听起来您需要使用x1e0 f1 a来调度作业。cron将只运行脚本/程序，因此其实现将与调度本身不同。
Cron只会fire/forget，所以你可以从它那里调用任何持续时间的流程（我正在看下面你对执行时间的评论--如果我误解了，请修改）

最后我用这样的方法解决了这个问题：
1.以url可调用的方式设计操作。例如：http://localhost/render-image/14523665
2.将挂起的操作存储在一个表中，如下所示：操作（操作ID、操作URL、操作状态）。
准备好后，我设计了一个简短的PHP脚本，它可以执行以下操作：

<?php
if( WORKER_IS_ONLINE !== true ) exit();
OperationsQueue::CleanQueue();
while( OperationsQueue::RunningOperations() < WORKER_MAX_OPERATIONS ) {
    launch_operation( OperationsQueue::DequeOperation() );
}
sleep( WORKER_SLEEP_TIME );
launch_operation( '/operations_queue/deque' );

此辅助函数（launch_operation和OperationsQueue类）执行以下操作（注意，它尚未实现）：

<?php 
define('WORKER_SLEEP_TIME', 15);     // Time to sleep between sweeps.
define('WORKER_HOST', 'localhost');  // Hostname where the operations will be performed.
define('WORKER_PORT', 80);       // Port where the operations will be performed.
define('WORKER_SOCKET_TIMEOUT', 80); // Port where the operations will be performed.
define('WORKER_MAX_OPERATIONS', 2);  // Max simultaneous operations.
define('WORKER_MAX_LAUNCHES', 2);    // Max operations launched within a sweep.
define('WORKER_IS_ONLINE', false);   // Bool value that marks whether the worker must be working or not.

function launch_operation($operation) {
    $fp = fsockopen(WORKER_HOST, WORKER_PORT, $errno, $errstr, WORKER_SOCKET_TIMEOUT);
    if ($fp) {
        $out  = 'GET ' . $operation . " HTTP/1.1\r\n";
        $out .= 'Host: ' . WORKER_HOST . "\r\n\r\n";
        fwrite($fp, $out);
        fclose($fp);
    }
}

class OperationsQueue {

    public static function RunningOperations(){
        // connect to DB an perform: SELECT COUNT(*) FROM operations WHERE status = 'PROCESSING';
        return 1;
    }
    public static function CleanQueue(){
        // connect to DB an perform: DELETE FROM operations WHERE status IN ('DONE', 'CANCELED');
    }
    public static function DequeOperation(){
        // connect to DB an perform: SELECT * FROM operations WHERE status = 'PENDING' ORDER BY id ASC LIMIT 0, 1;
        // UPDATE operations SET status = 'PROCESSING', tries = tries+1 WHERE id = $id;
        return 'operation_url';
    }

}

我想它可能对其他人有用如你所见，它将操作链起来。