phpshmop_open的有关问题

$p = new shared;
//$p->a = 'abcd';
//$p->b = 1234;
print_r($p->_all);
echo $p->b;

class shared {
  private $shm_id;
  private $shm_key = 0xff3;
  private $shm_size = 1024;
  function __construct() {
    $this->shm_id = shmop_open($this->shm_key, "c", 0644, $this->shm_size) or die('申请失败');
  }
  function __get($name) {
    $buf = shmop_read($this->shm_id, 0, $this->shm_size);
    $buf = unserialize(trim($buf));
    if($name == '_all') return $buf;
    return isset($buf[$name]) ? $buf[$name] : false;
  }
  function __set($name, $value) {
    $buf = shmop_read($this->shm_id, 0, $this->shm_size);
    $buf = unserialize(trim($buf));
    $buf[$name] = $value;
    $buf = serialize($buf);
    if(strlen($buf) >= $this->shm_size) die('空间不足');
    shmop_write($this->shm_id, $buf, 0) or die('写入失败');
  }
}

------解决方案--------------------
和你上一个帖子一样，讨论是在基于 php_shmop.dll 扩展的

linux 中有另外的方法，但原理是一样的
php_shmop 也可以在 linux 中编译，但他却是为 window 设计的


------解决方案--------------------
我就明着告诉你,你这个问题大了.

共享内存区需要加锁操作, php没法设置进程共享的mutex, 你可以同样适用一个system v 的sem二值信号量来做锁.