usr/src/uts/common/sys/turnstile.h

root/usr/src/uts/common/sys/turnstile.h
/*
 * 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

#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 */
Illumos
