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The Thread::Status module is a handy way to get debugging information from a threaded application. While it can be loaded directly into an application, it is more usual to load it from the command line: > perl -MThread::Status mythrapp.pl

This will print to standard error, every five seconds, a report of all running threads. We can also control the output destination, output format, and number of stack frames (callers): > perl -Mthread::Status=output,status.log,format=xml,callers=3 mythrapp.pl Thread::Status does have one drawback, however: it currently requires Thread::Signal. This was a standard module prior to Perl 5.8 that is now mostly deprecated as a result of the introduction of safe signals. In the older implementation of threads, applications that needed to handle process signals need to use the Thread::Signal module in order to have signals delivered to threads reliably. The newer implementation does not quite replace it, however, so the older version is available from CPAN if needed (for example, for Thread::Status).

Summary

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Listing 31-4. controllers/todo.cfc <cfcomponent> <cffunction name="init"> <cfargument name="fw" /> <cfset variables.fw = arguments.fw /> <cfreturn this /> </cffunction> <cffunction name="add"> <cfargument name="rc" /> <cfif not len( trim( rc.name ) )> <cfset rc.message = 'Name is required' /> <cfset variables.fw.redirect( 'todo.new', 'message' ) /> </cfif> </cffunction> <cffunction name="endAdd"> <cfargument name="rc" /> <cfset variables.fw.redirect( 'todo.list' ) /> </cffunction> <cffunction name="endDone"> <cfargument name="rc" /> <cfset variables.fw.redirect( 'todo.list' ) /> </cffunction> </cfcomponent> The first thing to note here is the init() method the constructor passes a single argument called fw (the instance of FW/1). This is how controllers can get access to the FW/1 API. The add() method performs validation; if the name field is missing from the request context, it sets a message in the request context and redirects to the todo.new action, preserving the message key in the request context. The endAdd() and endDone() methods are called at the end of requests for the todo.add action and the todo.done action, respectively, and they redirect back to the list of todo items. You will need a services/todo.cfc file that looks like the code in Listing 31-5. Listing 31-5. services/todo.cfc <cfcomponent> <cffunction name="add"> <cfargument name="name" /> <cfset var newItem = 0 /> <cfquery name="newItem" datasource="todo"> insert into todo ( name ) values ( <cfqueryparam cfsqltype="cf_sql_varchar" value="#arguments.name#" /> ) </cfquery> </cffunction>

In this chapter, we first looked at sending and receiving signals from Perl processes and writing signal handlers to deal with signals intelligently We saw how the die and warn functions can be trapped with pseudo-signal handlers and investigated strategies and caveats in the implementation of signal-handling subroutines We also examined the alarm signal and used it to trigger timed events to abort hung processes We went on to example multiprocessing applications and the use of fork, both explicitly and implicitly via open, to start up child processes When creating child processes, it is very important to manage them properly and in particular collect or reap their exit status when they terminate Alternatively, a child process can be made independent of its parent by changing its process group, also called daemonizing it.

The script will also examine the recent usage of the machine and suggest changes that would improve performance based on actual use You can run this script against your live server It is not intrusive and does not impose any significant load in itself, so you can use it to health check your machine on a regular basis To install the script, you need to download it to your database server The author of the script has registered the domain mysqltunerpl and made the script the equivalent of the home page So to download and install it, just follow the step here..

We also looked at communicating between processes using pipes, paired sockets, and Unix System V IPC: message queues, semaphores, and shared memory segments While fork is a standard Unix system call, Windows has no equivalent concept, and so Perl instead emulates fork using interpreter threads This turns out to be a fairly impressive emulation that allows many multiprocessing Perl applications to run on Windows and Unix almost identically Finally, we looked at Perl s implementation of threads, newly overhauled in Perl 58 The new implementation of threads is called interpreter threads, and it differs from the older version in Perl 56 and earlier, in that data is not automatically shared between threads unless and until we ask for it.

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