<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def get_connections_by_dest(self, dest):
        '''Search for all connections between this and another port.'''
        with self._mutex:
            res = []
            for c in self.connections:
                if c.has_port(self) and c.has_port(dest):
                    res.append(c)
            return res