2 * Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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 AUTHOR 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
33 #include <sys/types.h>
35 #include <libc_private.h>
38 #include "thr_private.h"
40 #define MAX_SPINLOCKS 72
43 * These data structures are used to trace all spinlocks
46 struct spinlock_extra {
51 static struct umutex spinlock_static_lock = DEFAULT_UMUTEX;
52 static struct spinlock_extra extra[MAX_SPINLOCKS];
53 static int spinlock_count;
54 static int initialized;
56 static void init_spinlock(spinlock_t *lck);
59 * These are for compatability only. Spinlocks of this type
64 _spinunlock(spinlock_t *lck)
66 struct spinlock_extra *_extra;
68 _extra = (struct spinlock_extra *)lck->fname;
69 THR_UMUTEX_UNLOCK(_get_curthread(), &_extra->lock);
73 _spinlock(spinlock_t *lck)
75 struct spinlock_extra *_extra;
78 PANIC("Spinlock called when not threaded.");
80 PANIC("Spinlocks not initialized.");
81 if (lck->fname == NULL)
83 _extra = (struct spinlock_extra *)lck->fname;
84 THR_UMUTEX_LOCK(_get_curthread(), &_extra->lock);
88 _spinlock_debug(spinlock_t *lck, char *fname __unused, int lineno __unused)
94 init_spinlock(spinlock_t *lck)
96 struct pthread *curthread = _get_curthread();
98 THR_UMUTEX_LOCK(curthread, &spinlock_static_lock);
99 if ((lck->fname == NULL) && (spinlock_count < MAX_SPINLOCKS)) {
100 lck->fname = (char *)&extra[spinlock_count];
101 _thr_umutex_init(&extra[spinlock_count].lock);
102 extra[spinlock_count].owner = lck;
105 THR_UMUTEX_UNLOCK(curthread, &spinlock_static_lock);
106 if (lck->fname == NULL)
107 PANIC("Warning: exceeded max spinlocks");
111 _thr_spinlock_init(void)
115 _thr_umutex_init(&spinlock_static_lock);
116 if (initialized != 0) {
118 * called after fork() to reset state of libc spin locks,
119 * it is not quite right since libc may be in inconsistent
120 * state, resetting the locks to allow current thread to be
121 * able to hold them may not help things too much, but
122 * anyway, we do our best.
123 * it is better to do pthread_atfork in libc.
125 for (i = 0; i < spinlock_count; i++)
126 _thr_umutex_init(&extra[i].lock);