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Diffstat (limited to 'sys/sys/lock.h')
| -rw-r--r-- | sys/sys/lock.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/sys/sys/lock.h b/sys/sys/lock.h new file mode 100644 index 0000000..2388b59 --- /dev/null +++ b/sys/sys/lock.h @@ -0,0 +1,55 @@ +/* $OpenBSD: lock.h,v 1.27 2016/06/19 11:54:33 natano Exp $ */ + +/* + * Copyright (c) 1995 + * The Regents of the University of California. All rights reserved. + * + * This code contains ideas from software contributed to Berkeley by + * Avadis Tevanian, Jr., Michael Wayne Young, and the Mach Operating + * System project at Carnegie-Mellon University. + * + * 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. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. + * + * @(#)lock.h 8.12 (Berkeley) 5/19/95 + */ + +#ifndef _LOCK_H_ +#define _LOCK_H_ + +#include <sys/rwlock.h> + +#define LK_EXCLUSIVE RW_WRITE /* exclusive lock */ +#define LK_SHARED RW_READ /* shared lock */ +#define LK_TYPE_MASK (RW_WRITE|RW_READ) /* type of lock sought */ +#define LK_NOWAIT RW_NOSLEEP /* do not sleep to await lock */ +#define LK_RECURSEFAIL RW_RECURSEFAIL /* fail if recursive exclusive lock */ +#define LK_EXCLOTHER RW_WRITE_OTHER /* exclusive lock held by some other thread */ +#define LK_RWFLAGS (RW_WRITE|RW_READ|RW_NOSLEEP|RW_RECURSEFAIL|RW_WRITE_OTHER) + +/* LK_ specific */ +#define LK_DRAIN 0x1000UL /* wait for all lock activity to end */ +#define LK_RETRY 0x2000UL /* vn_lock: retry until locked */ + +#endif /* !_LOCK_H_ */ |