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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 1.27 by root, Sat Jul 28 01:41:57 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$VERSION = 0.13;
37 42
38@EXPORT = qw(async yield schedule terminate current); 43@EXPORT = qw(async cede schedule terminate current);
39@EXPORT_OK = qw($current); 44@EXPORT_OK = qw($current);
40 45
41{ 46{
42 use subs 'async';
43
44 my @async; 47 my @async;
48 my $init;
45 49
46 # this way of handling attributes simply is NOT scalable ;() 50 # this way of handling attributes simply is NOT scalable ;()
47 sub import { 51 sub import {
48 Coro->export_to_level(1, @_); 52 Coro->export_to_level(1, @_);
49 my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE}; 53 my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE};
… …
51 my ($package, $ref) = (shift, shift); 55 my ($package, $ref) = (shift, shift);
52 my @attrs; 56 my @attrs;
53 for (@_) { 57 for (@_) {
54 if ($_ eq "Coro") { 58 if ($_ eq "Coro") {
55 push @async, $ref; 59 push @async, $ref;
60 unless ($init++) {
61 eval q{
62 sub INIT {
63 &async(pop @async) while @async;
64 }
65 };
66 }
56 } else { 67 } else {
57 push @attrs, $_; 68 push @attrs, $_;
58 } 69 }
59 } 70 }
60 return $old ? $old->($package, $ref, @attrs) : @attrs; 71 return $old ? $old->($package, $ref, @attrs) : @attrs;
61 }; 72 };
62 } 73 }
63 74
64 sub INIT {
65 async pop @async while @async;
66 }
67} 75}
68 76
69=item $main 77=item $main
70 78
71This coroutine represents the main program. 79This coroutine represents the main program.
… …
100our $idle = new Coro sub { 108our $idle = new Coro sub {
101 print STDERR "FATAL: deadlock detected\n"; 109 print STDERR "FATAL: deadlock detected\n";
102 exit(51); 110 exit(51);
103}; 111};
104 112
113# this coroutine is necessary because a coroutine
114# cannot destroy itself.
115my @destroy;
116my $manager = new Coro sub {
117 while() {
118 delete ((pop @destroy)->{_coro_state}) while @destroy;
119 &schedule;
120 }
121};
122
105# we really need priorities... 123# we really need priorities...
106my @ready; # the ready queue. hehe, rather broken ;) 124my @ready; # the ready queue. hehe, rather broken ;)
107 125
108# static methods. not really. 126# static methods. not really.
109 127
… …
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 $pid;
136} 155}
137 156
138=item schedule 157=item schedule
… …
149 # should be done using priorities :( 168 # should be done using priorities :(
150 ($prev, $current) = ($current, shift @ready || $idle); 169 ($prev, $current) = ($current, shift @ready || $idle);
151 Coro::State::transfer($prev, $current); 170 Coro::State::transfer($prev, $current);
152} 171}
153 172
154=item yield 173=item cede
155 174
156Yield to other processes. This function puts the current process into the 175"Cede" to other processes. This function puts the current process into the
157ready queue and calls C<schedule>. 176ready queue and calls C<schedule>, which has the effect of giving up the
177current "timeslice" to other coroutines of the same or higher priority.
158 178
159=cut 179=cut
160 180
161sub yield { 181sub cede {
162 $current->ready; 182 $current->ready;
163 &schedule; 183 &schedule;
164} 184}
165 185
166=item terminate 186=item terminate
… …
170Future versions of this function will allow result arguments. 190Future versions of this function will allow result arguments.
171 191
172=cut 192=cut
173 193
174sub terminate { 194sub terminate {
175 $current->{_results} = [@_]; 195 push @destroy, $current;
196 $manager->ready;
176 &schedule; 197 &schedule;
198 # NORETURN
177} 199}
178 200
179=back 201=back
180 202
181# dynamic methods 203# dynamic methods
… …
234 - if variables or arguments "disappear" (become undef) or become 256 - if variables or arguments "disappear" (become undef) or become
235 corrupted please contact the author so he cen iron out the 257 corrupted please contact the author so he cen iron out the
236 remaining bugs. 258 remaining bugs.
237 - this module is not thread-safe. You must only ever use this module from 259 - 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 260 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). 261 allow per-thread schedulers, but Coro::State does not yet allow this).
240 262
241=head1 SEE ALSO 263=head1 SEE ALSO
242 264
243L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>, 265L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,
244L<Coro::Signal>, L<Coro::State>, L<Coro::Event>. 266L<Coro::Signal>, L<Coro::State>, L<Coro::Event>, L<Coro::RWLock>,
267L<Coro::Handle>, L<Coro::Socket>.
245 268
246=head1 AUTHOR 269=head1 AUTHOR
247 270
248 Marc Lehmann <pcg@goof.com> 271 Marc Lehmann <pcg@goof.com>
249 http://www.goof.com/pcg/marc/ 272 http://www.goof.com/pcg/marc/

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