Course of Raku / Functional, concurrent, reactive, and web programming / Concurrent programming / Threads / Exercises / Two threads

Solution: Two threads

Here is a possible solution to the task.

Code

my ($x, $y);
my $a = Thread.start({ $x = 10 * 10 });
my $b = Thread.start({ $y = 20 * 20 });
$a.finish;
$b.finish;
say $x + $y;

🦋 You can find the source code in the file two-threads.raku.

Output

Comments

The two threads run concurrently, each writing its result into its own shared variable.
Reading $x and $y happens only after both .finish calls, so the results are guaranteed to be ready: 100 + 400 is 500. Joining before reading is what makes the value reliable.

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