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/*
* Copyright (c) 2013, 2014 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "ovs-atomic.h"
#include "hash.h"
#include "ovs-thread.h"
#ifdef OVS_ATOMIC_LOCKED_IMPL
static struct ovs_mutex *
mutex_for_pointer(void *p)
{
OVS_ALIGNED_STRUCT(CACHE_LINE_SIZE, aligned_mutex) {
struct ovs_mutex mutex;
char pad[PAD_SIZE(sizeof(struct ovs_mutex), CACHE_LINE_SIZE)];
};
static struct aligned_mutex atomic_mutexes[] = {
#define MUTEX_INIT { .mutex = OVS_MUTEX_INITIALIZER }
#define MUTEX_INIT4 MUTEX_INIT, MUTEX_INIT, MUTEX_INIT, MUTEX_INIT
#define MUTEX_INIT16 MUTEX_INIT4, MUTEX_INIT4, MUTEX_INIT4, MUTEX_INIT4
MUTEX_INIT16, MUTEX_INIT16,
};
BUILD_ASSERT_DECL(IS_POW2(ARRAY_SIZE(atomic_mutexes)));
uint32_t hash = hash_pointer(p, 0);
uint32_t indx = hash & (ARRAY_SIZE(atomic_mutexes) - 1);
return &atomic_mutexes[indx].mutex;
}
void
atomic_lock__(void *p)
OVS_ACQUIRES(mutex_for_pointer(p))
{
ovs_mutex_lock(mutex_for_pointer(p));
}
void
atomic_unlock__(void *p)
OVS_RELEASES(mutex_for_pointer(p))
{
ovs_mutex_unlock(mutex_for_pointer(p));
}
#endif /* OVS_ATOMIC_LOCKED_IMPL */
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