SYS$CLREF (OpenVMS) SYS$CLREF (OpenVMS)
NAME
semctl - perform semaphore control operations
SYS$CLREF Clear an event flag
EXPLAINATION
The Digital UNIX semctl system call is similiar to the OpenVMS
SYS$CLREF system service in that they both set synchronization values.
If the semaphore is being used as a binary semaphore, the semctl func‐
tion can be called to explicitly set a semaphore value in the semaphore
set to 1. This is necessary since a 0 value indicates that a resouces
is held. Typically, semctl is called to initialize a semaphore after
creation.
RELATED INFORMATION
Digital UNIX Functions:
semop(2), semget(2), semctl(2), ipcs(1) delim off
SYS$CLREF (OpenVMS)
