1 files changed, 0 insertions, 379 deletions
diff --git a/lib/libc_r/uthread/uthread_rwlock.c b/lib/libc_r/uthread/uthread_rwlock.c
deleted file mode 100644
index fdda04c..0000000
--- a/lib/libc_r/uthread/uthread_rwlock.c
+++ /dev/null
@@ -1,379 +0,0 @@
-/*-
- * Copyright (c) 1998 Alex Nash
- * 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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 <errno.h>
-#include <limits.h>
-#include <stdlib.h>
-
-#include "namespace.h"
-#include <pthread.h>
-#include "un-namespace.h"
-
-#include "pthread_private.h"
-
-/* maximum number of times a read lock may be obtained */
-#define	MAX_READ_LOCKS		(INT_MAX - 1)
-
-__weak_reference(_pthread_rwlock_destroy, pthread_rwlock_destroy);
-__weak_reference(_pthread_rwlock_init, pthread_rwlock_init);
-__weak_reference(_pthread_rwlock_rdlock, pthread_rwlock_rdlock);
-__weak_reference(_pthread_rwlock_tryrdlock, pthread_rwlock_tryrdlock);
-__weak_reference(_pthread_rwlock_trywrlock, pthread_rwlock_trywrlock);
-__weak_reference(_pthread_rwlock_unlock, pthread_rwlock_unlock);
-__weak_reference(_pthread_rwlock_wrlock, pthread_rwlock_wrlock);
-
-static int init_static (pthread_rwlock_t *rwlock);
-
-static spinlock_t static_init_lock = _SPINLOCK_INITIALIZER;
-
-static int
-init_static (pthread_rwlock_t *rwlock)
-{
-	int ret;
-
-	_SPINLOCK(&static_init_lock);
-
-	if (*rwlock == NULL)
-		ret = _pthread_rwlock_init(rwlock, NULL);
-	else
-		ret = 0;
-
-	_SPINUNLOCK(&static_init_lock);
-
-	return (ret);
-}
-
-int
-_pthread_rwlock_destroy (pthread_rwlock_t *rwlock)
-{
-	int ret;
-
-	if (rwlock == NULL)
-		ret = EINVAL;
-	else {
-		pthread_rwlock_t prwlock;
-
-		prwlock = *rwlock;
-
-		_pthread_mutex_destroy(&prwlock->lock);
-		_pthread_cond_destroy(&prwlock->read_signal);
-		_pthread_cond_destroy(&prwlock->write_signal);
-		free(prwlock);
-
-		*rwlock = NULL;
-
-		ret = 0;
-	}
-	return (ret);
-}
-
-int
-_pthread_rwlock_init (pthread_rwlock_t *rwlock, const pthread_rwlockattr_t *attr)
-{
-	pthread_rwlock_t prwlock;
-	int ret;
-
-	/* allocate rwlock object */
-	prwlock = (pthread_rwlock_t)malloc(sizeof(struct pthread_rwlock));
-
-	if (prwlock == NULL)
-		return(ENOMEM);
-
-	/* initialize the lock */
-	if ((ret = _pthread_mutex_init(&prwlock->lock, NULL)) != 0)
-		free(prwlock);
-	else {
-		/* initialize the read condition signal */
-		ret = _pthread_cond_init(&prwlock->read_signal, NULL);
-
-		if (ret != 0) {
-			_pthread_mutex_destroy(&prwlock->lock);
-			free(prwlock);
-		} else {
-			/* initialize the write condition signal */
-			ret = _pthread_cond_init(&prwlock->write_signal, NULL);
-
-			if (ret != 0) {
-				_pthread_cond_destroy(&prwlock->read_signal);
-				_pthread_mutex_destroy(&prwlock->lock);
-				free(prwlock);
-			} else {
-				/* success */
-				prwlock->state = 0;
-				prwlock->blocked_writers = 0;
-
-				*rwlock = prwlock;
-			}
-		}
-	}
-
-	return (ret);
-}
-
-int
-_pthread_rwlock_rdlock (pthread_rwlock_t *rwlock)
-{
-	pthread_rwlock_t prwlock;
-	struct pthread *curthread;
-	int ret;
-
-	if (rwlock == NULL)
-		return(EINVAL);
-
-	prwlock = *rwlock;
-
-	/* check for static initialization */
-	if (prwlock == NULL) {
-		if ((ret = init_static(rwlock)) != 0)
-			return(ret);
-
-		prwlock = *rwlock;
-	}
-
-	/* grab the monitor lock */
-	if ((ret = _pthread_mutex_lock(&prwlock->lock)) != 0)
-		return(ret);
-
-	/* check lock count */
-	if (prwlock->state == MAX_READ_LOCKS) {
-		_pthread_mutex_unlock(&prwlock->lock);
-		return (EAGAIN);
-	}
-
-	curthread = _get_curthread();
-	if ((curthread->rdlock_count > 0) && (prwlock->state > 0)) {
-		/*
-		 * To avoid having to track all the rdlocks held by
-		 * a thread or all of the threads that hold a rdlock,
-		 * we keep a simple count of all the rdlocks held by
-		 * a thread.  If a thread holds any rdlocks it is
-		 * possible that it is attempting to take a recursive
-		 * rdlock.  If there are blocked writers and precedence
-		 * is given to them, then that would result in the thread
-		 * deadlocking.  So allowing a thread to take the rdlock
-		 * when it already has one or more rdlocks avoids the
-		 * deadlock.  I hope the reader can follow that logic ;-)
-		 */
-		;	/* nothing needed */
-	} else {
-		/* give writers priority over readers */
-		while (prwlock->blocked_writers || prwlock->state < 0) {
-			ret = _pthread_cond_wait(&prwlock->read_signal,
-			    &prwlock->lock);
-
-			if (ret != 0) {
-				/* can't do a whole lot if this fails */
-				_pthread_mutex_unlock(&prwlock->lock);
-				return(ret);
-			}
-		}
-	}
-
-	curthread->rdlock_count++;
-	prwlock->state++; /* indicate we are locked for reading */
-
-	/*
-	 * Something is really wrong if this call fails.  Returning
-	 * error won't do because we've already obtained the read
-	 * lock.  Decrementing 'state' is no good because we probably
-	 * don't have the monitor lock.
-	 */
-	_pthread_mutex_unlock(&prwlock->lock);
-
-	return (ret);
-}
-
-int
-_pthread_rwlock_tryrdlock (pthread_rwlock_t *rwlock)
-{
-	pthread_rwlock_t prwlock;
-	struct pthread *curthread;
-	int ret;
-
-	if (rwlock == NULL)
-		return(EINVAL);
-
-	prwlock = *rwlock;
-
-	/* check for static initialization */
-	if (prwlock == NULL) {
-		if ((ret = init_static(rwlock)) != 0)
-			return(ret);
-
-		prwlock = *rwlock;
-	}
-
-	/* grab the monitor lock */
-	if ((ret = _pthread_mutex_lock(&prwlock->lock)) != 0)
-		return(ret);
-
-	curthread = _get_curthread();
-	if (prwlock->state == MAX_READ_LOCKS)
-		ret = EAGAIN; /* too many read locks acquired */
-	else if ((curthread->rdlock_count > 0) && (prwlock->state > 0)) {
-		/* see comment for pthread_rwlock_rdlock() */
-		curthread->rdlock_count++;
-		prwlock->state++;
-	}
-	/* give writers priority over readers */
-	else if (prwlock->blocked_writers || prwlock->state < 0)
-		ret = EBUSY;
-	else {
-		prwlock->state++; /* indicate we are locked for reading */
-		curthread->rdlock_count++;
-	}
-
-	/* see the comment on this in pthread_rwlock_rdlock */
-	_pthread_mutex_unlock(&prwlock->lock);
-
-	return (ret);
-}
-
-int
-_pthread_rwlock_trywrlock (pthread_rwlock_t *rwlock)
-{
-	pthread_rwlock_t prwlock;
-	int ret;
-
-	if (rwlock == NULL)
-		return(EINVAL);
-
-	prwlock = *rwlock;
-
-	/* check for static initialization */
-	if (prwlock == NULL) {
-		if ((ret = init_static(rwlock)) != 0)
-			return(ret);
-
-		prwlock = *rwlock;
-	}
-
-	/* grab the monitor lock */
-	if ((ret = _pthread_mutex_lock(&prwlock->lock)) != 0)
-		return(ret);
-
-	if (prwlock->state != 0)
-		ret = EBUSY;
-	else
-		/* indicate we are locked for writing */
-		prwlock->state = -1;
-
-	/* see the comment on this in pthread_rwlock_rdlock */
-	_pthread_mutex_unlock(&prwlock->lock);
-
-	return (ret);
-}
-
-int
-_pthread_rwlock_unlock (pthread_rwlock_t *rwlock)
-{
-	pthread_rwlock_t prwlock;
-	struct pthread *curthread;
-	int ret;
-
-	if (rwlock == NULL)
-		return(EINVAL);
-
-	prwlock = *rwlock;
-
-	if (prwlock == NULL)
-		return(EINVAL);
-
-	/* grab the monitor lock */
-	if ((ret = _pthread_mutex_lock(&prwlock->lock)) != 0)
-		return(ret);
-
-	curthread = _get_curthread();
-	if (prwlock->state > 0) {
-		curthread->rdlock_count--;
-		prwlock->state--;
-		if (prwlock->state == 0 && prwlock->blocked_writers)
-			ret = _pthread_cond_signal(&prwlock->write_signal);
-	} else if (prwlock->state < 0) {
-		prwlock->state = 0;
-
-		if (prwlock->blocked_writers)
-			ret = _pthread_cond_signal(&prwlock->write_signal);
-		else
-			ret = _pthread_cond_broadcast(&prwlock->read_signal);
-	} else
-		ret = EINVAL;
-
-	/* see the comment on this in pthread_rwlock_rdlock */
-	_pthread_mutex_unlock(&prwlock->lock);
-
-	return (ret);
-}
-
-int
-_pthread_rwlock_wrlock (pthread_rwlock_t *rwlock)
-{
-	pthread_rwlock_t prwlock;
-	int ret;
-
-	if (rwlock == NULL)
-		return(EINVAL);
-
-	prwlock = *rwlock;
-
-	/* check for static initialization */
-	if (prwlock == NULL) {
-		if ((ret = init_static(rwlock)) != 0)
-			return(ret);
-
-		prwlock = *rwlock;
-	}
-
-	/* grab the monitor lock */
-	if ((ret = _pthread_mutex_lock(&prwlock->lock)) != 0)
-		return(ret);
-
-	while (prwlock->state != 0) {
-		prwlock->blocked_writers++;
-
-		ret = _pthread_cond_wait(&prwlock->write_signal,
-		    &prwlock->lock);
-
-		if (ret != 0) {
-			prwlock->blocked_writers--;
-			_pthread_mutex_unlock(&prwlock->lock);
-			return(ret);
-		}
-
-		prwlock->blocked_writers--;
-	}
-
-	/* indicate we are locked for writing */
-	prwlock->state = -1;
-
-	/* see the comment on this in pthread_rwlock_rdlock */
-	_pthread_mutex_unlock(&prwlock->lock);
-
-	return (ret);
-}
-