Now available: 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 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008 Attilio Rao <attilio@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice(s), this list of conditions and the following disclaimer as 12 * the first lines of this file unmodified other than the possible 13 * addition of one or more copyright notices. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice(s), this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY 22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 28 * DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 33 #ifndef _SYS_LOCKMGR_H_ 34 #define _SYS_LOCKMGR_H_ 35 36 #include <sys/_lock.h> 37 #include <sys/_lockmgr.h> 38 #include <sys/_mutex.h> 39 #include <sys/_rwlock.h> 40 41 #define LK_SHARE 0x01 42 #define LK_SHARED_WAITERS 0x02 43 #define LK_EXCLUSIVE_WAITERS 0x04 44 #define LK_EXCLUSIVE_SPINNERS 0x08 45 #define LK_WRITER_RECURSED 0x10 46 #define LK_ALL_WAITERS \ 47 (LK_SHARED_WAITERS | LK_EXCLUSIVE_WAITERS) 48 #define LK_FLAGMASK \ 49 (LK_SHARE | LK_ALL_WAITERS | LK_EXCLUSIVE_SPINNERS | LK_WRITER_RECURSED) 50 51 #define LK_HOLDER(x) ((x) & ~LK_FLAGMASK) 52 #define LK_SHARERS_SHIFT 5 53 #define LK_SHARERS(x) (LK_HOLDER(x) >> LK_SHARERS_SHIFT) 54 #define LK_SHARERS_LOCK(x) ((x) << LK_SHARERS_SHIFT | LK_SHARE) 55 #define LK_ONE_SHARER (1 << LK_SHARERS_SHIFT) 56 #define LK_UNLOCKED LK_SHARERS_LOCK(0) 57 #define LK_KERNPROC ((uintptr_t)(-1) & ~LK_FLAGMASK) 58 59 #ifdef _KERNEL 60 61 #if !defined(LOCK_FILE) || !defined(LOCK_LINE) 62 #error "LOCK_FILE and LOCK_LINE not defined, include <sys/lock.h> before" 63 #endif 64 65 struct thread; 66 #define lk_recurse lock_object.lo_data 67 68 /* 69 * Function prototipes. Routines that start with an underscore are not part 70 * of the public interface and might be wrappered with a macro. 71 */ 72 int __lockmgr_args(struct lock *lk, u_int flags, struct lock_object *ilk, 73 const char *wmesg, int prio, int timo, const char *file, int line); 74 int lockmgr_lock_flags(struct lock *lk, u_int flags, 75 struct lock_object *ilk, const char *file, int line); 76 int lockmgr_slock(struct lock *lk, u_int flags, const char *file, int line); 77 int lockmgr_xlock(struct lock *lk, u_int flags, const char *file, int line); 78 int lockmgr_unlock(struct lock *lk); 79 80 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) 81 void _lockmgr_assert(const struct lock *lk, int what, const char *file, int line); 82 #endif 83 void _lockmgr_disown(struct lock *lk, const char *file, int line); 84 85 void lockallowrecurse(struct lock *lk); 86 void lockallowshare(struct lock *lk); 87 void lockdestroy(struct lock *lk); 88 void lockdisablerecurse(struct lock *lk); 89 void lockdisableshare(struct lock *lk); 90 void lockinit(struct lock *lk, int prio, const char *wmesg, int timo, 91 int flags); 92 #ifdef DDB 93 int lockmgr_chain(struct thread *td, struct thread **ownerp); 94 #endif 95 void lockmgr_printinfo(const struct lock *lk); 96 int lockstatus(const struct lock *lk); 97 98 /* 99 * As far as the ilk can be a static NULL pointer these functions need a 100 * strict prototype in order to safely use the lock_object member. 101 */ 102 static __inline int 103 _lockmgr_args(struct lock *lk, u_int flags, struct mtx *ilk, const char *wmesg, 104 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 static __inline int 112 _lockmgr_args_rw(struct lock *lk, u_int flags, struct rwlock *ilk, 113 const char *wmesg, int prio, int timo, const char *file, int line) 114 { 115 116 return (__lockmgr_args(lk, flags, (ilk != NULL) ? &ilk->lock_object : 117 NULL, wmesg, prio, timo, file, line)); 118 } 119 120 /* 121 * Define aliases in order to complete lockmgr KPI. 122 */ 123 #define lockmgr_read_value(lk) ((lk)->lk_lock) 124 #define lockmgr(lk, flags, ilk) \ 125 _lockmgr_args((lk), (flags), (ilk), LK_WMESG_DEFAULT, \ 126 LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, LOCK_FILE, LOCK_LINE) 127 #define lockmgr_args(lk, flags, ilk, wmesg, prio, timo) \ 128 _lockmgr_args((lk), (flags), (ilk), (wmesg), (prio), (timo), \ 129 LOCK_FILE, LOCK_LINE) 130 #define lockmgr_args_rw(lk, flags, ilk, wmesg, prio, timo) \ 131 _lockmgr_args_rw((lk), (flags), (ilk), (wmesg), (prio), (timo), \ 132 LOCK_FILE, LOCK_LINE) 133 #define lockmgr_disown(lk) \ 134 _lockmgr_disown((lk), LOCK_FILE, LOCK_LINE) 135 #define lockmgr_recursed_v(v) \ 136 (v & LK_WRITER_RECURSED) 137 #define lockmgr_recursed(lk) \ 138 lockmgr_recursed_v((lk)->lk_lock) 139 #define lockmgr_rw(lk, flags, ilk) \ 140 _lockmgr_args_rw((lk), (flags), (ilk), LK_WMESG_DEFAULT, \ 141 LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, LOCK_FILE, LOCK_LINE) 142 #ifdef INVARIANTS 143 #define lockmgr_assert(lk, what) \ 144 _lockmgr_assert((lk), (what), LOCK_FILE, LOCK_LINE) 145 #else 146 #define lockmgr_assert(lk, what) 147 #endif 148 149 /* 150 * Flags for lockinit(). 151 */ 152 #define LK_INIT_MASK 0x0001FF 153 #define LK_CANRECURSE 0x000001 154 #define LK_NODUP 0x000002 155 #define LK_NOPROFILE 0x000004 156 #define LK_NOSHARE 0x000008 157 #define LK_NOWITNESS 0x000010 158 #define LK_QUIET 0x000020 159 #define LK_UNUSED0 0x000040 /* Was LK_ADAPTIVE */ 160 #define LK_IS_VNODE 0x000080 /* Tell WITNESS about a VNODE lock */ 161 #define LK_NEW 0x000100 162 163 /* 164 * Additional attributes to be used in lockmgr(). 165 */ 166 #define LK_EATTR_MASK 0x00FF00 167 #define LK_INTERLOCK 0x000100 168 #define LK_NOWAIT 0x000200 169 #define LK_RETRY 0x000400 170 #define LK_SLEEPFAIL 0x000800 171 #define LK_TIMELOCK 0x001000 172 #define LK_NODDLKTREAT 0x002000 173 #define LK_ADAPTIVE 0x004000 174 175 /* 176 * Operations for lockmgr(). 177 */ 178 #define LK_TYPE_MASK 0xFF0000 179 #define LK_DOWNGRADE 0x010000 180 #define LK_DRAIN 0x020000 181 #define LK_EXCLOTHER 0x040000 182 #define LK_EXCLUSIVE 0x080000 183 #define LK_RELEASE 0x100000 184 #define LK_SHARED 0x200000 185 #define LK_UPGRADE 0x400000 186 #define LK_TRYUPGRADE 0x800000 187 188 #define LK_TOTAL_MASK (LK_INIT_MASK | LK_EATTR_MASK | LK_TYPE_MASK) 189 190 /* 191 * Default values for lockmgr_args(). 192 */ 193 #define LK_WMESG_DEFAULT (NULL) 194 #define LK_PRIO_DEFAULT (0) 195 #define LK_TIMO_DEFAULT (0) 196 197 /* 198 * Assertion flags. 199 */ 200 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) 201 #define KA_LOCKED LA_LOCKED 202 #define KA_SLOCKED LA_SLOCKED 203 #define KA_XLOCKED LA_XLOCKED 204 #define KA_UNLOCKED LA_UNLOCKED 205 #define KA_RECURSED LA_RECURSED 206 #define KA_NOTRECURSED LA_NOTRECURSED 207 #endif 208 209 #endif /* _KERNEL */ 210 211 #endif /* !_SYS_LOCKMGR_H_ */
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