[ViewVC] Diff of: cvs/AnyEvent/lib/AnyEvent.pm

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.287 by root, Tue Aug 25 12:05:30 2009 UTC vs.
Revision 1.303 by root, Sat Dec 5 02:52:03 2009 UTC

 might affect timers and time-outs.
 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<mod_perl>) -
+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<might> cause some events to be handled.
 =back
 =head2 SIGNAL WATCHERS
 correctly.
 Example: exit on SIGINT
    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<Async::Interrupt> 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
 callbacks to signals in a generic way, which is a pity, as you cannot
 package AnyEvent;
 # basically a tuned-down version of common::sense
 sub common_sense {
-   # no warnings
+   # from common:.sense 1.0
-   ${^WARNING_BITS} ^= ${^WARNING_BITS};
+   ${^WARNING_BITS} = "\xfc\x3f\x33\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x03";
    # use strict vars subs
    $^H |= 0x00000600;
 }
 BEGIN { AnyEvent::common_sense }
 use Carp ();
-our $VERSION = '5.112';
+our $VERSION = '5.22';
 our $MODEL;
 our $AUTOLOAD;
 our @ISA;
 our @REGISTRY;
-our $WIN32;
 our $VERBOSE;
 BEGIN {
    eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";
 package AnyEvent::Base;
 # 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;
       *_time = \&Time::HiRes::time;
       # if (eval "use POSIX (); (POSIX::times())...
 our $HAVE_ASYNC_INTERRUPT;
 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;
    $HAVE_ASYNC_INTERRUPT
 }
 our ($SIG_COUNT, $SIG_TW);
 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) {
          delete $SIG_EV{$_};
          $_->() for values %{ $SIG_CB{$_} || {} };
 As you can see, the AnyEvent + EV combination even beats the
 hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl
 backend easily beats IO::Lambda and POE.
 And even the 100% non-blocking version written using the high-level (and
-slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda by a
+slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda
-large margin, even though it does all of DNS, tcp-connect and socket I/O
+higher level ("unoptimised") abstractions by a large margin, even though
-in a non-blocking way.
+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<eg/ae0.pl> and
 F<eg/ae2.pl> 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
 AnyEvent currently installs handlers for these signals:
 it's built-in modules) are required to use it.
 That does not mean that AnyEvent won't take advantage of some additional
 modules if they are installed.
-This section epxlains which additional modules will be used, and how they
+This section explains which additional modules will be used, and how they
-affect AnyEvent's operetion.
+affect AnyEvent's operation.
 =over 4
 =item L<Async::Interrupt>
 catch the signals) with some delay (default is 10 seconds, look for
 C<$AnyEvent::MAX_SIGNAL_LATENCY>).
 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
 that have no signal handling on their own (e.g. Glib, Tk, Qt).
 lot less memory), but otherwise doesn't affect guard operation much. It is
 purely used for performance.
 =item L<JSON> and L<JSON::XS>
-This module is required when you want to read or write JSON data via
+One of these modules is required when you want to read or write JSON data
-L<AnyEvent::Handle>. It is also written in pure-perl, but can take
+via L<AnyEvent::Handle>. It is also written in pure-perl, but can take
 advantage of the ultra-high-speed L<JSON::XS> module when it is installed.
 In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is
 installed.
 Most event libraries are not fork-safe. The ones who are usually are
 because they rely on inefficient but fork-safe C<select> or C<poll>
 calls. Only L<EV> is fully fork-aware.
+This means that, in general, you cannot fork and do event processing
+in the child if a watcher was created before the fork (which in turn
+initialises the event library).
 If you have to fork, you must either do so I<before> creating your first
 watcher OR you must not use AnyEvent at all in the child OR you must do
 something completely out of the scope of AnyEvent.
+The problem of doing event processing in the parent I<and> the child
+is much more complicated: even for backends that I<are> fork-aware or
+fork-safe, their behaviour is not usually what you want: fork clones all
+watchers, that means all timers, I/O watchers etc. are active in both
+parent and child, which is almost never what you want.
 =head1 SECURITY CONSIDERATIONS
 AnyEvent can be forced to load any event model via

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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.287 by root, Tue Aug 25 12:05:30 2009 UTC vs. Revision 1.303 by root, Sat Dec 5 02:52:03 2009 UTC

Diff Legend

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.287 by root, Tue Aug 25 12:05:30 2009 UTC vs.
Revision 1.303 by root, Sat Dec 5 02:52:03 2009 UTC