php进程间通讯实例分析

<?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");