The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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 1.27 2008/10/22 11:25:19 ad 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  *
   20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   30  * POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * SVID compatible sem.h file
   35  *
   36  * Author: Daniel Boulet
   37  */
   38 
   39 #ifndef _SYS_SEM_H_
   40 #define _SYS_SEM_H_
   41 
   42 #include <sys/featuretest.h>
   43 
   44 #include <sys/ipc.h>
   45 
   46 #ifdef _KERNEL
   47 struct __sem {
   48         unsigned short  semval;         /* semaphore value */
   49         pid_t           sempid;         /* pid of last operation */
   50         unsigned short  semncnt;        /* # awaiting semval > cval */
   51         unsigned short  semzcnt;        /* # awaiting semval = 0 */
   52 };
   53 #endif /* _KERNEL */
   54 
   55 struct semid_ds {
   56         struct ipc_perm sem_perm;       /* operation permission structure */
   57         unsigned short  sem_nsems;      /* number of semaphores in set */
   58         time_t          sem_otime;      /* last semop() time */
   59         time_t          sem_ctime;      /* last time changed by semctl() */
   60 
   61         /*
   62          * These members are private and used only in the internal
   63          * implementation of this interface.
   64          */
   65         struct __sem    *_sem_base;     /* pointer to first semaphore in set */
   66 };
   67 
   68 /*
   69  * semop's sops parameter structure
   70  */
   71 struct sembuf {
   72         unsigned short  sem_num;        /* semaphore # */
   73         short           sem_op;         /* semaphore operation */
   74         short           sem_flg;        /* operation flags */
   75 };
   76 #define SEM_UNDO        010000          /* undo changes on process exit */
   77 
   78 /*
   79  * commands for semctl
   80  */
   81 #define GETNCNT 3       /* Return the value of semncnt {READ} */
   82 #define GETPID  4       /* Return the value of sempid {READ} */
   83 #define GETVAL  5       /* Return the value of semval {READ} */
   84 #define GETALL  6       /* Return semvals into arg.array {READ} */
   85 #define GETZCNT 7       /* Return the value of semzcnt {READ} */
   86 #define SETVAL  8       /* Set the value of semval to arg.val {ALTER} */
   87 #define SETALL  9       /* Set semvals from arg.array {ALTER} */
   88 
   89 #ifdef _KERNEL
   90 /*
   91  * Kernel implementation stuff
   92  */
   93 #define SEMVMX  32767           /* semaphore maximum value */
   94 #define SEMAEM  16384           /* adjust on exit max value */
   95 
   96 /*
   97  * Permissions
   98  */
   99 #define SEM_A           0200    /* alter permission */
  100 #define SEM_R           0400    /* read permission */
  101 
  102 /*
  103  * Undo structure (one per process)
  104  */
  105 struct sem_undo {
  106         struct  sem_undo *un_next;      /* ptr to next active undo structure */
  107         struct  proc *un_proc;          /* owner of this structure */
  108         short   un_cnt;                 /* # of active entries */
  109         struct undo {
  110                 short   un_adjval;      /* adjust on exit values */
  111                 short   un_num;         /* semaphore # */
  112                 int     un_id;          /* semid */
  113         } un_ent[1];                    /* undo entries */
  114 };
  115 #endif /* _KERNEL */
  116 
  117 #if defined(_NETBSD_SOURCE)
  118 /*
  119  * semaphore info struct
  120  */
  121 struct seminfo {
  122         int32_t semmap;         /* # of entries in semaphore map */
  123         int32_t semmni;         /* # of semaphore identifiers */
  124         int32_t semmns;         /* # of semaphores in system */
  125         int32_t semmnu;         /* # of undo structures in system */
  126         int32_t semmsl;         /* max # of semaphores per id */
  127         int32_t semopm;         /* max # of operations per semop call */
  128         int32_t semume;         /* max # of undo entries per process */
  129         int32_t semusz;         /* size in bytes of undo structure */
  130         int32_t semvmx;         /* semaphore maximum value */
  131         int32_t semaem;         /* adjust on exit max value */
  132 };
  133 
  134 /* Warning: 64-bit structure padding is needed here */
  135 struct semid_ds_sysctl {
  136         struct  ipc_perm_sysctl sem_perm;
  137         int16_t sem_nsems;
  138         int16_t pad2;
  139         int32_t pad3;
  140         time_t  sem_otime;
  141         time_t  sem_ctime;
  142 };
  143 struct sem_sysctl_info {
  144         struct  seminfo seminfo;
  145         struct  semid_ds_sysctl semids[1];
  146 };
  147 
  148 /*
  149  * Internal "mode" bits.  The first of these is used by ipcs(1), and so
  150  * is defined outside the kernel as well.
  151  */
  152 #define SEM_ALLOC       01000   /* semaphore is allocated */
  153 #endif /* !_POSIX_C_SOURCE && !_XOPEN_SOURCE */
  154 
  155 #ifdef _KERNEL
  156 #define SEM_DEST        02000   /* semaphore will be destroyed on last detach */
  157 
  158 /*
  159  * Configuration parameters
  160  */
  161 #ifndef SEMMNI
  162 #define SEMMNI  10              /* # of semaphore identifiers */
  163 #endif
  164 #ifndef SEMMNS
  165 #define SEMMNS  60              /* # of semaphores in system */
  166 #endif
  167 #ifndef SEMUME
  168 #define SEMUME  10              /* max # of undo entries per process */
  169 #endif
  170 #ifndef SEMMNU
  171 #define SEMMNU  30              /* # of undo structures in system */
  172 #endif
  173 
  174 /* shouldn't need tuning */
  175 #ifndef SEMMAP
  176 #define SEMMAP  30              /* # of entries in semaphore map */
  177 #endif
  178 #ifndef SEMMSL
  179 #define SEMMSL  SEMMNS          /* max # of semaphores per id */
  180 #endif
  181 #ifndef SEMOPM
  182 #define SEMOPM  100             /* max # of operations per semop call */
  183 #endif
  184 
  185 /* actual size of an undo structure */
  186 #define SEMUSZ  (sizeof(struct sem_undo)+sizeof(struct undo)*SEMUME)
  187 
  188 /*
  189  * Structures allocated in machdep.c
  190  */
  191 extern struct seminfo seminfo;
  192 extern struct semid_ds *sema;           /* semaphore id pool */
  193 
  194 /*
  195  * Parameters to the semconfig system call
  196  */
  197 #define SEM_CONFIG_FREEZE       0       /* Freeze the semaphore facility. */
  198 #define SEM_CONFIG_THAW         1       /* Thaw the semaphore facility. */
  199 #endif /* _KERNEL */
  200 
  201 #ifndef _KERNEL
  202 #include <sys/cdefs.h>
  203 
  204 __BEGIN_DECLS
  205 #ifndef __LIBC12_SOURCE__
  206 int     semctl(int, int, int, ...) __RENAME(__semctl13);
  207 #endif
  208 int     semget(key_t, int, int);
  209 int     semop(int, struct sembuf *, size_t);
  210 #if defined(_NETBSD_SOURCE)
  211 int     semconfig(int);
  212 #endif
  213 __END_DECLS
  214 #else
  215 void    seminit(void);
  216 void    semexit(struct proc *, void *);
  217 
  218 int     semctl1(struct lwp *, int, int, int, void *, register_t *);
  219 #define get_semctl_arg(cmd, sembuf, arg) \
  220     ((cmd) == IPC_SET || (cmd) == IPC_STAT ? (void *)sembuf \
  221     : (cmd) == GETALL || (cmd) == SETVAL || (cmd) == SETALL ? (void *)arg \
  222     : NULL)
  223 #endif /* !_KERNEL */
  224 
  225 #endif /* !_SYS_SEM_H_ */

Cache object: 35b24a89353ed1b81d8b16afd7387e16


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