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 * $FreeBSD$ 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 #define LK_VNHELD 0x004000 163 164 /* 165 * Operations for lockmgr(). 166 */ 167 #define LK_TYPE_MASK 0xFF0000 168 #define LK_DOWNGRADE 0x010000 169 #define LK_DRAIN 0x020000 170 #define LK_EXCLOTHER 0x040000 171 #define LK_EXCLUSIVE 0x080000 172 #define LK_RELEASE 0x100000 173 #define LK_SHARED 0x200000 174 #define LK_UPGRADE 0x400000 175 #define LK_TRYUPGRADE 0x800000 176 177 #define LK_TOTAL_MASK (LK_INIT_MASK | LK_EATTR_MASK | LK_TYPE_MASK) 178 179 /* 180 * Default values for lockmgr_args(). 181 */ 182 #define LK_WMESG_DEFAULT (NULL) 183 #define LK_PRIO_DEFAULT (0) 184 #define LK_TIMO_DEFAULT (0) 185 186 /* 187 * Assertion flags. 188 */ 189 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) 190 #define KA_LOCKED LA_LOCKED 191 #define KA_SLOCKED LA_SLOCKED 192 #define KA_XLOCKED LA_XLOCKED 193 #define KA_UNLOCKED LA_UNLOCKED 194 #define KA_RECURSED LA_RECURSED 195 #define KA_NOTRECURSED LA_NOTRECURSED 196 #endif 197 198 #endif /* _KERNEL */ 199 200 #endif /* !_SYS_LOCKMGR_H_ */ 201