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ltsleep.c revision 1.17 
      1 /*	$NetBSD: ltsleep.c,v 1.17 2009/09/04 16:42:19 pooka Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2007 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Development of this software was supported by the
      7  * Finnish Cultural Foundation.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     19  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     21  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     28  * SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: ltsleep.c,v 1.17 2009/09/04 16:42:19 pooka Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/proc.h>
     36 #include <sys/queue.h>
     37 #include <sys/simplelock.h>
     38 
     39 #include <rump/rumpuser.h>
     40 
     41 #include "rump_private.h"
     42 
     43 struct ltsleeper {
     44 	wchan_t id;
     45 	kcondvar_t cv;
     46 	LIST_ENTRY(ltsleeper) entries;
     47 };
     48 
     49 static LIST_HEAD(, ltsleeper) sleepers = LIST_HEAD_INITIALIZER(sleepers);
     50 static kmutex_t sleepermtx;
     51 
     52 kcondvar_t lbolt; /* Oh Kath Ra */
     53 
     54 int
     55 ltsleep(wchan_t ident, pri_t prio, const char *wmesg, int timo,
     56 	volatile struct simplelock *slock)
     57 {
     58 	struct ltsleeper lts;
     59 	int nlocks;
     60 
     61 	lts.id = ident;
     62 	cv_init(&lts.cv, NULL);
     63 
     64 	while (!mutex_tryenter(&sleepermtx))
     65 		continue;
     66 	KERNEL_UNLOCK_ALL(curlwp, &nlocks);
     67 	if (slock)
     68 		simple_unlock(slock);
     69 	LIST_INSERT_HEAD(&sleepers, &lts, entries);
     70 
     71 	/* protected by sleepermtx */
     72 	cv_wait(&lts.cv, &sleepermtx);
     73 
     74 	LIST_REMOVE(&lts, entries);
     75 	mutex_exit(&sleepermtx);
     76 
     77 	cv_destroy(&lts.cv);
     78 
     79 	KERNEL_LOCK(nlocks, curlwp);
     80 
     81 	if (slock && (prio & PNORELOCK) == 0)
     82 		simple_lock(slock);
     83 
     84 	return 0;
     85 }
     86 
     87 int
     88 mtsleep(wchan_t ident, pri_t prio, const char *wmesg, int timo,
     89 	kmutex_t *lock)
     90 {
     91 	struct ltsleeper lts;
     92 	int nlocks;
     93 
     94 	lts.id = ident;
     95 	cv_init(&lts.cv, NULL);
     96 
     97 	while (!mutex_tryenter(&sleepermtx))
     98 		continue;
     99 	KERNEL_UNLOCK_ALL(curlwp, &nlocks);
    100 	LIST_INSERT_HEAD(&sleepers, &lts, entries);
    101 
    102 	/* protected by sleepermtx */
    103 	mutex_exit(lock);
    104 	cv_wait(&lts.cv, &sleepermtx);
    105 
    106 	LIST_REMOVE(&lts, entries);
    107 	mutex_exit(&sleepermtx);
    108 
    109 	cv_destroy(&lts.cv);
    110 
    111 	KERNEL_LOCK(nlocks, curlwp);
    112 
    113 	if ((prio & PNORELOCK) == 0)
    114 		mutex_enter(lock);
    115 
    116 	return 0;
    117 }
    118 
    119 void
    120 wakeup(wchan_t ident)
    121 {
    122 	struct ltsleeper *ltsp;
    123 
    124 	mutex_enter(&sleepermtx);
    125 	LIST_FOREACH(ltsp, &sleepers, entries) {
    126 		if (ltsp->id == ident) {
    127 			cv_broadcast(&ltsp->cv);
    128 		}
    129 	}
    130 	mutex_exit(&sleepermtx);
    131 }
    132 
    133 void
    134 wakeup_one(wchan_t ident)
    135 {
    136 	struct ltsleeper *ltsp;
    137 
    138 	mutex_enter(&sleepermtx);
    139 	LIST_FOREACH(ltsp, &sleepers, entries) {
    140 		if (ltsp->id == ident) {
    141 			cv_signal(&ltsp->cv);
    142 			break;
    143 		}
    144 	}
    145 	mutex_exit(&sleepermtx);
    146 }
    147 
    148 void
    149 rump_sleepers_init(void)
    150 {
    151 
    152 	mutex_init(&sleepermtx, MUTEX_DEFAULT, 0);
    153 }
    154