rmlock.h revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2007 Stephan Uphoff <ups@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, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the author nor the names of any co-contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD: stable/11/sys/sys/rmlock.h 330897 2018-03-14 03:19:51Z eadler $ 32 */ 33 34#ifndef _SYS_RMLOCK_H_ 35#define _SYS_RMLOCK_H_ 36 37#include <sys/mutex.h> 38#include <sys/sx.h> 39#include <sys/_lock.h> 40#include <sys/_rmlock.h> 41 42#ifdef _KERNEL 43 44/* 45 * Flags passed to rm_init_flags(9). 46 */ 47#define RM_NOWITNESS 0x00000001 48#define RM_RECURSE 0x00000002 49#define RM_SLEEPABLE 0x00000004 50#define RM_NEW 0x00000008 51 52void rm_init(struct rmlock *rm, const char *name); 53void rm_init_flags(struct rmlock *rm, const char *name, int opts); 54void rm_destroy(struct rmlock *rm); 55int rm_wowned(const struct rmlock *rm); 56void rm_sysinit(void *arg); 57void rm_sysinit_flags(void *arg); 58 59void _rm_wlock_debug(struct rmlock *rm, const char *file, int line); 60void _rm_wunlock_debug(struct rmlock *rm, const char *file, int line); 61int _rm_rlock_debug(struct rmlock *rm, struct rm_priotracker *tracker, 62 int trylock, const char *file, int line); 63void _rm_runlock_debug(struct rmlock *rm, struct rm_priotracker *tracker, 64 const char *file, int line); 65 66void _rm_wlock(struct rmlock *rm); 67void _rm_wunlock(struct rmlock *rm); 68int _rm_rlock(struct rmlock *rm, struct rm_priotracker *tracker, 69 int trylock); 70void _rm_runlock(struct rmlock *rm, struct rm_priotracker *tracker); 71#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) 72void _rm_assert(const struct rmlock *rm, int what, const char *file, 73 int line); 74#endif 75 76/* 77 * Public interface for lock operations. 78 */ 79#ifndef LOCK_DEBUG 80#error LOCK_DEBUG not defined, include <sys/lock.h> before <sys/rmlock.h> 81#endif 82 83#if LOCK_DEBUG > 0 84#define rm_wlock(rm) _rm_wlock_debug((rm), LOCK_FILE, LOCK_LINE) 85#define rm_wunlock(rm) _rm_wunlock_debug((rm), LOCK_FILE, LOCK_LINE) 86#define rm_rlock(rm,tracker) \ 87 ((void)_rm_rlock_debug((rm),(tracker), 0, LOCK_FILE, LOCK_LINE )) 88#define rm_try_rlock(rm,tracker) \ 89 _rm_rlock_debug((rm),(tracker), 1, LOCK_FILE, LOCK_LINE ) 90#define rm_runlock(rm,tracker) \ 91 _rm_runlock_debug((rm), (tracker), LOCK_FILE, LOCK_LINE ) 92#else 93#define rm_wlock(rm) _rm_wlock((rm)) 94#define rm_wunlock(rm) _rm_wunlock((rm)) 95#define rm_rlock(rm,tracker) ((void)_rm_rlock((rm),(tracker), 0)) 96#define rm_try_rlock(rm,tracker) _rm_rlock((rm),(tracker), 1) 97#define rm_runlock(rm,tracker) _rm_runlock((rm), (tracker)) 98#endif 99#define rm_sleep(chan, rm, pri, wmesg, timo) \ 100 _sleep((chan), &(rm)->lock_object, (pri), (wmesg), \ 101 tick_sbt * (timo), 0, C_HARDCLOCK) 102 103struct rm_args { 104 struct rmlock *ra_rm; 105 const char *ra_desc; 106 int ra_flags; 107}; 108 109#define RM_SYSINIT_FLAGS(name, rm, desc, flags) \ 110 static struct rm_args name##_args = { \ 111 (rm), \ 112 (desc), \ 113 (flags), \ 114 }; \ 115 SYSINIT(name##_rm_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \ 116 rm_sysinit, &name##_args); \ 117 SYSUNINIT(name##_rm_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \ 118 rm_destroy, (rm)) 119 120#define RM_SYSINIT(name, rm, desc) RM_SYSINIT_FLAGS(name, rm, desc, 0) 121 122#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) 123#define RA_LOCKED LA_LOCKED 124#define RA_RLOCKED LA_SLOCKED 125#define RA_WLOCKED LA_XLOCKED 126#define RA_UNLOCKED LA_UNLOCKED 127#define RA_RECURSED LA_RECURSED 128#define RA_NOTRECURSED LA_NOTRECURSED 129#endif 130 131#ifdef INVARIANTS 132#define rm_assert(rm, what) _rm_assert((rm), (what), LOCK_FILE, LOCK_LINE) 133#else 134#define rm_assert(rm, what) 135#endif 136 137#endif /* _KERNEL */ 138#endif /* !_SYS_RMLOCK_H_ */ 139