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/sx.h

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    1 /*-
    2  * Copyright (C) 2001 Jason Evans <jasone@freebsd.org>.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice(s), this list of conditions and the following disclaimer as
    9  *    the first lines of this file unmodified other than the possible 
   10  *    addition of one or more copyright notices.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice(s), this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
   16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   18  * DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
   19  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   22  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
   25  * DAMAGE.
   26  *
   27  * $FreeBSD$
   28  */
   29 
   30 #ifndef _SYS_SX_H_
   31 #define _SYS_SX_H_
   32 
   33 #include <sys/queue.h>
   34 #include <sys/_lock.h>
   35 #include <sys/condvar.h>        /* XXX */
   36 
   37 struct sx {
   38         struct lock_object sx_object;   /* Common lock properties. */
   39         struct mtx      *sx_lock;       /* General protection lock. */
   40         int             sx_cnt;         /* -1: xlock, > 0: slock count. */
   41         struct cv       sx_shrd_cv;     /* slock waiters. */
   42         int             sx_shrd_wcnt;   /* Number of slock waiters. */
   43         struct cv       sx_excl_cv;     /* xlock waiters. */
   44         int             sx_excl_wcnt;   /* Number of xlock waiters. */
   45         struct thread   *sx_xholder;    /* Thread presently holding xlock. */
   46 };
   47 
   48 #ifdef _KERNEL
   49 void    sx_sysinit(void *arg);
   50 void    sx_init(struct sx *sx, const char *description);
   51 void    sx_destroy(struct sx *sx);
   52 void    _sx_slock(struct sx *sx, const char *file, int line);
   53 void    _sx_xlock(struct sx *sx, const char *file, int line);
   54 int     _sx_try_slock(struct sx *sx, const char *file, int line);
   55 int     _sx_try_xlock(struct sx *sx, const char *file, int line);
   56 void    _sx_sunlock(struct sx *sx, const char *file, int line);
   57 void    _sx_xunlock(struct sx *sx, const char *file, int line);
   58 int     _sx_try_upgrade(struct sx *sx, const char *file, int line);
   59 void    _sx_downgrade(struct sx *sx, const char *file, int line);
   60 #ifdef INVARIANT_SUPPORT
   61 void    _sx_assert(struct sx *sx, int what, const char *file, int line);
   62 #endif
   63 
   64 struct sx_args {
   65         struct sx       *sa_sx;
   66         const char      *sa_desc;
   67 };
   68 
   69 #define SX_SYSINIT(name, sxa, desc)                                     \
   70         static struct sx_args name##_args = {                           \
   71                 sxa,                                                    \
   72                 desc                                                    \
   73         };                                                              \
   74         SYSINIT(name##_sx_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE,        \
   75             sx_sysinit, &name##_args)
   76 
   77 #define sx_slock(sx)            _sx_slock((sx), LOCK_FILE, LOCK_LINE)
   78 #define sx_xlock(sx)            _sx_xlock((sx), LOCK_FILE, LOCK_LINE)
   79 #define sx_try_slock(sx)        _sx_try_slock((sx), LOCK_FILE, LOCK_LINE)
   80 #define sx_try_xlock(sx)        _sx_try_xlock((sx), LOCK_FILE, LOCK_LINE)
   81 #define sx_sunlock(sx)          _sx_sunlock((sx), LOCK_FILE, LOCK_LINE)
   82 #define sx_xunlock(sx)          _sx_xunlock((sx), LOCK_FILE, LOCK_LINE)
   83 #define sx_try_upgrade(sx)      _sx_try_upgrade((sx), LOCK_FILE, LOCK_LINE)
   84 #define sx_downgrade(sx)        _sx_downgrade((sx), LOCK_FILE, LOCK_LINE)
   85 #define sx_unlock(sx)   \
   86                 do { \
   87                         if ((sx)->sx_cnt < 0) \
   88                                 sx_xunlock(sx); \
   89                         else \
   90                                 sx_sunlock(sx); \
   91                 } while (0)
   92 
   93 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
   94 #define SX_LOCKED               LA_LOCKED
   95 #define SX_SLOCKED              LA_SLOCKED
   96 #define SX_XLOCKED              LA_XLOCKED
   97 #define SX_UNLOCKED             LA_UNLOCKED
   98 #endif
   99 
  100 #ifdef INVARIANTS
  101 #define sx_assert(sx, what)     _sx_assert((sx), (what), LOCK_FILE, LOCK_LINE)
  102 #else
  103 #define sx_assert(sx, what)
  104 #endif
  105 
  106 #endif /* _KERNEL */
  107 
  108 #endif /* !_SYS_SX_H_ */

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