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  * $FreeBSD$
   30  */
   31 
   32 #ifndef _SYS_RMLOCK_H_
   33 #define _SYS_RMLOCK_H_
   34 
   35 #include <sys/mutex.h>
   36 #include <sys/_lock.h>
   37 #include <sys/_rmlock.h>
   38 
   39 #ifdef _KERNEL
   40 
   41 /*
   42  * Flags passed to rm_init(9).
   43  */
   44 #define RM_NOWITNESS    0x00000001
   45 #define RM_RECURSE      0x00000002
   46 
   47 void    rm_init(struct rmlock *rm, const char *name);
   48 void    rm_init_flags(struct rmlock *rm, const char *name, int opts);
   49 void    rm_destroy(struct rmlock *rm);
   50 int     rm_wowned(struct rmlock *rm);
   51 void    rm_sysinit(void *arg);
   52 void    rm_sysinit_flags(void *arg);
   53 
   54 void    _rm_wlock_debug(struct rmlock *rm, const char *file, int line);
   55 void    _rm_wunlock_debug(struct rmlock *rm, const char *file, int line);
   56 void    _rm_rlock_debug(struct rmlock *rm, struct rm_priotracker *tracker,
   57             const char *file, int line);
   58 void    _rm_runlock_debug(struct rmlock *rm,  struct rm_priotracker *tracker,
   59             const char *file, int line);
   60 
   61 void    _rm_wlock(struct rmlock *rm);
   62 void    _rm_wunlock(struct rmlock *rm);
   63 void    _rm_rlock(struct rmlock *rm, struct rm_priotracker *tracker);
   64 void    _rm_runlock(struct rmlock *rm,  struct rm_priotracker *tracker);
   65 
   66 /*
   67  * Public interface for lock operations.
   68  */
   69 #ifndef LOCK_DEBUG
   70 #error LOCK_DEBUG not defined, include <sys/lock.h> before <sys/rmlock.h>
   71 #endif
   72 
   73 #if LOCK_DEBUG > 0
   74 #define rm_wlock(rm)    _rm_wlock_debug((rm), LOCK_FILE, LOCK_LINE)
   75 #define rm_wunlock(rm)  _rm_wunlock_debug((rm), LOCK_FILE, LOCK_LINE)
   76 #define rm_rlock(rm,tracker)  \
   77     _rm_rlock_debug((rm),(tracker), LOCK_FILE, LOCK_LINE )
   78 #define rm_runlock(rm,tracker)  \
   79     _rm_runlock_debug((rm), (tracker), LOCK_FILE, LOCK_LINE )
   80 #else
   81 #define rm_wlock(rm)            _rm_wlock((rm))
   82 #define rm_wunlock(rm)          _rm_wunlock((rm))
   83 #define rm_rlock(rm,tracker)    _rm_rlock((rm),(tracker))
   84 #define rm_runlock(rm,tracker)  _rm_runlock((rm), (tracker))
   85 #endif
   86 
   87 struct rm_args {
   88         struct rmlock   *ra_rm;
   89         const char      *ra_desc;
   90 };
   91 
   92 struct rm_args_flags {
   93         struct rmlock   *ra_rm;
   94         const char      *ra_desc;
   95         int             ra_opts;
   96 };
   97 
   98 #define RM_SYSINIT(name, rm, desc)                                      \
   99         static struct rm_args name##_args = {                           \
  100                 (rm),                                                   \
  101                 (desc),                                                 \
  102         };                                                              \
  103         SYSINIT(name##_rm_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE,        \
  104             rm_sysinit, &name##_args);                                  \
  105         SYSUNINIT(name##_rm_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE,    \
  106             rm_destroy, (rm))
  107 
  108 
  109 #define RM_SYSINIT_FLAGS(name, rm, desc, opts)                          \
  110         static struct rm_args name##_args = {                           \
  111                 (rm),                                                   \
  112                 (desc),                                                 \
  113                 (opts),                                                 \
  114         };                                                              \
  115         SYSINIT(name##_rm_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE,        \
  116             rm_sysinit_flags, &name##_args);                            \
  117         SYSUNINIT(name##_rm_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE,    \
  118             rm_destroy, (rm))
  119 
  120 #endif /* _KERNEL */
  121 #endif /* !_SYS_RMLOCK_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/sys/rmlock.h

FreeBSD/Linux Kernel Cross Reference
sys/sys/rmlock.h