	- you must make very sure that no coro is still active on global
229	support for coroutines (like it does for threads).	339	destruction. very bad things might happen otherwise (usually segfaults).
230	- there is still a memleak on coroutine termination that I could not	340
231	identify. Could be as small as a single SV.	341	- this module is not thread-safe. You should only ever use this module
232	- this module is not well-tested.	342	from the same thread (this requirement might be losened in the future
		343	to allow per-thread schedulers, but Coro::State does not yet allow
		344	this).
233		345
234	=head1 SEE ALSO	346	=head1 SEE ALSO
235		347
236	L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,	348	Support/Utility: L<Coro::Cont>, L<Coro::Specific>, L<Coro::State>, L<Coro::Util>.
237	L<Coro::Signal>, L<Coro::State>, L<Coro::Event>.	349
		350	Locking/IPC: L<Coro::Signal>, L<Coro::Channel>, L<Coro::Semaphore>, L<Coro::SemaphoreSet>, L<Coro::RWLock>.
		351
		352	Event/IO: L<Coro::Timer>, L<Coro::Event>, L<Coro::Handle>, L<Coro::Socket>, L<Coro::Select>.
		353
		354	Embedding: L<Coro:MakeMaker>
238		355
239	=head1 AUTHOR	356	=head1 AUTHOR
240		357
241	Marc Lehmann <pcg@goof.com>	358	Marc Lehmann <schmorp@schmorp.de>
242	http://www.goof.com/pcg/marc/	359	http://home.schmorp.de/
243		360
244	=cut	361	=cut
245		362

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Comparing Coro/Coro.pm (file contents): Revision 1.14 by root, Tue Jul 17 02:21:56 2001 UTC vs. Revision 1.74 by root, Mon Dec 26 18:48:11 2005 UTC

Diff Legend

Comparing Coro/Coro.pm (file contents):
Revision 1.14 by root, Tue Jul 17 02:21:56 2001 UTC vs.
Revision 1.74 by root, Mon Dec 26 18:48:11 2005 UTC