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. Neither the name of the author nor the names of any co-contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 * 31 * Lock definitions used in both libc and libpthread. 32 * 33 */ 34 35 #ifndef _SPINLOCK_H_ 36 #define _SPINLOCK_H_ 37 #include <sys/cdefs.h> 38 #include <sys/types.h> 39 40 /* 41 * Lock structure with room for debugging information. 42 */ 43 struct _spinlock { 44 volatile long access_lock; 45 volatile long lock_owner; 46 volatile char *fname; 47 volatile int lineno; 48 }; 49 typedef struct _spinlock spinlock_t; 50 51 #define _SPINLOCK_INITIALIZER { 0, 0, 0, 0 } 52 53 #define _SPINUNLOCK(_lck) _spinunlock(_lck); 54 #ifdef _LOCK_DEBUG 55 #define _SPINLOCK(_lck) _spinlock_debug(_lck, __FILE__, __LINE__) 56 #else 57 #define _SPINLOCK(_lck) _spinlock(_lck) 58 #endif 59 60 /* 61 * Thread function prototype definitions: 62 */ 63 __BEGIN_DECLS 64 long _atomic_lock(volatile long *); 65 void _spinlock(spinlock_t *); 66 void _spinunlock(spinlock_t *); 67 void _spinlock_debug(spinlock_t *, char *, int); 68 __END_DECLS 69 70 #endif /* _SPINLOCK_H_ */ 71