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36 | |
36 | |
37 | use Coro::State; |
37 | use Coro::State; |
38 | |
38 | |
39 | use base Exporter; |
39 | use base Exporter; |
40 | |
40 | |
41 | $VERSION = 0.12; |
41 | $VERSION = 0.5; |
42 | |
42 | |
43 | @EXPORT = qw(async cede schedule terminate current); |
43 | @EXPORT = qw(async cede schedule terminate current); |
44 | @EXPORT_OK = qw($current); |
44 | %EXPORT_TAGS = ( |
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45 | prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)], |
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46 | ); |
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47 | @EXPORT_OK = @{$EXPORT_TAGS{prio}}; |
45 | |
48 | |
46 | { |
49 | { |
47 | my @async; |
50 | my @async; |
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51 | my $init; |
48 | |
52 | |
49 | # this way of handling attributes simply is NOT scalable ;() |
53 | # this way of handling attributes simply is NOT scalable ;() |
50 | sub import { |
54 | sub import { |
51 | Coro->export_to_level(1, @_); |
55 | Coro->export_to_level(1, @_); |
52 | my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE}; |
56 | my $old = *{(caller)[0]."::MODIFY_CODE_ATTRIBUTES"}{CODE}; |
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54 | my ($package, $ref) = (shift, shift); |
58 | my ($package, $ref) = (shift, shift); |
55 | my @attrs; |
59 | my @attrs; |
56 | for (@_) { |
60 | for (@_) { |
57 | if ($_ eq "Coro") { |
61 | if ($_ eq "Coro") { |
58 | push @async, $ref; |
62 | push @async, $ref; |
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63 | unless ($init++) { |
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64 | eval q{ |
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65 | sub INIT { |
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66 | &async(pop @async) while @async; |
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67 | } |
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68 | }; |
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69 | } |
59 | } else { |
70 | } else { |
60 | push @attrs, $_; |
71 | push @attrs, $_; |
61 | } |
72 | } |
62 | } |
73 | } |
63 | return $old ? $old->($package, $ref, @attrs) : @attrs; |
74 | return $old ? $old->($package, $ref, @attrs) : @attrs; |
64 | }; |
75 | }; |
65 | } |
76 | } |
66 | |
77 | |
67 | sub INIT { |
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68 | &async(pop @async) while @async; |
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69 | } |
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70 | } |
78 | } |
71 | |
79 | |
72 | =item $main |
80 | =item $main |
73 | |
81 | |
74 | This coroutine represents the main program. |
82 | This coroutine represents the main program. |
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113 | delete ((pop @destroy)->{_coro_state}) while @destroy; |
121 | delete ((pop @destroy)->{_coro_state}) while @destroy; |
114 | &schedule; |
122 | &schedule; |
115 | } |
123 | } |
116 | }; |
124 | }; |
117 | |
125 | |
118 | # we really need priorities... |
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119 | my @ready; # the ready queue. hehe, rather broken ;) |
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120 | |
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121 | # static methods. not really. |
126 | # static methods. not really. |
122 | |
127 | |
123 | =head2 STATIC METHODS |
128 | =head2 STATIC METHODS |
124 | |
129 | |
125 | Static methods are actually functions that operate on the current process only. |
130 | Static methods are actually functions that operate on the current process only. |
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155 | into the ready queue, so calling this function usually means you will |
160 | into the ready queue, so calling this function usually means you will |
156 | never be called again. |
161 | never be called again. |
157 | |
162 | |
158 | =cut |
163 | =cut |
159 | |
164 | |
160 | my $prev; |
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161 | |
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162 | sub schedule { |
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163 | # should be done using priorities :( |
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164 | ($prev, $current) = ($current, shift @ready || $idle); |
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165 | Coro::State::transfer($prev, $current); |
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166 | } |
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167 | |
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168 | =item cede |
165 | =item cede |
169 | |
166 | |
170 | "Cede" to other processes. This function puts the current process into the |
167 | "Cede" to other processes. This function puts the current process into the |
171 | ready queue and calls C<schedule>, which has the effect of giving up the |
168 | ready queue and calls C<schedule>, which has the effect of giving up the |
172 | current "timeslice" to other coroutines of the same or higher priority. |
169 | current "timeslice" to other coroutines of the same or higher priority. |
173 | |
170 | |
174 | =cut |
171 | =cut |
175 | |
172 | |
176 | sub cede { |
173 | =item terminate |
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174 | |
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175 | Terminates the current process. |
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176 | |
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177 | Future versions of this function will allow result arguments. |
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178 | |
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179 | =cut |
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180 | |
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181 | sub terminate { |
177 | $current->ready; |
182 | $current->cancel; |
178 | &schedule; |
183 | &schedule; |
179 | } |
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180 | |
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181 | =item terminate |
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182 | |
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183 | Terminates the current process. |
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184 | |
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185 | Future versions of this function will allow result arguments. |
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186 | |
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187 | =cut |
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188 | |
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189 | sub terminate { |
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190 | push @destroy, $current; |
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191 | $manager->ready; |
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192 | &schedule; |
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193 | # NORETURN |
184 | die; # NORETURN |
194 | } |
185 | } |
195 | |
186 | |
196 | =back |
187 | =back |
197 | |
188 | |
198 | # dynamic methods |
189 | # dynamic methods |
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229 | |
220 | |
230 | Put the current process into the ready queue. |
221 | Put the current process into the ready queue. |
231 | |
222 | |
232 | =cut |
223 | =cut |
233 | |
224 | |
234 | sub ready { |
225 | =item $process->cancel |
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226 | |
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227 | Like C<terminate>, but terminates the specified process instead. |
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228 | |
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229 | =cut |
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230 | |
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231 | sub cancel { |
235 | push @ready, $_[0]; |
232 | push @destroy, $_[0]; |
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233 | $manager->ready; |
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234 | } |
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235 | |
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236 | =item $oldprio = $process->prio($newprio) |
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237 | |
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238 | Sets the priority of the process. Higher priority processes get run before |
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239 | lower priority processes. Priorities are smalled signed integer (currently |
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240 | -4 .. +3), that you can refer to using PRIO_xxx constants (use the import |
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241 | tag :prio to get then): |
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242 | |
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243 | PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN |
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244 | 3 > 1 > 0 > -1 > -3 > -4 |
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245 | |
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246 | # set priority to HIGH |
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247 | current->prio(PRIO_HIGH); |
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248 | |
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249 | The idle coroutine ($Coro::idle) always has a lower priority than any |
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250 | existing coroutine. |
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251 | |
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252 | Changing the priority of the current process will take effect immediately, |
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253 | but changing the priority of processes in the ready queue (but not |
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254 | running) will only take effect after the next schedule (of that |
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255 | process). This is a bug that will be fixed in some future version. |
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256 | |
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257 | =cut |
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258 | |
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259 | sub prio { |
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260 | my $old = $_[0]{prio}; |
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261 | $_[0]{prio} = $_[1] if @_ > 1; |
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262 | $old; |
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263 | } |
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264 | |
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265 | =item $newprio = $process->nice($change) |
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266 | |
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267 | Similar to C<prio>, but subtract the given value from the priority (i.e. |
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268 | higher values mean lower priority, just as in unix). |
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269 | |
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270 | =cut |
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271 | |
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272 | sub nice { |
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273 | $_[0]{prio} -= $_[1]; |
236 | } |
274 | } |
237 | |
275 | |
238 | =back |
276 | =back |
239 | |
277 | |
240 | =cut |
278 | =cut |
241 | |
279 | |
242 | 1; |
280 | 1; |
243 | |
281 | |
244 | =head1 BUGS/LIMITATIONS |
282 | =head1 BUGS/LIMITATIONS |
245 | |
283 | |
246 | - could be faster, especially when the core would introduce special |
284 | - you must make very sure that no coro is still active on global destruction. |
247 | support for coroutines (like it does for threads). |
285 | very bad things might happen otherwise (usually segfaults). |
248 | - there is still a memleak on coroutine termination that I could not |
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249 | identify. Could be as small as a single SV. |
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250 | - this module is not well-tested. |
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251 | - if variables or arguments "disappear" (become undef) or become |
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252 | corrupted please contact the author so he cen iron out the |
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253 | remaining bugs. |
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254 | - this module is not thread-safe. You must only ever use this module from |
286 | - 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 |
287 | 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). |
288 | allow per-thread schedulers, but Coro::State does not yet allow this). |
257 | |
289 | |
258 | =head1 SEE ALSO |
290 | =head1 SEE ALSO |
259 | |
291 | |
260 | L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>, |
292 | L<Coro::Channel>, L<Coro::Cont>, L<Coro::Specific>, L<Coro::Semaphore>, |
261 | L<Coro::Signal>, L<Coro::State>, L<Coro::Event>, L<Coro::RWLock>, |
293 | L<Coro::Signal>, L<Coro::State>, L<Coro::Event>, L<Coro::RWLock>, |
262 | L<Coro::L<Coro::Handle>, L<Coro::Socket>. |
294 | L<Coro::Handle>, L<Coro::Socket>. |
263 | |
295 | |
264 | =head1 AUTHOR |
296 | =head1 AUTHOR |
265 | |
297 | |
266 | Marc Lehmann <pcg@goof.com> |
298 | Marc Lehmann <pcg@goof.com> |
267 | http://www.goof.com/pcg/marc/ |
299 | http://www.goof.com/pcg/marc/ |