The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/lockmgr.h

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    1 /*-
    2  * Copyright (c) 2008 Attilio Rao <attilio@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(s), this list of conditions and the following disclaimer as
   10  *    the first lines of this file unmodified other than the possible 
   11  *    addition of one or more copyright notices.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice(s), 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 COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
   17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   19  * DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
   20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   22  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   23  * 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 SUCH
   26  * DAMAGE.
   27  *
   28  * $FreeBSD: releng/10.2/sys/sys/lockmgr.h 274606 2014-11-16 23:02:32Z kib $
   29  */
   30 
   31 #ifndef _SYS_LOCKMGR_H_
   32 #define _SYS_LOCKMGR_H_
   33 
   34 #include <sys/_lock.h>
   35 #include <sys/_lockmgr.h>
   36 #include <sys/_mutex.h>
   37 #include <sys/_rwlock.h>
   38 
   39 #define LK_SHARE                        0x01
   40 #define LK_SHARED_WAITERS               0x02
   41 #define LK_EXCLUSIVE_WAITERS            0x04
   42 #define LK_EXCLUSIVE_SPINNERS           0x08
   43 #define LK_ALL_WAITERS                                                  \
   44         (LK_SHARED_WAITERS | LK_EXCLUSIVE_WAITERS)
   45 #define LK_FLAGMASK                                                     \
   46         (LK_SHARE | LK_ALL_WAITERS | LK_EXCLUSIVE_SPINNERS)
   47 
   48 #define LK_HOLDER(x)                    ((x) & ~LK_FLAGMASK)
   49 #define LK_SHARERS_SHIFT                4
   50 #define LK_SHARERS(x)                   (LK_HOLDER(x) >> LK_SHARERS_SHIFT)
   51 #define LK_SHARERS_LOCK(x)              ((x) << LK_SHARERS_SHIFT | LK_SHARE)
   52 #define LK_ONE_SHARER                   (1 << LK_SHARERS_SHIFT)
   53 #define LK_UNLOCKED                     LK_SHARERS_LOCK(0)
   54 #define LK_KERNPROC                     ((uintptr_t)(-1) & ~LK_FLAGMASK)
   55 
   56 #ifdef _KERNEL
   57 
   58 #if !defined(LOCK_FILE) || !defined(LOCK_LINE)
   59 #error  "LOCK_FILE and LOCK_LINE not defined, include <sys/lock.h> before"
   60 #endif
   61 
   62 struct thread;
   63 #define lk_recurse      lock_object.lo_data
   64 
   65 /*
   66  * Function prototipes.  Routines that start with an underscore are not part
   67  * of the public interface and might be wrappered with a macro.
   68  */
   69 int      __lockmgr_args(struct lock *lk, u_int flags, struct lock_object *ilk,
   70             const char *wmesg, int prio, int timo, const char *file, int line);
   71 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
   72 void     _lockmgr_assert(const struct lock *lk, int what, const char *file, int line);
   73 #endif
   74 void     _lockmgr_disown(struct lock *lk, const char *file, int line);
   75 
   76 void     lockallowrecurse(struct lock *lk);
   77 void     lockallowshare(struct lock *lk);
   78 void     lockdestroy(struct lock *lk);
   79 void     lockdisablerecurse(struct lock *lk);
   80 void     lockdisableshare(struct lock *lk);
   81 void     lockinit(struct lock *lk, int prio, const char *wmesg, int timo,
   82             int flags);
   83 #ifdef DDB
   84 int      lockmgr_chain(struct thread *td, struct thread **ownerp);
   85 #endif
   86 void     lockmgr_printinfo(const struct lock *lk);
   87 int      lockstatus(const struct lock *lk);
   88 
   89 /*
   90  * As far as the ilk can be a static NULL pointer these functions need a
   91  * strict prototype in order to safely use the lock_object member.
   92  */
   93 static __inline int
   94 _lockmgr_args(struct lock *lk, u_int flags, struct mtx *ilk, const char *wmesg,
   95     int prio, int timo, const char *file, int line)
   96 {
   97 
   98         return (__lockmgr_args(lk, flags, (ilk != NULL) ? &ilk->lock_object :
   99             NULL, wmesg, prio, timo, file, line));
  100 }
  101 
  102 static __inline int
  103 _lockmgr_args_rw(struct lock *lk, u_int flags, struct rwlock *ilk,
  104     const char *wmesg, int prio, int timo, const char *file, int line)
  105 {
  106 
  107         return (__lockmgr_args(lk, flags, (ilk != NULL) ? &ilk->lock_object :
  108             NULL, wmesg, prio, timo, file, line));
  109 }
  110 
  111 /*
  112  * Define aliases in order to complete lockmgr KPI.
  113  */
  114 #define lockmgr(lk, flags, ilk)                                         \
  115         _lockmgr_args((lk), (flags), (ilk), LK_WMESG_DEFAULT,           \
  116             LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, LOCK_FILE, LOCK_LINE)
  117 #define lockmgr_args(lk, flags, ilk, wmesg, prio, timo)                 \
  118         _lockmgr_args((lk), (flags), (ilk), (wmesg), (prio), (timo),    \
  119             LOCK_FILE, LOCK_LINE)
  120 #define lockmgr_args_rw(lk, flags, ilk, wmesg, prio, timo)              \
  121         _lockmgr_args_rw((lk), (flags), (ilk), (wmesg), (prio), (timo), \
  122             LOCK_FILE, LOCK_LINE)
  123 #define lockmgr_disown(lk)                                              \
  124         _lockmgr_disown((lk), LOCK_FILE, LOCK_LINE)
  125 #define lockmgr_recursed(lk)                                            \
  126         ((lk)->lk_recurse != 0)
  127 #define lockmgr_rw(lk, flags, ilk)                                      \
  128         _lockmgr_args_rw((lk), (flags), (ilk), LK_WMESG_DEFAULT,        \
  129             LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, LOCK_FILE, LOCK_LINE)
  130 #define lockmgr_waiters(lk)                                             \
  131         ((lk)->lk_lock & LK_ALL_WAITERS)
  132 #ifdef INVARIANTS
  133 #define lockmgr_assert(lk, what)                                        \
  134         _lockmgr_assert((lk), (what), LOCK_FILE, LOCK_LINE)
  135 #else
  136 #define lockmgr_assert(lk, what)
  137 #endif
  138 
  139 /*
  140  * Flags for lockinit().
  141  */
  142 #define LK_INIT_MASK    0x0000FF
  143 #define LK_CANRECURSE   0x000001
  144 #define LK_NODUP        0x000002
  145 #define LK_NOPROFILE    0x000004
  146 #define LK_NOSHARE      0x000008
  147 #define LK_NOWITNESS    0x000010
  148 #define LK_QUIET        0x000020
  149 #define LK_ADAPTIVE     0x000040
  150 #define LK_IS_VNODE     0x000080        /* Tell WITNESS about a VNODE lock */
  151 
  152 /*
  153  * Additional attributes to be used in lockmgr().
  154  */
  155 #define LK_EATTR_MASK   0x00FF00
  156 #define LK_INTERLOCK    0x000100
  157 #define LK_NOWAIT       0x000200
  158 #define LK_RETRY        0x000400
  159 #define LK_SLEEPFAIL    0x000800
  160 #define LK_TIMELOCK     0x001000
  161 #define LK_NODDLKTREAT  0x002000
  162 
  163 /*
  164  * Operations for lockmgr().
  165  */
  166 #define LK_TYPE_MASK    0xFF0000
  167 #define LK_DOWNGRADE    0x010000
  168 #define LK_DRAIN        0x020000
  169 #define LK_EXCLOTHER    0x040000
  170 #define LK_EXCLUSIVE    0x080000
  171 #define LK_RELEASE      0x100000
  172 #define LK_SHARED       0x200000
  173 #define LK_UPGRADE      0x400000
  174 #define LK_TRYUPGRADE   0x800000
  175 
  176 #define LK_TOTAL_MASK   (LK_INIT_MASK | LK_EATTR_MASK | LK_TYPE_MASK)
  177 
  178 /*
  179  * Default values for lockmgr_args().
  180  */
  181 #define LK_WMESG_DEFAULT        (NULL)
  182 #define LK_PRIO_DEFAULT         (0)
  183 #define LK_TIMO_DEFAULT         (0)
  184 
  185 /*
  186  * Assertion flags.
  187  */
  188 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
  189 #define KA_LOCKED       LA_LOCKED
  190 #define KA_SLOCKED      LA_SLOCKED
  191 #define KA_XLOCKED      LA_XLOCKED
  192 #define KA_UNLOCKED     LA_UNLOCKED
  193 #define KA_RECURSED     LA_RECURSED
  194 #define KA_NOTRECURSED  LA_NOTRECURSED
  195 #endif
  196 
  197 #endif /* _KERNEL */
  198 
  199 #endif /* !_SYS_LOCKMGR_H_ */

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