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.

示例 #1 Example showing Future as return value

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

以上例程的输出类似于：

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.

示例 #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";
?>

以上例程的输出类似于：

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

类摘要

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

目录