Answer / rock

Dead Lock/Process lock


A process-lock is a destruct which provides a mechanism for
interlocking process execution. A process-lock is either
free or it is seized by exactly one process. When a process
is seized, a non-nil value is stored in the lock (in the
slot named locker). Usually this is the process which
seized the lock, but can be any Lisp object other than nil.
Any process which tries to seize the lock before it is
released will block. This includes the process which has
seized the lock; the with-process-lock macro protects
against such recursion.

Dead Lock
An error with the computer that occurs when two programs
are trying to wait for a signal from the other program at
the same time.

boundry value range for the a and b where a/b=c conditions 1. if c <1000 2. if c b/w 1000 and 2000 3. if c > 2000

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