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Revision 1.9 by root, Sun Jul 15 02:35:52 2001 UTC vs.
Revision 1.20 by root, Sat Jul 21 18:21:45 2001 UTC

… …
18 18
19 yield; 19 yield;
20 20
21=head1 DESCRIPTION 21=head1 DESCRIPTION
22 22
23This module collection manages coroutines. Coroutines are similar to
24Threads but don't run in parallel.
25
26This module is still experimental, see the BUGS section below.
27
28In this module, coroutines are defined as "callchain + lexical variables
29+ @_ + $_ + $@ + $^W), that is, a coroutine has it's own callchain, it's
30own set of lexicals and it's own set of perl's most important global
31variables.
32
23=cut 33=cut
24 34
25package Coro; 35package Coro;
26 36
27use Coro::State; 37use Coro::State;
28 38
29use base Exporter; 39use base Exporter;
30 40
31$VERSION = 0.04; 41$VERSION = 0.10;
32 42
33@EXPORT = qw(async yield schedule); 43@EXPORT = qw(async yield schedule terminate current);
34@EXPORT_OK = qw($current); 44@EXPORT_OK = qw($current);
35 45
36{ 46{
37 use subs 'async';
38
39 my @async; 47 my @async;
40 48
41 # this way of handling attributes simply is NOT scalable ;() 49 # this way of handling attributes simply is NOT scalable ;()
42 sub import { 50 sub import {
43 Coro->export_to_level(1, @_); 51 Coro->export_to_level(1, @_);
… …
47 my @attrs; 55 my @attrs;
48 for (@_) { 56 for (@_) {
49 if ($_ eq "Coro") { 57 if ($_ eq "Coro") {
50 push @async, $ref; 58 push @async, $ref;
51 } else { 59 } else {
52 push @attrs, @_; 60 push @attrs, $_;
53 } 61 }
54 } 62 }
55 return $old ? $old->($package, $name, @attrs) : @attrs; 63 return $old ? $old->($package, $ref, @attrs) : @attrs;
56 }; 64 };
57 } 65 }
58 66
59 sub INIT { 67 sub INIT {
60 async pop @async while @async; 68 &async(pop @async) while @async;
61 } 69 }
62} 70}
63 71
64=item $main 72=item $main
65 73
… …
67 75
68=cut 76=cut
69 77
70our $main = new Coro; 78our $main = new Coro;
71 79
72=item $current 80=item $current (or as function: current)
73 81
74The current coroutine (the last coroutine switched to). The initial value is C<$main> (of course). 82The current coroutine (the last coroutine switched to). The initial value is C<$main> (of course).
75 83
76=cut 84=cut
77 85
… …
79if ($current) { 87if ($current) {
80 $main->{specific} = $current->{specific}; 88 $main->{specific} = $current->{specific};
81} 89}
82 90
83our $current = $main; 91our $current = $main;
92
93sub current() { $current }
84 94
85=item $idle 95=item $idle
86 96
87The 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
88implementation prints "FATAL: deadlock detected" and exits. 98implementation prints "FATAL: deadlock detected" and exits.
… …
94 print STDERR "FATAL: deadlock detected\n"; 104 print STDERR "FATAL: deadlock detected\n";
95 exit(51); 105 exit(51);
96}; 106};
97 107
98# we really need priorities... 108# we really need priorities...
99my @ready = (); # the ready queue. hehe, rather broken ;) 109my @ready; # the ready queue. hehe, rather broken ;)
100 110
101# static methods. not really. 111# static methods. not really.
102 112
103=head2 STATIC METHODS 113=head2 STATIC METHODS
104 114
105Static methods are actually functions that operate on the current process only. 115Static methods are actually functions that operate on the current process only.
106 116
107=over 4 117=over 4
108 118
109=item async { ... }; 119=item async { ... } [@args...]
110 120
111Create a new asynchronous process and return it's process object 121Create a new asynchronous process and return it's process object
112(usually unused). When the sub returns the new process is automatically 122(usually unused). When the sub returns the new process is automatically
113terminated. 123terminated.
114 124
115=cut 125 # create a new coroutine that just prints its arguments
126 async {
127 print "@_\n";
128 } 1,2,3,4;
116 129
130The coderef you submit MUST NOT be a closure that refers to variables
131in an outer scope. This does NOT work. Pass arguments into it instead.
132
133=cut
134
117sub async(&) { 135sub async(&@) {
118 (new Coro $_[0])->ready; 136 my $pid = new Coro @_;
137 $pid->ready;
138 $pid;
119} 139}
120 140
121=item schedule 141=item schedule
122 142
123Calls the scheduler. Please note that the current process will not be put 143Calls the scheduler. Please note that the current process will not be put
… …
148 168
149=item terminate 169=item terminate
150 170
151Terminates the current process. 171Terminates the current process.
152 172
173Future versions of this function will allow result arguments.
174
153=cut 175=cut
154 176
155sub terminate { 177sub terminate {
178 $current->{_results} = [@_];
156 &schedule; 179 &schedule;
157} 180}
158 181
159=back 182=back
160 183
… …
164 187
165These are the methods you can call on process objects. 188These are the methods you can call on process objects.
166 189
167=over 4 190=over 4
168 191
169=item new Coro \&sub; 192=item new Coro \&sub [, @args...]
170 193
171Create a new process and return it. When the sub returns the process 194Create a new process and return it. When the sub returns the process
172automatically terminates. To start the process you must first put it into 195automatically terminates. To start the process you must first put it into
173the ready queue by calling the ready method. 196the ready queue by calling the ready method.
174 197
198The coderef you submit MUST NOT be a closure that refers to variables
199in an outer scope. This does NOT work. Pass arguments into it instead.
200
175=cut 201=cut
202
203sub _newcoro {
204 terminate &{+shift};
205}
176 206
177sub new { 207sub new {
178 my $class = shift; 208 my $class = shift;
179 my $proc = $_[0];
180 bless { 209 bless {
181 _coro_state => new Coro::State ($proc ? sub { &$proc; &terminate } : $proc), 210 _coro_state => (new Coro::State $_[0] && \&_newcoro, @_),
182 }, $class; 211 }, $class;
183} 212}
184 213
185=item $process->ready 214=item $process->ready
186 215
… …
196 225
197=cut 226=cut
198 227
1991; 2281;
200 229
230=head1 BUGS/LIMITATIONS
231
232 - could be faster, especially when the core would introduce special
233 support for coroutines (like it does for threads).
234 - there is still a memleak on coroutine termination that I could not
235 identify. Could be as small as a single SV.
236 - this module is not well-tested.
237 - if variables or arguments "disappear" (become undef) or become
238 corrupted please contact the author so he cen iron out the
239 remaining bugs.
240 - this module is not thread-safe. You must only ever use this module from
241 the same thread (this requirement might be loosened in the future to
242 allow per-thread schedulers, but Coro::State does not yet allow this).
243
201=head1 SEE ALSO 244=head1 SEE ALSO
202 245
203L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>, 246L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>,
204L<Coro::Signal>, L<Coro::State>. 247L<Coro::Signal>, L<Coro::State>, L<Coro::Event>.
205 248
206=head1 AUTHOR 249=head1 AUTHOR
207 250
208 Marc Lehmann <pcg@goof.com> 251 Marc Lehmann <pcg@goof.com>
209 http://www.goof.com/pcg/marc/ 252 http://www.goof.com/pcg/marc/

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