spinlock.h revision 112665
1/* 2 * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by John Birrell. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD: head/lib/libc/include/spinlock.h 112665 2003-03-26 04:02:24Z jeff $ 33 * 34 * Lock definitions used in both libc and libpthread. 35 * 36 */ 37 38#ifndef _SPINLOCK_H_ 39#define _SPINLOCK_H_ 40#include <sys/cdefs.h> 41#include <sys/types.h> 42 43/* 44 * Lock structure with room for debugging information. 45 */ 46typedef struct { 47 volatile long access_lock; 48 volatile long lock_owner; 49 volatile char *fname; 50 volatile int lineno; 51} spinlock_t; 52 53#define _SPINLOCK_INITIALIZER { 0, 0, 0, 0 } 54 55#define _SPINUNLOCK(_lck) _spinunlock(_lck); 56#ifdef _LOCK_DEBUG 57#define _SPINLOCK(_lck) _spinlock_debug(_lck, __FILE__, __LINE__) 58#else 59#define _SPINLOCK(_lck) _spinlock(_lck) 60#endif 61 62/* 63 * Thread function prototype definitions: 64 */ 65__BEGIN_DECLS 66long _atomic_lock(volatile long *); 67void _spinlock(spinlock_t *); 68void _spinunlock(spinlock_t *); 69void _spinlock_debug(spinlock_t *, char *, int); 70__END_DECLS 71 72#endif /* _SPINLOCK_H_ */ 73