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There is one major difference between the older implementation of threads provided in Perl 5.6 and earlier and the interpreter threads available in Perl 5.8 onward: data is automatically shared in the older model, and never shared, unless we ask for it, in the newer one. The older model mirrors the behavior of the underlying thread support provided by the operating system, but there is no reason for Perl to mimic this behavior in its own threads, so instead the interpreter tracks the use of data by threads and duplicates unshared data as needed. This is actually more convenient, at least for code that was not written with threads in mind, since it means that by default threads can never inadvertently interfere with each other by overwriting each other s data. To actually share data, we make use of the threads::shared module, which provides the share function to mark a variable as shared across all threads. In actuality, this simply switches off the smart duplication of data that the interpreter would ordinarily carry out, for indicated variables only. If the threads module has not been loaded previously, share and other functions like lock and cond_wait that are also provided by this module are exported as nonfunctional stubs. This means

To solve that problem, a variety of frameworks have appeared over the years All of the popular frameworks work by routing requests through a centralized system that examines URL variables to determine what to do next, calling components and including templates to generate the HTML sent back to the user Fusebox, the granddaddy of these frameworks, was in its early days extremely simple Your indexcfm page contained a big cfswitch statement, and each cfcase branch used cfinclude to pull in some business logic (eg, a query) and a display page Teamed with a naming convention, Fusebox brought structure and maintainability to your application Over time, Fusebox grew and became more sophisticated, and more complicated With version 40, it introduced XML as the way to specify application flow instead of just code.

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our code will still run in a nonthreaded context, but it also means we must make sure to load threads first: use threads; use threads::shared; Once a variable is shared, each thread will see the same underlying storage when the variable is accessed, rather than getting its own copy: my $answer = 42; share($answer); my @array = (1,2,3); share(@array); If we know in advance which variables we want to share, which is generally the case, we can use the shared attribute instead: my $answer : shared = 42; my @array : shared = qw(1 2 3); my %hash : shared = (one => 1, two => 2, three => 3); We are not limited to sharing declared variables. We can also create a new anonymous reference and share it all in one go. However, since the subroutine normally expects a variable argument, we must call it with & to suppress the prototype: my $aref = &share([1 2 3]); Either way, once a variable is shared, all threads have access to the same data. In order to prevent them from overwriting each other and coordinate access to the shared data, we now need to apply a lock so that only one thread can access it at any given moment.

When multiple threads share data, we sometimes have problems stopping them from treading on each other s toes Since data is not shared between threads by default, we can largely ignore this problem for code that does not choose to share data, but the problem still exists when sharing common resources among a pool of threads The lock subroutine does handle this, however It takes any variable as an argument and places a lock on it so that no other thread may lock it for as long as the lock persists, which is defined by its lexical scope The distinction between lock and access is important; any thread can simply access the variable by not bothering to acquire the lock, so the lock is only good if all threads abide by it Just like flock for filehandles, a thread variable lock is advisory, not compelled.

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