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Comparing Coro/Coro.pm (file contents):
Revision 1.20 by root, Sat Jul 21 18:21:45 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 28In this module, coroutines are defined as "callchain + lexical variables
29+ @_ + $_ + $@ + $^W), that is, a coroutine has it's own callchain, it's 29+ @_ + $_ + $@ + $^W + C stack), that is, a coroutine has it's own
30own set of lexicals and it's own set of perl's most important global 30callchain, it's own set of lexicals and it's own set of perl's most
31variables. 31important global variables.
32 32
33=cut 33=cut
34 34
35package Coro; 35package Coro;
36 36
37use Coro::State; 37use Coro::State;
38 38
39use base Exporter; 39use base Exporter;
40 40
41$VERSION = 0.10; 41$VERSION = 0.5;
42 42
43@EXPORT = qw(async yield schedule terminate current); 43@EXPORT = qw(async cede schedule terminate current);
44@EXPORT_OK = qw($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}};
45 48
46{ 49{
47 my @async; 50 my @async;
51 my $init;
48 52
49 # this way of handling attributes simply is NOT scalable ;() 53 # this way of handling attributes simply is NOT scalable ;()
50 sub import { 54 sub import {
51 Coro->export_to_level(1, @_); 55 Coro->export_to_level(1, @_);
52 my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE}; 56 my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};
… …
54 my ($package, $ref) = (shift, shift); 58 my ($package, $ref) = (shift, shift);
55 my @attrs; 59 my @attrs;
56 for (@_) { 60 for (@_) {
57 if ($_ eq "Coro") { 61 if ($_ eq "Coro") {
58 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 }
59 } else { 70 } else {
60 push @attrs, $_; 71 push @attrs, $_;
61 } 72 }
62 } 73 }
63 return $old ? $old->($package, $ref, @attrs) : @attrs; 74 return $old ? $old->($package, $ref, @attrs) : @attrs;
64 }; 75 };
65 } 76 }
66 77
67 sub INIT {
68 &async(pop @async) while @async;
69 }
70} 78}
71 79
72=item $main 80=item $main
73 81
74This coroutine represents the main program. 82This coroutine represents the main program.
… …
103our $idle = new Coro sub { 111our $idle = new Coro sub {
104 print STDERR "FATAL: deadlock detected\n"; 112 print STDERR "FATAL: deadlock detected\n";
105 exit(51); 113 exit(51);
106}; 114};
107 115
108# we really need priorities... 116# this coroutine is necessary because a coroutine
109my @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};
110 125
111# static methods. not really. 126# static methods. not really.
112 127
113=head2 STATIC METHODS 128=head2 STATIC METHODS
114 129
… …
132 147
133=cut 148=cut
134 149
135sub async(&@) { 150sub async(&@) {
136 my $pid = new Coro @_; 151 my $pid = new Coro @_;
152 $manager->ready; # this ensures that the stack is cloned from the manager
137 $pid->ready; 153 $pid->ready;
138 $pid; 154 $pid;
139} 155}
140 156
141=item schedule 157=item schedule
… …
144into the ready queue, so calling this function usually means you will 160into the ready queue, so calling this function usually means you will
145never be called again. 161never be called again.
146 162
147=cut 163=cut
148 164
149my $prev;
150
151sub schedule {
152 # should be done using priorities :(
153 ($prev, $current) = ($current, shift @ready || $idle);
154 Coro::State::transfer($prev, $current);
155}
156
157=item yield 165=item cede
158 166
159Yield to other processes. This function puts the current process into the 167"Cede" to other processes. This function puts the current process into the
160ready 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.
161 170
162=cut 171=cut
163 172
164sub 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 {
165 $current->ready; 182 $current->cancel;
166 &schedule; 183 &schedule;
167} 184 die; # NORETURN
168
169=item terminate
170
171Terminates the current process.
172
173Future versions of this function will allow result arguments.
174
175=cut
176
177sub terminate {
178 $current->{_results} = [@_];
179 &schedule;
180} 185}
181 186
182=back 187=back
183 188
184# dynamic methods 189# dynamic methods
… …
215 220
216Put the current process into the ready queue. 221Put the current process into the ready queue.
217 222
218=cut 223=cut
219 224
220sub ready { 225=item $process->cancel
226
227Like C<terminate>, but terminates the specified process instead.
228
229=cut
230
231sub cancel {
221 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];
222} 275}
223 276
224=back 277=back
225 278
226=cut 279=cut
227 280
2281; 2811;
229 282
230=head1 BUGS/LIMITATIONS 283=head1 BUGS/LIMITATIONS
231 284
232 - 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.
233 support for coroutines (like it does for threads). 286 very bad things might happen otherwise (usually segfaults).
234 - there is still a memleak on coroutine termination that I could not
235 identify. Could be as small as a single SV.
236 - this module is not well-tested.
237 - if variables or arguments "disappear" (become undef) or become
238 corrupted please contact the author so he cen iron out the
239 remaining bugs.
240 - 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
241 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
242 allow per-thread schedulers, but Coro::State does not yet allow this). 289 allow per-thread schedulers, but Coro::State does not yet allow this).
243 290
244=head1 SEE ALSO 291=head1 SEE ALSO
245 292
246L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>, 293L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,
247L<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>.
248 296
249=head1 AUTHOR 297=head1 AUTHOR
250 298
251 Marc Lehmann <pcg@goof.com> 299 Marc Lehmann <pcg@goof.com>
252 http://www.goof.com/pcg/marc/ 300 http://www.goof.com/pcg/marc/

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