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The tunable is obsolete.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)
