swoole-src: Table object does not work across threads

I can confirm that table objects do not work across threads. Documents should be updated to clarify.

As stated in https://www.swoole.co.uk/docs/modules/swoole-table

Why to use swoole table

• High performance, the single thread read/write speed is more than 2 millions per second.
• Can be used by multiple threads or processes.
• In application counters storage.

Code I used

<?php

class A extends Thread {
    public $table;
    public function __construct($table) {
        $this->table = $table;
    }
    public function run() {
        if (!$this->table->set('test_key', array('id' => 1))) {
            echo "could not set\n";
        }
    }
}

class B extends Thread {
    public $table;
    public function __construct($table) {
        $this->table = $table;
    }
    public function run() {
        $ret = $this->table->get('test_key');
        if (!($ret and is_array($ret) and $ret['id'] == 1)) {
            echo "some other error\n";
        }
    }
}

$table = new swoole_table(65536);
$table->column('id', swoole_table::TYPE_INT);
$table->create();

$a = new A($table);
$a->start();

$b = new B($table);
$b->start();

$b->join();

expected results: get ‘test_key’ from table

actual results:

PHP Fatal error:  Uncaught Error: Call to a member function set() on null in /home/jason/chan_thread.php:9
Stack trace:
#0 [internal function]: A->run()
#1 {main}
  thrown in /home/jason/chan_thread.php on line 9
PHP Fatal error:  Uncaught Error: Call to a member function get() on null in /home/jason/chan_thread.php:22
Stack trace:
#0 [internal function]: B->run()
#1 {main}
  thrown in /home/jason/chan_thread.php on line 22