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

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.147 by root, Fri May 30 21:43:26 2008 UTC vs.
Revision 1.166 by root, Tue Jul 8 23:10:20 2008 UTC

-=head1 => NAME
+=head1 NAME
 AnyEvent - provide framework for multiple event loops
 EV, Event, Glib, Tk, Perl, Event::Lib, Qt, POE - various supported event loops
    });
    my $w = AnyEvent->condvar; # stores whether a condition was flagged
    $w->send; # wake up current and all future recv's
    $w->recv; # enters "main loop" till $condvar gets ->send
+=head1 INTRODUCTION/TUTORIAL
+This manpage is mainly a reference manual. If you are interested
+in a tutorial or some gentle introduction, have a look at the
+L<AnyEvent::Intro> manpage.
 =head1 WHY YOU SHOULD USE THIS MODULE (OR NOT)
 Glib, POE, IO::Async, Event... CPAN offers event models by the dozen
 nowadays. So what is different about AnyEvent?
 Many watchers either are used with "recursion" (repeating timers for
 example), or need to refer to their watcher object in other ways.
 An any way to achieve that is this pattern:
-  my $w; $w = AnyEvent->type (arg => value ..., cb => sub {
+   my $w; $w = AnyEvent->type (arg => value ..., cb => sub {
-     # you can use $w here, for example to undef it
+      # you can use $w here, for example to undef it
-     undef $w;
+      undef $w;
-  });
+   });
 Note that C<my $w; $w => combination. This is necessary because in Perl,
 my variables are only visible after the statement in which they are
 declared.
 =head2 I/O WATCHERS
 You can create an I/O watcher by calling the C<< AnyEvent->io >> method
 with the following mandatory key-value pairs as arguments:
-C<fh> the Perl I<file handle> (I<not> file descriptor) to watch
+C<fh> the Perl I<file handle> (I<not> file descriptor) to watch for events
-for events. C<poll> must be a string that is either C<r> or C<w>,
+(AnyEvent might or might not keep a reference to this file handle). C<poll>
-which creates a watcher waiting for "r"eadable or "w"ritable events,
+must be a string that is either C<r> or C<w>, which creates a watcher
-respectively. C<cb> is the callback to invoke each time the file handle
+waiting for "r"eadable or "w"ritable events, respectively. C<cb> is the
-becomes ready.
+callback to invoke each time the file handle becomes ready.
 Although the callback might get passed parameters, their value and
 presence is undefined and you cannot rely on them. Portable AnyEvent
 callbacks cannot use arguments passed to I/O watcher callbacks.
 Some event loops issue spurious readyness notifications, so you should
 always use non-blocking calls when reading/writing from/to your file
 handles.
-Example:
-   # wait for readability of STDIN, then read a line and disable the watcher
+Example: wait for readability of STDIN, then read a line and disable the
+watcher.
    my $w; $w = AnyEvent->io (fh => \*STDIN, poll => 'r', cb => sub {
       chomp (my $input = <STDIN>);
       warn "read: $input\n";
       undef $w;
    });
 Although the callback might get passed parameters, their value and
 presence is undefined and you cannot rely on them. Portable AnyEvent
 callbacks cannot use arguments passed to time watcher callbacks.
-The timer callback will be invoked at most once: if you want a repeating
+The callback will normally be invoked once only. If you specify another
-timer you have to create a new watcher (this is a limitation by both Tk
+parameter, C<interval>, as a strictly positive number (> 0), then the
-and Glib).
+callback will be invoked regularly at that interval (in fractional
+seconds) after the first invocation. If C<interval> is specified with a
+false value, then it is treated as if it were missing.
-Example:
+The callback will be rescheduled before invoking the callback, but no
+attempt is done to avoid timer drift in most backends, so the interval is
+only approximate.
-   # fire an event after 7.7 seconds
+Example: fire an event after 7.7 seconds.
    my $w = AnyEvent->timer (after => 7.7, cb => sub {
       warn "timeout\n";
    });
    # to cancel the timer:
    undef $w;
-Example 2:
-   # fire an event after 0.5 seconds, then roughly every second
+Example 2: fire an event after 0.5 seconds, then roughly every second.
-   my $w;
-   my $cb = sub {
-      # cancel the old timer while creating a new one
-      $w = AnyEvent->timer (after => 1, cb => $cb);
+   my $w = AnyEvent->timer (after => 0.5, interval => 1, cb => sub {
+      warn "timeout\n";
    };
-   # start the "loop" by creating the first watcher
-   $w = AnyEvent->timer (after => 0.5, cb => $cb);
 =head3 TIMING ISSUES
 There are two ways to handle timers: based on real time (relative, "fire
 in 10 seconds") and based on wallclock time (absolute, "fire at 12
 AnyEvent program, you I<have> to create at least one watcher before you
 C<fork> the child (alternatively, you can call C<AnyEvent::detect>).
 Example: fork a process and wait for it
-  my $done = AnyEvent->condvar;
+   my $done = AnyEvent->condvar;
-  my $pid = fork or exit 5;
+   my $pid = fork or exit 5;
-  my $w = AnyEvent->child (
+   my $w = AnyEvent->child (
-     pid => $pid,
+      pid => $pid,
-     cb  => sub {
+      cb  => sub {
-        my ($pid, $status) = @_;
+         my ($pid, $status) = @_;
-        warn "pid $pid exited with status $status";
+         warn "pid $pid exited with status $status";
-        $done->send;
+         $done->send;
-     },
+      },
-  );
+   );
-  # do something else, then wait for process exit
+   # do something else, then wait for process exit
-  $done->recv;
+   $done->recv;
 =head2 CONDITION VARIABLES
 If you are familiar with some event loops you will know that all of them
 require you to run some blocking "loop", "run" or similar function that
 This is a mutator function that returns the callback set and optionally
 replaces it before doing so.
 The callback will be called when the condition becomes "true", i.e. when
-C<send> or C<croak> are called. Calling C<recv> inside the callback
+C<send> or C<croak> are called, with the only argument being the condition
-or at any later time is guaranteed not to block.
+variable itself. Calling C<recv> inside the callback or at any later time
+is guaranteed not to block.
 =back
 =head1 GLOBAL VARIABLES AND FUNCTIONS
 =item L<AnyEvent::Util>
 Contains various utility functions that replace often-used but blocking
 functions such as C<inet_aton> by event-/callback-based versions.
-=item L<AnyEvent::Handle>
-Provide read and write buffers and manages watchers for reads and writes.
 =item L<AnyEvent::Socket>
 Provides various utility functions for (internet protocol) sockets,
 addresses and name resolution. Also functions to create non-blocking tcp
 connections or tcp servers, with IPv6 and SRV record support and more.
+=item L<AnyEvent::Handle>
+Provide read and write buffers, manages watchers for reads and writes,
+supports raw and formatted I/O, I/O queued and fully transparent and
+non-blocking SSL/TLS.
 =item L<AnyEvent::DNS>
 Provides rich asynchronous DNS resolver capabilities.
+=item L<AnyEvent::HTTP>
+A simple-to-use HTTP library that is capable of making a lot of concurrent
+HTTP requests.
 =item L<AnyEvent::HTTPD>
 Provides a simple web application server framework.
 =item L<AnyEvent::FastPing>
 The fastest ping in the west.
+=item L<AnyEvent::DBI>
+Executes L<DBI> requests asynchronously in a proxy process.
+=item L<AnyEvent::AIO>
+Truly asynchronous I/O, should be in the toolbox of every event
+programmer. AnyEvent::AIO transparently fuses L<IO::AIO> and AnyEvent
+together.
+=item L<AnyEvent::BDB>
+Truly asynchronous Berkeley DB access. AnyEvent::BDB transparently fuses
+L<BDB> and AnyEvent together.
+=item L<AnyEvent::GPSD>
+A non-blocking interface to gpsd, a daemon delivering GPS information.
+=item L<AnyEvent::IGS>
+A non-blocking interface to the Internet Go Server protocol (used by
+L<App::IGS>).
 =item L<Net::IRC3>
 AnyEvent based IRC client module family.
 =item L<Coro>
 Has special support for AnyEvent via L<Coro::AnyEvent>.
-=item L<AnyEvent::AIO>, L<IO::AIO>
-Truly asynchronous I/O, should be in the toolbox of every event
-programmer. AnyEvent::AIO transparently fuses IO::AIO and AnyEvent
-together.
-=item L<AnyEvent::BDB>, L<BDB>
-Truly asynchronous Berkeley DB access. AnyEvent::AIO transparently fuses
-IO::AIO and AnyEvent together.
 =item L<IO::Lambda>
 The lambda approach to I/O - don't ask, look there. Can use AnyEvent.
 =back
 no warnings;
 use strict;
 use Carp;
-our $VERSION = 4.11;
+our $VERSION = 4.2;
 our $MODEL;
 our $AUTOLOAD;
 our @ISA;
 sub AnyEvent::Base::Signal::DESTROY {
    my ($signal, $cb) = @{$_[0]};
    delete $SIG_CB{$signal}{$cb};
-   $SIG{$signal} = 'DEFAULT' unless keys %{ $SIG_CB{$signal} };
+   delete $SIG{$signal} unless keys %{ $SIG_CB{$signal} };
 }
 # default implementation for ->child
 our %PID_CB;
 This functionality might change in future versions.
 For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you
 could start your program like this:
-  PERL_ANYEVENT_MODEL=Perl perl ...
+   PERL_ANYEVENT_MODEL=Perl perl ...
 =item C<PERL_ANYEVENT_PROTOCOLS>
 Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences
 for IPv4 or IPv6. The default is unspecified (and might change, or be the result
 specified in the variable.
 You can make AnyEvent completely ignore this variable by deleting it
 before the first watcher gets created, e.g. with a C<BEGIN> block:
-  BEGIN { delete $ENV{PERL_ANYEVENT_MODEL} }
+   BEGIN { delete $ENV{PERL_ANYEVENT_MODEL} }
-  use AnyEvent;
+   use AnyEvent;
 Similar considerations apply to $ENV{PERL_ANYEVENT_VERBOSE}, as that can
 be used to probe what backend is used and gain other information (which is
 probably even less useful to an attacker than PERL_ANYEVENT_MODEL).
+=head1 BUGS
+Perl 5.8 has numerous memleaks that sometimes hit this module and are hard
+to work around. If you suffer from memleaks, first upgrade to Perl 5.10
+and check wether the leaks still show up. (Perl 5.10.0 has other annoying
+mamleaks, such as leaking on C<map> and C<grep> but it is usually not as
+pronounced).
 =head1 SEE ALSO
 Utility functions: L<AnyEvent::Util>.
 Nontrivial usage examples: L<Net::FCP>, L<Net::XMPP2>, L<AnyEvent::DNS>.
 =head1 AUTHOR
- Marc Lehmann <schmorp@schmorp.de>
+   Marc Lehmann <schmorp@schmorp.de>
- http://home.schmorp.de/
+   http://home.schmorp.de/
 =cut
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Comparing AnyEvent/lib/AnyEvent.pm (file contents): Revision 1.147 by root, Fri May 30 21:43:26 2008 UTC vs. Revision 1.166 by root, Tue Jul 8 23:10:20 2008 UTC

Diff Legend

Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.147 by root, Fri May 30 21:43:26 2008 UTC vs.
Revision 1.166 by root, Tue Jul 8 23:10:20 2008 UTC