turnstile.h revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* 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 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_TURNSTILE_H
#define _SYS_TURNSTILE_H
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/time.h>
#include <sys/param.h>
#include <sys/sleepq.h>
#include <sys/mutex.h>
#include <sys/lwp_timer_impl.h>
#ifdef __cplusplus
extern "C" {
#endif
#define TS_WRITER_Q 0 /* writer sleepq (exclusive access to sobj) */
#define TS_READER_Q 1 /* reader sleepq (shared access to sobj) */
#define TS_NUM_Q 2 /* number of sleep queues per turnstile */
typedef struct turnstile turnstile_t;
struct _sobj_ops;
struct turnstile {
turnstile_t *ts_next; /* next on hash chain */
turnstile_t *ts_free; /* next on freelist */
void *ts_sobj; /* s-object threads are blocking on */
int ts_waiters; /* number of blocked threads */
pri_t ts_epri; /* max priority of blocked threads */
struct _kthread *ts_inheritor; /* thread inheriting priority */
turnstile_t *ts_prioinv; /* next in inheritor's t_prioinv list */
sleepq_t ts_sleepq[TS_NUM_Q]; /* read/write sleep queues */
};
#ifdef _KERNEL
extern turnstile_t *turnstile_lookup(void *);
extern void turnstile_exit(void *);
extern int turnstile_block(turnstile_t *, int, void *, struct _sobj_ops *,
kmutex_t *, lwp_timer_t *);
extern void turnstile_wakeup(turnstile_t *, int, int, struct _kthread *);
extern void turnstile_change_pri(struct _kthread *, pri_t, pri_t *);
extern void turnstile_unsleep(struct _kthread *);
extern void turnstile_stay_asleep(struct _kthread *);
extern void turnstile_pi_recalc(void);
#endif /* _KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_TURNSTILE_H */