thodg/libgit2/src/pqueue.h

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• Hash : 931b8b70
  Author :
  Date : 2013-01-03T22:16:37
  

  Add Apache license header back to libpqueue files The original libpqueue file were licensed under Apache 2.0 so therefore should retain their copyrights and header as per the license terms at http://www.apache.org/licenses/LICENSE-2.0

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• src/pqueue.h

• /*
   * Copyright (C) 2009-2013 the libgit2 contributors
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   * 
   * This file is based on a modified version of the priority queue found
   * in the Apache project and libpqueue library.
   * 
   * https://github.com/vy/libpqueue
   * 
   * Original file notice:
   * 
   * Copyright 2010 Volkan Yazici <volkan.yazici@gmail.com>
   * Copyright 2006-2010 The Apache Software Foundation
   *
   * 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 INCLUDE_pqueue_h__
  #define INCLUDE_pqueue_h__
  
  /** callback functions to get/set/compare the priority of an element */
  typedef int (*git_pqueue_cmp)(void *a, void *b);
  
  /** the priority queue handle */
  typedef struct {
  	size_t size, avail, step;
  	git_pqueue_cmp cmppri;
  	void **d;
  } git_pqueue;
  
  
  /**
   * initialize the queue
   *
   * @param n the initial estimate of the number of queue items for which memory
   *			should be preallocated
   * @param cmppri the callback function to compare two nodes of the queue
   *
   * @Return the handle or NULL for insufficent memory
   */
  int git_pqueue_init(git_pqueue *q, size_t n, git_pqueue_cmp cmppri);
  
  
  /**
   * free all memory used by the queue
   * @param q the queue
   */
  void git_pqueue_free(git_pqueue *q);
  
  /**
   * clear all the elements in the queue
   * @param q the queue
   */
  void git_pqueue_clear(git_pqueue *q);
  
  /**
   * return the size of the queue.
   * @param q the queue
   */
  size_t git_pqueue_size(git_pqueue *q);
  
  
  /**
   * insert an item into the queue.
   * @param q the queue
   * @param d the item
   * @return 0 on success
   */
  int git_pqueue_insert(git_pqueue *q, void *d);
  
  
  /**
   * pop the highest-ranking item from the queue.
   * @param p the queue
   * @param d where to copy the entry to
   * @return NULL on error, otherwise the entry
   */
  void *git_pqueue_pop(git_pqueue *q);
  
  
  /**
   * access highest-ranking item without removing it.
   * @param q the queue
   * @param d the entry
   * @return NULL on error, otherwise the entry
   */
  void *git_pqueue_peek(git_pqueue *q);
  
  #endif /* PQUEUE_H */
  /** @} */
  
  

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