php进程间通讯实例分析

本文实例讲述了php进程间通讯的方法。分享给大家供大家参考，具体如下：

php单进程单线程处理批量任务太慢了,受不鸟了,但是php不能多线程,最终选择了多进程处理批量任务.

php多进程主要使用for进行分裂,然后利用的unix/linux的信号量进行进程间通讯.

本例使用的是:生产者=>消费者=>收集器,的模式.

<?php
// ===== 全局变量 =====
// ipc进程间通讯
$key = ftok(__FILE__, "a");
$queue = msg_get_queue($key);
// 进程ID
$producer_pid = 0;
$consumers_pid = array();
$collector_pid = posix_getpid();
// ===== 消费者 =====
for ($i=0; $i < 2; $i++) {
 $consumer_pid = pcntl_fork();
 if ($consumer_pid == -1) {
 exit("could not fork!\n");
 } else if ($consumer_pid) {
 // pcntl_wait($status);
 echo "consumer_pid: $consumer_pid\n";
 $consumers_pid[] = $consumer_pid;
 } else {
 $pid = posix_getpid();
 echo "consumer_pid: $pid start\n";
 while (true) {
 msg_receive($queue, $pid, $msgtype, 1024, $message);
 if ($message == "exit") {
 break;
 }
 // 数据处理
 $n = intval($message);
 msg_send($queue, $collector_pid, $n * $n);
 }
 exit("consumer ok!\n");
 }
}
// ===== 产生者 =====
$producer_pid = pcntl_fork();
if ($producer_pid == -1) {
 exit("could not fork!\n");
} else if ($producer_pid) {
 // pcntl_wait($status);
 echo "producer_pid: $producer_pid\n";
} else {
 $pid = posix_getpid();
 echo "producer_pid: $pid start\n";
 $n = 0;
 for ($i=0; $i < 10; $i++) {
 foreach ($consumers_pid as $consumer_pid) {
 $n++;
 msg_send($queue, $consumer_pid, $n);
 }
 sleep(1);
 }
 foreach ($consumers_pid as $consumer_pid) {
 msg_send($queue, $consumer_pid, "exit");
 }
 sleep(1);
 msg_send($queue, $collector_pid, "exit");
 exit("producer ok!\n");
}
// ===== 收集器 =====
while (true) {
 msg_receive($queue, $collector_pid, $msgtype, 1024, $message);
 if ($message == "exit") {
 break;
 }
 echo sprintf("% 5d: %d\n", $msgtype, $message);
}
exit("collector ok!\n");