Shared data

Data sharing should be explicitly predeclared using:

use threads::shared;

The shared variables should have the special attribute:

my $a : shared = 2;
my $b : shared;

It is important to guard parts of the code that accesses and modifies shared variables using lock($var) function:

{ lock($a); lock($b); $b = $a + 2; }

There is no unlock(), the implicit unlocking occurs at the end of the perl block.

There are several modules to make data sharing convenient.

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