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This prevents the output of different threads from getting intermingled. For simple tasks like this one, locked subroutines are an acceptable solution to an otherwise tricky problem that would require at least a lock variable. For longer tasks, locked subroutines can be a serious bottleneck, affecting the performance of a threaded application, so we should use them with care and never for anything likely to take appreciable time. As of Perl 5.8.3, cond_wait can take two shared variable arguments; the first is the signal variable, the second the lock variable: cond_wait $sigvar,$lockvar; It works identically to the one-argument form, except for the division of responsibility. The objective is to allow us to signal the same variable several times and unlock more than one thread concurrently, by having different threads use different lock variables for the same signal variable. The number of different lock variables in play is equal to the total number of concurrent threads the signal variable can trigger. Also from Perl 5.8.3 onwards, the threads module also provides the cond_timedwait function. It works identically to its untimed counterpart earlier, but it takes an additional timeout value in seconds. The return value of cond_timedwait is true if a signal was received and false if the timeout was reached first. This lets us write code that can periodically stop waiting to do other tasks: { lock $line; while (! cond_timedwait($line,10)) { thr_print "Yawn...\n"; } } As with cond_wait, we can split the signal and lock variables if we wish: cond_timedwait $sigvar,$lockvar,$timeout; This works identically to the two-argument form, except for the division of responsibility. As with cond_wait, this form of the function allows us to signal the same variable several times and unlock more than one thread concurrently.

Although it works perfectly well, the preceding application is a little more complex than it needs to be. Most forms of threads whatever language or platform they reside on support the concept of semaphores, and Perl is no different. We covered IPC semaphores earlier, and thread semaphores are very similar. They are essentially numeric flags that take a value of zero or any positive number and obey the following simple rules: Only one thread may manipulate the value of a semaphore in either direction at a time. Any thread may increment a semaphore immediately. Any thread may decrement a semaphore immediately if the decrement will not take it below zero. If a thread attempts to decrement a semaphore below zero, it will block until another thread raises the semaphore high enough. Perl provides thread semaphores through the Thread::Semaphore module, which implements semaphores in terms of condition variables the code of Thread::Semaphore is actually quite short as well as instructive. It provides one class method, new, and two object methods, up and down. new creates a new semaphore: $semaphore = new Thread::Semaphore; # create semaphore, initial value 1 $semaphore2 = new Thread::Semaphore(0) # create semaphore, initial value 0

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Getting Started with FW/1

up increments a semaphore: $semaphore->up; $semaphore->up(5); # increment semaphore by 1 # increment semaphore by 5

Finally, down decrements a semaphore, blocking if necessary: $semaphore->down; # decrement semaphore by 1 $semaphore->down(5); # decrement semaphore by 5 Depending on our requirements, we can use semaphores as binary stop/go toggles or allow them to range to larger values to indicate the availability of a resource. Here is an adapted form of our earlier threaded application, rewritten to replace the condition variables with semaphores: #!/usr/bin/perl # semaphore.pl use warnings; use strict; use threads; use Thread::Semaphore; my $threads = 3; # number of service threads to create my $line : shared = ""; # input line my $main = new Thread::Semaphore; # proceed semaphore, initial value 1 my $next = new Thread::Semaphore(0); # new line semaphore, initial value 0 # a locked print subroutine--stops thread output mingling { my $lock : shared; sub thr_print { lock $lock; print @_; } } # create a pool of three service threads foreach (1..$threads) { threads->create(\&process_thing); } # main loop: read a line, raise 'next' semaphore to indicate a line is # available, then wait for whichever thread lowered the 'next' semaphore # to raise the 'main' semaphore, indicating we can continue. while ($line = <>) { chomp $line; thr_print "Main thread got '$line'\n"; # notify service threads that a new line is ready $next->up; thr_print "Main thread set new line semaphore, waiting to proceed\n"; # do not proceed until value has been retrieved by responding thread $main->down; thr_print "Main thread received instruction to proceed\n"; } thr_print "All lines processed, sending end signal\n";

The first useful bit of information is the first part of the top display for this server. It tells us more about how much load is on the server, if it is swapping, and how much of the total memory the mysqld process is using (Figure 8 4).

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FW/1 is a single CFC that your Application.cfc extends. It implements the conventions described in the previous section, and then gets out of your way. It has a very simple API. It s designed to be invisible. To get started with FW/1, download the FW/1 zip file from http://fw1.riaforge.org and unzip it into an empty folder.

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