HP 3000 Manuals

MPE/iX Developer's Kit Reference Manual Volume II

sys/sem.h 

Macros 

SEM_UNDO                  Set up adjust on exit entry
GETNCNT                   Get semncnt
GETPID                    Get sempid
GETVAL                    Get semval
GETALL                    Get all semvals
GETZCNT                   Get semzcnt
SETVAL                    Set semval
SETALL                    Set all semvals

Functions 

If __STDC__ is defined:

     extern int semctl( int, int, int, union semun );
     extern int semget( key_t, int, int );
     extern int semop ( int, struct sembuf *, unsigned int );

If __STDC__ is not defined:

     extern int semctl( );
     extern int semget( );
     extern int semop ( );

Structures 

Semaphore set id data structure:

     struct semid_ds {

        struct ipc_perm   sem_perm;       /* operation permission struct   */
        void              *sem_base;      /* not used on MPE/iX            */
        int               sem_nsems;      /* # of semaphores in set        */
        time_t            sem_otime;      /* last semop time               */
        time_t            sem_ctime;      /* last change time              */

        };

Semaphore semop array element template structure:

     struct sembuf {

        int        sem_num;               /* semaphore #                   */
        int        sem_op;                /* semaphore operation           */
        long       sem_flg;               /* operation flags               */

        };

MPE/iX 5.0 Documentation