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|Oracle Solaris Tunable Parameters Reference Manual Oracle Solaris 10 8/11 Information Library|
System V semaphores provide counting semaphores in the Oracle Solaris OS. A semaphore is a counter used to provide access to a shared data object for multiple processes. In addition to the standard set and release operations for semaphores, System V semaphores can have values that are incremented and decremented as needed (for example, to represent the number of resources available). System V semaphores also provide the ability to do operations on a group of semaphores simultaneously as well as to have the system undo the last operation by a process if the process dies.
For information about the changes to semaphore resources in the Oracle Solaris 10 release, see System V IPC Configuration.
For detailed information about using the new resource controls in the Oracle Solaris 10 release, see Chapter 6, Resource Controls (Overview), in System Administration Guide: Oracle Solaris Containers-Resource Management and Oracle Solaris Zones.
For legacy information about the obsolete System V semaphore parameters, see Parameters That Are Obsolete or Have Been Removed.