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/ksem.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: stable/12/sys/sys/ksem.h 326256 2017-11-27 15:01:59Z pfg $
   29  */
   30 
   31 #ifndef _POSIX4_KSEM_H_
   32 #define _POSIX4_KSEM_H_
   33 
   34 #if !defined(_KERNEL) && !defined(_WANT_FILE)
   35 #error "no user-serviceable parts inside"
   36 #endif
   37 
   38 #include <sys/condvar.h>
   39 
   40 struct ksem {
   41         int             ks_ref;         /* number of references */
   42         mode_t          ks_mode;        /* protection bits */
   43         uid_t           ks_uid;         /* creator uid */
   44         gid_t           ks_gid;         /* creator gid */
   45         unsigned int    ks_value;       /* current value */
   46         struct cv       ks_cv;          /* waiters sleep here */
   47         int             ks_waiters;     /* number of waiters */
   48         int             ks_flags;
   49 
   50         /*
   51          * Values maintained solely to make this a better-behaved file
   52          * descriptor for fstat() to run on.
   53          *
   54          * XXX: dubious
   55          */
   56         struct timespec ks_atime;
   57         struct timespec ks_mtime;
   58         struct timespec ks_ctime;
   59         struct timespec ks_birthtime;
   60 
   61         struct label    *ks_label;      /* MAC label */
   62         const char      *ks_path;
   63 };
   64 
   65 #define KS_ANONYMOUS    0x0001          /* Anonymous (unnamed) semaphore. */
   66 #define KS_DEAD         0x0002          /* No new waiters allowed. */
   67 
   68 #endif /* !_POSIX4_KSEM_H_ */

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