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.
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