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

NAME

       Coro::Debug - various functions that help debugging Coro programs

SYNOPSIS

	use Coro::Debug;

	our $server = new_unix_server Coro::Debug "/tmp/socketpath";

	$ socat readline unix:/tmp/socketpath

DESCRIPTION

       This module is an AnyEvent user, you need to make sure that you use and run a supported event loop.

       This module provides some debugging facilities. Most will, if not handled carefully, severely compromise the security of your program, so
       use it only for debugging (or take other precautions).

       It mainly implements a very primitive debugger that is evry easy to integrate in your program:

	  our $server = new_unix_server Coro::Debug "/tmp/somepath";
	  # see new_unix_server, below, for more info

       It lets you list running coroutines:

		   state (rUnning, Ready, New or neither)
		   |cctx allocated
		   ||  resident set size (octets)
		   ||  |   scheduled this many times
	  > ps	   ||  |   |
	       PID SC  RSS USES Description		 Where
	  14572344 UC  62k 128k [main::]		 [dm-support.ext:47]
	  14620056 -- 2260   13 [coro manager]		 [Coro.pm:358]
	  14620128 -- 2260  166 [unblock_sub scheduler]  [Coro.pm:358]
	  17764008 N-  152    0 [EV idle process]	 -
	  13990784 -- 2596  10k timeslot manager	 [cf.pm:454]
	  81424176 --  18k 4758 [async pool idle]	 [Coro.pm:257]
	  23513336 -- 2624    1 follow handler		 [follow.ext:52]
	  40548312 --  15k 5597 player scheduler	 [player-scheduler.ext:13]
	  29138032 -- 2548  431 music scheduler 	 [player-env.ext:77]
	  43449808 -- 2260 3493 worldmap updater	 [item-worldmap.ext:115]
	  33352488 --  19k 2845 [async pool idle]	 [Coro.pm:257]
	  81530072 --  13k  43k map scheduler		 [map-scheduler.ext:65]
	  30751144 --  15k 2204 [async pool idle]	 [Coro.pm:257]

       Lets you do backtraces on about any coroutine:

	  > bt 18334288
	  coroutine is at /opt/cf/ext/player-env.ext line 77
		  eval {...} called at /opt/cf/ext/player-env.ext line 77
		  ext::player_env::__ANON__ called at -e line 0
		  Coro::_run_coro called at -e line 0

       Or lets you eval perl code:

	  > 5+7
	  12

       Or lets you eval perl code within other coroutines:

	  > eval 18334288 caller(1); $DB::args[0]->method
	  1

       It can also trace subroutine entry/exits for most coroutines (those not having recursed into a C function), resulting in output similar to:

	  > loglevel 5
	  > trace 94652688
	  2007-09-27Z20:30:25.1368(5) [94652688] enter Socket::sockaddr_in with (8481,x{7f}x{00}x{00}x{01})
	  2007-09-27Z20:30:25.1369(5) [94652688] leave Socket::sockaddr_in returning (x{02}x{00}...)
	  2007-09-27Z20:30:25.1370(5) [94652688] enter Net::FCP::Util::touc with (client_get)
	  2007-09-27Z20:30:25.1371(5) [94652688] leave Net::FCP::Util::touc returning (ClientGet)
	  2007-09-27Z20:30:25.1372(5) [94652688] enter AnyEvent::Impl::Event::io with (AnyEvent,fh,GLOB(0x9256250),poll,w,cb,CODE(0x8c963a0))
	  2007-09-27Z20:30:25.1373(5) [94652688] enter Event::Watcher::__ANON__ with (Event,poll,w,fd,GLOB(0x9256250),cb,CODE(0x8c963a0))
	  2007-09-27Z20:30:25.1374(5) [94652688] enter Event::io::new with (Event::io,poll,w,fd,GLOB(0x9256250),cb,CODE(0x8c963a0))
	  2007-09-27Z20:30:25.1375(5) [94652688] enter Event::Watcher::init with (Event::io=HASH(0x8bfb120),HASH(0x9b7940))

       If your program uses the Coro::Debug::log facility:

	  Coro::Debug::log 0, "important message";
	  Coro::Debug::log 9, "unimportant message";

       Then you can even receive log messages in any debugging session:

	  > loglevel 5
	  2007-09-26Z02:22:46(9) unimportant message

       Other commands are available in the shell, use the "help" command for a list.

FUNCTIONS

       None of the functions are being exported.

       log $level, $msg
	   Log a debug message of the given severity level (0 is highest, higher is less important) to all interested parties.

       stderr_loglevel $level
	   Set the loglevel for logging to stderr (defaults to the value of the environment variable PERL_CORO_STDERR_LOGLEVEL, or -1 if missing).

       session_loglevel $level
	   Set the default loglevel for new coro debug sessions (defaults to the value of the environment variable PERL_CORO_DEFAULT_LOGLEVEL, or
	   -1 if missing).

       trace $coro, $loglevel
	   Enables tracing the given coroutine at the given loglevel. If loglevel is omitted, use 5. If coro is omitted, trace the current
	   coroutine. Tracing incurs a very high runtime overhead.

	   It is not uncommon to enable tracing on oneself by simply calling "Coro::Debug::trace".

	   A message will be logged at the given loglevel if it is not possible to enable tracing.

       untrace $coro
	   Disables tracing on the given coroutine.

       command $string
	   Execute a debugger command, sending any output to STDOUT. Used by "session", below.

       session $fh
	   Run an interactive debugger session on the given filehandle. Each line entered is simply passed to "command".

       $server = new_unix_server Coro::Debug $path
	   Creates a new unix domain socket that listens for connection requests and runs "session" on any connection. Normal unix permission
	   checks and umask applies, so you can protect your socket by puttint it into a protected directory.

	   The "socat" utility is an excellent way to connect to this socket:

	      socat readline /path/to/socket

	   Socat also offers history support:

	      socat readline:history=/tmp/hist.corodebug /path/to/socket

	   The server accepts connections until it is destroyed, so you must keep the return value around as long as you want the server to stay
	   available.

       $server = new_tcp_server Coro::Debug $port
	   Similar to "new_unix_server", but binds on a TCP port. Note that this is usually results in a gaping security hole.

	   Currently, only a TCPv4 socket is created, in the future, a TCPv6 socket might also be created.

AUTHOR

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

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