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Comparing Coro/Coro.pm (file contents):
Revision 1.21 by root, Sun Jul 22 03:24:10 2001 UTC vs.
Revision 1.22 by root, Mon Jul 23 02:14:19 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.
… …
34coroutines are still running OR just call exit before falling off the 34coroutines are still running OR just call exit before falling off the
35end. The reason for this is that some coroutine of yours might have called 35end. The reason for this is that some coroutine of yours might have called
36into a C function, and falling off the end of main:: results in returning 36into a C function, and falling off the end of main:: results in returning
37to that C function instead if to the main C interpreter. 37to that C function instead if to the main C interpreter.
38 38
39WARNING: Unless you really know what you are doing, do NOT do context
40switches inside callbacks from the XS level. The reason for this is
41similar to the reason above: A callback calls a perl function, this
42perl function does a context switch, some other callback is called, the
43original function returns from it - to what? To the wrong XS function,
44with totally different return values. Unfortunately, this includes
45callbacks done by perl itself (tie'd variables!).
46
47The only workaround for this is to do coroutines on C level.
48
39=cut 49=cut
40 50
41package Coro; 51package Coro;
42 52
43use Coro::State; 53use Coro::State;
44 54
45use base Exporter; 55use base Exporter;
46 56
47$VERSION = 0.10; 57$VERSION = 0.10;
48 58
49@EXPORT = qw(async yield schedule terminate current); 59@EXPORT = qw(async cede schedule terminate current);
50@EXPORT_OK = qw($current); 60@EXPORT_OK = qw($current);
51 61
52{ 62{
53 my @async; 63 my @async;
54 64
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158 # should be done using priorities :( 168 # should be done using priorities :(
159 ($prev, $current) = ($current, shift @ready || $idle); 169 ($prev, $current) = ($current, shift @ready || $idle);
160 Coro::State::transfer($prev, $current); 170 Coro::State::transfer($prev, $current);
161} 171}
162 172
163=item yield 173=item cede
164 174
165Yield to other processes. This function puts the current process into the 175"Cede" to other processes. This function puts the current process into the
166ready 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.
167 178
168=cut 179=cut
169 180
170sub yield { 181sub cede {
171 $current->ready; 182 $current->ready;
172 &schedule; 183 &schedule;
173} 184}
174 185
175=item terminate 186=item terminate
… …
179Future versions of this function will allow result arguments. 190Future versions of this function will allow result arguments.
180 191
181=cut 192=cut
182 193
183sub terminate { 194sub terminate {
195 my $self = $current;
184 $current->{_results} = [@_]; 196 $self->{_results} = [@_];
185 delete $current->{_coro_state}; 197 $current = shift @ready || $idle;
186 &schedule; 198 Coro::State::transfer(delete $self->{_coro_state}, $current);
199 # cannot return
200 die;
187} 201}
188 202
189=back 203=back
190 204
191# dynamic methods 205# dynamic methods

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