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/* $FreeBSD: src/sys/sys/sem.h,v 1.29 2004/11/17 13:12:06 rwatson 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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*© * © * Portions Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
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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; /* process ID of last operation */
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u_short semncnt; /* number of processes waiting for semval
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to become greater than current value */
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u_short semzcnt; /* number of processes waiting for semval
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to become 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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unsigned 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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unsigned 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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/*
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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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unsigned 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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#define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */
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#define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */
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/*
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* Permissions
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*/
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#define SEM_A IPC_W /* alter permission */
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#define SEM_R IPC_R /* read permission */
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#ifdef _KERNEL
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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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/*
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* Kernel wrapper for the user-level structure
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*/
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struct semid_kernel {
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struct semid_ds u;
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struct label *label; /* MAC framework label */
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};
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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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* Process sem_undo vectors at proc exit.
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*/
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void semexit(struct proc *p);
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#endif /* _KERNEL */
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#ifndef _KERNEL
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#include <sys/cdefs.h>
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#include <sys/_types.h>
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#ifndef _SIZE_T_DECLARED
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typedef __size_t size_t;
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#define _SIZE_T_DECLARED
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#endif
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#ifndef _PID_T_DECLARED
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typedef __pid_t pid_t;
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#define _PID_T_DECLARED
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#endif
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// FUNCTION PROTOTYPES
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// FORWARD DECLARATIONS
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// CLASS/STRUCT/FUNCTION DECLARATION
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__BEGIN_DECLS
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/*
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* Get semaphore identifier using the IPC key generated by ftok.
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*/
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IMPORT_C int semget(key_t key, int nsems, int semflg);
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/*
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* Perform atomically a user-defined array of semaphore operations on the set of
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* semaphores associated with the semaphore identifier specified by the argument semid.
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*/
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IMPORT_C int semop(int semid, struct sembuf *sops, unsigned nsops);
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/*
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* Provides a variety of semaphore control operations as specified by cmd.
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*/
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IMPORT_C int semctl(int semid, int semnum, int cmd, ...);
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__END_DECLS
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#endif // #ifndef _KERNEL
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#endif // _SYS_SEM_H_
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// End of File
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