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
40 #include <libc_private.h>
42 #include "pthread_private.h"
45 _spinunlock(spinlock_t *lck)
51 * Lock a location for the running thread. Yield to allow other
52 * threads to run if this thread is blocked because the lock is
53 * not available. Note that this function does not sleep. It
54 * assumes that the lock will be available very soon.
57 _spinlock(spinlock_t *lck)
59 struct pthread *curthread = _get_curthread();
62 * Try to grab the lock and loop if another thread grabs
65 while(_atomic_lock(&lck->access_lock)) {
66 /* Block the thread until the lock. */
67 curthread->data.spinlock = lck;
68 _thread_kern_sched_state(PS_SPINBLOCK, __FILE__, __LINE__);
71 /* The running thread now owns the lock: */
72 lck->lock_owner = (long) curthread;
76 * Lock a location for the running thread. Yield to allow other
77 * threads to run if this thread is blocked because the lock is
78 * not available. Note that this function does not sleep. It
79 * assumes that the lock will be available very soon.
81 * This function checks if the running thread has already locked the
82 * location, warns if this occurs and creates a thread dump before
86 _spinlock_debug(spinlock_t *lck, char *fname, int lineno)
88 struct pthread *curthread = _get_curthread();
92 * Try to grab the lock and loop if another thread grabs
95 while(_atomic_lock(&lck->access_lock)) {
99 snprintf(str, sizeof(str), "%s - Warning: Thread %p attempted to lock %p from %s (%d) was left locked from %s (%d)\n", getprogname(), curthread, lck, fname, lineno, lck->fname, lck->lineno);
100 __sys_write(2,str,strlen(str));
105 /* Block the thread until the lock. */
106 curthread->data.spinlock = lck;
107 _thread_kern_sched_state(PS_SPINBLOCK, fname, lineno);
110 /* The running thread now owns the lock: */
111 lck->lock_owner = (long) curthread;
113 lck->lineno = lineno;