ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/Coro/Coro.pm
(Generate patch)

Comparing Coro/Coro.pm (file contents):
Revision 1.24 by root, Wed Jul 25 04:14:37 2001 UTC vs.
Revision 1.36 by root, Mon Sep 24 01:36:20 2001 UTC

… …
32 32
33=cut 33=cut
34 34
35package Coro; 35package Coro;
36 36
37no warnings qw(uninitialized);
38
37use Coro::State; 39use Coro::State;
38 40
39use base Exporter; 41use base Exporter;
40 42
41$VERSION = 0.12; 43$VERSION = 0.5;
42 44
43@EXPORT = qw(async cede schedule terminate current); 45@EXPORT = qw(async cede schedule terminate current);
44@EXPORT_OK = qw($current); 46%EXPORT_TAGS = (
47 prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],
48);
49@EXPORT_OK = @{$EXPORT_TAGS{prio}};
45 50
46{ 51{
47 my @async; 52 my @async;
53 my $init;
48 54
49 # this way of handling attributes simply is NOT scalable ;() 55 # this way of handling attributes simply is NOT scalable ;()
50 sub import { 56 sub import {
51 Coro->export_to_level(1, @_); 57 Coro->export_to_level(1, @_);
52 my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE}; 58 my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};
… …
54 my ($package, $ref) = (shift, shift); 60 my ($package, $ref) = (shift, shift);
55 my @attrs; 61 my @attrs;
56 for (@_) { 62 for (@_) {
57 if ($_ eq "Coro") { 63 if ($_ eq "Coro") {
58 push @async, $ref; 64 push @async, $ref;
65 unless ($init++) {
66 eval q{
67 sub INIT {
68 &async(pop @async) while @async;
69 }
70 };
71 }
59 } else { 72 } else {
60 push @attrs, $_; 73 push @attrs, $_;
61 } 74 }
62 } 75 }
63 return $old ? $old->($package, $ref, @attrs) : @attrs; 76 return $old ? $old->($package, $ref, @attrs) : @attrs;
64 }; 77 };
65 } 78 }
66 79
67 sub INIT {
68 &async(pop @async) while @async;
69 }
70} 80}
71 81
72=item $main 82=item $main
73 83
74This coroutine represents the main program. 84This coroutine represents the main program.
… …
113 delete ((pop @destroy)->{_coro_state}) while @destroy; 123 delete ((pop @destroy)->{_coro_state}) while @destroy;
114 &schedule; 124 &schedule;
115 } 125 }
116}; 126};
117 127
118# we really need priorities...
119my @ready; # the ready queue. hehe, rather broken ;)
120
121# static methods. not really. 128# static methods. not really.
122 129
123=head2 STATIC METHODS 130=head2 STATIC METHODS
124 131
125Static methods are actually functions that operate on the current process only. 132Static methods are actually functions that operate on the current process only.
… …
155into the ready queue, so calling this function usually means you will 162into the ready queue, so calling this function usually means you will
156never be called again. 163never be called again.
157 164
158=cut 165=cut
159 166
160my $prev;
161
162sub schedule {
163 # should be done using priorities :(
164 ($prev, $current) = ($current, shift @ready || $idle);
165 Coro::State::transfer($prev, $current);
166}
167
168=item cede 167=item cede
169 168
170"Cede" to other processes. This function puts the current process into the 169"Cede" to other processes. This function puts the current process into the
171ready queue and calls C<schedule>, which has the effect of giving up the 170ready queue and calls C<schedule>, which has the effect of giving up the
172current "timeslice" to other coroutines of the same or higher priority. 171current "timeslice" to other coroutines of the same or higher priority.
173 172
174=cut 173=cut
175 174
176sub cede { 175=item terminate
176
177Terminates the current process.
178
179Future versions of this function will allow result arguments.
180
181=cut
182
183sub terminate {
177 $current->ready; 184 $current->cancel;
178 &schedule; 185 &schedule;
179}
180
181=item terminate
182
183Terminates the current process.
184
185Future versions of this function will allow result arguments.
186
187=cut
188
189sub terminate {
190 push @destroy, $current;
191 $manager->ready;
192 &schedule;
193 # NORETURN 186 die; # NORETURN
194} 187}
195 188
196=back 189=back
197 190
198# dynamic methods 191# dynamic methods
… …
229 222
230Put the current process into the ready queue. 223Put the current process into the ready queue.
231 224
232=cut 225=cut
233 226
234sub ready { 227=item $process->cancel
228
229Like C<terminate>, but terminates the specified process instead.
230
231=cut
232
233sub cancel {
235 push @ready, $_[0]; 234 push @destroy, $_[0];
235 $manager->ready;
236 &schedule if $current == $_[0];
237}
238
239=item $oldprio = $process->prio($newprio)
240
241Sets the priority of the process. Higher priority processes get run before
242lower priority processes. Priorities are smalled signed integer (currently
243-4 .. +3), that you can refer to using PRIO_xxx constants (use the import
244tag :prio to get then):
245
246 PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN
247 3 > 1 > 0 > -1 > -3 > -4
248
249 # set priority to HIGH
250 current->prio(PRIO_HIGH);
251
252The idle coroutine ($Coro::idle) always has a lower priority than any
253existing coroutine.
254
255Changing the priority of the current process will take effect immediately,
256but changing the priority of processes in the ready queue (but not
257running) will only take effect after the next schedule (of that
258process). This is a bug that will be fixed in some future version.
259
260=cut
261
262sub prio {
263 my $old = $_[0]{prio};
264 $_[0]{prio} = $_[1] if @_ > 1;
265 $old;
266}
267
268=item $newprio = $process->nice($change)
269
270Similar to C<prio>, but subtract the given value from the priority (i.e.
271higher values mean lower priority, just as in unix).
272
273=cut
274
275sub nice {
276 $_[0]{prio} -= $_[1];
236} 277}
237 278
238=back 279=back
239 280
240=cut 281=cut
241 282
2421; 2831;
243 284
244=head1 BUGS/LIMITATIONS 285=head1 BUGS/LIMITATIONS
245 286
246 - could be faster, especially when the core would introduce special 287 - you must make very sure that no coro is still active on global destruction.
247 support for coroutines (like it does for threads). 288 very bad things might happen otherwise (usually segfaults).
248 - there is still a memleak on coroutine termination that I could not
249 identify. Could be as small as a single SV.
250 - this module is not well-tested.
251 - if variables or arguments "disappear" (become undef) or become
252 corrupted please contact the author so he cen iron out the
253 remaining bugs.
254 - this module is not thread-safe. You must only ever use this module from 289 - this module is not thread-safe. You must only ever use this module from
255 the same thread (this requirement might be loosened in the future to 290 the same thread (this requirement might be loosened in the future to
256 allow per-thread schedulers, but Coro::State does not yet allow this). 291 allow per-thread schedulers, but Coro::State does not yet allow this).
257 292
258=head1 SEE ALSO 293=head1 SEE ALSO
259 294
260L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>, 295L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,
261L<Coro::Signal>, L<Coro::State>, L<Coro::Event>. 296L<Coro::Signal>, L<Coro::State>, L<Coro::Event>, L<Coro::RWLock>,
297L<Coro::Handle>, L<Coro::Socket>.
262 298
263=head1 AUTHOR 299=head1 AUTHOR
264 300
265 Marc Lehmann <pcg@goof.com> 301 Marc Lehmann <pcg@goof.com>
266 http://www.goof.com/pcg/marc/ 302 http://www.goof.com/pcg/marc/

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines