PHP 进程池与轮询调度算法实现多任务的示例代码

<?php
/**
 * Created by PhpStorm.
 * User: 1655664358@qq.com
 * Date: 2019/1/12
 * Time: 16:18
 */

$flag = 1;

class process
{
 public $pid;
 public $name;
 public $file;
 public $num;
}
class instance
{
 public $processIdx;
 public $proc = [];
 public $processNum;
}
function sigHandler($sigNo)
{
 global $flag;
 $flag = 0;
 echo "信号中断处理".PHP_EOL;
}
function processPool(instance &$instance,$num)
{

 if (!$instance||$num==0){
  fprintf(STDERR,"%s","参数错误");
  return 1;
 }
 $instance->processIdx = 0;
 $instance->processNum = $num;

 pcntl_signal(SIGINT,'sigHandler');
 pcntl_signal(SIGTERM,'sigHandler');

 $process = new process();
 for ($i=1;$i<=$num;$i++){
  $instance->proc[$i] = clone $process;
  $instance->proc[$i]->file = $i;
  $instance->proc[$i]->pid = pcntl_fork();
  $instance->processIdx = $i;
  if ($instance->proc[$i]->pid<0){
   exit("进程创建失败");
  }
  else if ($instance->proc[$i]->pid>0){
   //nothing
   continue;
  }else{

   worker($instance);
  }
 }
 master($instance);
 $exitProcess= [];
 while (1){
  for ($i=1;$i<=$num;$i++){
  //非阻塞方式回收子进程
   pcntl_waitpid($instance->proc[$i]->pid,$status,WNOHANG);
   if ($status){
    $exitProcess[] = $instance->proc[$i]->pid;
    fwrite(STDOUT,"worker#".$instance->proc[$i]->pid."-".$status,30);
   }
  }
  if (count($exitProcess)==$instance->processNum){
   exit(0);
  }
  usleep(1000);

 }

}
//简单的轮询算法 自己可以用队列，随机，链表，栈链，二叉树啥的折腾
function roundRobin(&$instance,$roll)
{
 /** @var instance $instance */
 return $instance->proc[$roll%$instance->processNum+1];
}

function master(&$instance)
{

 /** @var instance $instance */
 fprintf(STDOUT,"master 进程 %d\n",$instance->processIdx);
 global $flag;
 $roll = 0;
 while ($flag){
  pcntl_signal_dispatch();
  /** @var process $process */
  $process = roundRobin($instance,$roll++);
  echo "轮询的进程:".$process->pid.PHP_EOL;
  $file = $process->file;
  posix_mkfifo($file,0666);
  $fd = fopen($file,"w");
  fwrite($fd,"hi",2);
  sleep(1);

 }
 for ($i=1;$i<=$instance->processNum;$i++){
  posix_kill($instance->proc[$i]->pid,9);
 }
 fprintf(STDOUT,"master shutdown %d\n",$instance->processIdx);
}
function getProcess(&$instance)
{
 /** @var instance $instance */
 return $instance->proc[$instance->processIdx];
}
function worker(&$instance)
{
 /** @var process $process */
 $process = getProcess($instance);
 while (1){
  $file = $process->file;
  posix_mkfifo($file,0666);
  $fd = fopen($file,"r");
  $content = fread($fd,10);
  fprintf(STDOUT,"worker#%d读取的内容：%s file=%d\n",posix_getpid(),$content,$file);
 }
 exit(0);
}

$instance = new instance();
processPool($instance,5);