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