netdev-offload-tc: Use single 'once' variable for probing tc features

[mirror_ovs.git] / lib / guarded-list.h

/*
 * Copyright (c) 2013 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.
 */

#ifndef GUARDED_LIST_H
#define GUARDED_LIST_H 1

#include <stddef.h>
#include "compiler.h"
#include "openvswitch/list.h"
#include "ovs-thread.h"

struct guarded_list {
    struct ovs_mutex mutex;
    struct ovs_list list;
    size_t n;
};

#define GUARDED_OVS_LIST_INITIALIZER(LIST) { \
    .mutex = OVS_MUTEX_INITIALIZER, \
    .list = OVS_LIST_INITIALIZER(&((LIST)->list)), \
    .n = 0 }

void guarded_list_init(struct guarded_list *);
void guarded_list_destroy(struct guarded_list *);

bool guarded_list_is_empty(const struct guarded_list *);

size_t guarded_list_push_back(struct guarded_list *, struct ovs_list *,
                              size_t max);
struct ovs_list *guarded_list_pop_front(struct guarded_list *);
size_t guarded_list_pop_all(struct guarded_list *, struct ovs_list *);

#endif /* guarded-list.h */