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/rmlock.h

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    1 /*-
    2  * Copyright (c) 2007 Stephan Uphoff <ups@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  * 3. Neither the name of the author nor the names of any co-contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/10.0/sys/sys/rmlock.h 252209 2013-06-25 18:44:15Z jhb $
   30  */
   31 
   32 #ifndef _SYS_RMLOCK_H_
   33 #define _SYS_RMLOCK_H_
   34 
   35 #include <sys/mutex.h>
   36 #include <sys/sx.h>
   37 #include <sys/_lock.h>
   38 #include <sys/_rmlock.h>
   39 
   40 #ifdef _KERNEL
   41 
   42 /*
   43  * Flags passed to rm_init_flags(9).
   44  */
   45 #define RM_NOWITNESS    0x00000001
   46 #define RM_RECURSE      0x00000002
   47 #define RM_SLEEPABLE    0x00000004
   48 
   49 void    rm_init(struct rmlock *rm, const char *name);
   50 void    rm_init_flags(struct rmlock *rm, const char *name, int opts);
   51 void    rm_destroy(struct rmlock *rm);
   52 int     rm_wowned(const struct rmlock *rm);
   53 void    rm_sysinit(void *arg);
   54 void    rm_sysinit_flags(void *arg);
   55 
   56 void    _rm_wlock_debug(struct rmlock *rm, const char *file, int line);
   57 void    _rm_wunlock_debug(struct rmlock *rm, const char *file, int line);
   58 int     _rm_rlock_debug(struct rmlock *rm, struct rm_priotracker *tracker,
   59             int trylock, const char *file, int line);
   60 void    _rm_runlock_debug(struct rmlock *rm,  struct rm_priotracker *tracker,
   61             const char *file, int line);
   62 
   63 void    _rm_wlock(struct rmlock *rm);
   64 void    _rm_wunlock(struct rmlock *rm);
   65 int     _rm_rlock(struct rmlock *rm, struct rm_priotracker *tracker,
   66             int trylock);
   67 void    _rm_runlock(struct rmlock *rm,  struct rm_priotracker *tracker);
   68 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
   69 void    _rm_assert(const struct rmlock *rm, int what, const char *file,
   70             int line);
   71 #endif
   72 
   73 /*
   74  * Public interface for lock operations.
   75  */
   76 #ifndef LOCK_DEBUG
   77 #error LOCK_DEBUG not defined, include <sys/lock.h> before <sys/rmlock.h>
   78 #endif
   79 
   80 #if LOCK_DEBUG > 0
   81 #define rm_wlock(rm)    _rm_wlock_debug((rm), LOCK_FILE, LOCK_LINE)
   82 #define rm_wunlock(rm)  _rm_wunlock_debug((rm), LOCK_FILE, LOCK_LINE)
   83 #define rm_rlock(rm,tracker)  \
   84     ((void)_rm_rlock_debug((rm),(tracker), 0, LOCK_FILE, LOCK_LINE ))
   85 #define rm_try_rlock(rm,tracker)  \
   86     _rm_rlock_debug((rm),(tracker), 1, LOCK_FILE, LOCK_LINE )
   87 #define rm_runlock(rm,tracker)  \
   88     _rm_runlock_debug((rm), (tracker), LOCK_FILE, LOCK_LINE )
   89 #else
   90 #define rm_wlock(rm)                    _rm_wlock((rm))
   91 #define rm_wunlock(rm)                  _rm_wunlock((rm))
   92 #define rm_rlock(rm,tracker)            ((void)_rm_rlock((rm),(tracker), 0))
   93 #define rm_try_rlock(rm,tracker)        _rm_rlock((rm),(tracker), 1)
   94 #define rm_runlock(rm,tracker)          _rm_runlock((rm), (tracker))
   95 #endif
   96 #define rm_sleep(chan, rm, pri, wmesg, timo)                            \
   97         _sleep((chan), &(rm)->lock_object, (pri), (wmesg),              \
   98             tick_sbt * (timo), 0, C_HARDCLOCK)
   99 
  100 struct rm_args {
  101         struct rmlock   *ra_rm;
  102         const char      *ra_desc;
  103 };
  104 
  105 struct rm_args_flags {
  106         struct rmlock   *ra_rm;
  107         const char      *ra_desc;
  108         int             ra_opts;
  109 };
  110 
  111 #define RM_SYSINIT(name, rm, desc)                                      \
  112         static struct rm_args name##_args = {                           \
  113                 (rm),                                                   \
  114                 (desc),                                                 \
  115         };                                                              \
  116         SYSINIT(name##_rm_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE,        \
  117             rm_sysinit, &name##_args);                                  \
  118         SYSUNINIT(name##_rm_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE,    \
  119             rm_destroy, (rm))
  120 
  121 
  122 #define RM_SYSINIT_FLAGS(name, rm, desc, opts)                          \
  123         static struct rm_args name##_args = {                           \
  124                 (rm),                                                   \
  125                 (desc),                                                 \
  126                 (opts),                                                 \
  127         };                                                              \
  128         SYSINIT(name##_rm_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE,        \
  129             rm_sysinit_flags, &name##_args);                            \
  130         SYSUNINIT(name##_rm_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE,    \
  131             rm_destroy, (rm))
  132 
  133 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
  134 #define RA_LOCKED               LA_LOCKED
  135 #define RA_RLOCKED              LA_SLOCKED
  136 #define RA_WLOCKED              LA_XLOCKED
  137 #define RA_UNLOCKED             LA_UNLOCKED
  138 #define RA_RECURSED             LA_RECURSED
  139 #define RA_NOTRECURSED          LA_NOTRECURSED
  140 #endif
  141 
  142 #ifdef INVARIANTS
  143 #define rm_assert(rm, what)     _rm_assert((rm), (what), LOCK_FILE, LOCK_LINE)
  144 #else
  145 #define rm_assert(rm, what)
  146 #endif
  147 
  148 #endif /* _KERNEL */
  149 #endif /* !_SYS_RMLOCK_H_ */

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