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

Comparing cvsroot/Coro/Coro.pm (file contents):
Revision 1.32 by root, Sun Sep 2 01:03:53 2001 UTC vs.
Revision 1.40 by root, Sun Oct 28 17:00:05 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$VERSION = 0.49; 43$VERSION = 0.51;
42 44
43@EXPORT = qw(async cede schedule terminate current); 45@EXPORT = qw(async cede schedule terminate current);
44%EXPORT_TAGS = ( 46%EXPORT_TAGS = (
45 prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)], 47 prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)],
46); 48);
… …
114}; 116};
115 117
116# this coroutine is necessary because a coroutine 118# this coroutine is necessary because a coroutine
117# cannot destroy itself. 119# cannot destroy itself.
118my @destroy; 120my @destroy;
121my $manager;
119my $manager = new Coro sub { 122$manager = new Coro sub {
120 while() { 123 while() {
121 delete ((pop @destroy)->{_coro_state}) while @destroy; 124 # by overwriting the state object with the manager we destroy it
125 # while still being able to schedule this coroutine (in case it has
126 # been readied multiple times. this is harmless since the manager
127 # can be called as many times as neccessary and will always
128 # remove itself from the runqueue
129 while (@destroy) {
130 my $coro = pop @destroy;
131 $coro->{status} ||= [];
132 $_->ready for @{delete $coro->{join} || []};
133 $coro->{_coro_state} = $manager->{_coro_state};
134 }
122 &schedule; 135 &schedule;
123 } 136 }
124}; 137};
125 138
126# static methods. not really. 139# static methods. not really.
… …
168ready queue and calls C<schedule>, which has the effect of giving up the 181ready queue and calls C<schedule>, which has the effect of giving up the
169current "timeslice" to other coroutines of the same or higher priority. 182current "timeslice" to other coroutines of the same or higher priority.
170 183
171=cut 184=cut
172 185
173=item terminate 186=item terminate [arg...]
174 187
175Terminates the current process. 188Terminates the current process.
176 189
177Future versions of this function will allow result arguments. 190Future versions of this function will allow result arguments.
178 191
179=cut 192=cut
180 193
181sub terminate { 194sub terminate {
195 $current->{status} = [@_];
182 $current->cancel; 196 $current->cancel;
183 &schedule; 197 &schedule;
184 die; # NORETURN 198 die; # NORETURN
185} 199}
186 200
… …
195=over 4 209=over 4
196 210
197=item new Coro \&sub [, @args...] 211=item new Coro \&sub [, @args...]
198 212
199Create a new process and return it. When the sub returns the process 213Create a new process and return it. When the sub returns the process
200automatically terminates. To start the process you must first put it into 214automatically terminates as if C<terminate> with the returned values were
201the ready queue by calling the ready method. 215called. To start the process you must first put it into the ready queue by
216calling the ready method.
202 217
203The coderef you submit MUST NOT be a closure that refers to variables 218The coderef you submit MUST NOT be a closure that refers to variables
204in an outer scope. This does NOT work. Pass arguments into it instead. 219in an outer scope. This does NOT work. Pass arguments into it instead.
205 220
206=cut 221=cut
… …
216 }, $class; 231 }, $class;
217} 232}
218 233
219=item $process->ready 234=item $process->ready
220 235
221Put the current process into the ready queue. 236Put the given process into the ready queue.
222 237
223=cut 238=cut
224 239
225=item $process->cancel 240=item $process->cancel
226 241
… …
229=cut 244=cut
230 245
231sub cancel { 246sub cancel {
232 push @destroy, $_[0]; 247 push @destroy, $_[0];
233 $manager->ready; 248 $manager->ready;
249 &schedule if $current == $_[0];
250}
251
252=item $process->join
253
254Wait until the coroutine terminates and return any values given to the
255C<terminate> function. C<join> can be called multiple times from multiple
256processes.
257
258=cut
259
260sub join {
261 my $self = shift;
262 unless ($self->{status}) {
263 push @{$self->{join}}, $current;
264 &schedule;
265 }
266 wantarray ? @{$self->{status}} : $self->{status}[0];
234} 267}
235 268
236=item $oldprio = $process->prio($newprio) 269=item $oldprio = $process->prio($newprio)
237 270
238Sets the priority of the process. Higher priority processes get run before 271Sets the priority of the process. Higher priority processes get run before
… …
279 312
2801; 3131;
281 314
282=head1 BUGS/LIMITATIONS 315=head1 BUGS/LIMITATIONS
283 316
284 - could be faster, especially when the core would introduce special 317 - you must make very sure that no coro is still active on global destruction.
285 support for coroutines (like it does for threads). 318 very bad things might happen otherwise (usually segfaults).
286 - there is still a memleak on coroutine termination that I could not
287 identify. Could be as small as a single SV.
288 - this module is not well-tested.
289 - if variables or arguments "disappear" (become undef) or become
290 corrupted please contact the author so he cen iron out the
291 remaining bugs.
292 - this module is not thread-safe. You must only ever use this module from 319 - this module is not thread-safe. You must only ever use this module from
293 the same thread (this requirement might be loosened in the future to 320 the same thread (this requirement might be loosened in the future to
294 allow per-thread schedulers, but Coro::State does not yet allow this). 321 allow per-thread schedulers, but Coro::State does not yet allow this).
295 322
296=head1 SEE ALSO 323=head1 SEE ALSO

Diff Legend

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