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Comparing Coro/Coro.pm (file contents):
Revision 1.14 by root, Tue Jul 17 02:21:56 2001 UTC vs.
Revision 1.26 by root, Fri Jul 27 02:51:33 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 = 0.05; 41$VERSION = 0.12;
37 42
38@EXPORT = qw(async yield schedule terminate); 43@EXPORT = qw(async cede schedule terminate current);
39@EXPORT_OK = qw($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, $name, @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.
72 80
73=cut 81=cut
74 82
75our $main = new Coro; 83our $main = new Coro;
76 84
77=item $current 85=item $current (or as function: current)
78 86
79The current coroutine (the last coroutine switched to). The initial value is C<$main> (of course). 87The current coroutine (the last coroutine switched to). The initial value is C<$main> (of course).
80 88
81=cut 89=cut
82 90
… …
84if ($current) { 92if ($current) {
85 $main->{specific} = $current->{specific}; 93 $main->{specific} = $current->{specific};
86} 94}
87 95
88our $current = $main; 96our $current = $main;
97
98sub current() { $current }
89 99
90=item $idle 100=item $idle
91 101
92The coroutine to switch to when no other coroutine is running. The default 102The coroutine to switch to when no other coroutine is running. The default
93implementation prints "FATAL: deadlock detected" and exits. 103implementation prints "FATAL: deadlock detected" and exits.
… …
98our $idle = new Coro sub { 108our $idle = new Coro sub {
99 print STDERR "FATAL: deadlock detected\n"; 109 print STDERR "FATAL: deadlock detected\n";
100 exit(51); 110 exit(51);
101}; 111};
102 112
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
103# we really need priorities... 123# we really need priorities...
104## my @ready; #d#
105our @ready = (); # the ready queue. hehe, rather broken ;) 124my @ready; # the ready queue. hehe, rather broken ;)
106 125
107# static methods. not really. 126# static methods. not really.
108 127
109=head2 STATIC METHODS 128=head2 STATIC METHODS
110 129
… …
128 147
129=cut 148=cut
130 149
131sub async(&@) { 150sub async(&@) {
132 my $pid = new Coro @_; 151 my $pid = new Coro @_;
152 $manager->ready; # this ensures that the stack is cloned from the manager
133 $pid->ready; 153 $pid->ready;
134 $pid; 154 $pid;
135} 155}
136 156
137=item schedule 157=item schedule
… …
148 # should be done using priorities :( 168 # should be done using priorities :(
149 ($prev, $current) = ($current, shift @ready || $idle); 169 ($prev, $current) = ($current, shift @ready || $idle);
150 Coro::State::transfer($prev, $current); 170 Coro::State::transfer($prev, $current);
151} 171}
152 172
153=item yield 173=item cede
154 174
155Yield to other processes. This function puts the current process into the 175"Cede" to other processes. This function puts the current process into the
156ready 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.
157 178
158=cut 179=cut
159 180
160sub yield { 181sub cede {
161 $current->ready; 182 $current->ready;
162 &schedule; 183 &schedule;
163} 184}
164 185
165=item terminate 186=item terminate
… …
169Future versions of this function will allow result arguments. 190Future versions of this function will allow result arguments.
170 191
171=cut 192=cut
172 193
173sub terminate { 194sub terminate {
174 $current->{_results} = [@_]; 195 push @destroy, $current;
196 $manager->ready;
175 &schedule; 197 &schedule;
198 # NORETURN
176} 199}
177 200
178=back 201=back
179 202
180# dynamic methods 203# dynamic methods
… …
221 244
222=cut 245=cut
223 246
2241; 2471;
225 248
226=head1 BUGS 249=head1 BUGS/LIMITATIONS
227 250
228 - could be faster, especially when the core would introduce special 251 - could be faster, especially when the core would introduce special
229 support for coroutines (like it does for threads). 252 support for coroutines (like it does for threads).
230 - there is still a memleak on coroutine termination that I could not 253 - there is still a memleak on coroutine termination that I could not
231 identify. Could be as small as a single SV. 254 identify. Could be as small as a single SV.
232 - this module is not well-tested. 255 - this module is not well-tested.
256 - if variables or arguments "disappear" (become undef) or become
257 corrupted please contact the author so he cen iron out the
258 remaining bugs.
259 - this module is not thread-safe. You must only ever use this module from
260 the same thread (this requirement might be loosened in the future to
261 allow per-thread schedulers, but Coro::State does not yet allow this).
233 262
234=head1 SEE ALSO 263=head1 SEE ALSO
235 264
236L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>, 265L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,
237L<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>.
238 268
239=head1 AUTHOR 269=head1 AUTHOR
240 270
241 Marc Lehmann <pcg@goof.com> 271 Marc Lehmann <pcg@goof.com>
242 http://www.goof.com/pcg/marc/ 272 http://www.goof.com/pcg/marc/

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