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ltsleep.c revision 1.3 
      1 /*	$NetBSD: ltsleep.c,v 1.3 2007/11/07 18:59:18 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 
     35 #include "rump_private.h"
     36 #include "rumpuser.h"
     37 
     38 struct ltsleeper {
     39 	wchan_t id;
     40 	kcondvar_t cv;
     41 	LIST_ENTRY(ltsleeper) entries;
     42 };
     43 
     44 static LIST_HEAD(, ltsleeper) sleepers = LIST_HEAD_INITIALIZER(sleepers);
     45 static kmutex_t sleepermtx;
     46 
     47 int
     48 ltsleep(wchan_t ident, pri_t prio, const char *wmesg, int timo,
     49 	volatile struct simplelock *slock)
     50 {
     51 	struct ltsleeper lts;
     52 	int iplrecurse;
     53 
     54 	lts.id = ident;
     55 	cv_init(&lts.cv, NULL);
     56 
     57 	mutex_enter(&sleepermtx);
     58 	LIST_INSERT_HEAD(&sleepers, &lts, entries);
     59 
     60 	/* release spl */
     61 	iplrecurse = rumpuser_whatis_ipl();
     62 	while (iplrecurse--)
     63 		rumpuser_rw_exit(&rumpspl);
     64 
     65 	/* protected by sleepermtx */
     66 	if (slock)
     67 		simple_unlock(slock);
     68 	cv_wait(&lts.cv, &sleepermtx);
     69 
     70 	/* retake ipl */
     71 	iplrecurse = rumpuser_whatis_ipl();
     72 	while (iplrecurse--)
     73 		rumpuser_rw_enter(&rumpspl, 0);
     74 
     75 	LIST_REMOVE(&lts, entries);
     76 	mutex_exit(&sleepermtx);
     77 
     78 	cv_destroy(&lts.cv);
     79 
     80 	if (slock && (prio & PNORELOCK) == 0)
     81 		simple_lock(slock);
     82 
     83 	return 0;
     84 }
     85 
     86 void
     87 wakeup(wchan_t ident)
     88 {
     89 	struct ltsleeper *ltsp;
     90 
     91 	mutex_enter(&sleepermtx);
     92 	LIST_FOREACH(ltsp, &sleepers, entries)
     93 		if (ltsp->id == ident)
     94 			cv_signal(&ltsp->cv);
     95 	mutex_exit(&sleepermtx);
     96 }
     97 
     98 void
     99 rump_sleepers_init()
    100 {
    101 
    102 	mutex_init(&sleepermtx, MUTEX_DEFAULT, 0);
    103 }
    104