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52 | our $main; # main coroutine |
52 | our $main; # main coroutine |
53 | our $current; # current coroutine |
53 | our $current; # current coroutine |
54 | |
54 | |
55 | our $VERSION = '3.3'; |
55 | our $VERSION = '3.3'; |
56 | |
56 | |
57 | our @EXPORT = qw(async cede schedule terminate current unblock_sub); |
57 | our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub); |
58 | our %EXPORT_TAGS = ( |
58 | our %EXPORT_TAGS = ( |
59 | prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)], |
59 | prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)], |
60 | ); |
60 | ); |
61 | our @EXPORT_OK = (@{$EXPORT_TAGS{prio}}, qw(nready)); |
61 | our @EXPORT_OK = (@{$EXPORT_TAGS{prio}}, qw(nready)); |
62 | |
62 | |
… | |
… | |
141 | $idle = sub { |
141 | $idle = sub { |
142 | require Carp; |
142 | require Carp; |
143 | Carp::croak ("FATAL: deadlock detected"); |
143 | Carp::croak ("FATAL: deadlock detected"); |
144 | }; |
144 | }; |
145 | |
145 | |
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146 | sub _cancel { |
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147 | my ($self) = @_; |
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148 | |
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149 | # free coroutine data and mark as destructed |
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150 | $self->_destroy |
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151 | or return; |
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152 | |
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153 | # call all destruction callbacks |
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154 | $_->(@{$self->{status}}) |
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155 | for @{(delete $self->{destroy_cb}) || []}; |
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156 | } |
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157 | |
146 | # this coroutine is necessary because a coroutine |
158 | # this coroutine is necessary because a coroutine |
147 | # cannot destroy itself. |
159 | # cannot destroy itself. |
148 | my @destroy; |
160 | my @destroy; |
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161 | my $manager; |
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162 | |
149 | my $manager; $manager = new Coro sub { |
163 | $manager = new Coro sub { |
150 | while () { |
164 | while () { |
151 | # by overwriting the state object with the manager we destroy it |
165 | (shift @destroy)->_cancel |
152 | # while still being able to schedule this coroutine (in case it has |
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153 | # been readied multiple times. this is harmless since the manager |
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154 | # can be called as many times as neccessary and will always |
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155 | # remove itself from the runqueue |
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156 | while (@destroy) { |
166 | while @destroy; |
157 | my $coro = pop @destroy; |
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158 | |
167 | |
159 | $coro->{status} ||= []; |
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160 | |
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161 | $_->ready for @{(delete $coro->{join} ) || []}; |
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162 | $_->(@{$coro->{status}}) for @{(delete $coro->{destroy_cb}) || []}; |
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163 | |
|
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164 | # the next line destroys the coro state, but keeps the |
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165 | # coroutine itself intact (we basically make it a zombie |
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166 | # coroutine that always runs the manager thread, so it's possible |
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167 | # to transfer() to this coroutine). |
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168 | $coro->_clone_state_from ($manager); |
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169 | } |
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170 | &schedule; |
168 | &schedule; |
171 | } |
169 | } |
172 | }; |
170 | }; |
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171 | |
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172 | $manager->prio (PRIO_MAX); |
173 | |
173 | |
174 | # static methods. not really. |
174 | # static methods. not really. |
175 | |
175 | |
176 | =back |
176 | =back |
177 | |
177 | |
… | |
… | |
198 | } 1,2,3,4; |
198 | } 1,2,3,4; |
199 | |
199 | |
200 | =cut |
200 | =cut |
201 | |
201 | |
202 | sub async(&@) { |
202 | sub async(&@) { |
203 | my $pid = new Coro @_; |
203 | my $coro = new Coro @_; |
204 | $pid->ready; |
204 | $coro->ready; |
205 | $pid |
205 | $coro |
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206 | } |
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207 | |
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208 | =item async_pool { ... } [@args...] |
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209 | |
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210 | Similar to C<async>, but uses a coroutine pool, so you should not call |
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211 | terminate or join (although you are allowed to), and you get a coroutine |
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212 | that might have executed other code already (which can be good or bad :). |
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213 | |
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214 | Also, the block is executed in an C<eval> context and a warning will be |
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215 | issued in case of an exception instead of terminating the program, as |
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216 | C<async> does. As the coroutine is being reused, stuff like C<on_destroy> |
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217 | will not work in the expected way, unless you call terminate or cancel, |
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218 | which somehow defeats the purpose of pooling. |
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219 | |
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220 | The priority will be reset to C<0> after each job, otherwise the coroutine |
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221 | will be re-used "as-is". |
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222 | |
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223 | The pool size is limited to 8 idle coroutines (this can be adjusted by |
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224 | changing $Coro::POOL_SIZE), and there can be as many non-idle coros as |
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225 | required. |
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226 | |
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227 | If you are concerned about pooled coroutines growing a lot because a |
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228 | single C<async_pool> used a lot of stackspace you can e.g. C<async_pool { |
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229 | terminate }> once per second or so to slowly replenish the pool. |
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230 | |
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231 | =cut |
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232 | |
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233 | our $POOL_SIZE = 8; |
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234 | our @pool; |
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235 | |
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236 | sub pool_handler { |
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237 | while () { |
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238 | eval { |
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239 | my ($cb, @arg) = @{ delete $current->{_invoke} }; |
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240 | $cb->(@arg); |
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241 | }; |
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242 | warn $@ if $@; |
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243 | |
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244 | last if @pool >= $POOL_SIZE; |
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245 | push @pool, $current; |
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246 | |
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247 | $current->prio (0); |
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248 | schedule; |
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249 | } |
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250 | } |
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251 | |
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252 | sub async_pool(&@) { |
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253 | # this is also inlined into the unlock_scheduler |
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254 | my $coro = (pop @pool or new Coro \&pool_handler); |
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255 | |
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256 | $coro->{_invoke} = [@_]; |
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257 | $coro->ready; |
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258 | |
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259 | $coro |
206 | } |
260 | } |
207 | |
261 | |
208 | =item schedule |
262 | =item schedule |
209 | |
263 | |
210 | Calls the scheduler. Please note that the current coroutine will not be put |
264 | Calls the scheduler. Please note that the current coroutine will not be put |
… | |
… | |
235 | |
289 | |
236 | "Cede" to other coroutines. This function puts the current coroutine into the |
290 | "Cede" to other coroutines. This function puts the current coroutine into the |
237 | ready queue and calls C<schedule>, which has the effect of giving up the |
291 | ready queue and calls C<schedule>, which has the effect of giving up the |
238 | current "timeslice" to other coroutines of the same or higher priority. |
292 | current "timeslice" to other coroutines of the same or higher priority. |
239 | |
293 | |
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294 | Returns true if at least one coroutine switch has happened. |
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295 | |
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296 | =item Coro::cede_notself |
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297 | |
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298 | Works like cede, but is not exported by default and will cede to any |
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299 | coroutine, regardless of priority, once. |
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300 | |
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301 | Returns true if at least one coroutine switch has happened. |
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302 | |
240 | =item terminate [arg...] |
303 | =item terminate [arg...] |
241 | |
304 | |
242 | Terminates the current coroutine with the given status values (see L<cancel>). |
305 | Terminates the current coroutine with the given status values (see L<cancel>). |
243 | |
306 | |
244 | =cut |
307 | =cut |
… | |
… | |
289 | Return wether the coroutine is currently the ready queue or not, |
352 | Return wether the coroutine is currently the ready queue or not, |
290 | |
353 | |
291 | =item $coroutine->cancel (arg...) |
354 | =item $coroutine->cancel (arg...) |
292 | |
355 | |
293 | Terminates the given coroutine and makes it return the given arguments as |
356 | Terminates the given coroutine and makes it return the given arguments as |
294 | status (default: the empty list). |
357 | status (default: the empty list). Never returns if the coroutine is the |
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358 | current coroutine. |
295 | |
359 | |
296 | =cut |
360 | =cut |
297 | |
361 | |
298 | sub cancel { |
362 | sub cancel { |
299 | my $self = shift; |
363 | my $self = shift; |
300 | $self->{status} = [@_]; |
364 | $self->{status} = [@_]; |
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365 | |
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366 | if ($current == $self) { |
301 | push @destroy, $self; |
367 | push @destroy, $self; |
302 | $manager->ready; |
368 | $manager->ready; |
303 | &schedule if $current == $self; |
369 | &schedule while 1; |
|
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370 | } else { |
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371 | $self->_cancel; |
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372 | } |
304 | } |
373 | } |
305 | |
374 | |
306 | =item $coroutine->join |
375 | =item $coroutine->join |
307 | |
376 | |
308 | Wait until the coroutine terminates and return any values given to the |
377 | Wait until the coroutine terminates and return any values given to the |
… | |
… | |
311 | |
380 | |
312 | =cut |
381 | =cut |
313 | |
382 | |
314 | sub join { |
383 | sub join { |
315 | my $self = shift; |
384 | my $self = shift; |
|
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385 | |
316 | unless ($self->{status}) { |
386 | unless ($self->{status}) { |
317 | push @{$self->{join}}, $current; |
387 | my $current = $current; |
318 | &schedule; |
388 | |
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389 | push @{$self->{destroy_cb}}, sub { |
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390 | $current->ready; |
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391 | undef $current; |
|
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392 | }; |
|
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393 | |
|
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394 | &schedule while $current; |
319 | } |
395 | } |
|
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396 | |
320 | wantarray ? @{$self->{status}} : $self->{status}[0]; |
397 | wantarray ? @{$self->{status}} : $self->{status}[0]; |
321 | } |
398 | } |
322 | |
399 | |
323 | =item $coroutine->on_destroy (\&cb) |
400 | =item $coroutine->on_destroy (\&cb) |
324 | |
401 | |
… | |
… | |
386 | i.e. that can be swicthed to. The value C<0> means that the only runnable |
463 | i.e. that can be swicthed to. The value C<0> means that the only runnable |
387 | coroutine is the currently running one, so C<cede> would have no effect, |
464 | coroutine is the currently running one, so C<cede> would have no effect, |
388 | and C<schedule> would cause a deadlock unless there is an idle handler |
465 | and C<schedule> would cause a deadlock unless there is an idle handler |
389 | that wakes up some coroutines. |
466 | that wakes up some coroutines. |
390 | |
467 | |
|
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468 | =item my $guard = Coro::guard { ... } |
|
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469 | |
|
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470 | This creates and returns a guard object. Nothing happens until the objetc |
|
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471 | gets destroyed, in which case the codeblock given as argument will be |
|
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472 | executed. This is useful to free locks or other resources in case of a |
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473 | runtime error or when the coroutine gets canceled, as in both cases the |
|
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474 | guard block will be executed. The guard object supports only one method, |
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475 | C<< ->cancel >>, which will keep the codeblock from being executed. |
|
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476 | |
|
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477 | Example: set some flag and clear it again when the coroutine gets canceled |
|
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478 | or the function returns: |
|
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479 | |
|
|
480 | sub do_something { |
|
|
481 | my $guard = Coro::guard { $busy = 0 }; |
|
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482 | $busy = 1; |
|
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483 | |
|
|
484 | # do something that requires $busy to be true |
|
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485 | } |
|
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486 | |
|
|
487 | =cut |
|
|
488 | |
|
|
489 | sub guard(&) { |
|
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490 | bless \(my $cb = $_[0]), "Coro::guard" |
|
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491 | } |
|
|
492 | |
|
|
493 | sub Coro::guard::cancel { |
|
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494 | ${$_[0]} = sub { }; |
|
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495 | } |
|
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496 | |
|
|
497 | sub Coro::guard::DESTROY { |
|
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498 | ${$_[0]}->(); |
|
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499 | } |
|
|
500 | |
|
|
501 | |
391 | =item unblock_sub { ... } |
502 | =item unblock_sub { ... } |
392 | |
503 | |
393 | This utility function takes a BLOCK or code reference and "unblocks" it, |
504 | This utility function takes a BLOCK or code reference and "unblocks" it, |
394 | returning the new coderef. This means that the new coderef will return |
505 | returning the new coderef. This means that the new coderef will return |
395 | immediately without blocking, returning nothing, while the original code |
506 | immediately without blocking, returning nothing, while the original code |
… | |
… | |
408 | In short: simply use C<unblock_sub { ... }> instead of C<sub { ... }> when |
519 | In short: simply use C<unblock_sub { ... }> instead of C<sub { ... }> when |
409 | creating event callbacks that want to block. |
520 | creating event callbacks that want to block. |
410 | |
521 | |
411 | =cut |
522 | =cut |
412 | |
523 | |
413 | our @unblock_pool; |
|
|
414 | our @unblock_queue; |
524 | our @unblock_queue; |
415 | our $UNBLOCK_POOL_SIZE = 2; |
|
|
416 | |
525 | |
417 | sub unblock_handler_ { |
526 | # we create a special coro because we want to cede, |
418 | while () { |
527 | # to reduce pressure on the coro pool (because most callbacks |
419 | my ($cb, @arg) = @{ delete $Coro::current->{arg} }; |
528 | # return immediately and can be reused) and because we cannot cede |
420 | $cb->(@arg); |
529 | # inside an event callback. |
421 | |
|
|
422 | last if @unblock_pool >= $UNBLOCK_POOL_SIZE; |
|
|
423 | push @unblock_pool, $Coro::current; |
|
|
424 | schedule; |
|
|
425 | } |
|
|
426 | } |
|
|
427 | |
|
|
428 | our $unblock_scheduler = async { |
530 | our $unblock_scheduler = async { |
429 | while () { |
531 | while () { |
430 | while (my $cb = pop @unblock_queue) { |
532 | while (my $cb = pop @unblock_queue) { |
|
|
533 | # this is an inlined copy of async_pool |
431 | my $handler = (pop @unblock_pool or new Coro \&unblock_handler_); |
534 | my $coro = (pop @pool or new Coro \&pool_handler); |
432 | $handler->{arg} = $cb; |
535 | |
|
|
536 | $coro->{_invoke} = $cb; |
433 | $handler->ready; |
537 | $coro->ready; |
434 | cede; |
538 | cede; # for short-lived callbacks, this reduces pressure on the coro pool |
435 | } |
539 | } |
436 | |
540 | schedule; # sleep well |
437 | schedule; |
|
|
438 | } |
541 | } |
439 | }; |
542 | }; |
440 | |
543 | |
441 | sub unblock_sub(&) { |
544 | sub unblock_sub(&) { |
442 | my $cb = shift; |
545 | my $cb = shift; |
443 | |
546 | |
444 | sub { |
547 | sub { |
445 | push @unblock_queue, [$cb, @_]; |
548 | unshift @unblock_queue, [$cb, @_]; |
446 | $unblock_scheduler->ready; |
549 | $unblock_scheduler->ready; |
447 | } |
550 | } |
448 | } |
551 | } |
449 | |
552 | |
450 | =back |
553 | =back |