… | |
… | |
415 | not restart syscalls (that includes L<Async::Interrupt> and AnyEvent's |
415 | not restart syscalls (that includes L<Async::Interrupt> and AnyEvent's |
416 | pure perl implementation). |
416 | pure perl implementation). |
417 | |
417 | |
418 | =head3 Safe/Unsafe Signals |
418 | =head3 Safe/Unsafe Signals |
419 | |
419 | |
420 | Perl signals can be either "safe" (synchronous to opcode handling) or |
420 | Perl signals can be either "safe" (synchronous to opcode handling) |
421 | "unsafe" (asynchronous) - the former might get delayed indefinitely, the |
421 | or "unsafe" (asynchronous) - the former might delay signal delivery |
422 | latter might corrupt your memory. |
422 | indefinitely, the latter might corrupt your memory. |
423 | |
423 | |
424 | AnyEvent signal handlers are, in addition, synchronous to the event loop, |
424 | AnyEvent signal handlers are, in addition, synchronous to the event loop, |
425 | i.e. they will not interrupt your running perl program but will only be |
425 | i.e. they will not interrupt your running perl program but will only be |
426 | called as part of the normal event handling (just like timer, I/O etc. |
426 | called as part of the normal event handling (just like timer, I/O etc. |
427 | callbacks, too). |
427 | callbacks, too). |
428 | |
428 | |
429 | =head3 Signal Races, Delays and Workarounds |
429 | =head3 Signal Races, Delays and Workarounds |
430 | |
430 | |
431 | Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching |
431 | Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support |
432 | callbacks to signals in a generic way, which is a pity, as you cannot |
432 | attaching callbacks to signals in a generic way, which is a pity, |
433 | do race-free signal handling in perl, requiring C libraries for |
433 | as you cannot do race-free signal handling in perl, requiring |
434 | this. AnyEvent will try to do its best, which means in some cases, |
434 | C libraries for this. AnyEvent will try to do its best, which |
435 | signals will be delayed. The maximum time a signal might be delayed is |
435 | means in some cases, signals will be delayed. The maximum time |
436 | specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10 seconds). This |
436 | a signal might be delayed is 10 seconds by default, but can |
437 | variable can be changed only before the first signal watcher is created, |
437 | be overriden via C<$ENV{PERL_ANYEVENT_MAX_SIGNAL_LATENCY}> or |
438 | and should be left alone otherwise. This variable determines how often |
438 | C<$AnyEvent::MAX_SIGNAL_LATENCY> - see the L<ENVIRONMENT VARIABLES> |
439 | AnyEvent polls for signals (in case a wake-up was missed). Higher values |
439 | section for details. |
440 | will cause fewer spurious wake-ups, which is better for power and CPU |
|
|
441 | saving. |
|
|
442 | |
440 | |
443 | All these problems can be avoided by installing the optional |
441 | All these problems can be avoided by installing the optional |
444 | L<Async::Interrupt> module, which works with most event loops. It will not |
442 | L<Async::Interrupt> module, which works with most event loops. It will not |
445 | work with inherently broken event loops such as L<Event> or L<Event::Lib> |
443 | work with inherently broken event loops such as L<Event> or L<Event::Lib> |
446 | (and not with L<POE> currently, as POE does its own workaround with |
444 | (and not with L<POE> currently). For those, you just have to suffer the |
447 | one-second latency). For those, you just have to suffer the delays. |
445 | delays. |
448 | |
446 | |
449 | =head2 CHILD PROCESS WATCHERS |
447 | =head2 CHILD PROCESS WATCHERS |
450 | |
448 | |
451 | $w = AnyEvent->child (pid => <process id>, cb => <callback>); |
449 | $w = AnyEvent->child (pid => <process id>, cb => <callback>); |
452 | |
450 | |
… | |
… | |
1235 | |
1233 | |
1236 | BEGIN { AnyEvent::common_sense } |
1234 | BEGIN { AnyEvent::common_sense } |
1237 | |
1235 | |
1238 | use Carp (); |
1236 | use Carp (); |
1239 | |
1237 | |
1240 | our $VERSION = '6.02'; |
1238 | our $VERSION = '6.14'; |
1241 | our $MODEL; |
1239 | our $MODEL; |
1242 | our @ISA; |
1240 | our @ISA; |
1243 | our @REGISTRY; |
1241 | our @REGISTRY; |
1244 | our $VERBOSE; |
1242 | our $VERBOSE; |
1245 | our $MAX_SIGNAL_LATENCY = 10; |
|
|
1246 | our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred |
1243 | our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred |
|
|
1244 | our $MAX_SIGNAL_LATENCY = $ENV{PERL_ANYEVENT_MAX_SIGNAL_LATENCY} || 10; # executes after the BEGIN block below (tainting!) |
1247 | |
1245 | |
1248 | BEGIN { |
1246 | BEGIN { |
1249 | require "AnyEvent/constants.pl"; |
1247 | require "AnyEvent/constants.pl"; |
1250 | |
1248 | |
1251 | eval "sub TAINT (){" . (${^TAINT}*1) . "}"; |
1249 | eval "sub TAINT (){" . (${^TAINT}*1) . "}"; |
… | |
… | |
1259 | @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} = () |
1257 | @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} = () |
1260 | if ${^TAINT}; |
1258 | if ${^TAINT}; |
1261 | |
1259 | |
1262 | # $ENV{PERL_ANYEVENT_xxx} now valid |
1260 | # $ENV{PERL_ANYEVENT_xxx} now valid |
1263 | |
1261 | |
1264 | $VERBOSE = length $ENV{PERL_ANYEVENT_VERBOSE} ? $ENV{PERL_ANYEVENT_VERBOSE}*1 : 3; |
1262 | $VERBOSE = length $ENV{PERL_ANYEVENT_VERBOSE} ? $ENV{PERL_ANYEVENT_VERBOSE}*1 : 4; |
1265 | |
1263 | |
1266 | my $idx; |
1264 | my $idx; |
1267 | $PROTOCOL{$_} = ++$idx |
1265 | $PROTOCOL{$_} = ++$idx |
1268 | for reverse split /\s*,\s*/, |
1266 | for reverse split /\s*,\s*/, |
1269 | $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6"; |
1267 | $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6"; |
… | |
… | |
1303 | () |
1301 | () |
1304 | } |
1302 | } |
1305 | |
1303 | |
1306 | sub log($$;@) { |
1304 | sub log($$;@) { |
1307 | # only load the big bloated module when we actually are about to log something |
1305 | # only load the big bloated module when we actually are about to log something |
1308 | if ($_[0] <= $VERBOSE) { # also catches non-numeric levels(!) |
1306 | if ($_[0] <= ($VERBOSE || 1)) { # also catches non-numeric levels(!) and fatal |
1309 | require AnyEvent::Log; |
1307 | local ($!, $@); |
|
|
1308 | require AnyEvent::Log; # among other things, sets $VERBOSE to 9 |
1310 | # AnyEvent::Log overwrites this function |
1309 | # AnyEvent::Log overwrites this function |
1311 | goto &log; |
1310 | goto &log; |
1312 | } |
1311 | } |
1313 | |
1312 | |
1314 | 0 # not logged |
1313 | 0 # not logged |
1315 | } |
1314 | } |
1316 | |
1315 | |
|
|
1316 | sub _logger($;$) { |
|
|
1317 | my ($level, $renabled) = @_; |
|
|
1318 | |
|
|
1319 | $$renabled = $level <= $VERBOSE; |
|
|
1320 | |
|
|
1321 | my $logger = [(caller)[0], $level, $renabled]; |
|
|
1322 | |
|
|
1323 | $AnyEvent::Log::LOGGER{$logger+0} = $logger; |
|
|
1324 | |
|
|
1325 | # return unless defined wantarray; |
|
|
1326 | # |
|
|
1327 | # require AnyEvent::Util; |
|
|
1328 | # my $guard = AnyEvent::Util::guard (sub { |
|
|
1329 | # # "clean up" |
|
|
1330 | # delete $LOGGER{$logger+0}; |
|
|
1331 | # }); |
|
|
1332 | # |
|
|
1333 | # sub { |
|
|
1334 | # return 0 unless $$renabled; |
|
|
1335 | # |
|
|
1336 | # $guard if 0; # keep guard alive, but don't cause runtime overhead |
|
|
1337 | # require AnyEvent::Log unless $AnyEvent::Log::VERSION; |
|
|
1338 | # package AnyEvent::Log; |
|
|
1339 | # _log ($logger->[0], $level, @_) # logger->[0] has been converted at load time |
|
|
1340 | # } |
|
|
1341 | } |
|
|
1342 | |
1317 | if (length $ENV{PERL_ANYEVENT_LOG}) { |
1343 | if (length $ENV{PERL_ANYEVENT_LOG}) { |
1318 | require AnyEvent::Log; # AnyEvent::Log does the thing for us |
1344 | require AnyEvent::Log; # AnyEvent::Log does the thing for us |
1319 | } |
1345 | } |
1320 | |
1346 | |
1321 | our @models = ( |
1347 | our @models = ( |
1322 | [EV:: => AnyEvent::Impl::EV:: , 1], |
1348 | [EV:: => AnyEvent::Impl::EV::], |
1323 | [AnyEvent::Loop:: => AnyEvent::Impl::Perl:: , 1], |
1349 | [AnyEvent::Loop:: => AnyEvent::Impl::Perl::], |
1324 | # everything below here will not (normally) be autoprobed |
1350 | # everything below here will not (normally) be autoprobed |
1325 | # as the pure perl backend should work everywhere |
1351 | # as the pure perl backend should work everywhere |
1326 | # and is usually faster |
1352 | # and is usually faster |
|
|
1353 | [Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package, so msut be near the top |
1327 | [Event:: => AnyEvent::Impl::Event::, 1], |
1354 | [Event:: => AnyEvent::Impl::Event::], # slow, stable |
1328 | [Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers |
1355 | [Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers |
|
|
1356 | # everything below here should not be autoloaded |
1329 | [Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy |
1357 | [Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy |
1330 | [Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package |
|
|
1331 | [Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles |
1358 | [Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles |
1332 | [Qt:: => AnyEvent::Impl::Qt::], # requires special main program |
1359 | [Qt:: => AnyEvent::Impl::Qt::], # requires special main program |
1333 | [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza |
1360 | [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza |
1334 | [Wx:: => AnyEvent::Impl::POE::], |
1361 | [Wx:: => AnyEvent::Impl::POE::], |
1335 | [Prima:: => AnyEvent::Impl::POE::], |
1362 | [Prima:: => AnyEvent::Impl::POE::], |
… | |
… | |
1364 | our @methods = qw(io timer time now now_update signal child idle condvar); |
1391 | our @methods = qw(io timer time now now_update signal child idle condvar); |
1365 | |
1392 | |
1366 | sub detect() { |
1393 | sub detect() { |
1367 | return $MODEL if $MODEL; # some programs keep references to detect |
1394 | return $MODEL if $MODEL; # some programs keep references to detect |
1368 | |
1395 | |
|
|
1396 | # IO::Async::Loop::AnyEvent is extremely evil, refuse to work with it |
|
|
1397 | # the author knows about the problems and what it does to AnyEvent as a whole |
|
|
1398 | # (and the ability of others to use AnyEvent), but simply wants to abuse AnyEvent |
|
|
1399 | # anyway. |
|
|
1400 | AnyEvent::log fatal => "AnyEvent: IO::Async::Loop::AnyEvent detected - that module is broken by\n" |
|
|
1401 | . "design, abuses internals and breaks AnyEvent - will not continue." |
|
|
1402 | if exists $INC{"IO/Async/Loop/AnyEvent.pm"}; |
|
|
1403 | |
1369 | local $!; # for good measure |
1404 | local $!; # for good measure |
1370 | local $SIG{__DIE__}; # we use eval |
1405 | local $SIG{__DIE__}; # we use eval |
1371 | |
1406 | |
1372 | # free some memory |
1407 | # free some memory |
1373 | *detect = sub () { $MODEL }; |
1408 | *detect = sub () { $MODEL }; |
… | |
… | |
1384 | $model = "AnyEvent::Impl::$model" unless $model =~ s/::$//; |
1419 | $model = "AnyEvent::Impl::$model" unless $model =~ s/::$//; |
1385 | if (eval "require $model") { |
1420 | if (eval "require $model") { |
1386 | AnyEvent::log 7 => "loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it."; |
1421 | AnyEvent::log 7 => "loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it."; |
1387 | $MODEL = $model; |
1422 | $MODEL = $model; |
1388 | } else { |
1423 | } else { |
1389 | AnyEvent::log 5 => "unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@"; |
1424 | AnyEvent::log 4 => "unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@"; |
1390 | } |
1425 | } |
1391 | } |
1426 | } |
1392 | |
1427 | |
1393 | # check for already loaded models |
1428 | # check for already loaded models |
1394 | unless ($MODEL) { |
1429 | unless ($MODEL) { |
… | |
… | |
1397 | if (${"$package\::VERSION"} > 0) { |
1432 | if (${"$package\::VERSION"} > 0) { |
1398 | if (eval "require $model") { |
1433 | if (eval "require $model") { |
1399 | AnyEvent::log 7 => "autodetected model '$model', using it."; |
1434 | AnyEvent::log 7 => "autodetected model '$model', using it."; |
1400 | $MODEL = $model; |
1435 | $MODEL = $model; |
1401 | last; |
1436 | last; |
|
|
1437 | } else { |
|
|
1438 | AnyEvent::log 8 => "detected event loop $package, but cannot load '$model', skipping: $@"; |
1402 | } |
1439 | } |
1403 | } |
1440 | } |
1404 | } |
1441 | } |
1405 | |
1442 | |
1406 | unless ($MODEL) { |
1443 | unless ($MODEL) { |
1407 | # try to autoload a model |
1444 | # try to autoload a model |
1408 | for (@REGISTRY, @models) { |
1445 | for (@REGISTRY, @models) { |
1409 | my ($package, $model, $autoload) = @$_; |
1446 | my ($package, $model) = @$_; |
1410 | if ( |
1447 | if ( |
1411 | $autoload |
|
|
1412 | and eval "require $package" |
1448 | eval "require $package" |
1413 | and ${"$package\::VERSION"} > 0 |
1449 | and ${"$package\::VERSION"} > 0 |
1414 | and eval "require $model" |
1450 | and eval "require $model" |
1415 | ) { |
1451 | ) { |
1416 | AnyEvent::log 7 => "autoloaded model '$model', using it."; |
1452 | AnyEvent::log 7 => "autoloaded model '$model', using it."; |
1417 | $MODEL = $model; |
1453 | $MODEL = $model; |
1418 | last; |
1454 | last; |
1419 | } |
1455 | } |
1420 | } |
1456 | } |
1421 | |
1457 | |
1422 | $MODEL |
1458 | $MODEL |
1423 | or die "AnyEvent: backend autodetection failed - did you properly install AnyEvent?"; |
1459 | or AnyEvent::log fatal => "AnyEvent: backend autodetection failed - did you properly install AnyEvent?"; |
1424 | } |
1460 | } |
1425 | } |
1461 | } |
1426 | |
1462 | |
1427 | # free memory only needed for probing |
1463 | # free memory only needed for probing |
1428 | undef @models; |
1464 | undef @models; |
… | |
… | |
2189 | |
2225 | |
2190 | The default value for the C<max_outstanding> parameter for the default DNS |
2226 | The default value for the C<max_outstanding> parameter for the default DNS |
2191 | resolver - this is the maximum number of parallel DNS requests that are |
2227 | resolver - this is the maximum number of parallel DNS requests that are |
2192 | sent to the DNS server. |
2228 | sent to the DNS server. |
2193 | |
2229 | |
|
|
2230 | =item C<PERL_ANYEVENT_MAX_SIGNAL_LATENCY> |
|
|
2231 | |
|
|
2232 | Perl has inherently racy signal handling (you can basically choose between |
|
|
2233 | losing signals and memory corruption) - pure perl event loops (including |
|
|
2234 | C<AnyEvent::Loop>, when C<Async::Interrupt> isn't available) therefore |
|
|
2235 | have to poll regularly to avoid losing signals. |
|
|
2236 | |
|
|
2237 | Some event loops are racy, but don't poll regularly, and some event loops |
|
|
2238 | are written in C but are still racy. For those event loops, AnyEvent |
|
|
2239 | installs a timer that regularly wakes up the event loop. |
|
|
2240 | |
|
|
2241 | By default, the interval for this timer is C<10> seconds, but you can |
|
|
2242 | override this delay with this environment variable (or by setting |
|
|
2243 | the C<$AnyEvent::MAX_SIGNAL_LATENCY> variable before creating signal |
|
|
2244 | watchers). |
|
|
2245 | |
|
|
2246 | Lower values increase CPU (and energy) usage, higher values can introduce |
|
|
2247 | long delays when reaping children or waiting for signals. |
|
|
2248 | |
|
|
2249 | The L<AnyEvent::Async> module, if available, will be used to avoid this |
|
|
2250 | polling (with most event loops). |
|
|
2251 | |
2194 | =item C<PERL_ANYEVENT_RESOLV_CONF> |
2252 | =item C<PERL_ANYEVENT_RESOLV_CONF> |
2195 | |
2253 | |
2196 | The absolute path to a F<resolv.conf>-style file to use instead of |
2254 | The absolute path to a F<resolv.conf>-style file to use instead of |
2197 | F</etc/resolv.conf> (or the OS-specific configuration) in the default |
2255 | F</etc/resolv.conf> (or the OS-specific configuration) in the default |
2198 | resolver, or the empty string to select the default configuration. |
2256 | resolver, or the empty string to select the default configuration. |