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50 | |
50 | |
51 | our $idle; # idle handler |
51 | our $idle; # idle handler |
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 $VERSION = '3.61'; |
56 | |
56 | |
57 | our @EXPORT = qw(async cede schedule terminate current unblock_sub); |
57 | our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub); |
58 | our %EXPORT_TAGS = ( |
58 | our %EXPORT_TAGS = ( |
59 | prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)], |
59 | prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)], |
60 | ); |
60 | ); |
61 | our @EXPORT_OK = (@{$EXPORT_TAGS{prio}}, qw(nready)); |
61 | our @EXPORT_OK = (@{$EXPORT_TAGS{prio}}, qw(nready)); |
62 | |
62 | |
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185 | |
185 | |
186 | Create a new asynchronous coroutine and return it's coroutine object |
186 | Create a new asynchronous coroutine and return it's coroutine object |
187 | (usually unused). When the sub returns the new coroutine is automatically |
187 | (usually unused). When the sub returns the new coroutine is automatically |
188 | terminated. |
188 | terminated. |
189 | |
189 | |
190 | Calling C<exit> in a coroutine will not work correctly, so do not do that. |
190 | Calling C<exit> in a coroutine will do the same as calling exit outside |
191 | |
191 | the coroutine. Likewise, when the coroutine dies, the program will exit, |
192 | When the coroutine dies, the program will exit, just as in the main |
192 | just as it would in the main program. |
193 | program. |
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194 | |
193 | |
195 | # create a new coroutine that just prints its arguments |
194 | # create a new coroutine that just prints its arguments |
196 | async { |
195 | async { |
197 | print "@_\n"; |
196 | print "@_\n"; |
198 | } 1,2,3,4; |
197 | } 1,2,3,4; |
199 | |
198 | |
200 | =cut |
199 | =cut |
201 | |
200 | |
202 | sub async(&@) { |
201 | sub async(&@) { |
203 | my $pid = new Coro @_; |
202 | my $coro = new Coro @_; |
204 | $pid->ready; |
203 | $coro->ready; |
205 | $pid |
204 | $coro |
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205 | } |
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206 | |
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207 | =item async_pool { ... } [@args...] |
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208 | |
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209 | Similar to C<async>, but uses a coroutine pool, so you should not call |
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210 | terminate or join (although you are allowed to), and you get a coroutine |
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211 | that might have executed other code already (which can be good or bad :). |
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212 | |
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213 | Also, the block is executed in an C<eval> context and a warning will be |
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214 | issued in case of an exception instead of terminating the program, as |
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215 | C<async> does. As the coroutine is being reused, stuff like C<on_destroy> |
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216 | will not work in the expected way, unless you call terminate or cancel, |
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217 | which somehow defeats the purpose of pooling. |
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218 | |
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219 | The priority will be reset to C<0> after each job, otherwise the coroutine |
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220 | will be re-used "as-is". |
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221 | |
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222 | The pool size is limited to 8 idle coroutines (this can be adjusted by |
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223 | changing $Coro::POOL_SIZE), and there can be as many non-idle coros as |
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224 | required. |
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225 | |
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226 | If you are concerned about pooled coroutines growing a lot because a |
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227 | single C<async_pool> used a lot of stackspace you can e.g. C<async_pool { |
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228 | terminate }> once per second or so to slowly replenish the pool. |
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229 | |
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230 | =cut |
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231 | |
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232 | our $POOL_SIZE = 8; |
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233 | our @pool; |
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234 | |
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235 | sub pool_handler { |
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236 | while () { |
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237 | eval { |
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238 | my ($cb, @arg) = @{ delete $current->{_invoke} or return }; |
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239 | $cb->(@arg); |
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240 | }; |
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241 | warn $@ if $@; |
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242 | |
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243 | last if @pool >= $POOL_SIZE; |
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244 | push @pool, $current; |
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245 | |
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246 | $current->save (Coro::State::SAVE_DEF); |
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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 |
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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 | |
240 | =item Coro::cede_notself |
296 | =item Coro::cede_notself |
241 | |
297 | |
242 | Works like cede, but is not exported by default and will cede to any |
298 | Works like cede, but is not exported by default and will cede to any |
243 | coroutine, regardless of priority, once. |
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. |
244 | |
302 | |
245 | =item terminate [arg...] |
303 | =item terminate [arg...] |
246 | |
304 | |
247 | 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>). |
248 | |
306 | |
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267 | Create a new coroutine and return it. When the sub returns the coroutine |
325 | Create a new coroutine and return it. When the sub returns the coroutine |
268 | automatically terminates as if C<terminate> with the returned values were |
326 | automatically terminates as if C<terminate> with the returned values were |
269 | called. To make the coroutine run you must first put it into the ready queue |
327 | called. To make the coroutine run you must first put it into the ready queue |
270 | by calling the ready method. |
328 | by calling the ready method. |
271 | |
329 | |
272 | Calling C<exit> in a coroutine will not work correctly, so do not do that. |
330 | See C<async> for additional discussion. |
273 | |
331 | |
274 | =cut |
332 | =cut |
275 | |
333 | |
276 | sub _run_coro { |
334 | sub _run_coro { |
277 | terminate &{+shift}; |
335 | terminate &{+shift}; |
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407 | 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 |
408 | that wakes up some coroutines. |
466 | that wakes up some coroutines. |
409 | |
467 | |
410 | =item my $guard = Coro::guard { ... } |
468 | =item my $guard = Coro::guard { ... } |
411 | |
469 | |
412 | This creates and returns a guard object. Nothing happens until the objetc |
470 | This creates and returns a guard object. Nothing happens until the object |
413 | gets destroyed, in which case the codeblock given as argument will be |
471 | gets destroyed, in which case the codeblock given as argument will be |
414 | executed. This is useful to free locks or other resources in case of a |
472 | executed. This is useful to free locks or other resources in case of a |
415 | runtime error or when the coroutine gets canceled, as in both cases the |
473 | runtime error or when the coroutine gets canceled, as in both cases the |
416 | guard block will be executed. The guard object supports only one method, |
474 | guard block will be executed. The guard object supports only one method, |
417 | C<< ->cancel >>, which will keep the codeblock from being executed. |
475 | C<< ->cancel >>, which will keep the codeblock from being executed. |
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461 | 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 |
462 | creating event callbacks that want to block. |
520 | creating event callbacks that want to block. |
463 | |
521 | |
464 | =cut |
522 | =cut |
465 | |
523 | |
466 | our @unblock_pool; |
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467 | our @unblock_queue; |
524 | our @unblock_queue; |
468 | our $UNBLOCK_POOL_SIZE = 2; |
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469 | |
525 | |
470 | sub unblock_handler_ { |
526 | # we create a special coro because we want to cede, |
471 | while () { |
527 | # to reduce pressure on the coro pool (because most callbacks |
472 | my ($cb, @arg) = @{ delete $Coro::current->{arg} }; |
528 | # return immediately and can be reused) and because we cannot cede |
473 | $cb->(@arg); |
529 | # inside an event callback. |
474 | |
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475 | last if @unblock_pool >= $UNBLOCK_POOL_SIZE; |
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476 | push @unblock_pool, $Coro::current; |
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477 | schedule; |
|
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478 | } |
|
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479 | } |
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480 | |
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481 | our $unblock_scheduler = async { |
530 | our $unblock_scheduler = async { |
482 | while () { |
531 | while () { |
483 | while (my $cb = pop @unblock_queue) { |
532 | while (my $cb = pop @unblock_queue) { |
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533 | # this is an inlined copy of async_pool |
484 | my $handler = (pop @unblock_pool or new Coro \&unblock_handler_); |
534 | my $coro = (pop @pool or new Coro \&pool_handler); |
485 | $handler->{arg} = $cb; |
535 | |
|
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536 | $coro->{_invoke} = $cb; |
486 | $handler->ready; |
537 | $coro->ready; |
487 | cede; |
538 | cede; # for short-lived callbacks, this reduces pressure on the coro pool |
488 | } |
539 | } |
489 | |
540 | schedule; # sleep well |
490 | schedule; |
|
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491 | } |
541 | } |
492 | }; |
542 | }; |
493 | |
543 | |
494 | sub unblock_sub(&) { |
544 | sub unblock_sub(&) { |
495 | my $cb = shift; |
545 | my $cb = shift; |
496 | |
546 | |
497 | sub { |
547 | sub { |
498 | push @unblock_queue, [$cb, @_]; |
548 | unshift @unblock_queue, [$cb, @_]; |
499 | $unblock_scheduler->ready; |
549 | $unblock_scheduler->ready; |
500 | } |
550 | } |
501 | } |
551 | } |
502 | |
552 | |
503 | =back |
553 | =back |