Unblocking a blocked read or write operation

Sometimes, you need to unblock a read or write operation based on an external event. This recipe shows how you can unblock such an I/O operation.

How to do it...

• If you want to unblock an I/O operation with no intention of reusing the connection again, close the connection asynchronously:

  cancel:=make(chan struct{})
  done:=make(chan struct{})
  // Close the connection if a message is sent to cancel channel
  go func() {
     select {
        case <-cancel:
           conn.Close()
        case <-done:
     }
  }()
  go handleConnection(conn)

• If you want to unblock an I/O operation but not terminate it, set the deadline to now:

  unblock:=make(chan struct{})
  // Unblock the connection if a message is sent to unblock channel
  go func() {
    <-unblock
    conn.SetDeadline(time.Now())
  }()
  timedout...