… | |
… | |
32 | |
32 | |
33 | =cut |
33 | =cut |
34 | |
34 | |
35 | package Coro; |
35 | package Coro; |
36 | |
36 | |
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37 | no warnings qw(uninitialized); |
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38 | |
37 | use Coro::State; |
39 | use Coro::State; |
38 | |
40 | |
39 | use base Exporter; |
41 | use base Exporter; |
40 | |
42 | |
41 | $VERSION = 0.12; |
43 | $VERSION = 0.51; |
42 | |
44 | |
43 | @EXPORT = qw(async cede schedule terminate current); |
45 | @EXPORT = qw(async cede schedule terminate current); |
44 | @EXPORT_OK = qw($current); |
46 | %EXPORT_TAGS = ( |
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47 | prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)], |
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48 | ); |
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49 | @EXPORT_OK = @{$EXPORT_TAGS{prio}}; |
45 | |
50 | |
46 | { |
51 | { |
47 | my @async; |
52 | my @async; |
48 | my $init; |
53 | my $init; |
49 | |
54 | |
… | |
… | |
111 | }; |
116 | }; |
112 | |
117 | |
113 | # this coroutine is necessary because a coroutine |
118 | # this coroutine is necessary because a coroutine |
114 | # cannot destroy itself. |
119 | # cannot destroy itself. |
115 | my @destroy; |
120 | my @destroy; |
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121 | my $manager; |
116 | my $manager = new Coro sub { |
122 | $manager = new Coro sub { |
117 | while() { |
123 | while() { |
118 | delete ((pop @destroy)->{_coro_state}) while @destroy; |
124 | # by overwriting the state object with the manager we destroy it |
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125 | # while still being able to schedule this coroutine (in case it has |
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126 | # been readied multiple times. this is harmless since the manager |
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127 | # can be called as many times as neccessary and will always |
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128 | # remove itself from the runqueue |
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129 | (pop @destroy)->{_coro_state} = $manager->{_coro_state} while @destroy; |
119 | &schedule; |
130 | &schedule; |
120 | } |
131 | } |
121 | }; |
132 | }; |
122 | |
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123 | # we really need priorities... |
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124 | my @ready; # the ready queue. hehe, rather broken ;) |
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125 | |
133 | |
126 | # static methods. not really. |
134 | # static methods. not really. |
127 | |
135 | |
128 | =head2 STATIC METHODS |
136 | =head2 STATIC METHODS |
129 | |
137 | |
… | |
… | |
160 | into the ready queue, so calling this function usually means you will |
168 | into the ready queue, so calling this function usually means you will |
161 | never be called again. |
169 | never be called again. |
162 | |
170 | |
163 | =cut |
171 | =cut |
164 | |
172 | |
165 | my $prev; |
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166 | |
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167 | sub schedule { |
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168 | # should be done using priorities :( |
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169 | ($prev, $current) = ($current, shift @ready || $idle); |
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170 | Coro::State::transfer($prev, $current); |
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171 | } |
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172 | |
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173 | =item cede |
173 | =item cede |
174 | |
174 | |
175 | "Cede" to other processes. This function puts the current process into the |
175 | "Cede" to other processes. This function puts the current process into the |
176 | ready queue and calls C<schedule>, which has the effect of giving up the |
176 | ready queue and calls C<schedule>, which has the effect of giving up the |
177 | current "timeslice" to other coroutines of the same or higher priority. |
177 | current "timeslice" to other coroutines of the same or higher priority. |
178 | |
178 | |
179 | =cut |
179 | =cut |
180 | |
180 | |
181 | sub cede { |
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 { |
182 | $current->ready; |
190 | $current->cancel; |
183 | &schedule; |
191 | &schedule; |
184 | } |
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185 | |
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186 | =item terminate |
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187 | |
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188 | Terminates the current process. |
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189 | |
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190 | Future versions of this function will allow result arguments. |
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191 | |
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192 | =cut |
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193 | |
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194 | sub terminate { |
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195 | push @destroy, $current; |
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196 | $manager->ready; |
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197 | &schedule; |
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198 | # NORETURN |
192 | die; # NORETURN |
199 | } |
193 | } |
200 | |
194 | |
201 | =back |
195 | =back |
202 | |
196 | |
203 | # dynamic methods |
197 | # dynamic methods |
… | |
… | |
234 | |
228 | |
235 | Put the current process into the ready queue. |
229 | Put the current process into the ready queue. |
236 | |
230 | |
237 | =cut |
231 | =cut |
238 | |
232 | |
239 | sub ready { |
233 | =item $process->cancel |
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234 | |
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235 | Like C<terminate>, but terminates the specified process instead. |
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236 | |
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237 | =cut |
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238 | |
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239 | sub cancel { |
240 | push @ready, $_[0]; |
240 | push @destroy, $_[0]; |
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241 | $manager->ready; |
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242 | &schedule if $current == $_[0]; |
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243 | } |
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244 | |
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245 | =item $oldprio = $process->prio($newprio) |
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246 | |
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247 | Sets the priority of the process. Higher priority processes get run before |
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248 | lower priority processes. Priorities are smalled signed integer (currently |
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249 | -4 .. +3), that you can refer to using PRIO_xxx constants (use the import |
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250 | tag :prio to get then): |
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251 | |
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252 | PRIO_MAX > PRIO_HIGH > PRIO_NORMAL > PRIO_LOW > PRIO_IDLE > PRIO_MIN |
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253 | 3 > 1 > 0 > -1 > -3 > -4 |
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254 | |
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255 | # set priority to HIGH |
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256 | current->prio(PRIO_HIGH); |
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257 | |
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258 | The idle coroutine ($Coro::idle) always has a lower priority than any |
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259 | existing coroutine. |
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260 | |
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261 | Changing the priority of the current process will take effect immediately, |
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262 | but changing the priority of processes in the ready queue (but not |
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263 | running) will only take effect after the next schedule (of that |
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264 | process). This is a bug that will be fixed in some future version. |
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265 | |
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266 | =cut |
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267 | |
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268 | sub prio { |
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269 | my $old = $_[0]{prio}; |
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270 | $_[0]{prio} = $_[1] if @_ > 1; |
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271 | $old; |
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272 | } |
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273 | |
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274 | =item $newprio = $process->nice($change) |
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275 | |
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276 | Similar to C<prio>, but subtract the given value from the priority (i.e. |
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277 | higher values mean lower priority, just as in unix). |
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278 | |
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279 | =cut |
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280 | |
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281 | sub nice { |
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282 | $_[0]{prio} -= $_[1]; |
241 | } |
283 | } |
242 | |
284 | |
243 | =back |
285 | =back |
244 | |
286 | |
245 | =cut |
287 | =cut |
246 | |
288 | |
247 | 1; |
289 | 1; |
248 | |
290 | |
249 | =head1 BUGS/LIMITATIONS |
291 | =head1 BUGS/LIMITATIONS |
250 | |
292 | |
251 | - could be faster, especially when the core would introduce special |
293 | - you must make very sure that no coro is still active on global destruction. |
252 | support for coroutines (like it does for threads). |
294 | very bad things might happen otherwise (usually segfaults). |
253 | - there is still a memleak on coroutine termination that I could not |
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254 | identify. Could be as small as a single SV. |
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255 | - this module is not well-tested. |
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256 | - if variables or arguments "disappear" (become undef) or become |
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257 | corrupted please contact the author so he cen iron out the |
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258 | remaining bugs. |
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259 | - this module is not thread-safe. You must only ever use this module from |
295 | - this module is not thread-safe. You must only ever use this module from |
260 | the same thread (this requirement might be loosened in the future to |
296 | the same thread (this requirement might be loosened in the future to |
261 | allow per-thread schedulers, but Coro::State does not yet allow this). |
297 | allow per-thread schedulers, but Coro::State does not yet allow this). |
262 | |
298 | |
263 | =head1 SEE ALSO |
299 | =head1 SEE ALSO |