[ViewVC] Diff of: cvs/EV/README

Comparing EV/README (file contents):
Revision 1.33 by root, Fri Jul 17 14:49:33 2009 UTC vs.
Revision 1.42 by root, Sat Mar 8 15:51:23 2014 UTC

           my ($w, $revents) = @_;
           warn $w->path, " has changed somehow.\n";
        };
        # MAINLOOP
-       EV::loop;           # loop until EV::unloop is called or all watchers stop
+       EV::run;                # 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::run EV::RUN_ONCE;   # block until at least one event could be handled
-       EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block
+       EV::run EV::RUN_NOWAIT; # try to handle same events, but do not block
+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 AnyEvent instead,
+    specifically the simplified API described in AE.
+    When used with EV as backend, the AE API is as fast as the native EV
+    API, but your programs/modules will still run with many other event
+    loops.
 DESCRIPTION
     This module provides an interface to libev
     (<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 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.
+  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.
   MODULE EXPORTS
     This module does not export any symbols.
 EVENT LOOPS
     EV supports multiple event loops: There is a single "default event loop"
         Must be called after a fork in the child, before entering or
         continuing the event loop. An alternative is to use
         "EV::FLAG_FORKCHECK" which calls this function automatically, at
         some performance loss (refer to the libev documentation).
-    $loop->loop_verify
+    $loop->verify
         Calls "ev_verify" to make internal consistency checks (for debugging
         libev) and abort the program if any data structures were found to be
         corrupted.
     $loop = EV::default_loop [$flags]
     $backend = EV::backend
     $backend = $loop->backend
         Returns an integer describing the backend used by libev
         (EV::BACKEND_SELECT or EV::BACKEND_EPOLL).
-    EV::loop [$flags]
+    $active = EV::run [$flags]
-    $loop->loop ([$flags])
+    $active = $loop->run ([$flags])
         Begin checking for events and calling callbacks. It returns when a
-        callback calls EV::unloop.
+        callback calls EV::unloop or the flasg are nonzero (in which case
+        the return value is true) or when there are no active watchers which
+        reference the loop (keepalive is true), in which case the return
+        value will be false. The returnv alue can generally be interpreted
+        as "if true, there is more work left to do".
         The $flags argument can be one of the following:
-           0                  as above
+           0               as above
-           EV::LOOP_ONESHOT   block at most once (wait, but do not loop)
+           EV::RUN_ONCE    block at most once (wait, but do not loop)
-           EV::LOOP_NONBLOCK  do not block at all (fetch/handle events but do not wait)
+           EV::RUN_NOWAIT  do not block at all (fetch/handle events but do not wait)
-    EV::unloop [$how]
+    EV::break [$how]
-    $loop->unloop ([$how])
+    $loop->break ([$how])
-        When called with no arguments or an argument of EV::UNLOOP_ONE,
+        When called with no arguments or an argument of EV::BREAK_ONE, makes
-        makes the innermost call to EV::loop return.
+        the innermost call to EV::loop return.
-        When called with an argument of EV::UNLOOP_ALL, all calls to
+        When called with an argument of EV::BREAK_ALL, all calls to EV::loop
-        EV::loop will return as fast as possible.
+        will return as fast as possible.
-    $count = EV::loop_count
+        When called with an argument of EV::BREAK_CANCEL, any pending break
-    $count = $loop->loop_count
+        will be cancelled.
+    $count = EV::iteration
+    $count = $loop->iteration
         Return the number of times the event loop has polled for new events.
         Sometimes useful as a generation counter.
     EV::once $fh_or_undef, $events, $timeout, $cb->($revents)
     $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents))
         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 "EV::ERROR",
-        "EV::READ", "EV::WRITE" and "EV::TIMEOUT").
+        "EV::READ", "EV::WRITE" and "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.
-    EV::feed_fd_event ($fd, $revents)
+    EV::feed_fd_event $fd, $revents
     $loop->feed_fd_event ($fd, $revents)
         Feed an event on a file descriptor into EV. EV will react to this
         call as if the readyness notifications specified by $revents (a
         combination of "EV::READ" and "EV::WRITE") happened on the file
         descriptor $fd.
-    EV::feed_signal_event ($signal)
+    EV::feed_signal_event $signal
-        Feed a signal event into EV. EV will react to this call as if the
+        Feed a signal event into the default loop. EV will react to this
-        signal specified by $signal had occured.
+        call as if the signal specified by $signal had occured.
+    EV::feed_signal $signal
+        Feed a signal event into EV - unlike "EV::feed_signal_event", this
+        works regardless of which loop has registered the signal, and is
+        mainly useful fro custom signal implementations.
     EV::set_io_collect_interval $time
     $loop->set_io_collect_interval ($time)
     EV::set_timeout_collect_interval $time
     $loop->set_timeout_collect_interval ($time)
     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
+    events (which can set both EV::READ and EV::WRITE bits).
-    (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 "_ns" in
     its name, e.g. EV::io has a non-starting variant EV::io_ns and so on.
         the watcher isn't pending it does nothing and returns 0.
     $previous_state = $w->keepalive ($bool)
         Normally, "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
+        This is convenient because it allows you to start your watchers (and
         your jobs), call "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
             to system time:
                my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" };
             That doesn't mean there will always be 3600 seconds in between
-            triggers, but only that the the clalback will be called when the
+            triggers, but only that the the callback will be called when the
             system time shows a full hour (UTC).
             Another way to think about it (for the mathematically inclined)
             is that EV::periodic will try to run the callback in this mode
             at the next possible time where "$time = $at (mod $interval)",
         Return the time that the watcher is expected to trigger next.
    SIGNAL WATCHERS - signal me when a signal gets signalled!
     $w = EV::signal $signal, $callback
     $w = EV::signal_ns $signal, $callback
+    $w = $loop->signal ($signal, $callback)
+    $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 "kill" or %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 %SIG, so watch out.
     $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):
         watchers are destroyed before this can happen (remember EV::check
         gets called first).
         The "check_ns" variant doesn't start (activate) the newly created
         watcher.
+    EV::CHECK constant issues
+        Like all other watcher types, there is a bitmask constant for use in
+        $revents and other places. The "EV::CHECK" is special as it has the
+        same name as the "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 *inlined*, i.e. runtime calls will not work. That
+        means that as long as you always "use EV" and then "EV::CHECK" you
+        are on the safe side.
    FORK WATCHERS - the audacity to resume the event loop after a fork
     Fork watchers are called when a "fork ()" was detected. The invocation
     is done before the event loop blocks next and before "check" watchers
     are being called, and only in the child after the fork.
     Please see the libev documentation for further details.
     $w = EV::async $callback
     $w = EV::async_ns $callback
+    $w = $loop->async ($callback)
+    $w = $loop->async_ns ($callback)
     $w->send
     $bool = $w->async_pending
+   CLEANUP WATCHERS - how to clean up when the event loop goes away
+    Cleanup watchers are not supported on the Perl level, they can only be
+    used via XS currently.
 PERL SIGNALS
     While Perl signal handling (%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
     On win32, there is no notion of fork so all this doesn't apply, of
     course.
 SEE ALSO
-    EV::ADNS (asynchronous DNS), Glib::EV (makes Glib/Gtk2 use EV as event
+    EV::MakeMaker - MakeMaker interface to XS API, EV::ADNS (asynchronous
-    loop), EV::Glib (embed Glib into EV), Coro::EV (efficient coroutines
+    DNS), Glib::EV (makes Glib/Gtk2 use EV as event loop), EV::Glib (embed
-    with EV), Net::SNMP::EV (asynchronous SNMP), AnyEvent for event-loop
+    Glib into EV), Coro::EV (efficient thread integration), Net::SNMP::EV
-    agnostic and portable event driven programming.
+    (asynchronous SNMP), AnyEvent for event-loop agnostic and portable event
+    driven programming.
 AUTHOR
        Marc Lehmann <schmorp@schmorp.de>
        http://home.schmorp.de/

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Comparing EV/README (file contents): Revision 1.33 by root, Fri Jul 17 14:49:33 2009 UTC vs. Revision 1.42 by root, Sat Mar 8 15:51:23 2014 UTC

Diff Legend

Comparing EV/README (file contents):
Revision 1.33 by root, Fri Jul 17 14:49:33 2009 UTC vs.
Revision 1.42 by root, Sat Mar 8 15:51:23 2014 UTC