Tests whether a mailbox is empty.
mp
mailbox-empty-p mailbox => bool
mailbox
A mailbox
bool
A boolean
The function mailbox-empty-p returns t if the given mailbox is empty and nil otherwise.
mailbox-empty-p
t
nil
mailbox-not-empty-p mailbox-send mailbox-peek mailbox-read make-mailbox Communication between processes and synchronization
LispWorks User Guide and Reference Manual - 20 Sep 2017