Home | History | Annotate | Line # | Download | only in rumpkern
ltsleep.c revision 1.6 
      1 /*	$NetBSD: ltsleep.c,v 1.6 2008/01/27 19:07:21 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/param.h>
     32 #include <sys/proc.h>
     33 #include <sys/queue.h>
     34 #include <sys/simplelock.h>
     35 
     36 #include "rump_private.h"
     37 #include "rumpuser.h"
     38 
     39 struct ltsleeper {
     40 	wchan_t id;
     41 	kcondvar_t cv;
     42 	LIST_ENTRY(ltsleeper) entries;
     43 };
     44 
     45 static LIST_HEAD(, ltsleeper) sleepers = LIST_HEAD_INITIALIZER(sleepers);
     46 static kmutex_t sleepermtx;
     47 
     48 kcondvar_t lbolt; /* Oh Kath Ra */
     49 
     50 int
     51 ltsleep(wchan_t ident, pri_t prio, const char *wmesg, int timo,
     52 	volatile struct simplelock *slock)
     53 {
     54 	struct ltsleeper lts;
     55 	int iplrecurse;
     56 
     57 	lts.id = ident;
     58 	cv_init(&lts.cv, NULL);
     59 
     60 	mutex_enter(&sleepermtx);
     61 	LIST_INSERT_HEAD(&sleepers, &lts, entries);
     62 
     63 	/* release spl */
     64 	iplrecurse = rumpuser_whatis_ipl();
     65 	while (iplrecurse--)
     66 		rumpuser_rw_exit(&rumpspl);
     67 
     68 	/* protected by sleepermtx */
     69 	if (slock)
     70 		simple_unlock(slock);
     71 	cv_wait(&lts.cv, &sleepermtx);
     72 
     73 	/* retake ipl */
     74 	iplrecurse = rumpuser_whatis_ipl();
     75 	while (iplrecurse--)
     76 		rumpuser_rw_enter(&rumpspl, 0);
     77 
     78 	LIST_REMOVE(&lts, entries);
     79 	mutex_exit(&sleepermtx);
     80 
     81 	cv_destroy(&lts.cv);
     82 
     83 	if (slock && (prio & PNORELOCK) == 0)
     84 		simple_lock(slock);
     85 
     86 	return 0;
     87 }
     88 
     89 int
     90 mtsleep(wchan_t ident, pri_t prio, const char *wmesg, int timo,
     91 	kmutex_t *lock)
     92 {
     93 	struct ltsleeper lts;
     94 	int iplrecurse;
     95 
     96 	lts.id = ident;
     97 	cv_init(&lts.cv, NULL);
     98 
     99 	mutex_enter(&sleepermtx);
    100 	LIST_INSERT_HEAD(&sleepers, &lts, entries);
    101 
    102 	/* release spl */
    103 	iplrecurse = rumpuser_whatis_ipl();
    104 	while (iplrecurse--)
    105 		rumpuser_rw_exit(&rumpspl);
    106 
    107 	/* protected by sleepermtx */
    108 	mutex_exit(lock);
    109 	cv_wait(&lts.cv, &sleepermtx);
    110 
    111 	/* retake ipl */
    112 	iplrecurse = rumpuser_whatis_ipl();
    113 	while (iplrecurse--)
    114 		rumpuser_rw_enter(&rumpspl, 0);
    115 
    116 	LIST_REMOVE(&lts, entries);
    117 	mutex_exit(&sleepermtx);
    118 
    119 	cv_destroy(&lts.cv);
    120 
    121 	if ((prio & PNORELOCK) == 0)
    122 		mutex_enter(lock);
    123 
    124 	return 0;
    125 }
    126 
    127 void
    128 wakeup(wchan_t ident)
    129 {
    130 	struct ltsleeper *ltsp;
    131 
    132 	mutex_enter(&sleepermtx);
    133 	LIST_FOREACH(ltsp, &sleepers, entries)
    134 		if (ltsp->id == ident)
    135 			cv_signal(&ltsp->cv);
    136 	mutex_exit(&sleepermtx);
    137 }
    138 
    139 void
    140 rump_sleepers_init()
    141 {
    142 
    143 	mutex_init(&sleepermtx, MUTEX_DEFAULT, 0);
    144 }
    145