TaskGroup::seal

Seal the group to prevent new tasks.

TaskGroup::seal ​

(PHP 8.6+, True Async 1.0)

php
public TaskGroup::seal(): void

Seals the group. Any attempt to use spawn() or spawnWithKey() will throw an exception. Already running coroutines and queued tasks continue to execute.

Repeated calls are a no-op.

Examples ​

Example #1 Basic usage ​

php
<?php

use Async\TaskGroup;

spawn(function() {
    $group = new TaskGroup();

    $group->spawn(fn() => "task");
    $group->seal();

    try {
        $group->spawn(fn() => "another task");
    } catch (\Async\AsyncException $e) {
        echo $e->getMessage() . "\n";
        // "Cannot spawn tasks on a sealed TaskGroup"
    }
});

See Also ​