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
_atomic_lock_stub(volatile long * lck __unused)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
_spinlock_stub(spinlock_t * lck __unused)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
_spinunlock_stub(spinlock_t * lck __unused)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
_spintrylock_stub(spinlock_t * lck __unused)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
_spinlock_debug_stub(spinlock_t * lck __unused,char * fname __unused,int lineno __unused)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