diff options
Diffstat (limited to 'lib/libkse/thread/thr_spinlock.c')
| -rw-r--r-- | lib/libkse/thread/thr_spinlock.c | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/lib/libkse/thread/thr_spinlock.c b/lib/libkse/thread/thr_spinlock.c deleted file mode 100644 index 685301f..0000000 --- a/lib/libkse/thread/thr_spinlock.c +++ /dev/null @@ -1,155 +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. 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 AUTHOR 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. - * - * $FreeBSD$ - * - */ - -#include "namespace.h" -#include <sys/types.h> -#include <machine/atomic.h> -#include <pthread.h> -#include <libc_private.h> -#include "un-namespace.h" -#include "spinlock.h" -#include "thr_private.h" - -#define MAX_SPINLOCKS 72 - -struct spinlock_extra { - spinlock_t *owner; - pthread_mutex_t lock; -}; - -struct nv_spinlock { - long access_lock; - long lock_owner; - struct spinlock_extra *extra; /* overlays fname in spinlock_t */ - int lineno; -}; -typedef struct nv_spinlock nv_spinlock_t; - -static void init_spinlock(spinlock_t *lck); - -static struct pthread_mutex_attr static_mutex_attr = - PTHREAD_MUTEXATTR_STATIC_INITIALIZER; -static pthread_mutexattr_t static_mattr = &static_mutex_attr; - -static pthread_mutex_t spinlock_static_lock; -static struct spinlock_extra extra[MAX_SPINLOCKS]; -static int spinlock_count = 0; -static int initialized = 0; - -/* - * These are for compatability only. Spinlocks of this type - * are deprecated. - */ - -void -_spinunlock(spinlock_t *lck) -{ - struct spinlock_extra *sl_extra; - - sl_extra = ((nv_spinlock_t *)lck)->extra; - _pthread_mutex_unlock(&sl_extra->lock); -} - -/* - * 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) -{ - struct spinlock_extra *sl_extra; - - if (!__isthreaded) - PANIC("Spinlock called when not threaded."); - if (!initialized) - PANIC("Spinlocks not initialized."); - /* - * Try to grab the lock and loop if another thread grabs - * it before we do. - */ - if (lck->fname == NULL) - init_spinlock(lck); - sl_extra = ((nv_spinlock_t *)lck)->extra; - _pthread_mutex_lock(&sl_extra->lock); -} - -/* - * 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 __unused, int lineno __unused) -{ - _spinlock(lck); -} - -static void -init_spinlock(spinlock_t *lck) -{ - _pthread_mutex_lock(&spinlock_static_lock); - if ((lck->fname == NULL) && (spinlock_count < MAX_SPINLOCKS)) { - lck->fname = (char *)&extra[spinlock_count]; - extra[spinlock_count].owner = lck; - spinlock_count++; - } - _pthread_mutex_unlock(&spinlock_static_lock); - if (lck->fname == NULL) - PANIC("Exceeded max spinlocks"); -} - -void -_thr_spinlock_init(void) -{ - int i; - - if (initialized != 0) { - _thr_mutex_reinit(&spinlock_static_lock); - for (i = 0; i < spinlock_count; i++) - _thr_mutex_reinit(&extra[i].lock); - } else { - if (_pthread_mutex_init(&spinlock_static_lock, &static_mattr)) - PANIC("Cannot initialize spinlock_static_lock"); - for (i = 0; i < MAX_SPINLOCKS; i++) { - if (_pthread_mutex_init(&extra[i].lock, &static_mattr)) - PANIC("Cannot initialize spinlock extra"); - } - initialized = 1; - } -} |
