3d0ea69e61
portable (though the hardwired alignment of 16 would also have worked just
fine and perhaps even resulted in better L1 cache operation).
188 lines
4.9 KiB
C
188 lines
4.9 KiB
C
/* $Id: sem.h,v 1.17 1998/12/14 21:01:47 dillon Exp $ */
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/* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */
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/*
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* SVID compatible sem.h file
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*
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* Author: Daniel Boulet
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*/
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#ifndef _SYS_SEM_H_
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#define _SYS_SEM_H_
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#include <sys/ipc.h>
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struct sem {
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u_short semval; /* semaphore value */
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pid_t sempid; /* pid of last operation */
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u_short semncnt; /* # awaiting semval > cval */
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u_short semzcnt; /* # awaiting semval = 0 */
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};
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struct semid_ds {
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struct ipc_perm sem_perm; /* operation permission struct */
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struct sem *sem_base; /* pointer to first semaphore in set */
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u_short sem_nsems; /* number of sems in set */
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time_t sem_otime; /* last operation time */
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long sem_pad1; /* SVABI/386 says I need this here */
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time_t sem_ctime; /* last change time */
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/* Times measured in secs since */
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/* 00:00:00 GMT, Jan. 1, 1970 */
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long sem_pad2; /* SVABI/386 says I need this here */
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long sem_pad3[4]; /* SVABI/386 says I need this here */
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};
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/*
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* semop's sops parameter structure
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*/
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struct sembuf {
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u_short sem_num; /* semaphore # */
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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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#define SEM_UNDO 010000
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#define MAX_SOPS 5 /* maximum # of sembuf's per semop call */
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/*
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* semctl's arg parameter structure
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*/
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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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u_short *array; /* array for GETALL & SETALL */
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};
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/*
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* commands for semctl
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*/
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#define GETNCNT 3 /* Return the value of semncnt {READ} */
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#define GETPID 4 /* Return the value of sempid {READ} */
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#define GETVAL 5 /* Return the value of semval {READ} */
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#define GETALL 6 /* Return semvals into arg.array {READ} */
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#define GETZCNT 7 /* Return the value of semzcnt {READ} */
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#define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
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#define SETALL 9 /* Set semvals from arg.array {ALTER} */
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/*
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* Permissions
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*/
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#define SEM_A 0200 /* alter permission */
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#define SEM_R 0400 /* read permission */
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#ifdef KERNEL
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/*
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* Kernel implementation stuff
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*/
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#define SEMVMX 32767 /* semaphore maximum value */
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#define SEMAEM 16384 /* adjust on exit max value */
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/*
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* Undo structure (one per process)
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*/
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struct sem_undo {
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struct sem_undo *un_next; /* ptr to next active undo structure */
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struct proc *un_proc; /* owner of this structure */
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short un_cnt; /* # of active entries */
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struct undo {
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short un_adjval; /* adjust on exit values */
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short un_num; /* semaphore # */
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int un_id; /* semid */
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} un_ent[1]; /* undo entries */
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};
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/*
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* semaphore info struct
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*/
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struct seminfo {
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int semmap, /* # of entries in semaphore map */
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semmni, /* # of semaphore identifiers */
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semmns, /* # of semaphores in system */
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semmnu, /* # of undo structures in system */
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semmsl, /* max # of semaphores per id */
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semopm, /* max # of operations per semop call */
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semume, /* max # of undo entries per process */
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semusz, /* size in bytes of undo structure */
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semvmx, /* semaphore maximum value */
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semaem; /* adjust on exit max value */
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};
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extern struct seminfo seminfo;
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/* internal "mode" bits */
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#define SEM_ALLOC 01000 /* semaphore is allocated */
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#define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
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/*
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* Configuration parameters
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*/
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#ifndef SEMMNI
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#define SEMMNI 10 /* # of semaphore identifiers */
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#endif
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#ifndef SEMMNS
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#define SEMMNS 60 /* # of semaphores in system */
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#endif
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#ifndef SEMUME
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#define SEMUME 10 /* max # of undo entries per process */
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#endif
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#ifndef SEMMNU
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#define SEMMNU 30 /* # of undo structures in system */
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#endif
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/* shouldn't need tuning */
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#ifndef SEMMAP
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#define SEMMAP 30 /* # of entries in semaphore map */
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#endif
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#ifndef SEMMSL
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#define SEMMSL SEMMNS /* max # of semaphores per id */
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#endif
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#ifndef SEMOPM
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#define SEMOPM 100 /* max # of operations per semop call */
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#endif
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/*
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* Due to the way semaphore memory is allocated, we have to ensure that
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* SEMUSZ is properly aligned.
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*/
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#define SEM_ALIGN(bytes) (((bytes) + (sizeof(long) - 1)) & ~(sizeof(long) - 1))
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/* actual size of an undo structure */
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#define SEMUSZ SEM_ALIGN(offsetof(struct sem_undo, un_ent[SEMUME]))
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extern struct semid_ds *sema; /* semaphore id pool */
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extern struct sem *sem; /* semaphore pool */
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extern int *semu; /* undo structure pool */
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/*
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* Macro to find a particular sem_undo vector
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*/
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#define SEMU(ix) ((struct sem_undo *)(((intptr_t)semu)+ix * seminfo.semusz))
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/*
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* Process sem_undo vectors at proc exit.
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*/
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void semexit __P((struct proc *p));
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/*
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* Parameters to the semconfig system call
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*/
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typedef enum {
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SEM_CONFIG_FREEZE, /* Freeze the semaphore facility. */
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SEM_CONFIG_THAW /* Thaw the semaphore facility. */
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} semconfig_ctl_t;
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#endif /* KERNEL */
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#ifndef KERNEL
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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int semsys __P((int, ...));
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int semctl __P((int, int, int, ...));
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int semget __P((key_t, int, int));
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int semop __P((int, struct sembuf *,unsigned));
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__END_DECLS
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#endif /* !KERNEL */
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#endif /* !_SEM_H_ */
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