The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/sem.h

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    1 /*      $NetBSD: sem.h,v 1.16 2003/06/29 22:32:28 fvdl Exp $    */
    2 
    3 /*-
    4  * Copyright (c) 1999 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
    9  * NASA Ames Research Center.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed by the NetBSD
   22  *      Foundation, Inc. and its contributors.
   23  * 4. Neither the name of The NetBSD Foundation nor the names of its
   24  *    contributors may be used to endorse or promote products derived
   25  *    from this software without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   37  * POSSIBILITY OF SUCH DAMAGE.
   38  */
   39 
   40 /*
   41  * SVID compatible sem.h file
   42  *
   43  * Author: Daniel Boulet
   44  */
   45 
   46 #ifndef _SYS_SEM_H_
   47 #define _SYS_SEM_H_
   48 
   49 #include <sys/featuretest.h>
   50 
   51 #include <sys/ipc.h>
   52 
   53 #ifdef _KERNEL
   54 struct __sem {
   55         unsigned short  semval;         /* semaphore value */
   56         pid_t           sempid;         /* pid of last operation */
   57         unsigned short  semncnt;        /* # awaiting semval > cval */
   58         unsigned short  semzcnt;        /* # awaiting semval = 0 */
   59 };
   60 #endif /* _KERNEL */
   61 
   62 struct semid_ds {
   63         struct ipc_perm sem_perm;       /* operation permission structure */
   64         unsigned short  sem_nsems;      /* number of semaphores in set */
   65         time_t          sem_otime;      /* last semop() time */
   66         time_t          sem_ctime;      /* last time changed by semctl() */
   67 
   68         /*
   69          * These members are private and used only in the internal
   70          * implementation of this interface.
   71          */
   72         struct __sem    *_sem_base;     /* pointer to first semaphore in set */
   73 };
   74 
   75 #ifdef _KERNEL
   76 struct semid_ds14 {
   77         struct ipc_perm14 sem_perm;     /* operation permission struct */
   78         struct __sem    *sem_base;      /* pointer to first semaphore in set */
   79         unsigned short  sem_nsems;      /* number of sems in set */
   80         time_t          sem_otime;      /* last operation time */
   81         long            sem_pad1;       /* SVABI/386 says I need this here */
   82         time_t          sem_ctime;      /* last change time */
   83                                         /* Times measured in secs since */
   84                                         /* 00:00:00 GMT, Jan. 1, 1970 */
   85         long            sem_pad2;       /* SVABI/386 says I need this here */
   86         long            sem_pad3[4];    /* SVABI/386 says I need this here */
   87 };
   88 #endif /* _KERNEL */
   89 
   90 /*
   91  * semop's sops parameter structure
   92  */
   93 struct sembuf {
   94         unsigned short  sem_num;        /* semaphore # */
   95         short           sem_op;         /* semaphore operation */
   96         short           sem_flg;        /* operation flags */
   97 };
   98 #define SEM_UNDO        010000          /* undo changes on process exit */
   99 
  100 /*
  101  * commands for semctl
  102  */
  103 #define GETNCNT 3       /* Return the value of semncnt {READ} */
  104 #define GETPID  4       /* Return the value of sempid {READ} */
  105 #define GETVAL  5       /* Return the value of semval {READ} */
  106 #define GETALL  6       /* Return semvals into arg.array {READ} */
  107 #define GETZCNT 7       /* Return the value of semzcnt {READ} */
  108 #define SETVAL  8       /* Set the value of semval to arg.val {ALTER} */
  109 #define SETALL  9       /* Set semvals from arg.array {ALTER} */
  110 
  111 #ifdef _KERNEL
  112 /*
  113  * Kernel implementation stuff
  114  */
  115 #define SEMVMX  32767           /* semaphore maximum value */
  116 #define SEMAEM  16384           /* adjust on exit max value */
  117 
  118 #define MAX_SOPS        5       /* maximum # of sembuf's per semop call */
  119 
  120 /*
  121  * Permissions
  122  */
  123 #define SEM_A           0200    /* alter permission */
  124 #define SEM_R           0400    /* read permission */
  125 
  126 /*
  127  * Undo structure (one per process)
  128  */
  129 struct sem_undo {
  130         struct  sem_undo *un_next;      /* ptr to next active undo structure */
  131         struct  proc *un_proc;          /* owner of this structure */
  132         short   un_cnt;                 /* # of active entries */
  133         struct undo {
  134                 short   un_adjval;      /* adjust on exit values */
  135                 short   un_num;         /* semaphore # */
  136                 int     un_id;          /* semid */
  137         } un_ent[1];                    /* undo entries */
  138 };
  139 #endif /* _KERNEL */
  140 
  141 #if defined(_NETBSD_SOURCE)
  142 /*
  143  * semaphore info struct
  144  */
  145 struct seminfo {
  146         int32_t semmap;         /* # of entries in semaphore map */
  147         int32_t semmni;         /* # of semaphore identifiers */
  148         int32_t semmns;         /* # of semaphores in system */
  149         int32_t semmnu;         /* # of undo structures in system */
  150         int32_t semmsl;         /* max # of semaphores per id */
  151         int32_t semopm;         /* max # of operations per semop call */
  152         int32_t semume;         /* max # of undo entries per process */
  153         int32_t semusz;         /* size in bytes of undo structure */
  154         int32_t semvmx;         /* semaphore maximum value */
  155         int32_t semaem;         /* adjust on exit max value */
  156 };
  157 
  158 /* Warning: 64-bit structure padding is needed here */
  159 struct semid_ds_sysctl {
  160         struct  ipc_perm_sysctl sem_perm;
  161         int16_t sem_nsems;
  162         int16_t pad2;
  163         int32_t pad3;
  164         time_t  sem_otime;
  165         time_t  sem_ctime;
  166 };
  167 struct sem_sysctl_info {
  168         struct  seminfo seminfo;
  169         struct  semid_ds_sysctl semids[1];
  170 };
  171 
  172 /*
  173  * Internal "mode" bits.  The first of these is used by ipcs(1), and so
  174  * is defined outside the kernel as well.
  175  */
  176 #define SEM_ALLOC       01000   /* semaphore is allocated */
  177 #endif /* !_POSIX_C_SOURCE && !_XOPEN_SOURCE */
  178 
  179 #ifdef _KERNEL
  180 #define SEM_DEST        02000   /* semaphore will be destroyed on last detach */
  181 
  182 /*
  183  * Configuration parameters
  184  */
  185 #ifndef SEMMNI
  186 #define SEMMNI  10              /* # of semaphore identifiers */
  187 #endif
  188 #ifndef SEMMNS
  189 #define SEMMNS  60              /* # of semaphores in system */
  190 #endif
  191 #ifndef SEMUME
  192 #define SEMUME  10              /* max # of undo entries per process */
  193 #endif
  194 #ifndef SEMMNU
  195 #define SEMMNU  30              /* # of undo structures in system */
  196 #endif
  197 
  198 /* shouldn't need tuning */
  199 #ifndef SEMMAP
  200 #define SEMMAP  30              /* # of entries in semaphore map */
  201 #endif
  202 #ifndef SEMMSL
  203 #define SEMMSL  SEMMNS          /* max # of semaphores per id */
  204 #endif
  205 #ifndef SEMOPM
  206 #define SEMOPM  100             /* max # of operations per semop call */
  207 #endif
  208 
  209 /* actual size of an undo structure */
  210 #define SEMUSZ  (sizeof(struct sem_undo)+sizeof(struct undo)*SEMUME)
  211 
  212 /*
  213  * Structures allocated in machdep.c
  214  */
  215 extern struct seminfo seminfo;
  216 extern struct semid_ds *sema;           /* semaphore id pool */
  217 extern struct __sem *sem;               /* semaphore pool */
  218 extern struct map *semmap;              /* semaphore allocation map */
  219 extern struct sem_undo *semu_list;      /* list of active undo structures */
  220 extern int *semu;                       /* undo structure pool */
  221 
  222 /*
  223  * Macro to find a particular sem_undo vector
  224  */
  225 #define SEMU(ix)        ((struct sem_undo *)(((long)semu)+ix * SEMUSZ))
  226 
  227 /*
  228  * Parameters to the semconfig system call
  229  */
  230 #define SEM_CONFIG_FREEZE       0       /* Freeze the semaphore facility. */
  231 #define SEM_CONFIG_THAW         1       /* Thaw the semaphore facility. */
  232 #endif /* _KERNEL */
  233 
  234 #ifndef _KERNEL
  235 #include <sys/cdefs.h>
  236 
  237 __BEGIN_DECLS
  238 #if defined(__LIBC12_SOURCE__)
  239 int     semctl __P((int, int, int, union __semun));
  240 int     __semctl __P((int, int, int, union __semun *));
  241 int     __semctl13 __P((int, int, int, ...));
  242 #else
  243 int     semctl __P((int, int, int, ...)) __RENAME(__semctl13);
  244 #endif
  245 int     semget __P((key_t, int, int));
  246 int     semop __P((int, struct sembuf *, size_t));
  247 #if defined(_NETBSD_SOURCE)
  248 int     semconfig __P((int));
  249 #endif
  250 __END_DECLS
  251 #else
  252 void    seminit __P((void));
  253 void    semexit __P((struct proc *, void *));
  254 
  255 int     semctl1 __P((struct proc *, int, int, int, void *, register_t *));
  256 #endif /* !_KERNEL */
  257 
  258 #endif /* !_SEM_H_ */

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