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