4 # Copyright (c) 2013 Peter Holm <pho@FreeBSD.org>
7 # Redistribution and use in source and binary forms, with or without
8 # modification, are permitted provided that the following conditions
10 # 1. Redistributions of source code must retain the above copyright
11 # notice, this list of conditions and the following disclaimer.
12 # 2. Redistributions in binary form must reproduce the above copyright
13 # notice, this list of conditions and the following disclaimer in the
14 # documentation and/or other materials provided with the distribution.
16 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 # ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 # Test scenario by kib@
30 # Demonstrate process looping in kernel mode.
38 sed '1,/^EOF/d' < $odir/$0 > $dir/rwlock_ronly.c
39 mycc -o rwlock_ronly -Wall -Wextra rwlock_ronly.c || exit 1
43 /tmp/rwlock_ronly || echo OK
45 rm -f /tmp/rwlock_ronly
49 /* $Id: rwlock_ronly.c,v 1.2 2013/06/10 04:44:08 kostik Exp kostik $ */
51 #include <sys/types.h>
65 p = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE,
66 MAP_SHARED | MAP_ANON, -1, 0);
67 if (p == (char *)MAP_FAILED)
70 rw = (struct urwlock *)p;
71 rw->rw_state = URWLOCK_READ_WAITERS;
73 error = mprotect(p, getpagesize(), PROT_READ);
77 error = _umtx_op(p, UMTX_OP_RW_RDLOCK, 0, NULL, NULL);