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

Comparing EV/EV.pm (file contents):
Revision 1.115 by root, Tue Apr 28 00:50:56 2009 UTC vs.
Revision 1.129 by root, Thu Oct 21 15:13:42 2010 UTC

    # MAINLOOP
    EV::loop;           # loop until EV::unloop is called or all watchers stop
    EV::loop EV::LOOP_ONESHOT;  # block until at least one event could be handled
    EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block
+=head1 BEFORE YOU START USING THIS MODULE
+If you only need timer, I/O, signal, child and idle watchers and not the
+advanced functionality of this module, consider using L<AnyEvent> instead,
+specifically the simplified API described in L<AE>.
+When used with EV as backend, the L<AE> API is as fast as the native L<EV>
+API, but your programs/modules will still run with many other event loops.
 =head1 DESCRIPTION
 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
 can use it through the L<AnyEvent> module, stay portable to other event
 loops (if you don't rely on any watcher types not available through it)
 and still be faster than with any other event loop currently supported in
 Perl.
+=head2 PORTING FROM EV 3.X to 4.X
+EV version 4 introduces a number of incompatible changes summarised
+here. According to the depreciation strategy used by libev, there is a
+compatibility layer in place so programs should continue to run unchanged
+(the XS interface lacks this layer, so programs using that one need to be
+updated).
+This compatibility layer will be switched off in some future release.
+All changes relevant to Perl are renames of symbols, functions and
+methods:
+  EV::loop          => EV::run
+  EV::LOOP_NONBLOCK => EV::RUN_NOWAIT
+  EV::LOOP_ONESHOT  => EV::RUN_ONCE
+  EV::unloop        => EV::break
+  EV::UNLOOP_CANCEL => EV::BREAK_CANCEL
+  EV::UNLOOP_ONE    => EV::BREAK_ONE
+  EV::UNLOOP_ALL    => EV::BREAK_ALL
+  EV::TIMEOUT       => EV::TIMER
+  EV::loop_count    => EV::iteration
+  EV::loop_depth    => EV::depth
+  EV::loop_verify   => EV::verify
+The loop object methods corresponding to the functions above have been
+similarly renamed.
 =head2 MODULE EXPORTS
 This module does not export any symbols.
 =cut
 package EV;
-no warnings;
+use common::sense;
-use strict;
 BEGIN {
-   our $VERSION = '3.6';
+   our $VERSION = '4.00';
    use XSLoader;
    XSLoader::load "EV", $VERSION;
 }
 @EV::IO::ISA       =
 timeout. Otherwise a EV::timer with this value will be started.
 When an error occurs or either the timeout or I/O watcher triggers, then
 the callback will be called with the received event set (in general
 you can expect it to be a combination of C<EV::ERROR>, C<EV::READ>,
-C<EV::WRITE> and C<EV::TIMEOUT>).
+C<EV::WRITE> and C<EV::TIMER>).
 EV::once doesn't return anything: the watchers stay active till either
 of them triggers, then they will be stopped and freed, and the callback
 invoked.
 These advanced functions set the minimum block interval when polling for I/O events and the minimum
 wait interval for timer events. See the libev documentation at
 L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONTROLLING_THE_EVENT_LOOP>
 (locally installed as F<EV::libev>) for a more detailed discussion.
+=item $count = EV::pending_count
+=item $count = $loop->pending_count
+Returns the number of currently pending watchers.
+=item EV::invoke_pending
+=item $loop->invoke_pending
+Invoke all currently pending watchers.
 =back
 =head1 WATCHER OBJECTS
 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 I/O events
-(which can set both EV::READ and EV::WRITE bits), and EV::timer (which
+(which can set both EV::READ and EV::WRITE bits).
-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
 its name, e.g. EV::io has a non-starting variant EV::io_ns and so on.
 =item $previous_state = $w->keepalive ($bool)
 Normally, C<EV::loop> will return when there are no active watchers
 (which is a "deadlock" because no progress can be made anymore). This is
-convinient because it allows you to start your watchers (and your jobs),
+convenient because it allows you to start your watchers (and your jobs),
 call C<EV::loop> once and when it returns you know that all your jobs are
 finished (or they forgot to register some watchers for their task :).
 Sometimes, however, this gets in your way, for example when the module
 that calls C<EV::loop> (usually the main program) is not the same module
 =item $w = EV::signal $signal, $callback
 =item $w = EV::signal_ns $signal, $callback
+=item $w = $loop->signal ($signal, $callback)
+=item $w = $loop->signal_ns ($signal, $callback)
 Call the callback when $signal is received (the signal can be specified by
 number or by name, just as with C<kill> or C<%SIG>).
+Only one event loop can grab a given signal - attempting to grab the same
+signal from two EV loops will crash the program immediately or cause data
+corruption.
 EV will grab the signal for the process (the kernel only allows one
 component to receive a signal at a time) when you start a signal watcher,
 and removes it again when you stop it. Perl does the same when you
 add/remove callbacks to C<%SIG>, so watch out.
 =item $w = $loop->check_ns ($callback)
 Call the callback just after the process wakes up again (after it has
 gathered events), but before any other callbacks have been invoked.
-This is used to integrate other event-based software into the EV
+This can be used to integrate other event-based software into the EV
 mainloop: You register a prepare callback and in there, you create io and
 timer watchers as required by the other software. Here is a real-world
 example of integrating Net::SNMP (with some details left out):
    our @snmp_watcher;
 The callbacks of the created watchers will not be called as the watchers
 are destroyed before this can happen (remember EV::check gets called
 first).
 The C<check_ns> variant doesn't start (activate) the newly created watcher.
+=item EV::CHECK constant issues
+Like all other watcher types, there is a bitmask constant for use in
+C<$revents> and other places. The C<EV::CHECK> is special as it has
+the same name as the C<CHECK> sub called by Perl. This doesn't cause
+big issues on newer perls (beginning with 5.8.9), but it means thatthe
+constant must be I<inlined>, i.e. runtime calls will not work. That means
+that as long as you always C<use EV> and then C<EV::CHECK> you are on the
+safe side.
 =back
 =head3 FORK WATCHERS - the audacity to resume the event loop after a fork
 =back
 =head3 ASYNC WATCHERS - how to wake up another event loop
-Async watchers are provided by EV, but have little use in perl directly, as perl
+Async watchers are provided by EV, but have little use in perl directly,
-neither supports threads nor direct access to signal handlers or other
+as perl neither supports threads running in parallel nor direct access to
-contexts where they could be of value.
+signal handlers or other contexts where they could be of value.
 It is, however, possible to use them from the XS level.
 Please see the libev documentation for further details.
    my $async_check = EV::check sub { };
 This ensures that perl gets into control for a short time to handle any
 pending signals, and also ensures (slightly) slower overall operation.
-=head1 THREADS
+=head1 ITHREADS
-Threads are not supported by this module in any way. Perl pseudo-threads
+Ithreads 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
+is evil stuff and must die. Real threads as provided by Coro are fully
-on thread support for it.
+supported (and enhanced support is available via L<Coro::EV>).
 =head1 FORK
 Most of the "improved" event delivering mechanisms of modern operating
 systems have quite a few problems with fork(2) (to put it bluntly: it is

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Comparing EV/EV.pm (file contents): Revision 1.115 by root, Tue Apr 28 00:50:56 2009 UTC vs. Revision 1.129 by root, Thu Oct 21 15:13:42 2010 UTC

Diff Legend

Comparing EV/EV.pm (file contents):
Revision 1.115 by root, Tue Apr 28 00:50:56 2009 UTC vs.
Revision 1.129 by root, Thu Oct 21 15:13:42 2010 UTC