| … | |
… | |
| 366 | the watcher isn't pending it does nothing and returns 0. |
366 | the watcher isn't pending it does nothing and returns 0. |
| 367 | |
367 | |
| 368 | $previous_state = $w->keepalive ($bool) |
368 | $previous_state = $w->keepalive ($bool) |
| 369 | Normally, "EV::loop" will return when there are no active watchers |
369 | Normally, "EV::loop" will return when there are no active watchers |
| 370 | (which is a "deadlock" because no progress can be made anymore). |
370 | (which is a "deadlock" because no progress can be made anymore). |
| 371 | This is convinient because it allows you to start your watchers (and |
371 | This is convenient because it allows you to start your watchers (and |
| 372 | your jobs), call "EV::loop" once and when it returns you know that |
372 | your jobs), call "EV::loop" once and when it returns you know that |
| 373 | all your jobs are finished (or they forgot to register some watchers |
373 | all your jobs are finished (or they forgot to register some watchers |
| 374 | for their task :). |
374 | for their task :). |
| 375 | |
375 | |
| 376 | Sometimes, however, this gets in your way, for example when the |
376 | Sometimes, however, this gets in your way, for example when the |
| … | |
… | |
| 567 | Return the time that the watcher is expected to trigger next. |
567 | Return the time that the watcher is expected to trigger next. |
| 568 | |
568 | |
| 569 | SIGNAL WATCHERS - signal me when a signal gets signalled! |
569 | SIGNAL WATCHERS - signal me when a signal gets signalled! |
| 570 | $w = EV::signal $signal, $callback |
570 | $w = EV::signal $signal, $callback |
| 571 | $w = EV::signal_ns $signal, $callback |
571 | $w = EV::signal_ns $signal, $callback |
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572 | $w = $loop->signal ($signal, $callback) |
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|
573 | $w = $loop->signal_ns ($signal, $callback) |
| 572 | Call the callback when $signal is received (the signal can be |
574 | Call the callback when $signal is received (the signal can be |
| 573 | specified by number or by name, just as with "kill" or %SIG). |
575 | specified by number or by name, just as with "kill" or %SIG). |
|
|
576 | |
|
|
577 | Only one event loop can grab a given signal - attempting to grab the |
|
|
578 | same signal from two EV loops will crash the program immediately or |
|
|
579 | cause data corruption. |
| 574 | |
580 | |
| 575 | EV will grab the signal for the process (the kernel only allows one |
581 | EV will grab the signal for the process (the kernel only allows one |
| 576 | component to receive a signal at a time) when you start a signal |
582 | component to receive a signal at a time) when you start a signal |
| 577 | watcher, and removes it again when you stop it. Perl does the same |
583 | watcher, and removes it again when you stop it. Perl does the same |
| 578 | when you add/remove callbacks to %SIG, so watch out. |
584 | when you add/remove callbacks to %SIG, so watch out. |
