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ltsleep.c revision 1.19 
      1 /*	$NetBSD: ltsleep.c,v 1.19 2009/10/15 00:28:46 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 1.19 2009/10/15 00:28:46 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 	struct rumpuser_cv *cv;
     46 	LIST_ENTRY(ltsleeper) entries;
     47 };
     48 
     49 static LIST_HEAD(, ltsleeper) sleepers = LIST_HEAD_INITIALIZER(sleepers);
     50 
     51 kcondvar_t lbolt; /* Oh Kath Ra */
     52 
     53 int
     54 ltsleep(wchan_t ident, pri_t prio, const char *wmesg, int timo,
     55 	volatile struct simplelock *slock)
     56 {
     57 	struct ltsleeper lts;
     58 	int nlocks;
     59 
     60 	lts.id = ident;
     61 	rumpuser_cv_init(&lts.cv);
     62 
     63 	if (slock)
     64 		simple_unlock(slock);
     65 	LIST_INSERT_HEAD(&sleepers, &lts, entries);
     66 	kernel_unlock_allbutone(&nlocks);
     67 
     68 	/* protected by biglock */
     69 	rumpuser_cv_wait(lts.cv, rump_giantlock);
     70 
     71 	LIST_REMOVE(&lts, entries);
     72 	rumpuser_cv_destroy(lts.cv);
     73 	kernel_ununlock_allbutone(nlocks);
     74 
     75 	if (slock && (prio & PNORELOCK) == 0)
     76 		simple_lock(slock);
     77 
     78 	return 0;
     79 }
     80 
     81 int
     82 mtsleep(wchan_t ident, pri_t prio, const char *wmesg, int timo,
     83 	kmutex_t *lock)
     84 {
     85 	struct ltsleeper lts;
     86 	int nlocks;
     87 
     88 	lts.id = ident;
     89 	rumpuser_cv_init(&lts.cv);
     90 
     91 	mutex_exit(lock);
     92 	LIST_INSERT_HEAD(&sleepers, &lts, entries);
     93 	kernel_unlock_allbutone(&nlocks);
     94 
     95 	/* protected by biglock */
     96 	rumpuser_cv_wait(lts.cv, rump_giantlock);
     97 
     98 	LIST_REMOVE(&lts, entries);
     99 	rumpuser_cv_destroy(lts.cv);
    100 	kernel_ununlock_allbutone(nlocks);
    101 
    102 	if ((prio & PNORELOCK) == 0)
    103 		mutex_enter(lock);
    104 
    105 	return 0;
    106 }
    107 
    108 static void
    109 do_wakeup(wchan_t ident, void (*wakeupfn)(struct rumpuser_cv *))
    110 {
    111 	struct ltsleeper *ltsp;
    112 
    113 	KASSERT(kernel_biglocked());
    114 	LIST_FOREACH(ltsp, &sleepers, entries) {
    115 		if (ltsp->id == ident) {
    116 			wakeupfn(ltsp->cv);
    117 		}
    118 	}
    119 }
    120 
    121 void
    122 wakeup(wchan_t ident)
    123 {
    124 
    125 	do_wakeup(ident, rumpuser_cv_broadcast);
    126 }
    127 
    128 void
    129 wakeup_one(wchan_t ident)
    130 {
    131 
    132 	do_wakeup(ident, rumpuser_cv_signal);
    133 }
    134 
    135 void
    136 rump_sleepers_init(void)
    137 {
    138 
    139 }
    140