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 /*      $NetBSD: ksem.h,v 1.15 2019/02/03 03:20:24 thorpej Exp $        */
    2 
    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 
   29 #ifndef _SYS_KSEM_H_
   30 #define _SYS_KSEM_H_
   31 
   32 #include <sys/cdefs.h>
   33 
   34 struct timespec;
   35 
   36 #ifdef _KERNEL
   37 #define KSEM_MAX        128
   38 
   39 typedef struct ksem {
   40         LIST_ENTRY(ksem)        ks_entry;       /* global list entry */
   41         struct proc *           ks_pshared_proc;/* owner of pshared sem */
   42         intptr_t                ks_pshared_id;  /* global id for pshared sem */
   43         kmutex_t                ks_lock;        /* lock on this ksem */
   44         kcondvar_t              ks_cv;          /* condition variable */
   45         u_int                   ks_pshared_fd;  /* fd in owning proc */
   46         u_int                   ks_ref;         /* number of references */
   47         u_int                   ks_value;       /* current value */
   48         u_int                   ks_waiters;     /* number of waiters */
   49         char *                  ks_name;        /* name, if named */
   50         size_t                  ks_namelen;     /* length of name */
   51         int                     ks_flags;       /* for KS_UNLINKED */
   52         mode_t                  ks_mode;        /* protection bits */
   53         uid_t                   ks_uid;         /* creator uid */
   54         gid_t                   ks_gid;         /* creator gid */
   55 } ksem_t;
   56 
   57 int do_ksem_init(struct lwp *, unsigned int, intptr_t *, copyin_t, copyout_t);
   58 int do_ksem_open(struct lwp *, const char *, int, mode_t, unsigned int,
   59     intptr_t *, copyout_t);
   60 int do_ksem_wait(struct lwp *, intptr_t, bool, struct timespec *);
   61 
   62 extern int      ksem_max;
   63 #endif /* _KERNEL */
   64 
   65 #if defined(_KERNEL) || defined(_LIBC)
   66 #define KSEM_PSHARED            0x50535244U     /* 'PSRD' */
   67 
   68 #define KSEM_MARKER_MASK        0xff000001U
   69 #define KSEM_MARKER_MIN         0x01000001U
   70 #define KSEM_PSHARED_MARKER     0x70000001U     /* 'p' << 24 | 1 */
   71 #endif /* _KERNEL || _LIBC */
   72 
   73 #ifdef _LIBC
   74 __BEGIN_DECLS
   75 int _ksem_close(intptr_t);
   76 int _ksem_destroy(intptr_t);
   77 int _ksem_getvalue(intptr_t, int *);
   78 int _ksem_init(unsigned int, intptr_t *);
   79 int _ksem_open(const char *, int, mode_t, unsigned int, intptr_t *);
   80 int _ksem_post(intptr_t);
   81 int _ksem_timedwait(intptr_t, const struct timespec * __restrict);
   82 int _ksem_trywait(intptr_t);
   83 int _ksem_unlink(const char *);
   84 int _ksem_wait(intptr_t);
   85 __END_DECLS
   86 #endif /* _LIBC */
   87 
   88 #endif /* _SYS_KSEM_H_ */

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