hpux man page for sema

sema(5) 							File Formats Manual							   sema(5)

NAME
       sema - enable or disable System V IPC semaphores at boot time

DESCRIPTION
       The tunable is obsolete.  The System V IPC semaphore subsystem is always enabled.

   Overview
       System V IPC is comprised of mechanisms for arbitrary processes to send and receive data messages, share virtual address space and use sem-
       aphores to synchronize execution.

       A System V semaphore is a synchronization method for user processes to synchronize or serialize access to common data and resources.   Each
       semaphore "set" has an ID, but each set can contain one or more independent semaphores.

       Semaphore  sets are created or initially accessed through using an application-specified "key", which can be generated by Operations on the
       set are performed through and Semaphore sets are removed through or the command.

WARNINGS
       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR
       was developed by AT&T.

SEE ALSO
       ipcs(1),   ipcrm(1),  semget(2),  semop(2),  semctl(2),	semaem(5),  semmni(5),	semmns(5),  semmnu(5),	semmsl(5),  semume(5),	semvmx(5),
       sysv_hash_locks(5).

							     Tunable Kernel Parameters							   sema(5)