Signals to unblock the listener blocked at the vortex_listener_wait.
Under normal circumstances, this function must not be called directly from user space. This function actually unblock waiting listeners on vortex_listener_wait function.
Vortex already call to this function once the vortex_exit function is called.
Because some designs could require to control how memory is released once the listener is unblocked from the vortex_listener_wait, this function could help to control an trigger that unblock operation.
Futher calls to this function will cause no operation. This function is thread safe.