An integer or
A generalized boolean.
process-send only sends the event: it is the responsibility of the receiving process to actually read the event and then interpret it. Reading is typically done by calling process-wait-for-event. Interpreting the event is up the caller of process-wait-for-event. In the "standard" situation, for example in a process started by CAPI, the object will be processed as an event by calling general-handle-event.
process-send actually uses the process-mailbox of process, creating a mailbox for process if it does not already have one. In principle object can be read by another process, by calling mailbox-read (or process-wait-for-event) on the mailbox.
fixnum-- use the value of change-priority as the new priority.
t-- set the priority to the interactive priority.
:default-- set the priority to the normal running priority.
error-if-dead-p defaults to
nil, which means that if
process-send is called with a dead process, it just returns false. If error-if-dead-p is non-nil, when
process-send is called on a dead process it signals a continuable error.
limit defaults to
nil. If it is non-nil, it must be a positive integer that specifies the maximum size to which
process-send may expand the mailbox of the process. When limit is non-nil.
process-send adds the object to the mailbox as if by
(mailbox-send-limited mailbox object limit timeout)
See mailbox-send-limited for details.
process-send returns true if it put the object in the mailbox of the process and false otherwise. The latter can happen either because the process is dead, or because the process's mailbox is full and reached the size specified by limit and timeout is non-nil.
LispWorks User Guide and Reference Manual - 20 Sep 2017