| #ifndef _LINUX_SEM_H |
| #define _LINUX_SEM_H |
| #include <linux/ipc.h> |
| |
| /* semop flags */ |
| #define SEM_UNDO 010000 /* undo the operation on exit */ |
| |
| /* semctl Command Definitions. */ |
| #define GETPID 11 /* get sempid */ |
| #define GETVAL 12 /* get semval */ |
| #define GETALL 13 /* get all semval's */ |
| #define GETNCNT 14 /* get semncnt */ |
| #define GETZCNT 15 /* get semzcnt */ |
| #define SETVAL 16 /* set semval */ |
| #define SETALL 17 /* set all semval's */ |
| |
| /* One semid data structure for each set of semaphores in the system. */ |
| struct semid_ds { |
| struct ipc_perm sem_perm; /* permissions .. see ipc.h */ |
| time_t sem_otime; /* last semop time */ |
| time_t sem_ctime; /* last change time */ |
| struct sem *sem_base; /* ptr to first semaphore in array */ |
| struct wait_queue *eventn; |
| struct wait_queue *eventz; |
| struct sem_undo *undo; /* undo requests on this array */ |
| ushort sem_nsems; /* no. of semaphores in array */ |
| }; |
| |
| |
| /* One semaphore structure for each semaphore in the system. */ |
| struct sem { |
| short sempid; /* pid of last operation */ |
| ushort semval; /* current value */ |
| ushort semncnt; /* num procs awaiting increase in semval */ |
| ushort semzcnt; /* num procs awaiting semval = 0 */ |
| }; |
| |
| /* semop system calls takes an array of these.*/ |
| struct sembuf { |
| ushort sem_num; /* semaphore index in array */ |
| short sem_op; /* semaphore operation */ |
| short sem_flg; /* operation flags */ |
| }; |
| |
| /* arg for semctl system calls. */ |
| union semun { |
| int val; /* value for SETVAL */ |
| struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ |
| ushort *array; /* array for GETALL & SETALL */ |
| }; |
| |
| |
| struct seminfo { |
| int semmap; |
| int semmni; |
| int semmns; |
| int semmnu; |
| int semmsl; |
| int semopm; |
| int semume; |
| int semusz; |
| int semvmx; |
| int semaem; |
| }; |
| |
| #define SEMMNI 128 /* ? max # of semaphore identifiers */ |
| #define SEMMSL 32 /* <= 512 max num of semaphores per id */ |
| #define SEMMNS (SEMMNI*SEMMSL) /* ? max # of semaphores in system */ |
| #define SEMOPM 32 /* ~ 100 max num of ops per semop call */ |
| #define SEMVMX 32767 /* semaphore maximum value */ |
| |
| /* unused */ |
| #define SEMUME SEMOPM /* max num of undo entries per process */ |
| #define SEMMNU SEMMNS /* num of undo structures system wide */ |
| #define SEMAEM (SEMVMX >> 1) /* adjust on exit max value */ |
| #define SEMMAP SEMMNS /* # of entries in semaphore map */ |
| #define SEMUSZ 20 /* sizeof struct sem_undo */ |
| |
| #ifdef __KERNEL__ |
| /* ipcs ctl cmds */ |
| #define SEM_STAT 18 |
| #define SEM_INFO 19 |
| |
| /* per process undo requests */ |
| /* this gets linked into the task_struct */ |
| struct sem_undo { |
| struct sem_undo *proc_next; |
| struct sem_undo *id_next; |
| int semid; |
| short semadj; /* semval adjusted by exit */ |
| ushort sem_num; /* semaphore index in array semid */ |
| }; |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _LINUX_SEM_H */ |