Subversion Repositories HelenOS

Rev

Rev 4588 | Go to most recent revision | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

  1. /*
  2.  * Copyright (c) 2009 Lukas Mejdrech
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup net
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  Dynamic first in first out positive integer queue.
  35.  *  Possitive integer values only.
  36.  */
  37.  
  38. #ifndef __NET_DYNAMIC_FIFO_H__
  39. #define __NET_DYNAMIC_FIFO_H__
  40.  
  41. /** Type definition of the dynamic fifo queue.
  42.  *  @see dyn_fifo
  43.  */
  44. typedef struct dyn_fifo dyn_fifo_t;
  45.  
  46. /** Type definition of the dynamic fifo queue pointer.
  47.  *  @see dyn_fifo
  48.  */
  49. typedef dyn_fifo_t *    dyn_fifo_ref;
  50.  
  51. /** Dynamic first in first out positive integer queue.
  52.  *  Possitive integer values only.
  53.  *  The queue automatically resizes if needed.
  54.  */
  55. struct dyn_fifo{
  56.     /** Stored item field.
  57.      */
  58.     int *   items;
  59.     /** Actual field size.
  60.      */
  61.     int     size;
  62.     /** First item in the queue index.
  63.      */
  64.     int     head;
  65.     /** Last item in the queue index.
  66.      */
  67.     int     tail;
  68.     /** Consistency check magic value.
  69.      */
  70.     int     magic_value;
  71. };
  72.  
  73. /** Initializes the dynamic queue.
  74.  *  @param fifo The dynamic queue. Input/output parameter.
  75.  *  @param size The initial queue size. Input parameter.
  76.  *  @returns EOK on success.
  77.  *  @returns EINVAL if the queue is not valid.
  78.  *  @returns EBADMEM if the fifo parameter is NULL.
  79.  *  @returns ENOMEM if there is not enough memory left.
  80.  */
  81. int dyn_fifo_initialize( dyn_fifo_ref fifo, int size );
  82.  
  83. /** Appends a new item to the queue end.
  84.  *  @param fifo The dynamic queue. Input/output parameter.
  85.  *  @param value The new item value. Should be positive. Input parameter.
  86.  *  @param max_size The maximum queue size. The queue is not resized beyound this limit. May be zero or negative (<=0) to indicate no limit. Input parameter.
  87.  *  @returns EOK on success.
  88.  *  @returns EINVAL if the queue is not valid.
  89.  *  @returns ENOMEM if there is not enough memory left.
  90.  */
  91. int dyn_fifo_push( dyn_fifo_ref fifo, int value, int max_size );
  92.  
  93. /** Returns and excludes the first item in the queue.
  94.  *  @param fifo The dynamic queue. Input/output parameter.
  95.  *  @returns Value of the first item in the queue.
  96.  *  @returns EINVAL if the queue is not valid.
  97.  *  @returns ENOENT if the queue is empty.
  98.  */
  99. int dyn_fifo_pop( dyn_fifo_ref fifo );
  100.  
  101. /** Returns and keeps the first item in the queue.
  102.  *  @param fifo The dynamic queue. Input/output parameter.
  103.  *  @returns Value of the first item in the queue.
  104.  *  @returns EINVAL if the queue is not valid.
  105.  *  @returns ENOENT if the queue is empty.
  106.  */
  107. int dyn_fifo_value( dyn_fifo_ref fifo );
  108.  
  109. /** Clears and destroys the queue.
  110.  *  @param fifo The dynamic queue. Input/output parameter.
  111.  *  @returns EOK on success.
  112.  *  @returns EINVAL if the queue is not valid.
  113.  */
  114. int dyn_fifo_destroy( dyn_fifo_ref fifo );
  115.  
  116. #endif
  117.  
  118. /** @}
  119.  */
  120.