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: src/lib/libc/include/spinlock.h,v 1.4 1999/08/27 23:59:48 peter Exp $ 33 * $DragonFly: src/lib/libc/include/spinlock.h,v 1.4 2005/01/31 22:29:29 dillon Exp $ 34 * 35 * Lock definitions used in both libc and libpthread. 36 * 37 */ 38 39 #ifndef _SPINLOCK_H_ 40 #define _SPINLOCK_H_ 41 #include <sys/cdefs.h> 42 #include <sys/types.h> 43 44 /* 45 * Lock structure with room for debugging information. 46 */ 47 typedef struct { 48 volatile long access_lock; 49 volatile long lock_owner; 50 volatile char *fname; 51 volatile int lineno; 52 } spinlock_t; 53 54 #define _SPINLOCK_INITIALIZER { 0, 0, 0, 0 } 55 56 #define _SPINUNLOCK(_lck) _spinunlock(_lck) 57 #ifdef _LOCK_DEBUG 58 #define _SPINLOCK(_lck) _spinlock_debug(_lck, __FILE__, __LINE__) 59 #else 60 #define _SPINLOCK(_lck) _spinlock(_lck) 61 #endif 62 #define _SPINTRYLOCK(_lck) _spintrylock(_lck) 63 64 /* 65 * Thread function prototype definitions: 66 */ 67 __BEGIN_DECLS 68 long _atomic_lock (volatile long *); 69 void _spinlock (spinlock_t *); 70 int _spintrylock (spinlock_t *); 71 void _spinlock_debug (spinlock_t *, char *, int); 72 void _spinunlock (spinlock_t *); 73 __END_DECLS 74 75 #endif /* _SPINLOCK_H_ */ 76