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Comparing Coro/Coro.pm (file contents):
Revision 1.16 by root, Tue Jul 17 15:42:28 2001 UTC vs.
Revision 1.24 by root, Wed Jul 25 04:14:37 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 = 0.07; 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($current);
40 45
41{ 46{
42 use subs 'async';
43
44 my @async; 47 my @async;
45 48
46 # this way of handling attributes simply is NOT scalable ;() 49 # this way of handling attributes simply is NOT scalable ;()
47 sub import { 50 sub import {
48 Coro->export_to_level(1, @_); 51 Coro->export_to_level(1, @_);
… …
52 my @attrs; 55 my @attrs;
53 for (@_) { 56 for (@_) {
54 if ($_ eq "Coro") { 57 if ($_ eq "Coro") {
55 push @async, $ref; 58 push @async, $ref;
56 } else { 59 } else {
57 push @attrs, @_; 60 push @attrs, $_;
58 } 61 }
59 } 62 }
60 return $old ? $old->($package, $name, @attrs) : @attrs; 63 return $old ? $old->($package, $ref, @attrs) : @attrs;
61 }; 64 };
62 } 65 }
63 66
64 sub INIT { 67 sub INIT {
65 async pop @async while @async; 68 &async(pop @async) while @async;
66 } 69 }
67} 70}
68 71
69=item $main 72=item $main
70 73
… …
72 75
73=cut 76=cut
74 77
75our $main = new Coro; 78our $main = new Coro;
76 79
77=item $current 80=item $current (or as function: current)
78 81
79The current coroutine (the last coroutine switched to). The initial value is C<$main> (of course). 82The current coroutine (the last coroutine switched to). The initial value is C<$main> (of course).
80 83
81=cut 84=cut
82 85
… …
84if ($current) { 87if ($current) {
85 $main->{specific} = $current->{specific}; 88 $main->{specific} = $current->{specific};
86} 89}
87 90
88our $current = $main; 91our $current = $main;
92
93sub current() { $current }
89 94
90=item $idle 95=item $idle
91 96
92The coroutine to switch to when no other coroutine is running. The default 97The coroutine to switch to when no other coroutine is running. The default
93implementation prints "FATAL: deadlock detected" and exits. 98implementation prints "FATAL: deadlock detected" and exits.
… …
98our $idle = new Coro sub { 103our $idle = new Coro sub {
99 print STDERR "FATAL: deadlock detected\n"; 104 print STDERR "FATAL: deadlock detected\n";
100 exit(51); 105 exit(51);
101}; 106};
102 107
108# this coroutine is necessary because a coroutine
109# cannot destroy itself.
110my @destroy;
111my $manager = new Coro sub {
112 while() {
113 delete ((pop @destroy)->{_coro_state}) while @destroy;
114 &schedule;
115 }
116};
117
103# we really need priorities... 118# we really need priorities...
104my @ready; # the ready queue. hehe, rather broken ;) 119my @ready; # the ready queue. hehe, rather broken ;)
105 120
106# static methods. not really. 121# static methods. not really.
107 122
… …
127 142
128=cut 143=cut
129 144
130sub async(&@) { 145sub async(&@) {
131 my $pid = new Coro @_; 146 my $pid = new Coro @_;
147 $manager->ready; # this ensures that the stack is cloned from the manager
132 $pid->ready; 148 $pid->ready;
133 $pid; 149 $pid;
134} 150}
135 151
136=item schedule 152=item schedule
… …
147 # should be done using priorities :( 163 # should be done using priorities :(
148 ($prev, $current) = ($current, shift @ready || $idle); 164 ($prev, $current) = ($current, shift @ready || $idle);
149 Coro::State::transfer($prev, $current); 165 Coro::State::transfer($prev, $current);
150} 166}
151 167
152=item yield 168=item cede
153 169
154Yield to other processes. This function puts the current process into the 170"Cede" to other processes. This function puts the current process into the
155ready queue and calls C<schedule>. 171ready queue and calls C<schedule>, which has the effect of giving up the
172current "timeslice" to other coroutines of the same or higher priority.
156 173
157=cut 174=cut
158 175
159sub yield { 176sub cede {
160 $current->ready; 177 $current->ready;
161 &schedule; 178 &schedule;
162} 179}
163 180
164=item terminate 181=item terminate
… …
168Future versions of this function will allow result arguments. 185Future versions of this function will allow result arguments.
169 186
170=cut 187=cut
171 188
172sub terminate { 189sub terminate {
173 $current->{_results} = [@_]; 190 push @destroy, $current;
191 $manager->ready;
174 &schedule; 192 &schedule;
193 # NORETURN
175} 194}
176 195
177=back 196=back
178 197
179# dynamic methods 198# dynamic methods
… …
220 239
221=cut 240=cut
222 241
2231; 2421;
224 243
225=head1 BUGS 244=head1 BUGS/LIMITATIONS
226 245
227 - could be faster, especially when the core would introduce special 246 - could be faster, especially when the core would introduce special
228 support for coroutines (like it does for threads). 247 support for coroutines (like it does for threads).
229 - there is still a memleak on coroutine termination that I could not 248 - there is still a memleak on coroutine termination that I could not
230 identify. Could be as small as a single SV. 249 identify. Could be as small as a single SV.
231 - this module is not well-tested. 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
255 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).
232 257
233=head1 SEE ALSO 258=head1 SEE ALSO
234 259
235L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>, 260L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,
236L<Coro::Signal>, L<Coro::State>, L<Coro::Event>. 261L<Coro::Signal>, L<Coro::State>, L<Coro::Event>.

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