sl@0: /* $FreeBSD: src/sys/sys/sem.h,v 1.29 2004/11/17 13:12:06 rwatson Exp $ */
sl@0: /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */
sl@0:
sl@0: /*
sl@0: *© * © * Portions Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
sl@0: * SVID compatible sem.h file
sl@0: *
sl@0: * Author: Daniel Boulet
sl@0: */
sl@0:
sl@0: #ifndef _SYS_SEM_H_
sl@0: #define _SYS_SEM_H_
sl@0:
sl@0: #include <sys/ipc.h>
sl@0:
sl@0:
sl@0: struct sem {
sl@0: u_short semval; /* semaphore value */
sl@0: pid_t sempid; /* process ID of last operation */
sl@0: u_short semncnt; /* number of processes waiting for semval
sl@0: to become greater than current value */
sl@0: u_short semzcnt; /* number of processes waiting for semval
sl@0: to become 0 */
sl@0: };
sl@0:
sl@0: struct semid_ds {
sl@0: struct ipc_perm sem_perm; /* operation permission struct */
sl@0: struct sem *sem_base; /* pointer to first semaphore in set */
sl@0: unsigned short sem_nsems; /* number of sems in set */
sl@0: time_t sem_otime; /* last operation time */
sl@0: long sem_pad1; /* SVABI/386 says I need this here */
sl@0: time_t sem_ctime; /* last change time */
sl@0: /* Times measured in secs since */
sl@0: /* 00:00:00 GMT, Jan. 1, 1970 */
sl@0: long sem_pad2; /* SVABI/386 says I need this here */
sl@0: long sem_pad3[4]; /* SVABI/386 says I need this here */
sl@0: };
sl@0:
sl@0: /*
sl@0: * semop's sops parameter structure
sl@0: */
sl@0: struct sembuf {
sl@0: unsigned short sem_num; /* semaphore # */
sl@0: short sem_op; /* semaphore operation */
sl@0: short sem_flg; /* operation flags */
sl@0: };
sl@0: #define SEM_UNDO 010000
sl@0:
sl@0: /*
sl@0: * semctl's arg parameter structure
sl@0: */
sl@0: union semun {
sl@0: int val; /* value for SETVAL */
sl@0: struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
sl@0: unsigned short *array; /* array for GETALL & SETALL */
sl@0: };
sl@0:
sl@0: /*
sl@0: * commands for semctl
sl@0: */
sl@0: #define GETNCNT 3 /* Return the value of semncnt {READ} */
sl@0: #define GETPID 4 /* Return the value of sempid {READ} */
sl@0: #define GETVAL 5 /* Return the value of semval {READ} */
sl@0: #define GETALL 6 /* Return semvals into arg.array {READ} */
sl@0: #define GETZCNT 7 /* Return the value of semzcnt {READ} */
sl@0: #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
sl@0: #define SETALL 9 /* Set semvals from arg.array {ALTER} */
sl@0: #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */
sl@0: #define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */
sl@0:
sl@0: /*
sl@0: * Permissions
sl@0: */
sl@0: #define SEM_A IPC_W /* alter permission */
sl@0: #define SEM_R IPC_R /* read permission */
sl@0:
sl@0: #ifdef _KERNEL
sl@0:
sl@0: /*
sl@0: * semaphore info struct
sl@0: */
sl@0: struct seminfo {
sl@0: int semmap, /* # of entries in semaphore map */
sl@0: semmni, /* # of semaphore identifiers */
sl@0: semmns, /* # of semaphores in system */
sl@0: semmnu, /* # of undo structures in system */
sl@0: semmsl, /* max # of semaphores per id */
sl@0: semopm, /* max # of operations per semop call */
sl@0: semume, /* max # of undo entries per process */
sl@0: semusz, /* size in bytes of undo structure */
sl@0: semvmx, /* semaphore maximum value */
sl@0: semaem; /* adjust on exit max value */
sl@0: };
sl@0: extern struct seminfo seminfo;
sl@0:
sl@0: /*
sl@0: * Kernel wrapper for the user-level structure
sl@0: */
sl@0: struct semid_kernel {
sl@0: struct semid_ds u;
sl@0: struct label *label; /* MAC framework label */
sl@0: };
sl@0:
sl@0: /* internal "mode" bits */
sl@0: #define SEM_ALLOC 01000 /* semaphore is allocated */
sl@0: #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
sl@0:
sl@0: /*
sl@0: * Process sem_undo vectors at proc exit.
sl@0: */
sl@0: void semexit(struct proc *p);
sl@0: #endif /* _KERNEL */
sl@0:
sl@0: #ifndef _KERNEL
sl@0: #include <sys/cdefs.h>
sl@0: #include <sys/_types.h>
sl@0:
sl@0: #ifndef _SIZE_T_DECLARED
sl@0: typedef __size_t size_t;
sl@0: #define _SIZE_T_DECLARED
sl@0: #endif
sl@0:
sl@0: #ifndef _PID_T_DECLARED
sl@0: typedef __pid_t pid_t;
sl@0: #define _PID_T_DECLARED
sl@0: #endif
sl@0:
sl@0: // FUNCTION PROTOTYPES
sl@0:
sl@0:
sl@0: // FORWARD DECLARATIONS
sl@0:
sl@0:
sl@0: // CLASS/STRUCT/FUNCTION DECLARATION
sl@0:
sl@0: __BEGIN_DECLS
sl@0:
sl@0: /*
sl@0: * Get semaphore identifier using the IPC key generated by ftok.
sl@0: */
sl@0:
sl@0: IMPORT_C int semget(key_t key, int nsems, int semflg);
sl@0:
sl@0:
sl@0: /*
sl@0: * Perform atomically a user-defined array of semaphore operations on the set of
sl@0: * semaphores associated with the semaphore identifier specified by the argument semid.
sl@0: */
sl@0:
sl@0: IMPORT_C int semop(int semid, struct sembuf *sops, unsigned nsops);
sl@0:
sl@0:
sl@0: /*
sl@0: * Provides a variety of semaphore control operations as specified by cmd.
sl@0: */
sl@0: IMPORT_C int semctl(int semid, int semnum, int cmd, ...);
sl@0:
sl@0:
sl@0: __END_DECLS
sl@0: #endif // #ifndef _KERNEL
sl@0:
sl@0: #endif // _SYS_SEM_H_
sl@0:
sl@0: // End of File