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 * $Id: spinlock.h,v 1.8 2003/01/31 04:46:17 marc Exp $ 33 * $OpenBSD: spinlock.h,v 1.8 2003/01/31 04:46:17 marc 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 #include <machine/spinlock.h> 44 45 /* 46 * Lock structure with room for debugging information. 47 */ 48 typedef volatile struct { 49 _spinlock_lock_t access_lock; 50 void * lock_owner; 51 const char * fname; 52 int lineno; 53 } spinlock_t; 54 55 #define _SPINLOCK_INITIALIZER { _SPINLOCK_UNLOCKED, 0, 0, 0 } 56 57 #define _SPINUNLOCK(_lck) (_lck)->access_lock = _SPINLOCK_UNLOCKED 58 #ifdef _LOCK_DEBUG 59 #define _SPINLOCK(_lck) _spinlock_debug(_lck, __FILE__, __LINE__) 60 #else 61 #define _SPINLOCK(_lck) _spinlock(_lck) 62 #endif 63 64 #define _SPINLOCK_INIT(_lck) _SPINUNLOCK(_lck) 65 66 /* 67 * Thread function prototype definitions: 68 */ 69 __BEGIN_DECLS 70 void _spinlock(spinlock_t *); 71 void _spinlock_debug(spinlock_t *, const char *, int); 72 73 /* lock() functions return 0 if lock was acquired. */ 74 /* is_locked functions() return 1 if lock is locked. */ 75 int _atomic_lock(volatile _spinlock_lock_t *); 76 int _atomic_is_locked(volatile _spinlock_lock_t *); 77 __END_DECLS 78 79 #endif /* _SPINLOCK_H_ */ 80