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Annotation of XNU/bsd/sys/sem.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*     $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $      */
        !            23: 
        !            24: /*
        !            25:  * SVID compatible sem.h file
        !            26:  *
        !            27:  * Author:  Daniel Boulet
        !            28:  */
        !            29: 
        !            30: #ifndef _SYS_SEM_H_
        !            31: #define _SYS_SEM_H_
        !            32: 
        !            33: #include <sys/ipc.h>
        !            34: 
        !            35: struct sem {
        !            36:        u_short semval;         /* semaphore value */
        !            37:        pid_t   sempid;         /* pid of last operation */
        !            38:        u_short semncnt;        /* # awaiting semval > cval */
        !            39:        u_short semzcnt;        /* # awaiting semval = 0 */
        !            40: };
        !            41: 
        !            42: struct semid_ds {
        !            43:        struct  ipc_perm sem_perm;      /* operation permission struct */
        !            44:        struct  sem *sem_base;  /* pointer to first semaphore in set */
        !            45:        u_short sem_nsems;      /* number of sems in set */
        !            46:        time_t  sem_otime;      /* last operation time */
        !            47:        long    sem_pad1;       /* SVABI/386 says I need this here */
        !            48:        time_t  sem_ctime;      /* last change time */
        !            49:                                /* Times measured in secs since */
        !            50:                                /* 00:00:00 GMT, Jan. 1, 1970 */
        !            51:        long    sem_pad2;       /* SVABI/386 says I need this here */
        !            52:        long    sem_pad3[4];    /* SVABI/386 says I need this here */
        !            53: };
        !            54: 
        !            55: /*
        !            56:  * semop's sops parameter structure
        !            57:  */
        !            58: struct sembuf {
        !            59:        u_short sem_num;        /* semaphore # */
        !            60:        short   sem_op;         /* semaphore operation */
        !            61:        short   sem_flg;        /* operation flags */
        !            62: };
        !            63: #define SEM_UNDO       010000
        !            64: 
        !            65: #define MAX_SOPS       5       /* maximum # of sembuf's per semop call */
        !            66: 
        !            67: /*
        !            68:  * semctl's arg parameter structure
        !            69:  */
        !            70: union semun {
        !            71:        int     val;            /* value for SETVAL */
        !            72:        struct  semid_ds *buf;  /* buffer for IPC_STAT & IPC_SET */
        !            73:        u_short *array;         /* array for GETALL & SETALL */
        !            74: };
        !            75: 
        !            76: /*
        !            77:  * commands for semctl
        !            78:  */
        !            79: #define GETNCNT        3       /* Return the value of semncnt {READ} */
        !            80: #define GETPID 4       /* Return the value of sempid {READ} */
        !            81: #define GETVAL 5       /* Return the value of semval {READ} */
        !            82: #define GETALL 6       /* Return semvals into arg.array {READ} */
        !            83: #define GETZCNT        7       /* Return the value of semzcnt {READ} */
        !            84: #define SETVAL 8       /* Set the value of semval to arg.val {ALTER} */
        !            85: #define SETALL 9       /* Set semvals from arg.array {ALTER} */
        !            86: 
        !            87: /*
        !            88:  * Permissions
        !            89:  */
        !            90: #define SEM_A          0200    /* alter permission */
        !            91: #define SEM_R          0400    /* read permission */
        !            92: 
        !            93: #ifdef KERNEL
        !            94: /*
        !            95:  * Kernel implementation stuff
        !            96:  */
        !            97: #define SEMVMX 32767           /* semaphore maximum value */
        !            98: #define SEMAEM 16384           /* adjust on exit max value */
        !            99: 
        !           100: 
        !           101: /*
        !           102:  * Undo structure (one per process)
        !           103:  */
        !           104: struct sem_undo {
        !           105:        struct  sem_undo *un_next;      /* ptr to next active undo structure */
        !           106:        struct  proc *un_proc;          /* owner of this structure */
        !           107:        short   un_cnt;                 /* # of active entries */
        !           108:        struct undo {
        !           109:                short   un_adjval;      /* adjust on exit values */
        !           110:                short   un_num;         /* semaphore # */
        !           111:                int     un_id;          /* semid */
        !           112:        } un_ent[1];                    /* undo entries */
        !           113: };
        !           114: 
        !           115: /*
        !           116:  * semaphore info struct
        !           117:  */
        !           118: struct seminfo {
        !           119:        int     semmap,         /* # of entries in semaphore map */
        !           120:                semmni,         /* # of semaphore identifiers */
        !           121:                semmns,         /* # of semaphores in system */
        !           122:                semmnu,         /* # of undo structures in system */
        !           123:                semmsl,         /* max # of semaphores per id */
        !           124:                semopm,         /* max # of operations per semop call */
        !           125:                semume,         /* max # of undo entries per process */
        !           126:                semusz,         /* size in bytes of undo structure */
        !           127:                semvmx,         /* semaphore maximum value */
        !           128:                semaem;         /* adjust on exit max value */
        !           129: };
        !           130: extern struct seminfo  seminfo;
        !           131: 
        !           132: /* internal "mode" bits */
        !           133: #define        SEM_ALLOC       01000   /* semaphore is allocated */
        !           134: #define        SEM_DEST        02000   /* semaphore will be destroyed on last detach */
        !           135: 
        !           136: /*
        !           137:  * Configuration parameters
        !           138:  */
        !           139: #ifndef SEMMNI
        !           140: #define SEMMNI 10              /* # of semaphore identifiers */
        !           141: #endif
        !           142: #ifndef SEMMNS
        !           143: #define SEMMNS 60              /* # of semaphores in system */
        !           144: #endif
        !           145: #ifndef SEMUME
        !           146: #define SEMUME 10              /* max # of undo entries per process */
        !           147: #endif
        !           148: #ifndef SEMMNU
        !           149: #define SEMMNU 30              /* # of undo structures in system */
        !           150: #endif
        !           151: 
        !           152: /* shouldn't need tuning */
        !           153: #ifndef SEMMAP
        !           154: #define SEMMAP 30              /* # of entries in semaphore map */
        !           155: #endif
        !           156: #ifndef SEMMSL
        !           157: #define SEMMSL SEMMNS          /* max # of semaphores per id */
        !           158: #endif
        !           159: #ifndef SEMOPM
        !           160: #define SEMOPM 100             /* max # of operations per semop call */
        !           161: #endif
        !           162: 
        !           163: /*
        !           164:  * Due to the way semaphore memory is allocated, we have to ensure that
        !           165:  * SEMUSZ is properly aligned.
        !           166:  */
        !           167: 
        !           168: #define SEM_ALIGN(bytes) (((bytes) + (sizeof(long) - 1)) & ~(sizeof(long) - 1))
        !           169: 
        !           170: /* actual size of an undo structure */
        !           171: #define SEMUSZ SEM_ALIGN(offsetof(struct sem_undo, un_ent[SEMUME]))
        !           172: 
        !           173: extern struct semid_ds *sema;  /* semaphore id pool */
        !           174: extern struct sem *sem;                /* semaphore pool */
        !           175: extern int     *semu;          /* undo structure pool */
        !           176: 
        !           177: /*
        !           178:  * Macro to find a particular sem_undo vector
        !           179:  */
        !           180: #define SEMU(ix)       ((struct sem_undo *)(((intptr_t)semu)+ix * seminfo.semusz))
        !           181: 
        !           182: /*
        !           183:  * Process sem_undo vectors at proc exit.
        !           184:  */
        !           185: void   semexit __P((struct proc *p));
        !           186: 
        !           187: /*
        !           188:  * Parameters to the semconfig system call
        !           189:  */
        !           190: typedef enum {
        !           191:        SEM_CONFIG_FREEZE,      /* Freeze the semaphore facility. */
        !           192:        SEM_CONFIG_THAW         /* Thaw the semaphore facility. */
        !           193: } semconfig_ctl_t;
        !           194: #endif /* KERNEL */
        !           195: 
        !           196: #ifndef KERNEL
        !           197: #include <sys/cdefs.h>
        !           198: 
        !           199: __BEGIN_DECLS
        !           200: int semsys __P((int, ...));
        !           201: int semctl __P((int, int, int, ...));
        !           202: int semget __P((key_t, int, int));
        !           203: int semop __P((int, struct sembuf *,unsigned));
        !           204: __END_DECLS
        !           205: #endif /* !KERNEL */
        !           206: 
        !           207: #endif /* !_SEM_H_ */

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