include/sys/sleepq.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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #ifndef _SYS_SLEEPQ_H
  27 #define _SYS_SLEEPQ_H
  28
  29 #include <sys/machlock.h>
  30
  31 #ifdef  __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 /*
  36  * Common definition for a sleep queue,
  37  * be it an old-style sleep queue, or
  38  * a constituent of a turnstile.
  39  */
  40
  41 typedef struct sleepq {
  42         struct _kthread *sq_first;
  43 } sleepq_t;
  44
  45 /*
  46  * Definition of the head of a sleep queue hash bucket.
  47  */
  48 typedef struct _sleepq_head {
  49         sleepq_t        sq_queue;
  50         disp_lock_t     sq_lock;
  51 } sleepq_head_t;
  52
  53 #ifdef  _KERNEL
  54
  55 #define NSLEEPQ         2048
  56 #define SQHASHINDEX(X)  \
  57         ((((uintptr_t)(X) >> 2) ^ ((uintptr_t)(X) >> 13) ^      \
  58         ((uintptr_t)(X) >> 24)) & (NSLEEPQ - 1))
  59 #define SQHASH(X)       (&sleepq_head[SQHASHINDEX(X)])
  60
  61 extern sleepq_head_t    sleepq_head[NSLEEPQ];
  62
  63 extern void             sleepq_insert(sleepq_t *, struct _kthread *);
  64 extern struct _kthread  *sleepq_wakeone_chan(sleepq_t *, void *);
  65 extern void             sleepq_wakeall_chan(sleepq_t *, void *);
  66 extern void             sleepq_unsleep(struct _kthread *);
  67 extern void             sleepq_dequeue(struct _kthread *);
  68 extern void             sleepq_unlink(struct _kthread **, struct _kthread *);
  69
  70 #endif  /* _KERNEL */
  71
  72 #ifdef  __cplusplus
  73 }
  74 #endif
  75
  76 #endif  /* _SYS_SLEEPQ_H */