module/os/freebsd/zfs/event_os.c

   1 /*
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2022 Rob Wing
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/param.h>
  29 #include <sys/lock.h>
  30 #include <sys/sx.h>
  31 #include <sys/event.h>
  32
  33 #include <sys/freebsd_event.h>
  34
  35 static void
  36 knlist_sx_xlock(void *arg)
  37 {
  38
  39         sx_xlock((struct sx *)arg);
  40 }
  41
  42 static void
  43 knlist_sx_xunlock(void *arg)
  44 {
  45
  46         sx_xunlock((struct sx *)arg);
  47 }
  48
  49 static void
  50 knlist_sx_assert_lock(void *arg, int what)
  51 {
  52
  53         if (what == LA_LOCKED)
  54                 sx_assert((struct sx *)arg, SX_LOCKED);
  55         else
  56                 sx_assert((struct sx *)arg, SX_UNLOCKED);
  57 }
  58
  59 void
  60 knlist_init_sx(struct knlist *knl, struct sx *lock)
  61 {
  62         knlist_init(knl, lock, knlist_sx_xlock, knlist_sx_xunlock,
  63             knlist_sx_assert_lock);
  64 }