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20 | |
20 | |
21 | =head1 DESCRIPTION |
21 | =head1 DESCRIPTION |
22 | |
22 | |
23 | This module collection manages coroutines. Coroutines are similar |
23 | This module collection manages coroutines. Coroutines are similar |
24 | to threads but don't run in parallel at the same time even on SMP |
24 | to threads but don't run in parallel at the same time even on SMP |
25 | machines. The specific flavor of coroutine use din this module also |
25 | machines. The specific flavor of coroutine used in this module also |
26 | guarentees you that it will not switch between coroutines unless |
26 | guarantees you that it will not switch between coroutines unless |
27 | necessary, at easily-identified points in your program, so locking and |
27 | necessary, at easily-identified points in your program, so locking and |
28 | parallel access are rarely an issue, making coroutine programming much |
28 | parallel access are rarely an issue, making coroutine programming much |
29 | safer than threads programming. |
29 | safer than threads programming. |
30 | |
30 | |
31 | (Perl, however, does not natively support real threads but instead does a |
31 | (Perl, however, does not natively support real threads but instead does a |
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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 = '3.61'; |
55 | our $VERSION = '3.7'; |
56 | |
56 | |
57 | our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub); |
57 | our @EXPORT = qw(async async_pool cede schedule terminate current unblock_sub); |
58 | our %EXPORT_TAGS = ( |
58 | our %EXPORT_TAGS = ( |
59 | prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)], |
59 | prio => [qw(PRIO_MAX PRIO_HIGH PRIO_NORMAL PRIO_LOW PRIO_IDLE PRIO_MIN)], |
60 | ); |
60 | ); |
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108 | |
108 | |
109 | The current coroutine (the last coroutine switched to). The initial value |
109 | The current coroutine (the last coroutine switched to). The initial value |
110 | is C<$main> (of course). |
110 | is C<$main> (of course). |
111 | |
111 | |
112 | This variable is B<strictly> I<read-only>. It is provided for performance |
112 | This variable is B<strictly> I<read-only>. It is provided for performance |
113 | reasons. If performance is not essentiel you are encouraged to use the |
113 | reasons. If performance is not essential you are encouraged to use the |
114 | C<Coro::current> function instead. |
114 | C<Coro::current> function instead. |
115 | |
115 | |
116 | =cut |
116 | =cut |
117 | |
117 | |
118 | # maybe some other module used Coro::Specific before... |
118 | # maybe some other module used Coro::Specific before... |
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249 | } |
249 | } |
250 | } |
250 | } |
251 | |
251 | |
252 | sub async_pool(&@) { |
252 | sub async_pool(&@) { |
253 | # this is also inlined into the unlock_scheduler |
253 | # this is also inlined into the unlock_scheduler |
|
|
254 | my $coro = (pop @pool) || do { |
254 | my $coro = (pop @pool or new Coro \&pool_handler); |
255 | my $coro = new Coro \&pool_handler; |
|
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256 | $coro->{desc} = "async_pool"; |
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257 | $coro |
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258 | }; |
255 | |
259 | |
256 | $coro->{_invoke} = [@_]; |
260 | $coro->{_invoke} = [@_]; |
257 | $coro->ready; |
261 | $coro->ready; |
258 | |
262 | |
259 | $coro |
263 | $coro |
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277 | # wake up sleeping coroutine |
281 | # wake up sleeping coroutine |
278 | $current->ready; |
282 | $current->ready; |
279 | undef $current; |
283 | undef $current; |
280 | }; |
284 | }; |
281 | |
285 | |
282 | # call schedule until event occured. |
286 | # call schedule until event occurred. |
283 | # in case we are woken up for other reasons |
287 | # in case we are woken up for other reasons |
284 | # (current still defined), loop. |
288 | # (current still defined), loop. |
285 | Coro::schedule while $current; |
289 | Coro::schedule while $current; |
286 | } |
290 | } |
287 | |
291 | |
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458 | =over 4 |
462 | =over 4 |
459 | |
463 | |
460 | =item Coro::nready |
464 | =item Coro::nready |
461 | |
465 | |
462 | Returns the number of coroutines that are currently in the ready state, |
466 | Returns the number of coroutines that are currently in the ready state, |
463 | i.e. that can be swicthed to. The value C<0> means that the only runnable |
467 | i.e. that can be switched to. The value C<0> means that the only runnable |
464 | coroutine is the currently running one, so C<cede> would have no effect, |
468 | coroutine is the currently running one, so C<cede> would have no effect, |
465 | and C<schedule> would cause a deadlock unless there is an idle handler |
469 | and C<schedule> would cause a deadlock unless there is an idle handler |
466 | that wakes up some coroutines. |
470 | that wakes up some coroutines. |
467 | |
471 | |
468 | =item my $guard = Coro::guard { ... } |
472 | =item my $guard = Coro::guard { ... } |
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504 | This utility function takes a BLOCK or code reference and "unblocks" it, |
508 | This utility function takes a BLOCK or code reference and "unblocks" it, |
505 | returning the new coderef. This means that the new coderef will return |
509 | returning the new coderef. This means that the new coderef will return |
506 | immediately without blocking, returning nothing, while the original code |
510 | immediately without blocking, returning nothing, while the original code |
507 | ref will be called (with parameters) from within its own coroutine. |
511 | ref will be called (with parameters) from within its own coroutine. |
508 | |
512 | |
509 | The reason this fucntion exists is that many event libraries (such as the |
513 | The reason this function exists is that many event libraries (such as the |
510 | venerable L<Event|Event> module) are not coroutine-safe (a weaker form |
514 | venerable L<Event|Event> module) are not coroutine-safe (a weaker form |
511 | of thread-safety). This means you must not block within event callbacks, |
515 | of thread-safety). This means you must not block within event callbacks, |
512 | otherwise you might suffer from crashes or worse. |
516 | otherwise you might suffer from crashes or worse. |
513 | |
517 | |
514 | This function allows your callbacks to block by executing them in another |
518 | This function allows your callbacks to block by executing them in another |
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560 | |
564 | |
561 | - you must make very sure that no coro is still active on global |
565 | - you must make very sure that no coro is still active on global |
562 | destruction. very bad things might happen otherwise (usually segfaults). |
566 | destruction. very bad things might happen otherwise (usually segfaults). |
563 | |
567 | |
564 | - this module is not thread-safe. You should only ever use this module |
568 | - this module is not thread-safe. You should only ever use this module |
565 | from the same thread (this requirement might be losened in the future |
569 | from the same thread (this requirement might be loosened in the future |
566 | to allow per-thread schedulers, but Coro::State does not yet allow |
570 | to allow per-thread schedulers, but Coro::State does not yet allow |
567 | this). |
571 | this). |
568 | |
572 | |
569 | =head1 SEE ALSO |
573 | =head1 SEE ALSO |
570 | |
574 | |