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 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <stdio.h> 34 35 #include "spinlock.h" 36 #include "libc_private.h" 37 38 long _atomic_lock_stub(volatile long *); 39 void _spinlock_stub(spinlock_t *); 40 void _spinunlock_stub(spinlock_t *); 41 42 __weak_reference(_atomic_lock_stub, _atomic_lock); 43 44 long 45 _atomic_lock_stub(volatile long *lck __unused) 46 { 47 return (0L); 48 } 49 50 #pragma weak _spinlock 51 void 52 _spinlock(spinlock_t *lck) 53 { 54 55 ((void (*)(spinlock_t *lck))__libc_interposing[INTERPOS_spinlock]) 56 (lck); 57 58 } 59 60 #pragma weak _spinunlock 61 void 62 _spinunlock(spinlock_t *lck) 63 { 64 65 ((void (*)(spinlock_t *lck))__libc_interposing[INTERPOS_spinunlock]) 66 (lck); 67 68 } 69 70 void 71 __libc_spinlock_stub(spinlock_t *lck __unused) 72 { 73 } 74 75 void 76 __libc_spinunlock_stub(spinlock_t *lck __unused) 77 { 78 } 79