/**
* This is the class constructor, initializes the object.
* @access public
*/
public function __construct()
{
/* record pid of parent process */
self::$parent_pid = getmypid();
/* install signal handlers */
declare (ticks=1);
pcntl_signal(SIGHUP, array(&$this, 'signal_handler_sighup'));
pcntl_signal(SIGCHLD, array(&$this, 'signal_handler_sigchild'));
pcntl_signal(SIGTERM, array(&$this, 'signal_handler_sigint'));
pcntl_signal(SIGINT, array(&$this, 'signal_handler_sigint'));
pcntl_signal(SIGALRM, SIG_IGN);
pcntl_signal(SIGUSR2, SIG_IGN);
pcntl_signal(SIGBUS, SIG_IGN);
pcntl_signal(SIGPIPE, SIG_IGN);
pcntl_signal(SIGABRT, SIG_IGN);
pcntl_signal(SIGFPE, SIG_IGN);
pcntl_signal(SIGILL, SIG_IGN);
pcntl_signal(SIGQUIT, SIG_IGN);
pcntl_signal(SIGTRAP, SIG_IGN);
pcntl_signal(SIGSYS, SIG_IGN);
/* add barracuda specific prefork functions (doesn't hurt anything) */
$this->parent_function_prefork = array('db_clear_connection_cache', 'memcache_clear_connection_cache');
}