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Comparing Coro/Coro.pm (file contents):
Revision 1.19 by root, Sat Jul 21 03:44:06 2001 UTC vs.
Revision 1.35 by root, Mon Sep 24 00:16:30 2001 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
23This module collection manages coroutines. Coroutines are similar to 23This module collection manages coroutines. Coroutines are similar to
24Threads but don't run in parallel. 24Threads but don't run in parallel.
25 25
26This module is still experimental, see the BUGS section below. 26This module is still experimental, see the BUGS section below.
27 27
28In this module, coroutines are defined as "callchain + lexical variables
29+ @_ + $_ + $@ + $^W + C stack), that is, a coroutine has it's own
30callchain, it's own set of lexicals and it's own set of perl's most
31important global variables.
32
28=cut 33=cut
29 34
30package Coro; 35package Coro;
31 36
32use Coro::State; 37use Coro::State;
33 38
34use base Exporter; 39use base Exporter;
35 40
36$VERSION = 0.09; 41$VERSION = 0.5;
37 42
38@EXPORT = qw(async yield schedule terminate current); 43@EXPORT = qw(async cede schedule terminate current);
39@EXPORT_OK = qw($current); 44%EXPORT_TAGS = (
45 prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],
46);
47@EXPORT_OK = @{$EXPORT_TAGS{prio}};
40 48
41{ 49{
42 use subs 'async';
43
44 my @async; 50 my @async;
51 my $init;
45 52
46 # this way of handling attributes simply is NOT scalable ;() 53 # this way of handling attributes simply is NOT scalable ;()
47 sub import { 54 sub import {
48 Coro->export_to_level(1, @_); 55 Coro->export_to_level(1, @_);
49 my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE}; 56 my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};
… …
51 my ($package, $ref) = (shift, shift); 58 my ($package, $ref) = (shift, shift);
52 my @attrs; 59 my @attrs;
53 for (@_) { 60 for (@_) {
54 if ($_ eq "Coro") { 61 if ($_ eq "Coro") {
55 push @async, $ref; 62 push @async, $ref;
63 unless ($init++) {
64 eval q{
65 sub INIT {
66 &async(pop @async) while @async;
67 }
68 };
69 }
56 } else { 70 } else {
57 push @attrs, $_; 71 push @attrs, $_;
58 } 72 }
59 } 73 }
60 return $old ? $old->($package, $ref, @attrs) : @attrs; 74 return $old ? $old->($package, $ref, @attrs) : @attrs;
61 }; 75 };
62 } 76 }
63 77
64 sub INIT {
65 async pop @async while @async;
66 }
67} 78}
68 79
69=item $main 80=item $main
70 81
71This coroutine represents the main program. 82This coroutine represents the main program.
… …
100our $idle = new Coro sub { 111our $idle = new Coro sub {
101 print STDERR "FATAL: deadlock detected\n"; 112 print STDERR "FATAL: deadlock detected\n";
102 exit(51); 113 exit(51);
103}; 114};
104 115
105# we really need priorities... 116# this coroutine is necessary because a coroutine
106my @ready; # the ready queue. hehe, rather broken ;) 117# cannot destroy itself.
118my @destroy;
119my $manager = new Coro sub {
120 while() {
121 delete ((pop @destroy)->{_coro_state}) while @destroy;
122 &schedule;
123 }
124};
107 125
108# static methods. not really. 126# static methods. not really.
109 127
110=head2 STATIC METHODS 128=head2 STATIC METHODS
111 129
… …
129 147
130=cut 148=cut
131 149
132sub async(&@) { 150sub async(&@) {
133 my $pid = new Coro @_; 151 my $pid = new Coro @_;
152 $manager->ready; # this ensures that the stack is cloned from the manager
134 $pid->ready; 153 $pid->ready;
135 $pid; 154 $pid;
136} 155}
137 156
138=item schedule 157=item schedule
… …
141into the ready queue, so calling this function usually means you will 160into the ready queue, so calling this function usually means you will
142never be called again. 161never be called again.
143 162
144=cut 163=cut
145 164
146my $prev;
147
148sub schedule {
149 # should be done using priorities :(
150 ($prev, $current) = ($current, shift @ready || $idle);
151 Coro::State::transfer($prev, $current);
152}
153
154=item yield 165=item cede
155 166
156Yield to other processes. This function puts the current process into the 167"Cede" to other processes. This function puts the current process into the
157ready queue and calls C<schedule>. 168ready queue and calls C<schedule>, which has the effect of giving up the
169current "timeslice" to other coroutines of the same or higher priority.
158 170
159=cut 171=cut
160 172
161sub yield { 173=item terminate
174
175Terminates the current process.
176
177Future versions of this function will allow result arguments.
178
179=cut
180
181sub terminate {
162 $current->ready; 182 $current->cancel;
163 &schedule; 183 &schedule;
164} 184 die; # NORETURN
165
166=item terminate
167
168Terminates the current process.
169
170Future versions of this function will allow result arguments.
171
172=cut
173
174sub terminate {
175 $current->{_results} = [@_];
176 &schedule;
177} 185}
178 186
179=back 187=back
180 188
181# dynamic methods 189# dynamic methods
… …
212 220
213Put the current process into the ready queue. 221Put the current process into the ready queue.
214 222
215=cut 223=cut
216 224
217sub ready { 225=item $process->cancel
226
227Like C<terminate>, but terminates the specified process instead.
228
229=cut
230
231sub cancel {
218 push @ready, $_[0]; 232 push @destroy, $_[0];
233 $manager->ready;
234 &schedule if $current == $_[0];
235}
236
237=item $oldprio = $process->prio($newprio)
238
239Sets the priority of the process. Higher priority processes get run before
240lower priority processes. Priorities are smalled signed integer (currently
241-4 .. +3), that you can refer to using PRIO_xxx constants (use the import
242tag :prio to get then):
243
244 PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN
245 3 > 1 > 0 > -1 > -3 > -4
246
247 # set priority to HIGH
248 current->prio(PRIO_HIGH);
249
250The idle coroutine ($Coro::idle) always has a lower priority than any
251existing coroutine.
252
253Changing the priority of the current process will take effect immediately,
254but changing the priority of processes in the ready queue (but not
255running) will only take effect after the next schedule (of that
256process). This is a bug that will be fixed in some future version.
257
258=cut
259
260sub prio {
261 my $old = $_[0]{prio};
262 $_[0]{prio} = $_[1] if @_ > 1;
263 $old;
264}
265
266=item $newprio = $process->nice($change)
267
268Similar to C<prio>, but subtract the given value from the priority (i.e.
269higher values mean lower priority, just as in unix).
270
271=cut
272
273sub nice {
274 $_[0]{prio} -= $_[1];
219} 275}
220 276
221=back 277=back
222 278
223=cut 279=cut
224 280
2251; 2811;
226 282
227=head1 BUGS/LIMITATIONS 283=head1 BUGS/LIMITATIONS
228 284
229 - could be faster, especially when the core would introduce special 285 - you must make very sure that no coro is still active on global destruction.
230 support for coroutines (like it does for threads). 286 very bad things might happen otherwise (usually segfaults).
231 - there is still a memleak on coroutine termination that I could not
232 identify. Could be as small as a single SV.
233 - this module is not well-tested.
234 - if variables or arguments "disappear" (become undef) or become
235 corrupted please contact the author so he cen iron out the
236 remaining bugs.
237 - this module is not thread-safe. You must only ever use this module from 287 - this module is not thread-safe. You must only ever use this module from
238 the same thread (this requirement might be loosened in the future to 288 the same thread (this requirement might be loosened in the future to
239 allow per-thread schedulers, but Coro::Satte does not yet allow this). 289 allow per-thread schedulers, but Coro::State does not yet allow this).
240 290
241=head1 SEE ALSO 291=head1 SEE ALSO
242 292
243L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>, 293L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,
244L<Coro::Signal>, L<Coro::State>, L<Coro::Event>. 294L<Coro::Signal>, L<Coro::State>, L<Coro::Event>, L<Coro::RWLock>,
295L<Coro::Handle>, L<Coro::Socket>.
245 296
246=head1 AUTHOR 297=head1 AUTHOR
247 298
248 Marc Lehmann <pcg@goof.com> 299 Marc Lehmann <pcg@goof.com>
249 http://www.goof.com/pcg/marc/ 300 http://www.goof.com/pcg/marc/

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