xref: /freebsd-10-stable/sys/geom/uzip/g_uzip_wrkthr.c

/*-
 * Copyright (c) 2006-2016 Maxim Sobolev <sobomax@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/types.h>
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/bio.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/sched.h>
#include <sys/kthread.h>
#include <sys/malloc.h>

#include <geom/uzip/g_uzip.h>
#include <geom/uzip/g_uzip_softc.h>
#include <geom/uzip/g_uzip_wrkthr.h>

void
g_uzip_wrkthr(void *arg)
{
	struct g_uzip_softc *sc;
	struct bio *bp;

	sc = (struct g_uzip_softc *)arg;
	thread_lock(curthread);
	sched_prio(curthread, PRIBIO);
	thread_unlock(curthread);

	for (;;) {
		mtx_lock(&sc->queue_mtx);
		if (sc->wrkthr_flags & GUZ_SHUTDOWN) {
			sc->wrkthr_flags |= GUZ_EXITING;
			mtx_unlock(&sc->queue_mtx);
			kproc_exit(0);
		}
		bp = bioq_takefirst(&sc->bio_queue);
		if (!bp) {
			msleep(sc, &sc->queue_mtx, PRIBIO | PDROP,
			    "wrkwait", 0);
			continue;
		}
		mtx_unlock(&sc->queue_mtx);
		sc->uzip_do(sc, bp);
	}
}