… | |
… | |
7 | |
7 | |
8 | =head1 SYNOPSIS |
8 | =head1 SYNOPSIS |
9 | |
9 | |
10 | use AnyEvent; |
10 | use AnyEvent; |
11 | |
11 | |
|
|
12 | # if you prefer function calls, look at the AE manpage for |
|
|
13 | # an alternative API. |
|
|
14 | |
12 | # file descriptor readable |
15 | # file handle or descriptor readable |
13 | my $w = AnyEvent->io (fh => $fh, poll => "r", cb => sub { ... }); |
16 | my $w = AnyEvent->io (fh => $fh, poll => "r", cb => sub { ... }); |
14 | |
17 | |
15 | # one-shot or repeating timers |
18 | # one-shot or repeating timers |
16 | my $w = AnyEvent->timer (after => $seconds, cb => sub { ... }); |
19 | my $w = AnyEvent->timer (after => $seconds, cb => sub { ... }); |
17 | my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ... |
20 | my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ... |
… | |
… | |
503 | |
506 | |
504 | =head2 IDLE WATCHERS |
507 | =head2 IDLE WATCHERS |
505 | |
508 | |
506 | $w = AnyEvent->idle (cb => <callback>); |
509 | $w = AnyEvent->idle (cb => <callback>); |
507 | |
510 | |
508 | Sometimes there is a need to do something, but it is not so important |
511 | Repeatedly invoke the callback after the process becomes idle, until |
509 | to do it instantly, but only when there is nothing better to do. This |
512 | either the watcher is destroyed or new events have been detected. |
510 | "nothing better to do" is usually defined to be "no other events need |
|
|
511 | attention by the event loop". |
|
|
512 | |
513 | |
513 | Idle watchers ideally get invoked when the event loop has nothing |
514 | Idle watchers are useful when there is a need to do something, but it |
514 | better to do, just before it would block the process to wait for new |
515 | is not so important (or wise) to do it instantly. The callback will be |
515 | events. Instead of blocking, the idle watcher is invoked. |
516 | invoked only when there is "nothing better to do", which is usually |
|
|
517 | defined as "all outstanding events have been handled and no new events |
|
|
518 | have been detected". That means that idle watchers ideally get invoked |
|
|
519 | when the event loop has just polled for new events but none have been |
|
|
520 | detected. Instead of blocking to wait for more events, the idle watchers |
|
|
521 | will be invoked. |
516 | |
522 | |
517 | Most event loops unfortunately do not really support idle watchers (only |
523 | Unfortunately, most event loops do not really support idle watchers (only |
518 | EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent |
524 | EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent |
519 | will simply call the callback "from time to time". |
525 | will simply call the callback "from time to time". |
520 | |
526 | |
521 | Example: read lines from STDIN, but only process them when the |
527 | Example: read lines from STDIN, but only process them when the |
522 | program is otherwise idle: |
528 | program is otherwise idle: |
… | |
… | |
603 | eventually calls C<< -> send >>, and the "consumer side", which waits |
609 | eventually calls C<< -> send >>, and the "consumer side", which waits |
604 | for the send to occur. |
610 | for the send to occur. |
605 | |
611 | |
606 | Example: wait for a timer. |
612 | Example: wait for a timer. |
607 | |
613 | |
608 | # wait till the result is ready |
614 | # condition: "wait till the timer is fired" |
609 | my $result_ready = AnyEvent->condvar; |
615 | my $timer_fired = AnyEvent->condvar; |
610 | |
616 | |
611 | # do something such as adding a timer |
617 | # create the timer - we could wait for, say |
612 | # or socket watcher the calls $result_ready->send |
618 | # a handle becomign ready, or even an |
613 | # when the "result" is ready. |
619 | # AnyEvent::HTTP request to finish, but |
614 | # in this case, we simply use a timer: |
620 | # in this case, we simply use a timer: |
615 | my $w = AnyEvent->timer ( |
621 | my $w = AnyEvent->timer ( |
616 | after => 1, |
622 | after => 1, |
617 | cb => sub { $result_ready->send }, |
623 | cb => sub { $timer_fired->send }, |
618 | ); |
624 | ); |
619 | |
625 | |
620 | # this "blocks" (while handling events) till the callback |
626 | # this "blocks" (while handling events) till the callback |
621 | # calls ->send |
627 | # calls ->send |
622 | $result_ready->recv; |
628 | $timer_fired->recv; |
623 | |
629 | |
624 | Example: wait for a timer, but take advantage of the fact that condition |
630 | Example: wait for a timer, but take advantage of the fact that condition |
625 | variables are also callable directly. |
631 | variables are also callable directly. |
626 | |
632 | |
627 | my $done = AnyEvent->condvar; |
633 | my $done = AnyEvent->condvar; |
… | |
… | |
1051 | =head1 OTHER MODULES |
1057 | =head1 OTHER MODULES |
1052 | |
1058 | |
1053 | The following is a non-exhaustive list of additional modules that use |
1059 | The following is a non-exhaustive list of additional modules that use |
1054 | AnyEvent as a client and can therefore be mixed easily with other AnyEvent |
1060 | AnyEvent as a client and can therefore be mixed easily with other AnyEvent |
1055 | modules and other event loops in the same program. Some of the modules |
1061 | modules and other event loops in the same program. Some of the modules |
1056 | come with AnyEvent, most are available via CPAN. |
1062 | come as part of AnyEvent, the others are available via CPAN. |
1057 | |
1063 | |
1058 | =over 4 |
1064 | =over 4 |
1059 | |
1065 | |
1060 | =item L<AnyEvent::Util> |
1066 | =item L<AnyEvent::Util> |
1061 | |
1067 | |
… | |
… | |
1076 | |
1082 | |
1077 | =item L<AnyEvent::DNS> |
1083 | =item L<AnyEvent::DNS> |
1078 | |
1084 | |
1079 | Provides rich asynchronous DNS resolver capabilities. |
1085 | Provides rich asynchronous DNS resolver capabilities. |
1080 | |
1086 | |
|
|
1087 | =item L<AnyEvent::HTTP>, L<AnyEvent::IRC>, L<AnyEvent::XMPP>, L<AnyEvent::GPSD>, L<AnyEvent::IGS>, L<AnyEvent::FCP> |
|
|
1088 | |
|
|
1089 | Implement event-based interfaces to the protocols of the same name (for |
|
|
1090 | the curious, IGS is the International Go Server and FCP is the Freenet |
|
|
1091 | Client Protocol). |
|
|
1092 | |
|
|
1093 | =item L<AnyEvent::Handle::UDP> |
|
|
1094 | |
|
|
1095 | Here be danger! |
|
|
1096 | |
|
|
1097 | As Pauli would put it, "Not only is it not right, it's not even wrong!" - |
|
|
1098 | there are so many things wrong with AnyEvent::Handle::UDP, most notably |
|
|
1099 | it's use of a stream-based API with a protocol that isn't streamable, that |
|
|
1100 | the only way to improve it is to delete it. |
|
|
1101 | |
|
|
1102 | It features data corruption (but typically only under load) and general |
|
|
1103 | confusion. On top, the author is not only clueless about UDP but also |
|
|
1104 | fact-resistant - some gems of his understanding: "connect doesn't work |
|
|
1105 | with UDP", "UDP packets are not IP packets", "UDP only has datagrams, not |
|
|
1106 | packets", "I don't need to implement proper error checking as UDP doesn't |
|
|
1107 | support error checking" and so on - he doesn't even understand what's |
|
|
1108 | wrong with his module when it is explained to him. |
|
|
1109 | |
1081 | =item L<AnyEvent::HTTP> |
1110 | =item L<AnyEvent::DBI> |
1082 | |
1111 | |
1083 | A simple-to-use HTTP library that is capable of making a lot of concurrent |
1112 | Executes L<DBI> requests asynchronously in a proxy process for you, |
1084 | HTTP requests. |
1113 | notifying you in an event-bnased way when the operation is finished. |
|
|
1114 | |
|
|
1115 | =item L<AnyEvent::AIO> |
|
|
1116 | |
|
|
1117 | Truly asynchronous (as opposed to non-blocking) I/O, should be in the |
|
|
1118 | toolbox of every event programmer. AnyEvent::AIO transparently fuses |
|
|
1119 | L<IO::AIO> and AnyEvent together, giving AnyEvent access to event-based |
|
|
1120 | file I/O, and much more. |
1085 | |
1121 | |
1086 | =item L<AnyEvent::HTTPD> |
1122 | =item L<AnyEvent::HTTPD> |
1087 | |
1123 | |
1088 | Provides a simple web application server framework. |
1124 | A simple embedded webserver. |
1089 | |
1125 | |
1090 | =item L<AnyEvent::FastPing> |
1126 | =item L<AnyEvent::FastPing> |
1091 | |
1127 | |
1092 | The fastest ping in the west. |
1128 | The fastest ping in the west. |
1093 | |
|
|
1094 | =item L<AnyEvent::DBI> |
|
|
1095 | |
|
|
1096 | Executes L<DBI> requests asynchronously in a proxy process. |
|
|
1097 | |
|
|
1098 | =item L<AnyEvent::AIO> |
|
|
1099 | |
|
|
1100 | Truly asynchronous I/O, should be in the toolbox of every event |
|
|
1101 | programmer. AnyEvent::AIO transparently fuses L<IO::AIO> and AnyEvent |
|
|
1102 | together. |
|
|
1103 | |
|
|
1104 | =item L<AnyEvent::BDB> |
|
|
1105 | |
|
|
1106 | Truly asynchronous Berkeley DB access. AnyEvent::BDB transparently fuses |
|
|
1107 | L<BDB> and AnyEvent together. |
|
|
1108 | |
|
|
1109 | =item L<AnyEvent::GPSD> |
|
|
1110 | |
|
|
1111 | A non-blocking interface to gpsd, a daemon delivering GPS information. |
|
|
1112 | |
|
|
1113 | =item L<AnyEvent::IRC> |
|
|
1114 | |
|
|
1115 | AnyEvent based IRC client module family (replacing the older Net::IRC3). |
|
|
1116 | |
|
|
1117 | =item L<AnyEvent::XMPP> |
|
|
1118 | |
|
|
1119 | AnyEvent based XMPP (Jabber protocol) module family (replacing the older |
|
|
1120 | Net::XMPP2>. |
|
|
1121 | |
|
|
1122 | =item L<AnyEvent::IGS> |
|
|
1123 | |
|
|
1124 | A non-blocking interface to the Internet Go Server protocol (used by |
|
|
1125 | L<App::IGS>). |
|
|
1126 | |
|
|
1127 | =item L<Net::FCP> |
|
|
1128 | |
|
|
1129 | AnyEvent-based implementation of the Freenet Client Protocol, birthplace |
|
|
1130 | of AnyEvent. |
|
|
1131 | |
|
|
1132 | =item L<Event::ExecFlow> |
|
|
1133 | |
|
|
1134 | High level API for event-based execution flow control. |
|
|
1135 | |
1129 | |
1136 | =item L<Coro> |
1130 | =item L<Coro> |
1137 | |
1131 | |
1138 | Has special support for AnyEvent via L<Coro::AnyEvent>. |
1132 | Has special support for AnyEvent via L<Coro::AnyEvent>. |
1139 | |
1133 | |
… | |
… | |
1153 | |
1147 | |
1154 | BEGIN { AnyEvent::common_sense } |
1148 | BEGIN { AnyEvent::common_sense } |
1155 | |
1149 | |
1156 | use Carp (); |
1150 | use Carp (); |
1157 | |
1151 | |
1158 | our $VERSION = '5.22'; |
1152 | our $VERSION = '5.261'; |
1159 | our $MODEL; |
1153 | our $MODEL; |
1160 | |
1154 | |
1161 | our $AUTOLOAD; |
1155 | our $AUTOLOAD; |
1162 | our @ISA; |
1156 | our @ISA; |
1163 | |
1157 | |
1164 | our @REGISTRY; |
1158 | our @REGISTRY; |
1165 | |
1159 | |
1166 | our $VERBOSE; |
1160 | our $VERBOSE; |
1167 | |
1161 | |
1168 | BEGIN { |
1162 | BEGIN { |
1169 | eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }"; |
1163 | require "AnyEvent/constants.pl"; |
|
|
1164 | |
1170 | eval "sub TAINT(){ " . (${^TAINT}*1) . " }"; |
1165 | eval "sub TAINT (){" . (${^TAINT}*1) . "}"; |
1171 | |
1166 | |
1172 | delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} |
1167 | delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} |
1173 | if ${^TAINT}; |
1168 | if ${^TAINT}; |
1174 | |
1169 | |
1175 | $VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1; |
1170 | $VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1; |
… | |
… | |
1218 | our @post_detect; |
1213 | our @post_detect; |
1219 | |
1214 | |
1220 | sub post_detect(&) { |
1215 | sub post_detect(&) { |
1221 | my ($cb) = @_; |
1216 | my ($cb) = @_; |
1222 | |
1217 | |
1223 | if ($MODEL) { |
|
|
1224 | $cb->(); |
|
|
1225 | |
|
|
1226 | undef |
|
|
1227 | } else { |
|
|
1228 | push @post_detect, $cb; |
1218 | push @post_detect, $cb; |
1229 | |
1219 | |
1230 | defined wantarray |
1220 | defined wantarray |
1231 | ? bless \$cb, "AnyEvent::Util::postdetect" |
1221 | ? bless \$cb, "AnyEvent::Util::postdetect" |
1232 | : () |
1222 | : () |
1233 | } |
|
|
1234 | } |
1223 | } |
1235 | |
1224 | |
1236 | sub AnyEvent::Util::postdetect::DESTROY { |
1225 | sub AnyEvent::Util::postdetect::DESTROY { |
1237 | @post_detect = grep $_ != ${$_[0]}, @post_detect; |
1226 | @post_detect = grep $_ != ${$_[0]}, @post_detect; |
1238 | } |
1227 | } |
1239 | |
1228 | |
1240 | sub detect() { |
1229 | sub detect() { |
|
|
1230 | # free some memory |
|
|
1231 | *detect = sub () { $MODEL }; |
|
|
1232 | |
|
|
1233 | local $!; # for good measure |
|
|
1234 | local $SIG{__DIE__}; |
|
|
1235 | |
|
|
1236 | if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) { |
|
|
1237 | my $model = "AnyEvent::Impl::$1"; |
|
|
1238 | if (eval "require $model") { |
|
|
1239 | $MODEL = $model; |
|
|
1240 | warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2; |
|
|
1241 | } else { |
|
|
1242 | warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE; |
|
|
1243 | } |
|
|
1244 | } |
|
|
1245 | |
|
|
1246 | # check for already loaded models |
1241 | unless ($MODEL) { |
1247 | unless ($MODEL) { |
1242 | local $SIG{__DIE__}; |
1248 | for (@REGISTRY, @models) { |
1243 | |
1249 | my ($package, $model) = @$_; |
1244 | if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) { |
1250 | if (${"$package\::VERSION"} > 0) { |
1245 | my $model = "AnyEvent::Impl::$1"; |
|
|
1246 | if (eval "require $model") { |
1251 | if (eval "require $model") { |
1247 | $MODEL = $model; |
1252 | $MODEL = $model; |
1248 | warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2; |
1253 | warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2; |
1249 | } else { |
1254 | last; |
1250 | warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE; |
1255 | } |
1251 | } |
1256 | } |
1252 | } |
1257 | } |
1253 | |
1258 | |
1254 | # check for already loaded models |
|
|
1255 | unless ($MODEL) { |
1259 | unless ($MODEL) { |
|
|
1260 | # try to autoload a model |
1256 | for (@REGISTRY, @models) { |
1261 | for (@REGISTRY, @models) { |
1257 | my ($package, $model) = @$_; |
1262 | my ($package, $model, $autoload) = @$_; |
|
|
1263 | if ( |
|
|
1264 | $autoload |
|
|
1265 | and eval "require $package" |
1258 | if (${"$package\::VERSION"} > 0) { |
1266 | and ${"$package\::VERSION"} > 0 |
1259 | if (eval "require $model") { |
1267 | and eval "require $model" |
|
|
1268 | ) { |
1260 | $MODEL = $model; |
1269 | $MODEL = $model; |
1261 | warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2; |
1270 | warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2; |
1262 | last; |
1271 | last; |
1263 | } |
|
|
1264 | } |
1272 | } |
1265 | } |
1273 | } |
1266 | |
1274 | |
1267 | unless ($MODEL) { |
|
|
1268 | # try to autoload a model |
|
|
1269 | for (@REGISTRY, @models) { |
|
|
1270 | my ($package, $model, $autoload) = @$_; |
|
|
1271 | if ( |
|
|
1272 | $autoload |
|
|
1273 | and eval "require $package" |
|
|
1274 | and ${"$package\::VERSION"} > 0 |
|
|
1275 | and eval "require $model" |
|
|
1276 | ) { |
|
|
1277 | $MODEL = $model; |
|
|
1278 | warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2; |
|
|
1279 | last; |
|
|
1280 | } |
|
|
1281 | } |
|
|
1282 | |
|
|
1283 | $MODEL |
1275 | $MODEL |
1284 | or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n"; |
1276 | or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n"; |
1285 | } |
|
|
1286 | } |
1277 | } |
1287 | |
|
|
1288 | push @{"$MODEL\::ISA"}, "AnyEvent::Base"; |
|
|
1289 | |
|
|
1290 | unshift @ISA, $MODEL; |
|
|
1291 | |
|
|
1292 | require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT}; |
|
|
1293 | |
|
|
1294 | (shift @post_detect)->() while @post_detect; |
|
|
1295 | } |
1278 | } |
|
|
1279 | |
|
|
1280 | @models = (); # free probe data |
|
|
1281 | |
|
|
1282 | push @{"$MODEL\::ISA"}, "AnyEvent::Base"; |
|
|
1283 | unshift @ISA, $MODEL; |
|
|
1284 | |
|
|
1285 | # now nuke some methods that are overriden by the backend. |
|
|
1286 | # SUPER is not allowed. |
|
|
1287 | for (qw(time signal child idle)) { |
|
|
1288 | undef &{"AnyEvent::Base::$_"} |
|
|
1289 | if defined &{"$MODEL\::$_"}; |
|
|
1290 | } |
|
|
1291 | |
|
|
1292 | require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT}; |
|
|
1293 | |
|
|
1294 | (shift @post_detect)->() while @post_detect; |
|
|
1295 | |
|
|
1296 | *post_detect = sub(&) { |
|
|
1297 | shift->(); |
|
|
1298 | |
|
|
1299 | undef |
|
|
1300 | }; |
1296 | |
1301 | |
1297 | $MODEL |
1302 | $MODEL |
1298 | } |
1303 | } |
1299 | |
1304 | |
1300 | sub AUTOLOAD { |
1305 | sub AUTOLOAD { |
1301 | (my $func = $AUTOLOAD) =~ s/.*://; |
1306 | (my $func = $AUTOLOAD) =~ s/.*://; |
1302 | |
1307 | |
1303 | $method{$func} |
1308 | $method{$func} |
1304 | or Carp::croak "$func: not a valid method for AnyEvent objects"; |
1309 | or Carp::croak "$func: not a valid AnyEvent class method"; |
1305 | |
1310 | |
1306 | detect unless $MODEL; |
1311 | detect; |
1307 | |
1312 | |
1308 | my $class = shift; |
1313 | my $class = shift; |
1309 | $class->$func (@_); |
1314 | $class->$func (@_); |
1310 | } |
1315 | } |
1311 | |
1316 | |
… | |
… | |
1328 | |
1333 | |
1329 | =head1 SIMPLIFIED AE API |
1334 | =head1 SIMPLIFIED AE API |
1330 | |
1335 | |
1331 | Starting with version 5.0, AnyEvent officially supports a second, much |
1336 | Starting with version 5.0, AnyEvent officially supports a second, much |
1332 | simpler, API that is designed to reduce the calling, typing and memory |
1337 | simpler, API that is designed to reduce the calling, typing and memory |
1333 | overhead. |
1338 | overhead by using function call syntax and a fixed number of parameters. |
1334 | |
1339 | |
1335 | See the L<AE> manpage for details. |
1340 | See the L<AE> manpage for details. |
1336 | |
1341 | |
1337 | =cut |
1342 | =cut |
1338 | |
1343 | |
1339 | package AE; |
1344 | package AE; |
1340 | |
1345 | |
1341 | our $VERSION = $AnyEvent::VERSION; |
1346 | our $VERSION = $AnyEvent::VERSION; |
|
|
1347 | |
|
|
1348 | # fall back to the main API by default - backends and AnyEvent::Base |
|
|
1349 | # implementations can overwrite these. |
1342 | |
1350 | |
1343 | sub io($$$) { |
1351 | sub io($$$) { |
1344 | AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2]) |
1352 | AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2]) |
1345 | } |
1353 | } |
1346 | |
1354 | |
… | |
… | |
1378 | |
1386 | |
1379 | package AnyEvent::Base; |
1387 | package AnyEvent::Base; |
1380 | |
1388 | |
1381 | # default implementations for many methods |
1389 | # default implementations for many methods |
1382 | |
1390 | |
1383 | sub _time() { |
1391 | sub time { |
|
|
1392 | eval q{ # poor man's autoloading {} |
1384 | # probe for availability of Time::HiRes |
1393 | # probe for availability of Time::HiRes |
1385 | if (eval "use Time::HiRes (); Time::HiRes::time (); 1") { |
1394 | if (eval "use Time::HiRes (); Time::HiRes::time (); 1") { |
1386 | warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8; |
1395 | warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8; |
1387 | *_time = \&Time::HiRes::time; |
1396 | *AE::time = \&Time::HiRes::time; |
1388 | # if (eval "use POSIX (); (POSIX::times())... |
1397 | # if (eval "use POSIX (); (POSIX::times())... |
1389 | } else { |
1398 | } else { |
1390 | warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE; |
1399 | warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE; |
1391 | *_time = sub { time }; # epic fail |
1400 | *AE::time = sub (){ time }; # epic fail |
|
|
1401 | } |
|
|
1402 | |
|
|
1403 | *time = sub { AE::time }; # different prototypes |
1392 | } |
1404 | }; |
|
|
1405 | die if $@; |
1393 | |
1406 | |
1394 | &_time |
1407 | &time |
1395 | } |
1408 | } |
1396 | |
1409 | |
1397 | sub time { _time } |
1410 | *now = \&time; |
1398 | sub now { _time } |
1411 | |
1399 | sub now_update { } |
1412 | sub now_update { } |
1400 | |
1413 | |
1401 | # default implementation for ->condvar |
1414 | # default implementation for ->condvar |
1402 | |
1415 | |
1403 | sub condvar { |
1416 | sub condvar { |
|
|
1417 | eval q{ # poor man's autoloading {} |
|
|
1418 | *condvar = sub { |
1404 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar" |
1419 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar" |
|
|
1420 | }; |
|
|
1421 | |
|
|
1422 | *AE::cv = sub (;&) { |
|
|
1423 | bless { @_ ? (_ae_cb => shift) : () }, "AnyEvent::CondVar" |
|
|
1424 | }; |
|
|
1425 | }; |
|
|
1426 | die if $@; |
|
|
1427 | |
|
|
1428 | &condvar |
1405 | } |
1429 | } |
1406 | |
1430 | |
1407 | # default implementation for ->signal |
1431 | # default implementation for ->signal |
1408 | |
1432 | |
1409 | our $HAVE_ASYNC_INTERRUPT; |
1433 | our $HAVE_ASYNC_INTERRUPT; |
… | |
… | |
1418 | |
1442 | |
1419 | our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO); |
1443 | our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO); |
1420 | our (%SIG_ASY, %SIG_ASY_W); |
1444 | our (%SIG_ASY, %SIG_ASY_W); |
1421 | our ($SIG_COUNT, $SIG_TW); |
1445 | our ($SIG_COUNT, $SIG_TW); |
1422 | |
1446 | |
1423 | sub _signal_exec { |
|
|
1424 | $HAVE_ASYNC_INTERRUPT |
|
|
1425 | ? $SIGPIPE_R->drain |
|
|
1426 | : sysread $SIGPIPE_R, (my $dummy), 9; |
|
|
1427 | |
|
|
1428 | while (%SIG_EV) { |
|
|
1429 | for (keys %SIG_EV) { |
|
|
1430 | delete $SIG_EV{$_}; |
|
|
1431 | $_->() for values %{ $SIG_CB{$_} || {} }; |
|
|
1432 | } |
|
|
1433 | } |
|
|
1434 | } |
|
|
1435 | |
|
|
1436 | # install a dummy wakeup watcher to reduce signal catching latency |
1447 | # install a dummy wakeup watcher to reduce signal catching latency |
|
|
1448 | # used by Impls |
1437 | sub _sig_add() { |
1449 | sub _sig_add() { |
1438 | unless ($SIG_COUNT++) { |
1450 | unless ($SIG_COUNT++) { |
1439 | # try to align timer on a full-second boundary, if possible |
1451 | # try to align timer on a full-second boundary, if possible |
1440 | my $NOW = AE::now; |
1452 | my $NOW = AE::now; |
1441 | |
1453 | |
… | |
… | |
1451 | undef $SIG_TW |
1463 | undef $SIG_TW |
1452 | unless --$SIG_COUNT; |
1464 | unless --$SIG_COUNT; |
1453 | } |
1465 | } |
1454 | |
1466 | |
1455 | our $_sig_name_init; $_sig_name_init = sub { |
1467 | our $_sig_name_init; $_sig_name_init = sub { |
1456 | eval q{ # poor man's autoloading |
1468 | eval q{ # poor man's autoloading {} |
1457 | undef $_sig_name_init; |
1469 | undef $_sig_name_init; |
1458 | |
1470 | |
1459 | if (_have_async_interrupt) { |
1471 | if (_have_async_interrupt) { |
1460 | *sig2num = \&Async::Interrupt::sig2num; |
1472 | *sig2num = \&Async::Interrupt::sig2num; |
1461 | *sig2name = \&Async::Interrupt::sig2name; |
1473 | *sig2name = \&Async::Interrupt::sig2name; |
… | |
… | |
1493 | $SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec; |
1505 | $SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec; |
1494 | |
1506 | |
1495 | } else { |
1507 | } else { |
1496 | warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8; |
1508 | warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8; |
1497 | |
1509 | |
1498 | require Fcntl; |
|
|
1499 | |
|
|
1500 | if (AnyEvent::WIN32) { |
1510 | if (AnyEvent::WIN32) { |
1501 | require AnyEvent::Util; |
1511 | require AnyEvent::Util; |
1502 | |
1512 | |
1503 | ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe (); |
1513 | ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe (); |
1504 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R; |
1514 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R; |
1505 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case |
1515 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case |
1506 | } else { |
1516 | } else { |
1507 | pipe $SIGPIPE_R, $SIGPIPE_W; |
1517 | pipe $SIGPIPE_R, $SIGPIPE_W; |
1508 | fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R; |
1518 | fcntl $SIGPIPE_R, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_R; |
1509 | fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case |
1519 | fcntl $SIGPIPE_W, AnyEvent::F_SETFL, AnyEvent::O_NONBLOCK if $SIGPIPE_W; # just in case |
1510 | |
1520 | |
1511 | # not strictly required, as $^F is normally 2, but let's make sure... |
1521 | # not strictly required, as $^F is normally 2, but let's make sure... |
1512 | fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC; |
1522 | fcntl $SIGPIPE_R, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC; |
1513 | fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC; |
1523 | fcntl $SIGPIPE_W, AnyEvent::F_SETFD, AnyEvent::FD_CLOEXEC; |
1514 | } |
1524 | } |
1515 | |
1525 | |
1516 | $SIGPIPE_R |
1526 | $SIGPIPE_R |
1517 | or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n"; |
1527 | or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n"; |
1518 | |
1528 | |
1519 | $SIG_IO = AE::io $SIGPIPE_R, 0, \&_signal_exec; |
1529 | $SIG_IO = AE::io $SIGPIPE_R, 0, \&_signal_exec; |
1520 | } |
1530 | } |
1521 | |
1531 | |
1522 | *signal = sub { |
1532 | *signal = $HAVE_ASYNC_INTERRUPT |
|
|
1533 | ? sub { |
1523 | my (undef, %arg) = @_; |
1534 | my (undef, %arg) = @_; |
1524 | |
1535 | |
1525 | my $signal = uc $arg{signal} |
|
|
1526 | or Carp::croak "required option 'signal' is missing"; |
|
|
1527 | |
|
|
1528 | if ($HAVE_ASYNC_INTERRUPT) { |
|
|
1529 | # async::interrupt |
1536 | # async::interrupt |
1530 | |
|
|
1531 | $signal = sig2num $signal; |
1537 | my $signal = sig2num $arg{signal}; |
1532 | $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; |
1538 | $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; |
1533 | |
1539 | |
1534 | $SIG_ASY{$signal} ||= new Async::Interrupt |
1540 | $SIG_ASY{$signal} ||= new Async::Interrupt |
1535 | cb => sub { undef $SIG_EV{$signal} }, |
1541 | cb => sub { undef $SIG_EV{$signal} }, |
1536 | signal => $signal, |
1542 | signal => $signal, |
1537 | pipe => [$SIGPIPE_R->filenos], |
1543 | pipe => [$SIGPIPE_R->filenos], |
1538 | pipe_autodrain => 0, |
1544 | pipe_autodrain => 0, |
1539 | ; |
1545 | ; |
1540 | |
1546 | |
1541 | } else { |
1547 | bless [$signal, $arg{cb}], "AnyEvent::Base::signal" |
|
|
1548 | } |
|
|
1549 | : sub { |
|
|
1550 | my (undef, %arg) = @_; |
|
|
1551 | |
1542 | # pure perl |
1552 | # pure perl |
1543 | |
|
|
1544 | # AE::Util has been loaded in signal |
|
|
1545 | $signal = sig2name $signal; |
1553 | my $signal = sig2name $arg{signal}; |
1546 | $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; |
1554 | $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; |
1547 | |
1555 | |
1548 | $SIG{$signal} ||= sub { |
1556 | $SIG{$signal} ||= sub { |
1549 | local $!; |
1557 | local $!; |
1550 | syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV; |
1558 | syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV; |
1551 | undef $SIG_EV{$signal}; |
1559 | undef $SIG_EV{$signal}; |
1552 | }; |
1560 | }; |
1553 | |
1561 | |
1554 | # can't do signal processing without introducing races in pure perl, |
1562 | # can't do signal processing without introducing races in pure perl, |
1555 | # so limit the signal latency. |
1563 | # so limit the signal latency. |
1556 | _sig_add; |
1564 | _sig_add; |
1557 | } |
|
|
1558 | |
1565 | |
1559 | bless [$signal, $arg{cb}], "AnyEvent::Base::signal" |
1566 | bless [$signal, $arg{cb}], "AnyEvent::Base::signal" |
|
|
1567 | } |
1560 | }; |
1568 | ; |
1561 | |
1569 | |
1562 | *AnyEvent::Base::signal::DESTROY = sub { |
1570 | *AnyEvent::Base::signal::DESTROY = sub { |
1563 | my ($signal, $cb) = @{$_[0]}; |
1571 | my ($signal, $cb) = @{$_[0]}; |
1564 | |
1572 | |
1565 | _sig_del; |
1573 | _sig_del; |
… | |
… | |
1572 | # print weird messages, or just unconditionally exit |
1580 | # print weird messages, or just unconditionally exit |
1573 | # instead of getting the default action. |
1581 | # instead of getting the default action. |
1574 | undef $SIG{$signal} |
1582 | undef $SIG{$signal} |
1575 | unless keys %{ $SIG_CB{$signal} }; |
1583 | unless keys %{ $SIG_CB{$signal} }; |
1576 | }; |
1584 | }; |
|
|
1585 | |
|
|
1586 | *_signal_exec = sub { |
|
|
1587 | $HAVE_ASYNC_INTERRUPT |
|
|
1588 | ? $SIGPIPE_R->drain |
|
|
1589 | : sysread $SIGPIPE_R, (my $dummy), 9; |
|
|
1590 | |
|
|
1591 | while (%SIG_EV) { |
|
|
1592 | for (keys %SIG_EV) { |
|
|
1593 | delete $SIG_EV{$_}; |
|
|
1594 | $_->() for values %{ $SIG_CB{$_} || {} }; |
|
|
1595 | } |
|
|
1596 | } |
|
|
1597 | }; |
1577 | }; |
1598 | }; |
1578 | die if $@; |
1599 | die if $@; |
|
|
1600 | |
1579 | &signal |
1601 | &signal |
1580 | } |
1602 | } |
1581 | |
1603 | |
1582 | # default implementation for ->child |
1604 | # default implementation for ->child |
1583 | |
1605 | |
1584 | our %PID_CB; |
1606 | our %PID_CB; |
1585 | our $CHLD_W; |
1607 | our $CHLD_W; |
1586 | our $CHLD_DELAY_W; |
1608 | our $CHLD_DELAY_W; |
1587 | our $WNOHANG; |
1609 | our $WNOHANG; |
1588 | |
1610 | |
|
|
1611 | # used by many Impl's |
1589 | sub _emit_childstatus($$) { |
1612 | sub _emit_childstatus($$) { |
1590 | my (undef, $rpid, $rstatus) = @_; |
1613 | my (undef, $rpid, $rstatus) = @_; |
1591 | |
1614 | |
1592 | $_->($rpid, $rstatus) |
1615 | $_->($rpid, $rstatus) |
1593 | for values %{ $PID_CB{$rpid} || {} }, |
1616 | for values %{ $PID_CB{$rpid} || {} }, |
1594 | values %{ $PID_CB{0} || {} }; |
1617 | values %{ $PID_CB{0} || {} }; |
1595 | } |
1618 | } |
1596 | |
1619 | |
1597 | sub _sigchld { |
|
|
1598 | my $pid; |
|
|
1599 | |
|
|
1600 | AnyEvent->_emit_childstatus ($pid, $?) |
|
|
1601 | while ($pid = waitpid -1, $WNOHANG) > 0; |
|
|
1602 | } |
|
|
1603 | |
|
|
1604 | sub child { |
1620 | sub child { |
|
|
1621 | eval q{ # poor man's autoloading {} |
|
|
1622 | *_sigchld = sub { |
|
|
1623 | my $pid; |
|
|
1624 | |
|
|
1625 | AnyEvent->_emit_childstatus ($pid, $?) |
|
|
1626 | while ($pid = waitpid -1, $WNOHANG) > 0; |
|
|
1627 | }; |
|
|
1628 | |
|
|
1629 | *child = sub { |
1605 | my (undef, %arg) = @_; |
1630 | my (undef, %arg) = @_; |
1606 | |
1631 | |
1607 | defined (my $pid = $arg{pid} + 0) |
1632 | defined (my $pid = $arg{pid} + 0) |
1608 | or Carp::croak "required option 'pid' is missing"; |
1633 | or Carp::croak "required option 'pid' is missing"; |
1609 | |
1634 | |
1610 | $PID_CB{$pid}{$arg{cb}} = $arg{cb}; |
1635 | $PID_CB{$pid}{$arg{cb}} = $arg{cb}; |
1611 | |
1636 | |
1612 | # WNOHANG is almost cetrainly 1 everywhere |
1637 | # WNOHANG is almost cetrainly 1 everywhere |
1613 | $WNOHANG ||= $^O =~ /^(?:openbsd|netbsd|linux|freebsd|cygwin|MSWin32)$/ |
1638 | $WNOHANG ||= $^O =~ /^(?:openbsd|netbsd|linux|freebsd|cygwin|MSWin32)$/ |
1614 | ? 1 |
1639 | ? 1 |
1615 | : eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } || 1; |
1640 | : eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } || 1; |
1616 | |
1641 | |
1617 | unless ($CHLD_W) { |
1642 | unless ($CHLD_W) { |
1618 | $CHLD_W = AE::signal CHLD => \&_sigchld; |
1643 | $CHLD_W = AE::signal CHLD => \&_sigchld; |
1619 | # child could be a zombie already, so make at least one round |
1644 | # child could be a zombie already, so make at least one round |
1620 | &_sigchld; |
1645 | &_sigchld; |
1621 | } |
1646 | } |
1622 | |
1647 | |
1623 | bless [$pid, $arg{cb}], "AnyEvent::Base::child" |
1648 | bless [$pid, $arg{cb}], "AnyEvent::Base::child" |
1624 | } |
1649 | }; |
1625 | |
1650 | |
1626 | sub AnyEvent::Base::child::DESTROY { |
1651 | *AnyEvent::Base::child::DESTROY = sub { |
1627 | my ($pid, $cb) = @{$_[0]}; |
1652 | my ($pid, $cb) = @{$_[0]}; |
1628 | |
1653 | |
1629 | delete $PID_CB{$pid}{$cb}; |
1654 | delete $PID_CB{$pid}{$cb}; |
1630 | delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} }; |
1655 | delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} }; |
1631 | |
1656 | |
1632 | undef $CHLD_W unless keys %PID_CB; |
1657 | undef $CHLD_W unless keys %PID_CB; |
|
|
1658 | }; |
|
|
1659 | }; |
|
|
1660 | die if $@; |
|
|
1661 | |
|
|
1662 | &child |
1633 | } |
1663 | } |
1634 | |
1664 | |
1635 | # idle emulation is done by simply using a timer, regardless |
1665 | # idle emulation is done by simply using a timer, regardless |
1636 | # of whether the process is idle or not, and not letting |
1666 | # of whether the process is idle or not, and not letting |
1637 | # the callback use more than 50% of the time. |
1667 | # the callback use more than 50% of the time. |
1638 | sub idle { |
1668 | sub idle { |
|
|
1669 | eval q{ # poor man's autoloading {} |
|
|
1670 | *idle = sub { |
1639 | my (undef, %arg) = @_; |
1671 | my (undef, %arg) = @_; |
1640 | |
1672 | |
1641 | my ($cb, $w, $rcb) = $arg{cb}; |
1673 | my ($cb, $w, $rcb) = $arg{cb}; |
1642 | |
1674 | |
1643 | $rcb = sub { |
1675 | $rcb = sub { |
1644 | if ($cb) { |
1676 | if ($cb) { |
1645 | $w = _time; |
1677 | $w = _time; |
1646 | &$cb; |
1678 | &$cb; |
1647 | $w = _time - $w; |
1679 | $w = _time - $w; |
1648 | |
1680 | |
1649 | # never use more then 50% of the time for the idle watcher, |
1681 | # never use more then 50% of the time for the idle watcher, |
1650 | # within some limits |
1682 | # within some limits |
1651 | $w = 0.0001 if $w < 0.0001; |
1683 | $w = 0.0001 if $w < 0.0001; |
1652 | $w = 5 if $w > 5; |
1684 | $w = 5 if $w > 5; |
1653 | |
1685 | |
1654 | $w = AE::timer $w, 0, $rcb; |
1686 | $w = AE::timer $w, 0, $rcb; |
1655 | } else { |
1687 | } else { |
1656 | # clean up... |
1688 | # clean up... |
1657 | undef $w; |
1689 | undef $w; |
1658 | undef $rcb; |
1690 | undef $rcb; |
|
|
1691 | } |
|
|
1692 | }; |
|
|
1693 | |
|
|
1694 | $w = AE::timer 0.05, 0, $rcb; |
|
|
1695 | |
|
|
1696 | bless \\$cb, "AnyEvent::Base::idle" |
1659 | } |
1697 | }; |
|
|
1698 | |
|
|
1699 | *AnyEvent::Base::idle::DESTROY = sub { |
|
|
1700 | undef $${$_[0]}; |
|
|
1701 | }; |
1660 | }; |
1702 | }; |
|
|
1703 | die if $@; |
1661 | |
1704 | |
1662 | $w = AE::timer 0.05, 0, $rcb; |
1705 | &idle |
1663 | |
|
|
1664 | bless \\$cb, "AnyEvent::Base::idle" |
|
|
1665 | } |
|
|
1666 | |
|
|
1667 | sub AnyEvent::Base::idle::DESTROY { |
|
|
1668 | undef $${$_[0]}; |
|
|
1669 | } |
1706 | } |
1670 | |
1707 | |
1671 | package AnyEvent::CondVar; |
1708 | package AnyEvent::CondVar; |
1672 | |
1709 | |
1673 | our @ISA = AnyEvent::CondVar::Base::; |
1710 | our @ISA = AnyEvent::CondVar::Base::; |
… | |
… | |
2032 | |
2069 | |
2033 | The actual code goes further and collects all errors (C<die>s, exceptions) |
2070 | The actual code goes further and collects all errors (C<die>s, exceptions) |
2034 | that occurred during request processing. The C<result> method detects |
2071 | that occurred during request processing. The C<result> method detects |
2035 | whether an exception as thrown (it is stored inside the $txn object) |
2072 | whether an exception as thrown (it is stored inside the $txn object) |
2036 | and just throws the exception, which means connection errors and other |
2073 | and just throws the exception, which means connection errors and other |
2037 | problems get reported tot he code that tries to use the result, not in a |
2074 | problems get reported to the code that tries to use the result, not in a |
2038 | random callback. |
2075 | random callback. |
2039 | |
2076 | |
2040 | All of this enables the following usage styles: |
2077 | All of this enables the following usage styles: |
2041 | |
2078 | |
2042 | 1. Blocking: |
2079 | 1. Blocking: |
… | |
… | |
2499 | automatic timer adjustments even when no monotonic clock is available, |
2536 | automatic timer adjustments even when no monotonic clock is available, |
2500 | can take avdantage of advanced kernel interfaces such as C<epoll> and |
2537 | can take avdantage of advanced kernel interfaces such as C<epoll> and |
2501 | C<kqueue>, and is the fastest backend I<by far>. You can even embed |
2538 | C<kqueue>, and is the fastest backend I<by far>. You can even embed |
2502 | L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>). |
2539 | L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>). |
2503 | |
2540 | |
|
|
2541 | If you only use backends that rely on another event loop (e.g. C<Tk>), |
|
|
2542 | then this module will do nothing for you. |
|
|
2543 | |
2504 | =item L<Guard> |
2544 | =item L<Guard> |
2505 | |
2545 | |
2506 | The guard module, when used, will be used to implement |
2546 | The guard module, when used, will be used to implement |
2507 | C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a |
2547 | C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a |
2508 | lot less memory), but otherwise doesn't affect guard operation much. It is |
2548 | lot less memory), but otherwise doesn't affect guard operation much. It is |
2509 | purely used for performance. |
2549 | purely used for performance. |
2510 | |
2550 | |
2511 | =item L<JSON> and L<JSON::XS> |
2551 | =item L<JSON> and L<JSON::XS> |
2512 | |
2552 | |
2513 | One of these modules is required when you want to read or write JSON data |
2553 | One of these modules is required when you want to read or write JSON data |
2514 | via L<AnyEvent::Handle>. It is also written in pure-perl, but can take |
2554 | via L<AnyEvent::Handle>. L<JSON> is also written in pure-perl, but can take |
2515 | advantage of the ultra-high-speed L<JSON::XS> module when it is installed. |
2555 | advantage of the ultra-high-speed L<JSON::XS> module when it is installed. |
2516 | |
|
|
2517 | In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is |
|
|
2518 | installed. |
|
|
2519 | |
2556 | |
2520 | =item L<Net::SSLeay> |
2557 | =item L<Net::SSLeay> |
2521 | |
2558 | |
2522 | Implementing TLS/SSL in Perl is certainly interesting, but not very |
2559 | Implementing TLS/SSL in Perl is certainly interesting, but not very |
2523 | worthwhile: If this module is installed, then L<AnyEvent::Handle> (with |
2560 | worthwhile: If this module is installed, then L<AnyEvent::Handle> (with |
… | |
… | |
2534 | |
2571 | |
2535 | |
2572 | |
2536 | =head1 FORK |
2573 | =head1 FORK |
2537 | |
2574 | |
2538 | Most event libraries are not fork-safe. The ones who are usually are |
2575 | Most event libraries are not fork-safe. The ones who are usually are |
2539 | because they rely on inefficient but fork-safe C<select> or C<poll> |
2576 | because they rely on inefficient but fork-safe C<select> or C<poll> calls |
2540 | calls. Only L<EV> is fully fork-aware. |
2577 | - higher performance APIs such as BSD's kqueue or the dreaded Linux epoll |
|
|
2578 | are usually badly thought-out hacks that are incompatible with fork in |
|
|
2579 | one way or another. Only L<EV> is fully fork-aware and ensures that you |
|
|
2580 | continue event-processing in both parent and child (or both, if you know |
|
|
2581 | what you are doing). |
2541 | |
2582 | |
2542 | This means that, in general, you cannot fork and do event processing |
2583 | This means that, in general, you cannot fork and do event processing in |
2543 | in the child if a watcher was created before the fork (which in turn |
2584 | the child if the event library was initialised before the fork (which |
2544 | initialises the event library). |
2585 | usually happens when the first AnyEvent watcher is created, or the library |
|
|
2586 | is loaded). |
2545 | |
2587 | |
2546 | If you have to fork, you must either do so I<before> creating your first |
2588 | If you have to fork, you must either do so I<before> creating your first |
2547 | watcher OR you must not use AnyEvent at all in the child OR you must do |
2589 | watcher OR you must not use AnyEvent at all in the child OR you must do |
2548 | something completely out of the scope of AnyEvent. |
2590 | something completely out of the scope of AnyEvent. |
2549 | |
2591 | |
2550 | The problem of doing event processing in the parent I<and> the child |
2592 | The problem of doing event processing in the parent I<and> the child |
2551 | is much more complicated: even for backends that I<are> fork-aware or |
2593 | is much more complicated: even for backends that I<are> fork-aware or |
2552 | fork-safe, their behaviour is not usually what you want: fork clones all |
2594 | fork-safe, their behaviour is not usually what you want: fork clones all |
2553 | watchers, that means all timers, I/O watchers etc. are active in both |
2595 | watchers, that means all timers, I/O watchers etc. are active in both |
2554 | parent and child, which is almost never what you want. |
2596 | parent and child, which is almost never what you want. USing C<exec> |
|
|
2597 | to start worker children from some kind of manage rprocess is usually |
|
|
2598 | preferred, because it is much easier and cleaner, at the expense of having |
|
|
2599 | to have another binary. |
2555 | |
2600 | |
2556 | |
2601 | |
2557 | =head1 SECURITY CONSIDERATIONS |
2602 | =head1 SECURITY CONSIDERATIONS |
2558 | |
2603 | |
2559 | AnyEvent can be forced to load any event model via |
2604 | AnyEvent can be forced to load any event model via |