--- AnyEvent/lib/AnyEvent.pm 2009/08/09 16:05:11 1.279 +++ AnyEvent/lib/AnyEvent.pm 2009/12/01 17:56:28 1.300 @@ -365,6 +365,13 @@ When this is the case, you can call this method, which will update the event loop's idea of "current time". +A typical example would be a script in a web server (e.g. C) - +when mod_perl executes the script, then the event loop will have the wrong +idea about the "current time" (being potentially far in the past, when the +script ran the last time). In that case you should arrange a call to C<< +AnyEvent->now_update >> each time the web server process wakes up again +(e.g. at the start of your script, or in a handler). + Note that updating the time I cause some events to be handled. =back @@ -398,6 +405,23 @@ my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 }); +=head3 Restart Behaviour + +While restart behaviour is up to the event loop implementation, most will +not restart syscalls (that includes L and AnyEvent's +pure perl implementation). + +=head3 Safe/Unsafe Signals + +Perl signals can be either "safe" (synchronous to opcode handling) or +"unsafe" (asynchronous) - the former might get delayed indefinitely, the +latter might corrupt your memory. + +AnyEvent signal handlers are, in addition, synchronous to the event loop, +i.e. they will not interrupt your running perl program but will only be +called as part of the normal event handling (just like timer, I/O etc. +callbacks, too). + =head3 Signal Races, Delays and Workarounds Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching @@ -594,7 +618,7 @@ ); # this "blocks" (while handling events) till the callback - # calls -send $result_ready->recv; Example: wait for a timer, but take advantage of the fact that condition @@ -668,9 +692,10 @@ Every call to C<< ->begin >> will increment a counter, and every call to C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end ->>, the (last) callback passed to C will be executed. That callback -is I to call C<< ->send >>, but that is not required. If no -callback was set, C will be called without any arguments. +>>, the (last) callback passed to C will be executed, passing the +condvar as first argument. That callback is I to call C<< ->send +>>, but that is not required. If no group callback was set, C will +be called without any arguments. You can think of C<< $cv->send >> giving you an OR condition (one call sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND @@ -707,7 +732,7 @@ my $cv = AnyEvent->condvar; my %result; - $cv->begin (sub { $cv->send (\%result) }); + $cv->begin (sub { shift->send (\%result) }); for my $host (@list_of_hosts) { $cv->begin; @@ -1107,8 +1132,8 @@ # basically a tuned-down version of common::sense sub common_sense { - # no warnings - ${^WARNING_BITS} ^= ${^WARNING_BITS}; + # from common:.sense 1.0 + ${^WARNING_BITS} = "\xfc\x3f\xf3\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x03"; # use strict vars subs $^H |= 0x00000600; } @@ -1117,7 +1142,7 @@ use Carp (); -our $VERSION = '5.0'; +our $VERSION = '5.21'; our $MODEL; our $AUTOLOAD; @@ -1125,8 +1150,6 @@ our @REGISTRY; -our $WIN32; - our $VERBOSE; BEGIN { @@ -1344,7 +1367,7 @@ # default implementations for many methods -sub _time { +sub _time() { # probe for availability of Time::HiRes if (eval "use Time::HiRes (); Time::HiRes::time (); 1") { warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8; @@ -1374,7 +1397,7 @@ sub _have_async_interrupt() { $HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT} - && eval "use Async::Interrupt 1.0 (); 1") + && eval "use Async::Interrupt 1.02 (); 1") unless defined $HAVE_ASYNC_INTERRUPT; $HAVE_ASYNC_INTERRUPT @@ -1387,7 +1410,7 @@ sub _signal_exec { $HAVE_ASYNC_INTERRUPT ? $SIGPIPE_R->drain - : sysread $SIGPIPE_R, my $dummy, 9; + : sysread $SIGPIPE_R, (my $dummy), 9; while (%SIG_EV) { for (keys %SIG_EV) { @@ -1913,16 +1936,9 @@ }, ); - my $time_watcher; # can only be used once - - sub new_timer { - $timer = AnyEvent->timer (after => 1, cb => sub { - warn "timeout\n"; # print 'timeout' about every second - &new_timer; # and restart the time - }); - } - - new_timer; # create first timer + my $time_watcher = AnyEvent->timer (after => 1, interval => 1, cb => sub { + warn "timeout\n"; # print 'timeout' at most every second + }); $cv->recv; # wait until user enters /^q/i @@ -2376,13 +2392,13 @@ backend easily beats IO::Lambda and POE. And even the 100% non-blocking version written using the high-level (and -slow :) L abstraction beats both POE and IO::Lambda by a -large margin, even though it does all of DNS, tcp-connect and socket I/O -in a non-blocking way. +slow :) L abstraction beats both POE and IO::Lambda +higher level ("unoptimised") abstractions by a large margin, even though +it does all of DNS, tcp-connect and socket I/O in a non-blocking way. The two AnyEvent benchmarks programs can be found as F and F in the AnyEvent distribution, the remaining benchmarks are -part of the IO::lambda distribution and were used without any changes. +part of the IO::Lambda distribution and were used without any changes. =head1 SIGNALS @@ -2435,7 +2451,7 @@ modules if they are installed. This section epxlains which additional modules will be used, and how they -affect AnyEvent's operetion. +affect AnyEvent's operation. =over 4 @@ -2450,7 +2466,7 @@ If this module is available, then it will be used to implement signal catching, which means that signals will not be delayed, and the event loop -will not be interrupted regularly, which is more efficient (And good for +will not be interrupted regularly, which is more efficient (and good for battery life on laptops). This affects not just the pure-perl event loop, but also other event loops @@ -2481,8 +2497,8 @@ =item L and L -This module is required when you want to read or write JSON data via -L. It is also written in pure-perl, but can take +One of these modules is required when you want to read or write JSON data +via L. It is also written in pure-perl, but can take advantage of the ultra-high-speed L module when it is installed. In fact, L will use L by default if it is