95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
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/* $NetBSD: busypage.c,v 1.5 2011/08/07 14:03:15 rmind Exp $ */
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/*-
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* Copyright (c) 2010 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
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* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if !defined(lint)
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__RCSID("$NetBSD: busypage.c,v 1.5 2011/08/07 14:03:15 rmind Exp $");
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#endif /* !lint */
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#include <sys/param.h>
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#include <sys/condvar.h>
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#include <sys/kthread.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <uvm/uvm.h>
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#include "kernspace.h"
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static struct uvm_object *uobj;
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static struct vm_page *testpg;
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static kcondvar_t tcv;
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static bool threadrun = false;
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static void
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thread(void *arg)
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{
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mutex_enter(uobj->vmobjlock);
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threadrun = true;
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cv_signal(&tcv);
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testpg->flags |= PG_WANTED;
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UVM_UNLOCK_AND_WAIT(testpg, uobj->vmobjlock, false, "tw", 0);
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kthread_exit(0);
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}
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void
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rumptest_busypage()
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{
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struct lwp *newl;
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int rv;
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cv_init(&tcv, "napina");
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uobj = uao_create(1, 0);
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mutex_enter(uobj->vmobjlock);
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testpg = uvm_pagealloc(uobj, 0, NULL, 0);
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mutex_exit(uobj->vmobjlock);
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if (testpg == NULL)
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panic("couldn't create vm page");
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rv = kthread_create(PRI_NONE, KTHREAD_MUSTJOIN | KTHREAD_MPSAFE, NULL,
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thread, NULL, &newl, "jointest");
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if (rv)
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panic("thread creation failed: %d", rv);
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mutex_enter(uobj->vmobjlock);
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while (!threadrun)
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cv_wait(&tcv, uobj->vmobjlock);
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uvm_page_unbusy(&testpg, 1);
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mutex_exit(uobj->vmobjlock);
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rv = kthread_join(newl);
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if (rv)
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panic("thread join failed: %d", rv);
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}
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