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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1991-1998 by Sun Microsystems, Inc.
* All rights reserved.
*/
#ifndef _SYS_RWLOCK_H
#define _SYS_RWLOCK_H
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Public interface to readers/writer locks. See rwlock(9F) for details.
*/
#include <sys/types.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifndef _ASM
typedef enum {
RW_DRIVER = 2, /* driver (DDI) rwlock */
RW_DEFAULT = 4 /* kernel default rwlock */
} krw_type_t;
typedef enum {
RW_WRITER,
RW_READER
} krw_t;
typedef struct _krwlock {
void *_opaque[1];
} krwlock_t;
#if defined(_KERNEL)
#define RW_READ_HELD(x) (rw_read_held((x)))
#define RW_WRITE_HELD(x) (rw_write_held((x)))
#define RW_LOCK_HELD(x) (rw_lock_held((x)))
#define RW_ISWRITER(x) (rw_iswriter(x))
extern void rw_init(krwlock_t *, char *, krw_type_t, void *);
extern void rw_destroy(krwlock_t *);
extern void rw_enter(krwlock_t *, krw_t);
extern int rw_tryenter(krwlock_t *, krw_t);
extern void rw_exit(krwlock_t *);
extern void rw_downgrade(krwlock_t *);
extern int rw_tryupgrade(krwlock_t *);
extern int rw_read_held(krwlock_t *);
extern int rw_write_held(krwlock_t *);
extern int rw_lock_held(krwlock_t *);
extern int rw_read_locked(krwlock_t *);
extern int rw_iswriter(krwlock_t *);
extern struct _kthread *rw_owner(krwlock_t *);
#endif /* defined(_KERNEL) */
#endif /* _ASM */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_RWLOCK_H */
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