[ViewVC] Diff of: cvs/EV/EV.pm

Comparing EV/EV.pm (file contents):
Revision 1.57 by root, Wed Nov 28 17:32:24 2007 UTC vs.
Revision 1.63 by root, Fri Dec 7 18:11:21 2007 UTC

 This module provides an interface to libev
 (L<http://software.schmorp.de/pkg/libev.html>). While the documentation
 below is comprehensive, one might also consult the documentation of libev
 itself (L<http://cvs.schmorp.de/libev/ev.html>) for more subtle details on
 watcher semantics or some discussion on the available backends, or how to
-force a specific backend with C<LIBEV_FLAGS>.
+force a specific backend with C<LIBEV_FLAGS>, or just about in any case
+because it has much more detailed information.
 =cut
 package EV;
 use strict;
 BEGIN {
-   our $VERSION = '1.4';
+   our $VERSION = '1.71';
    use XSLoader;
    XSLoader::load "EV", $VERSION;
 }
 @EV::IO::ISA       =
 innermost call to EV::loop return.
 When called with an argument of EV::UNLOOP_ALL, all calls to EV::loop will return as
 fast as possible.
+=item $count = EV::loop_count
+Return the number of times the event loop has polled for new
+events. Sometiems useful as a generation counter.
 =item EV::once $fh_or_undef, $events, $timeout, $cb->($revents)
 This function rolls together an I/O and a timer watcher for a single
 one-shot event without the need for managing a watcher object.
 events.
 Each watcher type has its associated bit in revents, so you can use the
 same callback for multiple watchers. The event mask is named after the
 type, i..e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE,
-EV::periodic sets EV::PERIODIC and so on, with the exception of IO events
+EV::periodic sets EV::PERIODIC and so on, with the exception of I/O events
 (which can set both EV::READ and EV::WRITE bits), and EV::timer (which
 uses EV::TIMEOUT).
 In the rare case where one wants to create a watcher but not start it at
 the same time, each constructor has a variant with a trailing C<_ns> in
 =item $w->stop
 Stop a watcher if it is active. Also clear any pending events (events that
 have been received but that didn't yet result in a callback invocation),
-regardless of wether the watcher was active or not.
+regardless of whether the watcher was active or not.
 =item $bool = $w->is_active
 Returns true if the watcher is active, false otherwise.
 though your watcher is active, it won't keep C<EV::loop> from returning.
 The initial value for keepalive is true (enabled), and you cna change it
 any time.
-Example: Register an IO watcher for some UDP socket but do not keep the
+Example: Register an I/O watcher for some UDP socket but do not keep the
 event loop from running just because of that watcher.
    my $udp_socket = ...
    my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... };
    $udp_watcher->keepalive (0);
 =head2 WATCHER TYPES
 Each of the following subsections describes a single watcher type.
-=head3 IO WATCHERS - is this file descriptor readable or writable?
+=head3 I/O WATCHERS - is this file descriptor readable or writable?
 =over 4
 =item $w = EV::io $fileno_or_fh, $eventmask, $callback
 =item $w = EV::idle $callback
 =item $w = EV::idle_ns $callback
-Call the callback when there are no pending io, timer/periodic, signal or
+Call the callback when there are no other pending watchers of the same or
-child events, i.e. when the process is idle.
+higher priority (excluding check, prepare and other idle watchers of the
+same or lower priority, of course). They are called idle watchers because
+when the watcher is the highest priority pending event in the process, the
+process is considered to be idle at that priority.
+If you want a watcher that is only ever called when I<no> other events are
+outstanding you have to set the priority to C<EV::MINPRI>.
 The process will not block as long as any idle watchers are active, and
 they will be called repeatedly until stopped.
+For example, if you have idle watchers at priority C<0> and C<1>, and
+an I/O watcher at priority C<0>, then the idle watcher at priority C<1>
+and the I/O watcher will always run when ready. Only when the idle watcher
+at priority C<1> is stopped and the I/O watcher at priority C<0> is not
+pending with the C<0>-priority idle watcher be invoked.
 The C<idle_ns> variant doesn't start (activate) the newly created watcher.
 =back
          or return;
       # make the dispatcher handle any outstanding stuff
       ... not shown
-      # create an IO watcher for each and every socket
+      # create an I/O watcher for each and every socket
       @snmp_watcher = (
          (map { EV::io $_, EV::READ, sub { } }
              keys %{ $dispatcher->{_descriptors} }),
          EV::timer +($event->[Net::SNMP::Dispatcher::_ACTIVE]
 The C<fork_ns> variant doesn't start (activate) the newly created watcher.
 =back
+=head1 PERL SIGNALS
+While Perl signal handling (C<%SIG>) is not affected by EV, the behaviour
+with EV is as the same as any other C library: Perl-signals will only be
+handled when Perl runs, which means your signal handler might be invoked
+only the next time an event callback is invoked.
+The solution is to use EV signal watchers (see C<EV::signal>), which will
+ensure proper operations with regards to other event watchers.
+If you cannot do this for whatever reason, you can also force a watcher
+to be called on every event loop iteration by installing a C<EV::check>
+watcher:
+   my $async_check = EV::check sub { };
+This ensures that perl shortly gets into control for a short time, and
+also ensures slower overall operation.
 =head1 THREADS
 Threads are not supported by this module in any way. Perl pseudo-threads
 is evil stuff and must die. As soon as Perl gains real threads I will work
 1;
 =head1 SEE ALSO
-L<EV::DNS>.
+L<EV::ADNS> (asynchronous dns), L<Glib::EV> (makes Glib/Gtk2 use EV as
+event loop), L<Coro::EV> (efficient coroutines with EV).
 =head1 AUTHOR
  Marc Lehmann <schmorp@schmorp.de>
  http://home.schmorp.de/

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Comparing EV/EV.pm (file contents): Revision 1.57 by root, Wed Nov 28 17:32:24 2007 UTC vs. Revision 1.63 by root, Fri Dec 7 18:11:21 2007 UTC

Diff Legend

Comparing EV/EV.pm (file contents):
Revision 1.57 by root, Wed Nov 28 17:32:24 2007 UTC vs.
Revision 1.63 by root, Fri Dec 7 18:11:21 2007 UTC