s command

The s command displays or changes the semaphore status.

Syntax

s [*|sem]{[?|+|-]}

`sem`	Specifies the semaphore expressed from 0 to 4.
*	Specifies all semaphores.
+	Sets or locks the specified semaphore.
-	Unlocks the specified semaphore.
?	Displays: 00: O pid=0985 01: O pib=0023 02: 03: O pib=001A where semaphore 0 is owned by the process with the PID number of x'0985'. Only semaphore 0 displays with the UNIX PID number instead of the D3 PIB number semaphore 1 is busy, owned by the PIB x'23' and has at least one process waiting on it (W). semaphore 2 is free. semaphore 3 is busy, owned by process x'1A' but has no process waiting on it.

If the owner PIB is not setup when the command is executed, the message pib=? displays. Re-enter the command again to set the owner PIB.