PHP 进程池与轮询调度算法实现多任务

<?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 $instance */
 fprintf(STDOUT,"master 进程 %d
",$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[$i]->pid,9);
 }
 fprintf(STDOUT,"master shutdown %d
",$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
",posix_getpid(),$content,$file);
 }
 exit(0);
}
$instance = new instance();
processPool($instance,5);