sema(5)sema(5)NAMEsema - 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The tunable is obsolete.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 ALSOipcs(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)