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While examining it, pay close attention to the two condition variables that lay at the heart of the application: $pool: Used by the main thread to signal that a new line is ready It is waited on by all the service threads Its value is programmed to hold the number of threads currently waiting, so the main thread knows whether or not it can send a signal or if it must wait for a service thread to become ready $line: Used by whichever thread is woken by the signal to $pool Lets the main thread know that the line of input read by the main thread has been copied to the service thread and that a new line may now be read The value is the text of the line that was read.

The maximum memory that MySQL can consume is then defined as follows:

The two condition variables allow the main thread and the pool of service threads to cooperate with each other This ensures that each line read by the main thread is passed to one service thread both quickly and safely: #!/usr/bin/perl # threadpoolpl use warnings; use strict; use threads; use threads::shared; my $threads = 3; # number of service threads to create my $line : shared= ""; # parent lock variable and input line set to "" here, we # assign each new line of input to it, and set it to 'undef' # when we are finished to tell service threads to quit my $pool : shared = 0; # child lock variable and pool counter set to 0 here, # service threads increment it when they are ready for input.

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# 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, wait for a service thread to become available, # signal that a new line is ready, then wait for whichever thread picked # up the line to signal to continue while ($line = <>) { chomp $line; thr_print "Main thread got '$line'\n"; # do not signal until at least one thread is ready if ($pool==0) { thr_print "Main thread has no service threads available, yielding\n"; threads->yield until $pool>0; } thr_print "Main thread has $pool service threads available\n"; # signal that a new line is ready { lock $pool; cond_signal $pool; } thr_print "Main thread sent signal, waiting to be signaled\n"; # wait for whichever thread wakes up to signal us { lock $line; cond_wait $line; } thr_print "Main thread received signal, reading next line\n"; } thr_print "All lines processed, sending end signal\n"; # set the line to special value 'undef' to indicate end of input $line = undef; { lock $pool; # tell all threads to pick up this 'line' so they all quit cond_broadcast $pool; } thr_print "Main thread ended\n"; exit 0; # the thread subroutine--block on lock variable until work arrives sub process_thing { my $self=threads->self; my $thread_line;

About the same time as ColdFusion MX 7 was released, another community released a new web application framework: Ruby on Rails. Tired of all the XML used for configuring applications, this

thr_print "Thread ",$self->tid," started\n"; while (1) { # has the 'quit' signal been sent while we were busy last unless (defined $line); # wait to be woken up thr_print "Thread ",$self->tid," waiting\n"; { lock $pool; $pool++; cond_wait $pool; #all threads wait here for signal $pool--; } # retrieve value to process thr_print "Thread ",$self->tid," signaled\n"; $thread_line = $line; # was this the 'quit' signal Check the value sent last unless (defined $thread_line); # let main thread know we have got the value thr_print "Thread ",$self->tid," retrieved data, signaling main\n"; { lock $line; cond_signal $line; } # do private spurious things to it chomp ($thread_line=uc($thread_line)); thr_print "Thread ",$self->tid," got '$thread_line'\n"; } thr_print "Thread ",$self->tid," ended\n"; } Once the basic idea of a condition variable is understood, the way in which this application works becomes clearer However, there are a few aspects still worth pointing out.

In particular, the $pool variable is used by the main thread to ensure that it only sends a signal when there is a service thread waiting to receive it To achieve this, we increment $pool immediately before cond_wait and decrement it immediately afterwards By doing this, we ensure that $pool accurately reflects the number of waiting service threads; if it is zero, the main thread uses yield to pass on execution until a service thread becomes available again The means by which the application terminates is also worth noting Threads do not necessarily terminate just because the main thread does, so in order to exit a threaded application cleanly, we need to make sure all the service threads terminate, too This is especially important if resources needed by some threads are being used by others.

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