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  * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/8.3/sys/sys/ksem.h 199583 2009-11-20 15:27:52Z jhb $
   27  */
   28 
   29 #ifndef _POSIX4_KSEM_H_
   30 #define _POSIX4_KSEM_H_
   31 
   32 #ifndef _KERNEL
   33 #error "no user-servicable parts inside"
   34 #endif
   35 
   36 #include <sys/condvar.h>
   37 
   38 struct ksem {
   39         int             ks_ref;         /* number of references */
   40         mode_t          ks_mode;        /* protection bits */
   41         uid_t           ks_uid;         /* creator uid */
   42         gid_t           ks_gid;         /* creator gid */
   43         unsigned int    ks_value;       /* current value */
   44         struct cv       ks_cv;          /* waiters sleep here */
   45         int             ks_waiters;     /* number of waiters */
   46         int             ks_flags;
   47 
   48         /*
   49          * Values maintained solely to make this a better-behaved file
   50          * descriptor for fstat() to run on.
   51          *
   52          * XXX: dubious
   53          */
   54         struct timespec ks_atime;
   55         struct timespec ks_mtime;
   56         struct timespec ks_ctime;
   57         struct timespec ks_birthtime;
   58 
   59         struct label    *ks_label;      /* MAC label */
   60 };
   61 
   62 #define KS_ANONYMOUS    0x0001          /* Anonymous (unnamed) semaphore. */
   63 #define KS_DEAD         0x0002          /* No new waiters allowed. */
   64 
   65 #endif /* !_POSIX4_KSEM_H_ */

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