PHP多线程编程之管道通信实例分析

• 自动创建一个管道
• @param string $name 管道名字
• @param int $mode 管道的权限，默认任何用户组可以读写
  */
  function __construct($name = 'pipe',$mode = 0666)
  {
  $fifoPath = "/tmp/$name." . posix_getpid();
  if (!file_exists($fifoPath)) {
  if (!posix_mkfifo($fifoPath,$mode)) {
  error("create new pipe ($name) error.");
  return false;
  }
  } else {
  error( "pipe ($name) has exit.");
  return false;
  }
  $this->fifoPath = $fifoPath;
  }
  ///////////////////////////////////////////////////
  // 写管道函数开始
  ///////////////////////////////////////////////////
  function open_write()
  {
  $this->w_pipe = fopen($this->fifoPath,'w');
  if ($this->w_pipe == NULL) {
  error("open pipe {$this->fifoPath} for write error.");
  return false;
  }
  return true;
  }

function write($data)
{
return fwrite($this->w_pipe,$data);
}

function write_all($data)
{
$w_pipe = fopen($this->fifoPath,'w');
fwrite($w_pipe,$data);
fclose($w_pipe);
}

function close_write()
{
return fclose($this->w_pipe);
}
/////////////////////////////////////////////////////////
/// 读管道相关函数开始
////////////////////////////////////////////////////////
function open_read()
{
$this->r_pipe = fopen($this->fifoPath,'r');
if ($this->r_pipe == NULL) {
error("open pipe {$this->fifoPath} for read error.");
return false;
}
return true;
}
function read($byte = 1024)
{
return fread($this->r_pipe,$byte);
}
function read_all()
{
$r_pipe = fopen($this->fifoPath,'r');
$data = '';
while (!feof($r_pipe)) {
//echo "read one Kn";
$data .= fread($r_pipe,1024);
}
fclose($r_pipe);
return $data;
}
function close_read()
{
return fclose($this->r_pipe);
}
/**

• 删除管道
• @return boolean is success
  /
  function rm_pipe()
  {
  return unlink($this->fifoPath);
  }
  }
  ?>
  /
  有了这个类，就可以实现简单的管道通信了。*/