a strange problem for deadline_timer

[cchehewo <china.ygw@…>]

os:cent os 6.4 32bit. boost:1.55.0

I have these codes for tcp async_connect: session->tcp_socket().async_connect(ep, m_strand.wrap(boost::bind(

&ifstiotcp::_connected, this, session, boost::asio::placeholders::error)));

timer.expires_from_now(boost::posix_time::seconds(5), ec); timer.async_wait(m_strand.wrap(boost::bind(&ifstiotcp::_connect_timeout, this, session, boost::asio::placeholders::error)));

and, in _connected function to cancel timer: timer.cancel(ec);

and, in _connected_timeout function: if (boost::asio::error::operation_aborted != ec) {

timeout in here

}

now, a strange problem as follows: 1) when run to _connected function and cancel deadline_timer success; 2) after 5 seconds, run the 'timeout in here'; 3) anyone has the same problem?