欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

PHP实现简单的协程任务调度demo示例

程序员文章站 2022-06-03 12:52:39
本文实例讲述了php实现简单的协程任务调度。分享给大家供大家参考,具体如下:

本文实例讲述了php实现简单的协程任务调度。分享给大家供大家参考,具体如下:

<?php
class task
{
  protected $taskid;
  protected $coroutine;
  protected $sendvalue = null;
  protected $beforefirstyield = true;
  public function __construct($taskid, generator $coroutine)
  {
    $this->taskid = $taskid;
    $this->coroutine = $coroutine;
  }
  public function gettaskid()
  {
    return $this->taskid;
  }
  public function setsendvalue($sendvalue)
  {
    $this->sendvalue = $sendvalue;
  }
  public function run()
  {
    if ($this->beforefirstyield) {
      $this->beforefirstyield = false;
      return $this->coroutine->current();
    } else {
      $retval = $this->coroutine->send($this->sendvalue);
      $this->sendvalue = null;
      return $retval;
    }
  }
  public function isfinished()
  {
    return !$this->coroutine->valid();
  }
}
class scheduler
{
  protected $maxtaskid = 0;
  protected $taskmap = []; // taskid => task
  protected $taskqueue;
  public function __construct()
  {
    $this->taskqueue = new splqueue();
  }
  public function newtask(generator $coroutine)
  {
    $tid = ++$this->maxtaskid;
    $task = new task($tid, $coroutine);
    $this->taskmap[$tid] = $task;
    $this->schedule($task);
    return $tid;
  }
  public function schedule(task $task)
  {
    $this->taskqueue->enqueue($task);
  }
  public function run()
  {
    while (!$this->taskqueue->isempty()) {
      $task = $this->taskqueue->dequeue();
      $task->run();
      if ($task->isfinished()) {
        unset($this->taskmap[$task->gettaskid()]);
      } else {
        $this->schedule($task);
      }
    }
  }
}
function task1()
{
  for ($i = 1; $i <= 10; ++$i) {
    echo "this is task 1 iteration $i.\n";
    sleep(1);
    yield;
  }
}
function task2()
{
  for ($i = 1; $i <= 10; ++$i) {
    echo "this is task 2 iteration $i.\n";
    sleep(1);
    yield;
  }
}
$scheduler = new scheduler;
$scheduler->newtask(task1());
$scheduler->newtask(task2());
$scheduler->run();

运行结果:

this is task 1 iteration 1.
this is task 1 iteration 2.
this is task 1 iteration 3.
this is task 1 iteration 4.
this is task 1 iteration 5.
this is task 1 iteration 6.
this is task 1 iteration 7.
this is task 1 iteration 8.
this is task 1 iteration 9.
this is task 1 iteration 10.