组件ThreadPool::isClosed()

ThreadPool::isClosed() ​

(PHP 8.6+, True Async 1.0)

php
public ThreadPool::isClosed(): bool

如果池已通过 close() 或 cancel() 关闭，则返回 true。如果池仍在接受任务，则返回 false。

返回值 ​

bool — 如果池已关闭则为 true；如果仍处于活跃状态则为 false。

示例 ​

示例 #1 提交前检查状态 ​

php
<?php

use Async\ThreadPool;
use function Async\spawn;
use function Async\await;

spawn(function() {
    $pool = new ThreadPool(workers: 2);

    $future = $pool->submit(fn() => 'done');

    var_dump($pool->isClosed()); // bool(false)

    $pool->close();

    var_dump($pool->isClosed()); // bool(true)

    echo await($future), "\n"; // done
});

示例 #2 在共享上下文中保护 submit ​

php
<?php

use Async\ThreadPool;
use function Async\spawn;
use function Async\await;

function trySubmit(ThreadPool $pool, callable $task): mixed
{
    if ($pool->isClosed()) {
        return null;
    }
    return await($pool->submit($task));
}

spawn(function() {
    $pool = new ThreadPool(workers: 2);
    echo trySubmit($pool, fn() => 'hello'), "\n"; // hello
    $pool->close();
    var_dump(trySubmit($pool, fn() => 'missed')); // NULL
});

参见 ​