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… | |
| 160 | =back |
160 | =back |
| 161 | |
161 | |
| 162 | =head2 SIGNAL WATCHERS |
162 | =head2 SIGNAL WATCHERS |
| 163 | |
163 | |
| 164 | You can listen for signals using a signal watcher, C<signal> is the signal |
164 | You can listen for signals using a signal watcher, C<signal> is the signal |
| 165 | I<name> without any C<SIG> prefix. |
165 | I<name> without any C<SIG> prefix. Multiple signals events can be clumped |
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166 | together into one callback invocation, and callbakc invocation might or |
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167 | might not be asynchronous. |
| 166 | |
168 | |
| 167 | These watchers might use C<%SIG>, so programs overwriting those signals |
169 | These watchers might use C<%SIG>, so programs overwriting those signals |
| 168 | directly will likely not work correctly. |
170 | directly will likely not work correctly. |
| 169 | |
171 | |
| 170 | Example: exit on SIGINT |
172 | Example: exit on SIGINT |
| 171 | |
173 | |
| 172 | my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 }); |
174 | my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 }); |
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175 | |
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176 | =head2 CHILD PROCESS WATCHERS |
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177 | |
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178 | You can also listen for the status of a child process specified by the |
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179 | C<pid> argument. The watcher will only trigger once. This works by |
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180 | installing a signal handler for C<SIGCHLD>. |
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181 | |
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182 | Example: wait for pid 1333 |
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183 | |
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184 | my $w = AnyEvent->child (pid => 1333, cb => sub { warn "exit status $?" }); |
| 173 | |
185 | |
| 174 | =head1 GLOBALS |
186 | =head1 GLOBALS |
| 175 | |
187 | |
| 176 | =over 4 |
188 | =over 4 |
| 177 | |
189 | |
| … | |
… | |
| 308 | $class->$func (@_); |
320 | $class->$func (@_); |
| 309 | } |
321 | } |
| 310 | |
322 | |
| 311 | package AnyEvent::Base; |
323 | package AnyEvent::Base; |
| 312 | |
324 | |
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325 | # default implementation for ->condvar, ->wait, ->broadcast |
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326 | |
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327 | sub condvar { |
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328 | bless \my $flag, "AnyEvent::Base::CondVar" |
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329 | } |
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330 | |
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331 | sub AnyEvent::Base::CondVar::broadcast { |
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332 | ${$_[0]}++; |
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333 | } |
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334 | |
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335 | sub AnyEvent::Base::CondVar::wait { |
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336 | AnyEvent->one_event while !${$_[0]}; |
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337 | } |
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338 | |
| 313 | # default implementation for signal |
339 | # default implementation for ->signal |
| 314 | |
340 | |
| 315 | our %SIG_CB; |
341 | our %SIG_CB; |
| 316 | |
342 | |
| 317 | sub signal { |
343 | sub signal { |
| 318 | my (undef, %arg) = @_; |
344 | my (undef, %arg) = @_; |
| 319 | |
345 | |
| 320 | my $signal = uc $arg{signal} |
346 | my $signal = uc $arg{signal} |
| 321 | or Carp::croak "required option 'signal' is missing"; |
347 | or Carp::croak "required option 'signal' is missing"; |
| 322 | |
348 | |
| 323 | my $w = bless [$signal, $arg{cb}], "AnyEvent::Base::Signal"; |
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| 324 | |
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| 325 | $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; |
349 | $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; |
| 326 | $SIG{$signal} ||= sub { |
350 | $SIG{$signal} ||= sub { |
| 327 | $_->() for values %{ $SIG_CB{$signal} }; |
351 | $_->() for values %{ $SIG_CB{$signal} || {} }; |
| 328 | }; |
352 | }; |
| 329 | |
353 | |
| 330 | $w |
354 | bless [$signal, $arg{cb}], "AnyEvent::Base::Signal" |
| 331 | } |
355 | } |
| 332 | |
356 | |
| 333 | sub AnyEvent::Base::Signal::DESTROY { |
357 | sub AnyEvent::Base::Signal::DESTROY { |
| 334 | my ($signal, $cb) = @{$_[0]}; |
358 | my ($signal, $cb) = @{$_[0]}; |
| 335 | |
359 | |
| 336 | delete $SIG_CB{$signal}{$cb}; |
360 | delete $SIG_CB{$signal}{$cb}; |
| 337 | |
361 | |
| 338 | $SIG{$signal} = 'DEFAULT' unless keys %{ $SIG_CB{$signal} }; |
362 | $SIG{$signal} = 'DEFAULT' unless keys %{ $SIG_CB{$signal} }; |
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363 | } |
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364 | |
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365 | # default implementation for ->child |
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366 | |
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367 | our %PID_CB; |
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368 | our $CHLD_W; |
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369 | our $PID_IDLE; |
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370 | our $WNOHANG; |
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371 | |
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372 | sub _child_wait { |
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373 | while (0 < (my $pid = waitpid -1, $WNOHANG)) { |
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374 | $_->() for values %{ (delete $PID_CB{$pid}) || {} }; |
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375 | } |
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376 | |
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377 | undef $PID_IDLE; |
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378 | } |
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379 | |
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380 | sub child { |
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381 | my (undef, %arg) = @_; |
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382 | |
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383 | my $pid = uc $arg{pid} |
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384 | or Carp::croak "required option 'pid' is missing"; |
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385 | |
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386 | $PID_CB{$pid}{$arg{cb}} = $arg{cb}; |
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387 | |
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388 | unless ($WNOHANG) { |
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389 | $CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_child_wait); |
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390 | $WNOHANG = eval { require POSIX; &POSIX::WNOHANG } || 1; |
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391 | } |
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392 | |
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393 | # child could be a zombie already |
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394 | $PID_IDLE ||= AnyEvent->timer (after => 0, cb => \&_child_wait); |
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395 | |
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396 | bless [$pid, $arg{cb}], "AnyEvent::Base::Child" |
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397 | } |
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398 | |
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399 | sub AnyEvent::Base::Child::DESTROY { |
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400 | my ($pid, $cb) = @{$_[0]}; |
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401 | |
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402 | delete $PID_CB{$pid}{$cb}; |
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403 | delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} }; |
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404 | |
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405 | undef $CHLD_W unless keys %PID_CB; |
| 339 | } |
406 | } |
| 340 | |
407 | |
| 341 | =head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE |
408 | =head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE |
| 342 | |
409 | |
| 343 | If you need to support another event library which isn't directly |
410 | If you need to support another event library which isn't directly |
