123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#ifndef __GUAC_LIST_H
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#define __GUAC_LIST_H
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#include "config.h"
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#include <pthread.h>
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/**
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* Generic linked list element.
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*/
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typedef struct guac_common_list_element guac_common_list_element;
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struct guac_common_list_element {
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/**
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* The next element in the list, or NULL if none.
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*/
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guac_common_list_element* next;
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/**
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* Generic data.
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*/
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void* data;
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/**
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* The pointer which points to this element, whether another element's
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* next pointer, or the entire list's head pointer.
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*/
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guac_common_list_element** _ptr;
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};
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/**
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* Generic linked list.
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*/
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typedef struct guac_common_list {
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/**
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* The first element in the list.
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*/
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guac_common_list_element* head;
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/**
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* Mutex which is locked when exclusive access to the list is required.
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* Possession of the lock is not enforced outside the
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* guac_common_list_lock() function.
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*/
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pthread_mutex_t _lock;
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} guac_common_list;
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/**
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* Creates a new list.
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*
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* @return A newly-allocated list.
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*/
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guac_common_list* guac_common_list_alloc();
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/**
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* Frees the given list.
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*
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* @param list The list to free.
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*/
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void guac_common_list_free(guac_common_list* list);
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/**
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* Adds the given data to the list as a new element, returning the created
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* element.
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*
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* @param list The list to add an element to.
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* @param data The data to associate with the newly-created element.
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* @param The newly-created element.
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*/
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guac_common_list_element* guac_common_list_add(guac_common_list* list,
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void* data);
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/**
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* Removes the given element from the list.
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*
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* @param list The list to remove the element from.
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* @param element The element to remove.
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*/
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void guac_common_list_remove(guac_common_list* list,
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guac_common_list_element* element);
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/**
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* Acquires exclusive access to the list. No list functions implicitly lock or
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* unlock the list, so any list access which must be threadsafe must use
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* guac_common_list_lock() and guac_common_list_unlock() manually.
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*
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* @param list The list to acquire exclusive access to.
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*/
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void guac_common_list_lock(guac_common_list* list);
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/**
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* Releases exclusive access to the list.
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*
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* @param list The list to release from exclusive access.
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*/
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void guac_common_list_unlock(guac_common_list* list);
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#endif
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