1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START 3*7c478bd9Sstevel@tonic-gate * 4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*7c478bd9Sstevel@tonic-gate * with the License. 8*7c478bd9Sstevel@tonic-gate * 9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 12*7c478bd9Sstevel@tonic-gate * and limitations under the License. 13*7c478bd9Sstevel@tonic-gate * 14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*7c478bd9Sstevel@tonic-gate * 20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END 21*7c478bd9Sstevel@tonic-gate */ 22*7c478bd9Sstevel@tonic-gate /* 23*7c478bd9Sstevel@tonic-gate * Copyright (c) 1991-1998 by Sun Microsystems, Inc. 24*7c478bd9Sstevel@tonic-gate * All rights reserved. 25*7c478bd9Sstevel@tonic-gate */ 26*7c478bd9Sstevel@tonic-gate 27*7c478bd9Sstevel@tonic-gate #ifndef _SYS_RWLOCK_H 28*7c478bd9Sstevel@tonic-gate #define _SYS_RWLOCK_H 29*7c478bd9Sstevel@tonic-gate 30*7c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 31*7c478bd9Sstevel@tonic-gate 32*7c478bd9Sstevel@tonic-gate /* 33*7c478bd9Sstevel@tonic-gate * Public interface to readers/writer locks. See rwlock(9F) for details. 34*7c478bd9Sstevel@tonic-gate */ 35*7c478bd9Sstevel@tonic-gate 36*7c478bd9Sstevel@tonic-gate #include <sys/types.h> 37*7c478bd9Sstevel@tonic-gate 38*7c478bd9Sstevel@tonic-gate #ifdef __cplusplus 39*7c478bd9Sstevel@tonic-gate extern "C" { 40*7c478bd9Sstevel@tonic-gate #endif 41*7c478bd9Sstevel@tonic-gate 42*7c478bd9Sstevel@tonic-gate #ifndef _ASM 43*7c478bd9Sstevel@tonic-gate 44*7c478bd9Sstevel@tonic-gate typedef enum { 45*7c478bd9Sstevel@tonic-gate RW_DRIVER = 2, /* driver (DDI) rwlock */ 46*7c478bd9Sstevel@tonic-gate RW_DEFAULT = 4 /* kernel default rwlock */ 47*7c478bd9Sstevel@tonic-gate } krw_type_t; 48*7c478bd9Sstevel@tonic-gate 49*7c478bd9Sstevel@tonic-gate typedef enum { 50*7c478bd9Sstevel@tonic-gate RW_WRITER, 51*7c478bd9Sstevel@tonic-gate RW_READER 52*7c478bd9Sstevel@tonic-gate } krw_t; 53*7c478bd9Sstevel@tonic-gate 54*7c478bd9Sstevel@tonic-gate typedef struct _krwlock { 55*7c478bd9Sstevel@tonic-gate void *_opaque[1]; 56*7c478bd9Sstevel@tonic-gate } krwlock_t; 57*7c478bd9Sstevel@tonic-gate 58*7c478bd9Sstevel@tonic-gate #if defined(_KERNEL) 59*7c478bd9Sstevel@tonic-gate 60*7c478bd9Sstevel@tonic-gate #define RW_READ_HELD(x) (rw_read_held((x))) 61*7c478bd9Sstevel@tonic-gate #define RW_WRITE_HELD(x) (rw_write_held((x))) 62*7c478bd9Sstevel@tonic-gate #define RW_LOCK_HELD(x) (rw_lock_held((x))) 63*7c478bd9Sstevel@tonic-gate #define RW_ISWRITER(x) (rw_iswriter(x)) 64*7c478bd9Sstevel@tonic-gate 65*7c478bd9Sstevel@tonic-gate extern void rw_init(krwlock_t *, char *, krw_type_t, void *); 66*7c478bd9Sstevel@tonic-gate extern void rw_destroy(krwlock_t *); 67*7c478bd9Sstevel@tonic-gate extern void rw_enter(krwlock_t *, krw_t); 68*7c478bd9Sstevel@tonic-gate extern int rw_tryenter(krwlock_t *, krw_t); 69*7c478bd9Sstevel@tonic-gate extern void rw_exit(krwlock_t *); 70*7c478bd9Sstevel@tonic-gate extern void rw_downgrade(krwlock_t *); 71*7c478bd9Sstevel@tonic-gate extern int rw_tryupgrade(krwlock_t *); 72*7c478bd9Sstevel@tonic-gate extern int rw_read_held(krwlock_t *); 73*7c478bd9Sstevel@tonic-gate extern int rw_write_held(krwlock_t *); 74*7c478bd9Sstevel@tonic-gate extern int rw_lock_held(krwlock_t *); 75*7c478bd9Sstevel@tonic-gate extern int rw_read_locked(krwlock_t *); 76*7c478bd9Sstevel@tonic-gate extern int rw_iswriter(krwlock_t *); 77*7c478bd9Sstevel@tonic-gate extern struct _kthread *rw_owner(krwlock_t *); 78*7c478bd9Sstevel@tonic-gate 79*7c478bd9Sstevel@tonic-gate #endif /* defined(_KERNEL) */ 80*7c478bd9Sstevel@tonic-gate 81*7c478bd9Sstevel@tonic-gate #endif /* _ASM */ 82*7c478bd9Sstevel@tonic-gate 83*7c478bd9Sstevel@tonic-gate #ifdef __cplusplus 84*7c478bd9Sstevel@tonic-gate } 85*7c478bd9Sstevel@tonic-gate #endif 86*7c478bd9Sstevel@tonic-gate 87*7c478bd9Sstevel@tonic-gate #endif /* _SYS_RWLOCK_H */ 88