The parallel\Future class

(0.8.0)

Futures

A Future represents the return value or uncaught exception from a task, and exposes an API for cancellation.

Exemple #1 Example showing Future as return value

<?php
$runtime = new \parallel\Runtime;
$future = $runtime->run(function(){
return "World";
});
printf("Hello %s\n", $future->value());
?>

Résultat de l'exemple ci-dessus est similaire à :

Hello World

The behaviour of a future also allows it to be used as a simple synchronization point even where the task does not return a value explicitly.

Exemple #2 Example showing Future as synchronization point

<?php
$runtime = new \parallel\Runtime;
$future = $runtime->run(function(){
echo "in child ";
for ($i = 0; $i < 500; $i++) {
if ($i % 10 == 0) {
echo ".";
}
}
echo " leaving child";
});

$future->value();
echo "\nparent continues\n";
?>

Résultat de l'exemple ci-dessus est similaire à :

in child .................................................. leaving child
parent continues

Synopsis de la classe

final class parallel\Future {
/* Resolution */
public value(): mixed
/* State */
public cancelled(): bool
public done(): bool
/* Cancellation */
public cancel(): bool
}

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