process-wait-with-timeout wait-reason timeout &optional wait-function &rest wait-arguments => bool
A string describing the reason that the process is waiting.
A non-negative real or nil.
A function to test.
The arguments to apply to wait-function.
This function uses process-wait to suspend the current Lisp process until the predicate wait-function applied to wait-arguments returns true, or until timeout seconds have passed.
wait-function is called periodically by the scheduler, but in situations where you want more control over the timing you should consider using process-wait-local instead of process-wait and then call process-poke in the process that is expected to make the wait-function return true.
wait-function is called with interrupts blocked. It should therefore not allow interrupts, because this could cause deadlocks.
bool is nil if the timeout occurred before wait-function returned true. bool is true otherwise.
process-join
process-poke
process-wait
process-wait-local-with-timeout
process-wait-local-with-timeout-and-periodic-checks
Process Waiting and communication between processes
LispWorks User Guide and Reference Manual - 20 Sep 2017