mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-05 16:39:31 +00:00
f2caf6f548
functions. The application header <sys/user.h> includes <vm/vm.h> which includes <vm/lock.h>... vm.h: Don't include <machine/cpufunc.h>. It is already included by <sys/systm.h> in the kernel and isn't designed to be included by applications (the 2.1 version causes a syntax error in C++ and the current version has initializers that are invalid in strict C++). lock.h: Only declare kernel functions if KERNEL is defined.
118 lines
4.6 KiB
C
118 lines
4.6 KiB
C
/*
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. 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.
|
|
*
|
|
* from: @(#)lock.h 8.1 (Berkeley) 6/11/93
|
|
*
|
|
*
|
|
* Copyright (c) 1987, 1990 Carnegie-Mellon University.
|
|
* All rights reserved.
|
|
*
|
|
* Authors: Avadis Tevanian, Jr., Michael Wayne Young
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and
|
|
* its documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation.
|
|
*
|
|
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
|
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
|
|
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
|
*
|
|
* Carnegie Mellon requests users of this software to return to
|
|
*
|
|
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
|
* School of Computer Science
|
|
* Carnegie Mellon University
|
|
* Pittsburgh PA 15213-3890
|
|
*
|
|
* any improvements or extensions that they make and grant Carnegie the
|
|
* rights to redistribute these changes.
|
|
*
|
|
* $Id: lock.h,v 1.4 1995/07/13 08:48:14 davidg Exp $
|
|
*/
|
|
|
|
/*
|
|
* Locking primitives definitions
|
|
*/
|
|
|
|
#ifndef _LOCK_H_
|
|
#define _LOCK_H_
|
|
|
|
/*
|
|
* The general lock structure. Provides for multiple readers,
|
|
* upgrading from read to write, and sleeping until the lock
|
|
* can be gained.
|
|
*/
|
|
struct lock {
|
|
/*
|
|
* Only the "interlock" field is used for hardware exclusion; other
|
|
* fields are modified with normal instructions after acquiring the
|
|
* interlock bit.
|
|
*/
|
|
boolean_t want_write; /* Writer is waiting, or locked for write */
|
|
boolean_t want_upgrade; /* Read-to-write upgrade waiting */
|
|
boolean_t waiting; /* Someone is sleeping on lock */
|
|
boolean_t can_sleep; /* Can attempts to lock go to sleep */
|
|
int read_count; /* Number of accepted readers */
|
|
struct proc *proc; /* If recursive locking, process that has lock */
|
|
int recursion_depth; /* Depth of recursion */
|
|
};
|
|
|
|
typedef struct lock lock_data_t;
|
|
typedef struct lock *lock_t;
|
|
|
|
/* Sleep locks must work even if no multiprocessing. */
|
|
|
|
#define lock_read_done(l) lock_done(l)
|
|
#define lock_write_done(l) lock_done(l)
|
|
|
|
#ifdef KERNEL
|
|
void lock_clear_recursive __P((lock_t));
|
|
void lock_done __P((lock_t));
|
|
void lock_init __P((lock_t, boolean_t));
|
|
void lock_read __P((lock_t));
|
|
boolean_t lock_read_to_write __P((lock_t));
|
|
void lock_set_recursive __P((lock_t));
|
|
void lock_sleepable __P((lock_t, boolean_t));
|
|
boolean_t lock_try_read __P((lock_t));
|
|
boolean_t lock_try_read_to_write __P((lock_t));
|
|
boolean_t lock_try_write __P((lock_t));
|
|
void lock_write __P((lock_t));
|
|
void lock_write_to_read __P((lock_t));
|
|
#endif
|
|
|
|
#endif /* !_LOCK_H_ */
|