1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #ifndef _SYS_RWLOCK_IMPL_H 28*0Sstevel@tonic-gate #define _SYS_RWLOCK_IMPL_H 29*0Sstevel@tonic-gate 30*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 31*0Sstevel@tonic-gate 32*0Sstevel@tonic-gate /* 33*0Sstevel@tonic-gate * Implementation-private definitions for readers/writer locks. 34*0Sstevel@tonic-gate */ 35*0Sstevel@tonic-gate 36*0Sstevel@tonic-gate #ifndef _ASM 37*0Sstevel@tonic-gate 38*0Sstevel@tonic-gate #include <sys/rwlock.h> 39*0Sstevel@tonic-gate 40*0Sstevel@tonic-gate #ifdef __cplusplus 41*0Sstevel@tonic-gate extern "C" { 42*0Sstevel@tonic-gate #endif 43*0Sstevel@tonic-gate 44*0Sstevel@tonic-gate typedef struct rwlock_impl { 45*0Sstevel@tonic-gate uintptr_t rw_wwwh; /* waiters, write wanted, hold count */ 46*0Sstevel@tonic-gate } rwlock_impl_t; 47*0Sstevel@tonic-gate 48*0Sstevel@tonic-gate #endif /* _ASM */ 49*0Sstevel@tonic-gate 50*0Sstevel@tonic-gate #define RW_HAS_WAITERS 1 51*0Sstevel@tonic-gate #define RW_WRITE_WANTED 2 52*0Sstevel@tonic-gate #define RW_WRITE_LOCKED 4 53*0Sstevel@tonic-gate #define RW_READ_LOCK 8 54*0Sstevel@tonic-gate #define RW_WRITE_LOCK(thread) ((uintptr_t)(thread) | RW_WRITE_LOCKED) 55*0Sstevel@tonic-gate #define RW_HOLD_COUNT (-RW_READ_LOCK) 56*0Sstevel@tonic-gate #define RW_HOLD_COUNT_SHIFT 3 /* log2(RW_READ_LOCK) */ 57*0Sstevel@tonic-gate #define RW_READ_COUNT RW_HOLD_COUNT 58*0Sstevel@tonic-gate #define RW_OWNER RW_HOLD_COUNT 59*0Sstevel@tonic-gate #define RW_LOCKED RW_HOLD_COUNT 60*0Sstevel@tonic-gate #define RW_WRITE_CLAIMED (RW_WRITE_LOCKED | RW_WRITE_WANTED) 61*0Sstevel@tonic-gate #define RW_DOUBLE_LOCK (RW_WRITE_LOCK(0) | RW_READ_LOCK) 62*0Sstevel@tonic-gate 63*0Sstevel@tonic-gate /* 64*0Sstevel@tonic-gate * These macros are used by both the implementation of rw_*() routines and 65*0Sstevel@tonic-gate * by the implementation of the rwlock-related DTrace subroutines. (DTrace 66*0Sstevel@tonic-gate * cannot make calls into the rw_*() routines; it must use the macros.) 67*0Sstevel@tonic-gate */ 68*0Sstevel@tonic-gate #define _RW_READ_HELD(rwlp, tmp) \ 69*0Sstevel@tonic-gate ((((tmp) = ((rwlock_impl_t *)(rwlp))->rw_wwwh) & RW_LOCKED) && \ 70*0Sstevel@tonic-gate !((tmp) & RW_WRITE_LOCKED)) 71*0Sstevel@tonic-gate 72*0Sstevel@tonic-gate #define _RW_WRITE_HELD(rwlp) \ 73*0Sstevel@tonic-gate ((((rwlock_impl_t *)(rwlp))->rw_wwwh & \ 74*0Sstevel@tonic-gate (RW_OWNER | RW_WRITE_LOCKED)) == RW_WRITE_LOCK(curthread)) 75*0Sstevel@tonic-gate 76*0Sstevel@tonic-gate #define _RW_LOCK_HELD(rwlp) \ 77*0Sstevel@tonic-gate ((((rwlock_impl_t *)(rwlp))->rw_wwwh & RW_LOCKED) ? 1 : 0) 78*0Sstevel@tonic-gate 79*0Sstevel@tonic-gate #define _RW_ISWRITER(rwlp) \ 80*0Sstevel@tonic-gate ((((rwlock_impl_t *)(rwlp))->rw_wwwh & RW_WRITE_CLAIMED) ? 1 : 0) 81*0Sstevel@tonic-gate 82*0Sstevel@tonic-gate #ifdef __cplusplus 83*0Sstevel@tonic-gate } 84*0Sstevel@tonic-gate #endif 85*0Sstevel@tonic-gate 86*0Sstevel@tonic-gate #endif /* _SYS_RWLOCK_IMPL_H */ 87