lib/libc/gen/_spinlock_stub.c

   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 }