| … | |
… | |
| 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) . "}"; |
| … | |
… | |
| 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 || 1)) { # also catches non-numeric levels(!) and fatal |
1306 | if ($_[0] <= ($VERBOSE || 1)) { # also catches non-numeric levels(!) and fatal |
|
|
1307 | local ($!, $@); |
| 1309 | require AnyEvent::Log; # among other things, sets $VERBOSE to 9 |
1308 | require AnyEvent::Log; # among other things, sets $VERBOSE to 9 |
| 1310 | # AnyEvent::Log overwrites this function |
1309 | # AnyEvent::Log overwrites this function |
| 1311 | goto &log; |
1310 | goto &log; |
| 1312 | } |
1311 | } |
| 1313 | |
1312 | |
| 1314 | 0 # not logged |
1313 | 0 # not logged |
| 1315 | } |
1314 | } |
| 1316 | |
1315 | |
| 1317 | sub logger($;$) { |
1316 | sub _logger($;$) { |
| 1318 | package AnyEvent::Log; |
|
|
| 1319 | |
|
|
| 1320 | my ($level, $renabled) = @_; |
1317 | my ($level, $renabled) = @_; |
| 1321 | |
1318 | |
| 1322 | $$renabled = $level <= $VERBOSE; |
1319 | $$renabled = $level <= $VERBOSE; |
| 1323 | |
1320 | |
| 1324 | my $pkg = (caller)[0]; |
|
|
| 1325 | |
|
|
| 1326 | my $logger = [$pkg, $level, $renabled]; |
1321 | my $logger = [(caller)[0], $level, $renabled]; |
| 1327 | |
1322 | |
| 1328 | our %LOGGER; |
|
|
| 1329 | $LOGGER{$logger+0} = $logger; |
1323 | $AnyEvent::Log::LOGGER{$logger+0} = $logger; |
| 1330 | |
1324 | |
|
|
1325 | # return unless defined wantarray; |
|
|
1326 | # |
| 1331 | require AnyEvent::Util; |
1327 | # require AnyEvent::Util; |
| 1332 | my $guard = AnyEvent::Util::guard (sub { |
1328 | # my $guard = AnyEvent::Util::guard (sub { |
| 1333 | # "clean up" |
1329 | # # "clean up" |
| 1334 | delete $LOGGER{$logger+0}; |
1330 | # delete $LOGGER{$logger+0}; |
| 1335 | }); |
1331 | # }); |
| 1336 | |
1332 | # |
| 1337 | sub { |
1333 | # sub { |
| 1338 | return 0 unless $$renabled; |
1334 | # return 0 unless $$renabled; |
| 1339 | |
1335 | # |
| 1340 | $guard if 0; # keep guard alive, but don't cause runtime overhead |
1336 | # $guard if 0; # keep guard alive, but don't cause runtime overhead |
| 1341 | require AnyEvent::Log unless $AnyEvent::Log::VERSION; |
1337 | # require AnyEvent::Log unless $AnyEvent::Log::VERSION; |
| 1342 | package AnyEvent::Log; |
1338 | # package AnyEvent::Log; |
| 1343 | _log ($logger->[0], $level, @_) # logger->[0] has been converted at load time |
1339 | # _log ($logger->[0], $level, @_) # logger->[0] has been converted at load time |
| 1344 | } |
1340 | # } |
| 1345 | } |
1341 | } |
| 1346 | |
1342 | |
| 1347 | if (length $ENV{PERL_ANYEVENT_LOG}) { |
1343 | if (length $ENV{PERL_ANYEVENT_LOG}) { |
| 1348 | require AnyEvent::Log; # AnyEvent::Log does the thing for us |
1344 | require AnyEvent::Log; # AnyEvent::Log does the thing for us |
| 1349 | } |
1345 | } |
| … | |
… | |
| 1395 | 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); |
| 1396 | |
1392 | |
| 1397 | sub detect() { |
1393 | sub detect() { |
| 1398 | return $MODEL if $MODEL; # some programs keep references to detect |
1394 | return $MODEL if $MODEL; # some programs keep references to detect |
| 1399 | |
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 | |
| 1400 | local $!; # for good measure |
1404 | local $!; # for good measure |
| 1401 | local $SIG{__DIE__}; # we use eval |
1405 | local $SIG{__DIE__}; # we use eval |
| 1402 | |
1406 | |
| 1403 | # free some memory |
1407 | # free some memory |
| 1404 | *detect = sub () { $MODEL }; |
1408 | *detect = sub () { $MODEL }; |
| … | |
… | |
| 1428 | if (${"$package\::VERSION"} > 0) { |
1432 | if (${"$package\::VERSION"} > 0) { |
| 1429 | if (eval "require $model") { |
1433 | if (eval "require $model") { |
| 1430 | AnyEvent::log 7 => "autodetected model '$model', using it."; |
1434 | AnyEvent::log 7 => "autodetected model '$model', using it."; |
| 1431 | $MODEL = $model; |
1435 | $MODEL = $model; |
| 1432 | last; |
1436 | last; |
|
|
1437 | } else { |
|
|
1438 | AnyEvent::log 8 => "detected event loop $package, but cannot load '$model', skipping: $@"; |
| 1433 | } |
1439 | } |
| 1434 | } |
1440 | } |
| 1435 | } |
1441 | } |
| 1436 | |
1442 | |
| 1437 | unless ($MODEL) { |
1443 | unless ($MODEL) { |
| … | |
… | |
| 2219 | |
2225 | |
| 2220 | The default value for the C<max_outstanding> parameter for the default DNS |
2226 | The default value for the C<max_outstanding> parameter for the default DNS |
| 2221 | resolver - this is the maximum number of parallel DNS requests that are |
2227 | resolver - this is the maximum number of parallel DNS requests that are |
| 2222 | sent to the DNS server. |
2228 | sent to the DNS server. |
| 2223 | |
2229 | |
|
|
2230 | =item C<PERL_ANYEVENT_MAX_SIGNAL_LATENCY> |
|
|
2231 | |
|
|
2232 | Perl has inherently racy signal handling (you can basically choose between |
|
|
2233 | losing signals and memory corruption) - pure perl event loops (including |
|
|
2234 | C<AnyEvent::Loop>, when C<Async::Interrupt> isn't available) therefore |
|
|
2235 | have to poll regularly to avoid losing signals. |
|
|
2236 | |
|
|
2237 | Some event loops are racy, but don't poll regularly, and some event loops |
|
|
2238 | are written in C but are still racy. For those event loops, AnyEvent |
|
|
2239 | installs a timer that regularly wakes up the event loop. |
|
|
2240 | |
|
|
2241 | By default, the interval for this timer is C<10> seconds, but you can |
|
|
2242 | override this delay with this environment variable (or by setting |
|
|
2243 | the C<$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 | |
| 2224 | =item C<PERL_ANYEVENT_RESOLV_CONF> |
2252 | =item C<PERL_ANYEVENT_RESOLV_CONF> |
| 2225 | |
2253 | |
| 2226 | 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 |
| 2227 | 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 |
| 2228 | resolver, or the empty string to select the default configuration. |
2256 | resolver, or the empty string to select the default configuration. |
