diff options
Diffstat (limited to 'lib/libpthread/thread/thr_spinlock.c')
| -rw-r--r-- | lib/libpthread/thread/thr_spinlock.c | 108 |
1 files changed, 0 insertions, 108 deletions
diff --git a/lib/libpthread/thread/thr_spinlock.c b/lib/libpthread/thread/thr_spinlock.c deleted file mode 100644 index 9da115e5eedb..000000000000 --- a/lib/libpthread/thread/thr_spinlock.c +++ /dev/null @@ -1,108 +0,0 @@ -/* - * Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by John Birrell. - * 4. Neither the name of the author nor the names of any co-contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $Id: uthread_spinlock.c,v 1.3 1998/06/06 07:27:06 jb Exp $ - * - */ - -#include <stdio.h> -#include <sched.h> -#include <unistd.h> -#include <pthread.h> -#include <string.h> -#include "pthread_private.h" - -extern char *__progname; - -/* - * Lock a location for the running thread. Yield to allow other - * threads to run if this thread is blocked because the lock is - * not available. Note that this function does not sleep. It - * assumes that the lock will be available very soon. - */ -void -_spinlock(spinlock_t *lck) -{ - /* - * Try to grab the lock and loop if another thread grabs - * it before we do. - */ - while(_atomic_lock(&lck->access_lock)) { - /* Give up the time slice: */ - sched_yield(); - - /* Check if already locked by the running thread: */ - if (lck->lock_owner == (long) _thread_run) - return; - } - - /* The running thread now owns the lock: */ - lck->lock_owner = (long) _thread_run; -} - -/* - * Lock a location for the running thread. Yield to allow other - * threads to run if this thread is blocked because the lock is - * not available. Note that this function does not sleep. It - * assumes that the lock will be available very soon. - * - * This function checks if the running thread has already locked the - * location, warns if this occurs and creates a thread dump before - * returning. - */ -void -_spinlock_debug(spinlock_t *lck, char *fname, int lineno) -{ - /* - * Try to grab the lock and loop if another thread grabs - * it before we do. - */ - while(_atomic_lock(&lck->access_lock)) { - /* Give up the time slice: */ - sched_yield(); - - /* Check if already locked by the running thread: */ - if (lck->lock_owner == (long) _thread_run) { - char str[256]; - snprintf(str, sizeof(str), "%s - Warning: Thread %p attempted to lock %p from %s (%d) which it had already locked in %s (%d)\n", __progname, _thread_run, lck, fname, lineno, lck->fname, lck->lineno); - _thread_sys_write(2,str,strlen(str)); - - /* Create a thread dump to help debug this problem: */ - _thread_dump_info(); - return; - } - } - - /* The running thread now owns the lock: */ - lck->lock_owner = (long) _thread_run; - lck->fname = fname; - lck->lineno = lineno; -} |