… | |
… | |
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 | |
23 | This module collection manages coroutines. Coroutines are similar to |
23 | This module collection manages coroutines. Coroutines are similar to |
24 | Threads but don't run in parallel. |
24 | Threads but don't run in parallel. |
25 | |
25 | |
26 | This module is still experimental, see the BUGS section below. |
26 | This module is still experimental, see the BUGS section below. |
27 | |
27 | |
28 | In this module, coroutines are defined as "callchain + lexical variables |
28 | In this module, coroutines are defined as "callchain + lexical variables |
29 | + @_ + $_ + $@ + $^W), that is, a coroutine has it's own callchain, it's |
29 | + @_ + $_ + $@ + $^W + C stack), that is, a coroutine has it's own |
30 | own set of lexicals and it's own set of perl's most important global |
30 | callchain, it's own set of lexicals and it's own set of perl's most |
31 | variables. |
31 | important global variables. |
32 | |
32 | |
33 | =cut |
33 | =cut |
34 | |
34 | |
35 | package Coro; |
35 | package Coro; |
36 | |
36 | |
… | |
… | |
38 | |
38 | |
39 | use base Exporter; |
39 | use base Exporter; |
40 | |
40 | |
41 | $VERSION = 0.10; |
41 | $VERSION = 0.10; |
42 | |
42 | |
43 | @EXPORT = qw(async yield schedule terminate current); |
43 | @EXPORT = qw(async cede schedule terminate current); |
44 | @EXPORT_OK = qw($current); |
44 | @EXPORT_OK = qw($current); |
45 | |
45 | |
46 | { |
46 | { |
47 | my @async; |
47 | my @async; |
48 | |
48 | |
… | |
… | |
152 | # should be done using priorities :( |
152 | # should be done using priorities :( |
153 | ($prev, $current) = ($current, shift @ready || $idle); |
153 | ($prev, $current) = ($current, shift @ready || $idle); |
154 | Coro::State::transfer($prev, $current); |
154 | Coro::State::transfer($prev, $current); |
155 | } |
155 | } |
156 | |
156 | |
157 | =item yield |
157 | =item cede |
158 | |
158 | |
159 | Yield to other processes. This function puts the current process into the |
159 | "Cede" to other processes. This function puts the current process into the |
160 | ready queue and calls C<schedule>. |
160 | ready queue and calls C<schedule>, which has the effect of giving up the |
|
|
161 | current "timeslice" to other coroutines of the same or higher priority. |
161 | |
162 | |
162 | =cut |
163 | =cut |
163 | |
164 | |
164 | sub yield { |
165 | sub cede { |
165 | $current->ready; |
166 | $current->ready; |
166 | &schedule; |
167 | &schedule; |
167 | } |
168 | } |
168 | |
169 | |
169 | =item terminate |
170 | =item terminate |
… | |
… | |
172 | |
173 | |
173 | Future versions of this function will allow result arguments. |
174 | Future versions of this function will allow result arguments. |
174 | |
175 | |
175 | =cut |
176 | =cut |
176 | |
177 | |
|
|
178 | # this coroutine is necessary because a coroutine |
|
|
179 | # cannot destroy itself. |
|
|
180 | my @destroy; |
|
|
181 | my $terminate = new Coro sub { |
|
|
182 | while() { |
|
|
183 | delete ((pop @destroy)->{_coro_state}) while @destroy; |
|
|
184 | &schedule; |
|
|
185 | } |
|
|
186 | }; |
|
|
187 | |
177 | sub terminate { |
188 | sub terminate { |
178 | $current->{_results} = [@_]; |
189 | push @destroy, $current; |
|
|
190 | $terminate->ready; |
179 | &schedule; |
191 | &schedule; |
|
|
192 | # NORETURN |
180 | } |
193 | } |
181 | |
194 | |
182 | =back |
195 | =back |
183 | |
196 | |
184 | # dynamic methods |
197 | # dynamic methods |