sema man page on HP-UX

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sema(5)								       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       The  tunable  is	 obsolete.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 sema‐
       phores 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	 inde‐
       pendent 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  val‐
       ues.  For information about the effects of installation on tunable val‐
       ues, 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)
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