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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2002 The Apache Software Foundation. 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. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
#include "apr.h"
#include "apr_lock.h"
#include "apr_thread_mutex.h"
#include "apr_atomic.h"
#if APR_HAS_THREADS
#if defined(APR_ATOMIC_NEED_DEFAULT) || defined(APR_ATOMIC_NEED_CAS_DEFAULT)
#define NUM_ATOMIC_HASH 7
/* shift by 2 to get rid of alignment issues */
#define ATOMIC_HASH(x) (int)(((long)x>>2)%NUM_ATOMIC_HASH)
static apr_thread_mutex_t **hash_mutex;
apr_status_t apr_atomic_init(apr_pool_t *p )
{
int i;
apr_status_t rv;
hash_mutex =apr_palloc(p,sizeof(apr_thread_mutex_t*) * NUM_ATOMIC_HASH);
for (i=0;i<NUM_ATOMIC_HASH;i++) {
rv = apr_thread_mutex_create(&(hash_mutex[i]), APR_THREAD_MUTEX_DEFAULT, p);
if (rv != APR_SUCCESS)
return rv;
}
return APR_SUCCESS;
}
#endif /* APR_ATOMIC_NEED_DEFAULT || APR_ATOMIC_NEED_CAS_DEFAULT */
#if defined(APR_ATOMIC_NEED_DEFAULT)
void apr_atomic_add(volatile apr_atomic_t *mem, apr_uint32_t val)
{
apr_thread_mutex_t *lock = hash_mutex[ATOMIC_HASH(mem)];
apr_uint32_t prev;
if (apr_thread_mutex_lock(lock) == APR_SUCCESS) {
prev = *mem;
*mem += val;
apr_thread_mutex_unlock(lock);
/* return prev; */
}
printf("debug no workee\n");
/* return *mem; */
}
void apr_atomic_set(volatile apr_atomic_t *mem, apr_uint32_t val)
{
apr_thread_mutex_t *lock = hash_mutex[ATOMIC_HASH(mem)];
apr_uint32_t prev;
if (apr_thread_mutex_lock(lock) == APR_SUCCESS) {
prev = *mem;
*mem = val;
apr_thread_mutex_unlock(lock);
/* return prev; */
}
/* return *mem; */
}
void apr_atomic_inc( volatile apr_uint32_t *mem)
{
apr_thread_mutex_t *lock = hash_mutex[ATOMIC_HASH(mem)];
apr_uint32_t prev;
if (apr_thread_mutex_lock(lock) == APR_SUCCESS) {
prev = *mem;
(*mem)++;
apr_thread_mutex_unlock(lock);
/* return prev; */
}
/* return *mem; */
}
void apr_atomic_dec(volatile apr_atomic_t *mem)
{
apr_thread_mutex_t *lock = hash_mutex[ATOMIC_HASH(mem)];
apr_uint32_t prev;
if (apr_thread_mutex_lock(lock) == APR_SUCCESS) {
prev = *mem;
(*mem)--;
apr_thread_mutex_unlock(lock);
/* return prev; */
}
/* return *mem; */
}
#endif /* APR_ATOMIC_NEED_DEFAULT */
#if defined(APR_ATOMIC_NEED_CAS_DEFAULT)
apr_uint32_t apr_atomic_cas(volatile apr_uint32_t *mem,long with, long cmp)
{
apr_thread_mutex_t *lock = hash_mutex[ATOMIC_HASH(mem)];
long prev;
if (apr_thread_mutex_lock(lock) == APR_SUCCESS) {
prev = *(long*)mem;
if ( prev == cmp) {
*(long*)mem = with;
}
apr_thread_mutex_unlock(lock);
return prev;
}
return *(long*)mem;
}
#endif /* APR_ATOMIC_NEED_CAS_DEFAULT */
#endif /* APR_HAS_THREADS */
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