coro::util(3pm) [debian man page]

Util(3pm)						User Contributed Perl Documentation						 Util(3pm)

NAME

       Coro::Util - various utility functions.

SYNOPSIS

	use Coro::Util;

DESCRIPTION

       This module implements various utility functions, mostly replacing perl functions by non-blocking counterparts.

       Many of these functions exist for the sole purpose of emulating existing interfaces, no matter how bad or limited they are (e.g. no IPv6
       support).

       This module is an AnyEvent user. Refer to the AnyEvent documentation to see how to integrate it into your own programs.

       $ipn = Coro::Util::inet_aton $hostname || $ip
	   Works almost exactly like its "Socket::inet_aton" counterpart, except that it does not block other coroutines.

	   Does not handle multihomed hosts or IPv6 - consider using "AnyEvent::Socket::resolve_sockaddr" with the Coro rouse functions instead.

       gethostbyname, gethostbyaddr
	   Work similarly to their Perl counterparts, but do not block. Uses "AnyEvent::Util::inet_aton" internally.

	   Does not handle multihomed hosts or IPv6 - consider using "AnyEvent::Socket::resolve_sockaddr" or "AnyEvent::DNS::reverse_lookup" with
	   the Coro rouse functions instead.

       @result = Coro::Util::fork_eval { ... }, @args
	   Executes the given code block or code reference with the given arguments in a separate process, returning the results. The return
	   values must be serialisable with Coro::Storable. It may, of course, block.

	   Note that using event handling in the sub is not usually a good idea as you will inherit a mixed set of watchers from the parent.

	   Exceptions will be correctly forwarded to the caller.

	   This function is useful for pushing cpu-intensive computations into a different process, for example to take advantage of multiple
	   CPU's. Its also useful if you want to simply run some blocking functions (such as "system()") and do not care about the overhead enough
	   to code your own pid watcher etc.

	   This function might keep a pool of processes in some future version, as fork can be rather slow in large processes.

	   You should also look at "AnyEvent::Util::fork_eval", which is newer and more compatible to totally broken Perl implementations such as
	   the one from ActiveState.

	   Example: execute some external program (convert image to rgba raw form) and add a long computation (extract the alpha channel) in a
	   separate process, making sure that never more then $NUMCPUS processes are being run.

	      my $cpulock = new Coro::Semaphore $NUMCPUS;

	      sub do_it {
		 my ($path) = @_;

		 my $guard = $cpulock->guard;

		 Coro::Util::fork_eval {
		    open my $fh, "convert -depth 8 Q$pathE rgba:"
		       or die "$path: $!";

		    local $/;
		    # make my eyes hurt
		    pack "C*", unpack "(xxxC)*", <$fh>
		 }
	      }

	      my $alphachannel = do_it "/tmp/img.png";

AUTHOR

	Marc Lehmann <schmorp@schmorp.de>
	http://home.schmorp.de/

perl v5.14.2							    2012-04-13								 Util(3pm)

Check Out this Related Man Page

Storable(3pm)						User Contributed Perl Documentation					     Storable(3pm)

NAME

       Coro::Storable - offer a more fine-grained Storable interface

SYNOPSIS

	use Coro::Storable;

DESCRIPTION

       This module implements a few functions from the Storable module in a way so that it cede's more often. Some applications (such as the
       Deliantra game server) sometimes need to load large Storable objects without blocking the server for a long time.

       This is being implemented by using a perlio layer that feeds only small amounts of data (4096 bytes per call) into Storable, and
       "Coro::cede"'ing regularly (at most 100 times per second by default, though).

       As Storable is not reentrant, this module also wraps most functions of the Storable module so that only one freeze or thaw is done at any
       one moment (and recursive invocations are not currently supported).

FUNCTIONS

       $ref = thaw $pst
	   Retrieve an object from the given $pst, which must have been created with "Coro::Storable::freeze" or
	   "Storable::store_fd"/"Storable::store" (sorry, but Storable uses incompatible formats for disk/mem objects).

	   This function will cede regularly.

       $pst = freeze $ref
	   Freeze the given scalar into a Storable object. It uses the same format as "Storable::store_fd".

	   This functino will cede regularly.

       $pst = nfreeze $ref
	   Same as "freeze" but is compatible to "Storable::nstore_fd" (note the "n").

       $pst = blocking_freeze $ref
	   Same as "freeze" but is guaranteed to block. This is useful e.g. in "Coro::Util::fork_eval" when you want to serialise a data structure
	   for use with the "thaw" function for this module. You cannot use "Storable::freeze" for this as Storable uses incompatible formats for
	   memory and file images, and this module uses file images.

       $pst = blocking_nfreeze $ref
	   Same as "blocking_freeze" but uses "nfreeze" internally.

       $guard = guard
	   Acquire the Storable lock, for when you want to call Storable yourself.

	   Note that this module already wraps all Storable functions, so there is rarely the need to do this yourself.

AUTHOR

	Marc Lehmann <schmorp@schmorp.de>
	http://home.schmorp.de/

perl v5.14.2							    2012-04-13							     Storable(3pm)

Linux and UNIX Man Pages

coro::util(3pm) [debian man page]

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