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 */ 34 35 #include <stdio.h> 36 37 #include "spinlock.h" 38 39 long _atomic_lock_stub(volatile long *); 40 void _spinlock_stub(spinlock_t *); 41 int _spintrylock_stub(spinlock_t *); 42 void _spinunlock_stub(spinlock_t *); 43 void _spinlock_debug_stub(spinlock_t *, char *, int); 44 45 /* 46 * This function is a stub for the _atomic_lock function in libpthread. 47 */ 48 long 49 _atomic_lock_stub(volatile long *lck __unused) 50 { 51 return (0L); 52 } 53 54 /* 55 * This function is a stub for the spinlock function in libpthread. 56 */ 57 void 58 _spinlock_stub(spinlock_t *lck __unused) 59 { 60 } 61 62 /* 63 * This function is a stub for the spinunlock function in libpthread. 64 */ 65 void 66 _spinunlock_stub(spinlock_t *lck __unused) 67 { 68 } 69 70 /* 71 * This function is a stub for the spintrylock function in libpthread. 72 * Return 0 on success, non-zero on failure. 73 */ 74 int 75 _spintrylock_stub(spinlock_t *lck __unused) 76 { 77 return(0); 78 } 79 80 /* 81 * This function is a stub for the debug spinlock function in libpthread. 82 */ 83 void 84 _spinlock_debug_stub(spinlock_t *lck __unused, char *fname __unused, 85 int lineno __unused) 86 { 87 } 88 89 /* 90 * Declare weak definitions in case the application is not linked 91 * with libpthread. 92 */ 93 __weak_reference(_atomic_lock_stub,_atomic_lock); 94 __weak_reference(_spinlock_stub,_spinlock); 95 __weak_reference(_spintrylock_stub,_spintrylock); 96 __weak_reference(_spinunlock_stub,_spinunlock); 97 __weak_reference(_spinlock_debug_stub,_spinlock_debug); 98