SYS$READEF (OpenVMS) SYS$READEF (OpenVMS)
NAME
semctl - perform semaphore control operations
SYS$READEF - Read event flag
EXPLAINATION
The Digital UNIX semctl system call is similar to the OpenVMS
SYS$READEF system service in that they both allow a process to check a
process synchronization set. The semctl function can be called with
the command argument set to GETVAL to retrieve a semaphore value from a
semaphore set. The semctl system call also allows the calling program
to read all the semaphore values in a set if the GETALL command is
used. Note that the values are returned in the "array" field of the
semun union passed as the fourth argument.
RELATED INFORMATION
Digital UNIX Functions:
semop(2), semget(2), semctl(2) delim off
SYS$READEF (OpenVMS)
