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/gen/_spinlock_stub.c,v 1.4 1999/08/27 23:58:27 peter Exp $ 33 * $DragonFly: src/lib/libc/gen/_spinlock_stub.c,v 1.6 2005/04/26 10:08:41 joerg Exp $ 34 * 35 */ 36 37 #include <stdio.h> 38 39 /* Don't build these stubs into libc_r: */ 40 #include "spinlock.h" 41 42 long _atomic_lock_stub(volatile long *); 43 void _spinlock_stub(spinlock_t *); 44 int _spintrylock_stub(spinlock_t *); 45 void _spinunlock_stub(spinlock_t *); 46 void _spinlock_debug_stub(spinlock_t *, char *, int); 47 48 /* 49 * Declare weak definitions in case the application is not linked 50 * with libpthread. 51 */ 52 __weak_reference(_atomic_lock_stub,_atomic_lock); 53 __weak_reference(_spinlock_stub,_spinlock); 54 __weak_reference(_spintrylock_stub,_spintrylock); 55 __weak_reference(_spinunlock_stub,_spinunlock); 56 __weak_reference(_spinlock_debug_stub,_spinlock_debug); 57 58 /* 59 * This function is a stub for the _atomic_lock function in libpthread. 60 */ 61 long 62 _atomic_lock_stub(volatile long *lck __unused) 63 { 64 return (0L); 65 } 66 67 /* 68 * This function is a stub for the spinlock function in libpthread. 69 */ 70 void 71 _spinlock_stub(spinlock_t *lck __unused) 72 { 73 } 74 75 /* 76 * This function is a stub for the spinunlock function in libpthread. 77 */ 78 void 79 _spinunlock_stub(spinlock_t *lck __unused) 80 { 81 } 82 83 /* 84 * This function is a stub for the spintrylock function in libpthread. 85 * Return 0 on success, non-zero on failure. 86 */ 87 int 88 _spintrylock_stub(spinlock_t *lck __unused) 89 { 90 return(0); 91 } 92 93 /* 94 * This function is a stub for the debug spinlock function in libpthread. 95 */ 96 void 97 _spinlock_debug_stub(spinlock_t *lck __unused, char *fname __unused, 98 int lineno __unused) 99 { 100 } 101