按照手册写好了命令行工具webman,在win10下执行报错了

PS D:\web\zxc> php .\webman config:mysql

Fatal error: Uncaught Error: Call to undefined function pcntl_alarm() in D:\web\shopz\vendor\workerman\workerman\Timer.php:127
Stack trace:
#0 D:\web\shopz\support\bootstrap\LaravelDb.php(78): Workerman\Timer::add(55, Object(Closure))
#1 D:\web\shopz\webman(26): support\bootstrap\LaravelDb::start(NULL)
#2 {main}
  thrown in D:\web\shopz\vendor\workerman\workerman\Timer.php on line 127