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  * $FreeBSD$
   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 #include <sys/queue.h>
   38 
   39 struct kuser {
   40         pid_t ku_pid;
   41         LIST_ENTRY(kuser) ku_next;
   42 };
   43 
   44 struct ksem {
   45         LIST_ENTRY(ksem) ks_entry;      /* global list entry */
   46         int ks_onlist;                  /* boolean if on a list (ks_entry) */
   47         char *ks_name;                  /* if named, this is the name */
   48         int ks_ref;                     /* number of references */
   49         mode_t ks_mode;                 /* protection bits */
   50         uid_t ks_uid;                   /* creator uid */
   51         gid_t ks_gid;                   /* creator gid */
   52         unsigned int ks_value;          /* current value */
   53         struct cv ks_cv;                /* waiters sleep here */
   54         int ks_waiters;                 /* number of waiters */
   55         LIST_HEAD(, kuser) ks_users;    /* pids using this sem */
   56         struct label *ks_label;         /* MAC label */
   57 };
   58 
   59 #endif /* !_POSIX4_KSEM_H_ */

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