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

   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 2003 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _SYS_TURNSTILE_H
  28 #define _SYS_TURNSTILE_H
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include <sys/types.h>
  33 #include <sys/time.h>
  34 #include <sys/param.h>
  35 #include <sys/sleepq.h>
  36 #include <sys/mutex.h>
  37 #include <sys/lwp_timer_impl.h>
  38
  39 #ifdef  __cplusplus
  40 extern "C" {
  41 #endif
  42
  43 #define TS_WRITER_Q     0       /* writer sleepq (exclusive access to sobj) */
  44 #define TS_READER_Q     1       /* reader sleepq (shared access to sobj) */
  45 #define TS_NUM_Q        2       /* number of sleep queues per turnstile */
  46
  47 typedef struct turnstile turnstile_t;
  48 struct _sobj_ops;
  49
  50 struct turnstile {
  51         turnstile_t     *ts_next;       /* next on hash chain */
  52         turnstile_t     *ts_free;       /* next on freelist */
  53         void            *ts_sobj;       /* s-object threads are blocking on */
  54         int             ts_waiters;     /* number of blocked threads */
  55         pri_t           ts_epri;        /* max priority of blocked threads */
  56         struct _kthread *ts_inheritor;  /* thread inheriting priority */
  57         turnstile_t     *ts_prioinv;    /* next in inheritor's t_prioinv list */
  58         sleepq_t        ts_sleepq[TS_NUM_Q]; /* read/write sleep queues */
  59 };
  60
  61 #ifdef  _KERNEL
  62
  63 extern turnstile_t *turnstile_lookup(void *);
  64 extern void turnstile_exit(void *);
  65 extern int turnstile_block(turnstile_t *, int, void *, struct _sobj_ops *,
  66     kmutex_t *, lwp_timer_t *);
  67 extern void turnstile_wakeup(turnstile_t *, int, int, struct _kthread *);
  68 extern void turnstile_change_pri(struct _kthread *, pri_t, pri_t *);
  69 extern void turnstile_unsleep(struct _kthread *);
  70 extern void turnstile_stay_asleep(struct _kthread *);
  71 extern void turnstile_pi_recalc(void);
  72
  73 #endif  /* _KERNEL */
  74
  75 #ifdef  __cplusplus
  76 }
  77 #endif
  78
  79 #endif  /* _SYS_TURNSTILE_H */