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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.298 by root, Tue Nov 24 05:48:06 2009 UTC vs.
Revision 1.311 by root, Wed Feb 10 13:33:44 2010 UTC

 =head2 IDLE WATCHERS
    $w = AnyEvent->idle (cb => <callback>);
-Sometimes there is a need to do something, but it is not so important
+Repeatedly invoke the callback after the process becomes idle, until
-to do it instantly, but only when there is nothing better to do. This
+either the watcher is destroyed or new events have been detected.
-"nothing better to do" is usually defined to be "no other events need
-attention by the event loop".
-Idle watchers ideally get invoked when the event loop has nothing
+Idle watchers are useful when there is a need to do something, but it
-better to do, just before it would block the process to wait for new
+is not so important (or wise) to do it instantly. The callback will be
-events. Instead of blocking, the idle watcher is invoked.
+invoked only when there is "nothing better to do", which is usually
+defined as "all outstanding events have been handled and no new events
+have been detected". That means that idle watchers ideally get invoked
+when the event loop has just polled for new events but none have been
+detected. Instead of blocking to wait for more events, the idle watchers
+will be invoked.
-Most event loops unfortunately do not really support idle watchers (only
+Unfortunately, most event loops do not really support idle watchers (only
 EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent
 will simply call the callback "from time to time".
 Example: read lines from STDIN, but only process them when the
 program is otherwise idle:
 You should check C<$AnyEvent::MODEL> before adding to this array, though:
 if it is defined then the event loop has already been detected, and the
 array will be ignored.
 Best use C<AnyEvent::post_detect { BLOCK }> when your application allows
-it,as it takes care of these details.
+it, as it takes care of these details.
 This variable is mainly useful for modules that can do something useful
 when AnyEvent is used and thus want to know when it is initialised, but do
 not need to even load it by default. This array provides the means to hook
 into AnyEvent passively, without loading it.
+Example: To load Coro::AnyEvent whenever Coro and AnyEvent are used
+together, you could put this into Coro (this is the actual code used by
+Coro to accomplish this):
+   if (defined $AnyEvent::MODEL) {
+      # AnyEvent already initialised, so load Coro::AnyEvent
+      require Coro::AnyEvent;
+   } else {
+      # AnyEvent not yet initialised, so make sure to load Coro::AnyEvent
+      # as soon as it is
+      push @AnyEvent::post_detect, sub { require Coro::AnyEvent };
+   }
 =back
 =head1 WHAT TO DO IN A MODULE
 package AnyEvent;
 # basically a tuned-down version of common::sense
 sub common_sense {
    # from common:.sense 1.0
-   ${^WARNING_BITS} = "\xfc\x3f\xf3\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x03";
+   ${^WARNING_BITS} = "\xfc\x3f\x33\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x00";
-   # use strict vars subs
+   # use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl)
    $^H |= 0x00000600;
 }
 BEGIN { AnyEvent::common_sense }
 use Carp ();
-our $VERSION = '5.21';
+our $VERSION = '5.24';
 our $MODEL;
 our $AUTOLOAD;
 our @ISA;
 our @REGISTRY;
 our $VERBOSE;
 BEGIN {
+   eval "sub CYGWIN(){" . (($^O =~ /cygwin/i) *1) . "}";
-   eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }";
+   eval "sub WIN32 (){" . (($^O =~ /mswin32/i)*1) . "}";
-   eval "sub TAINT(){ " . (${^TAINT}*1) . " }";
+   eval "sub TAINT (){" . (${^TAINT}          *1) . "}";
    delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV}
       if ${^TAINT};
    $VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*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())...
    } else {
       warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE;
-      *_time = sub { time }; # epic fail
+      *_time = sub (){ time }; # epic fail
    }
    &_time
 }
 it's built-in modules) are required to use it.
 That does not mean that AnyEvent won't take advantage of some additional
 modules if they are installed.
-This section epxlains which additional modules will be used, and how they
+This section explains which additional modules will be used, and how they
-affect AnyEvent's operetion.
+affect AnyEvent's operation.
 =over 4
 =item L<Async::Interrupt>
 catch the signals) with some delay (default is 10 seconds, look for
 C<$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).
 =head1 FORK
 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>
+because they rely on inefficient but fork-safe C<select> or C<poll> calls
-calls. Only L<EV> is fully fork-aware.
+- higher performance APIs such as BSD's kqueue or the dreaded Linux epoll
+are usually badly thought-out hacks that are incompatible with fork in
+one way or another. Only L<EV> is fully fork-aware and ensures that you
+continue event-processing in both parent and child (or both, if you know
+what you are doing).
+This means that, in general, you cannot fork and do event processing in
+the child if the event library was initialised before the fork (which
+usually happens when the first AnyEvent watcher is created, or the library
+is loaded).
 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. USing C<exec>
+to start worker children from some kind of manage rprocess is usually
+preferred, because it is much easier and cleaner, at the expense of having
+to have another binary.
 =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 1.298 by root, Tue Nov 24 05:48:06 2009 UTC vs. Revision 1.311 by root, Wed Feb 10 13:33:44 2010 UTC

Diff Legend

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.298 by root, Tue Nov 24 05:48:06 2009 UTC vs.
Revision 1.311 by root, Wed Feb 10 13:33:44 2010 UTC