2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the author nor the names of any co-contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/types.h>
37 #include <libc_private.h>
40 #include "thr_private.h"
42 #define MAX_SPINLOCKS 72
45 * These data structures are used to trace all spinlocks
48 struct spinlock_extra {
53 static struct umutex spinlock_static_lock = DEFAULT_UMUTEX;
54 static struct spinlock_extra extra[MAX_SPINLOCKS];
55 static int spinlock_count;
56 static int initialized;
58 static void init_spinlock(spinlock_t *lck);
61 * These are for compatability only. Spinlocks of this type
66 __thr_spinunlock(spinlock_t *lck)
68 struct spinlock_extra *_extra;
70 _extra = lck->thr_extra;
71 THR_UMUTEX_UNLOCK(_get_curthread(), &_extra->lock);
75 __thr_spinlock(spinlock_t *lck)
77 struct spinlock_extra *_extra;
80 PANIC("Spinlock called when not threaded.");
82 PANIC("Spinlocks not initialized.");
83 if (lck->thr_extra == NULL)
85 _extra = lck->thr_extra;
86 THR_UMUTEX_LOCK(_get_curthread(), &_extra->lock);
90 init_spinlock(spinlock_t *lck)
92 struct pthread *curthread = _get_curthread();
94 THR_UMUTEX_LOCK(curthread, &spinlock_static_lock);
95 if ((lck->thr_extra == NULL) && (spinlock_count < MAX_SPINLOCKS)) {
96 lck->thr_extra = &extra[spinlock_count];
97 _thr_umutex_init(&extra[spinlock_count].lock);
98 extra[spinlock_count].owner = lck;
101 THR_UMUTEX_UNLOCK(curthread, &spinlock_static_lock);
102 if (lck->thr_extra == NULL)
103 PANIC("Warning: exceeded max spinlocks");
107 _thr_spinlock_init(void)
111 _thr_umutex_init(&spinlock_static_lock);
112 if (initialized != 0) {
114 * called after fork() to reset state of libc spin locks,
115 * it is not quite right since libc may be in inconsistent
116 * state, resetting the locks to allow current thread to be
117 * able to hold them may not help things too much, but
118 * anyway, we do our best.
119 * it is better to do pthread_atfork in libc.
121 for (i = 0; i < spinlock_count; i++)
122 _thr_umutex_init(&extra[i].lock);