模仿kfifo实现的环形缓冲区

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* @8 r: |- Z2 H( X6 J转载来源：模仿kfifo实现的环形缓冲区
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GitHub仓库：http://github.com/XinLiGitHub/RingBuffer
5 i- I* p& ^& e' FPS：博文不再更新，后续更新会在GitHub仓库进行。
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    模仿kfifo实现的环形缓冲区。程序中涉及到环形缓冲区的概念，详细介绍见维基百科[Circular buffer](http://en.wikipedia.org/wiki/Circular_buffer)。
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! @: X9 U  E0 d) D, e1，开发环境
1 O2 T7 W: r5 J& @8 N3 q, y3 Z      1，操作系统：Windows 10 专业版
* I& {* `, V4 f; V      2，IDE：Visual Studio 2015 专业版
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* d8 v% @& y' D2 F0 u  g2，程序源码
      RingBuffer.h文件

1. /**
   
2.   ******************************************************************************
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3.   * @file    RingBuffer.h
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4.   * @author  XinLi
   
5.   * @version v1.0
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6.   * @date    15-January-2018
   2 I) C* K- d# Y" n5 s: D- w
7.   * @brief   Header file for RingBuffer.c module.
   
8.   ******************************************************************************
     `! Z3 M! \1 N, e, _
9.   * @attention
   
10.   *
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11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
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12.   *
    
13.   * This program is free software: you can redistribute it and/or modify
    + H- Y6 ^/ j/ g" x  W: ~4 e: a- E9 S
14.   * it under the terms of the GNU General Public License as published by
    
15.   * the Free Software Foundation, either version 3 of the License, or
    
16.   * (at your option) any later version.
    * G/ ^7 E; k( H! w( A
17.   *
    - ]% }, ]# C# D- e/ G* p$ }7 k
18.   * This program is distributed in the hope that it will be useful,
    
19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    
20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    
21.   * GNU General Public License for more details.
    ( i. o9 n; n) {; h& v" u! q
22.   *
    # I" b  L! D2 [" l8 U; _
23.   * You should have received a copy of the GNU General Public License
    
24.   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
25.   *
    % Y0 Y7 S5 y; B2 R9 B. b( W6 g
26.   ******************************************************************************
    
27.   */
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28. 
    
29. #ifndef __RINGBUFFER_H
    
30. #define __RINGBUFFER_H
    
31. 
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32. #ifdef __cplusplus
    
33. extern "C" {
    
34. #endif
    
35. 
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36. /* Header includes -----------------------------------------------------------*/
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37. #include <stdint.h>
    
38. #include <stdbool.h>
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39. 
    
40. /* Macro definitions ---------------------------------------------------------*/
    
41. #define RING_BUFFER_MALLOC(size)  malloc(size)
    
42. #define RING_BUFFER_FREE(block)   free(block)
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43. 
    
44. /* Type definitions ----------------------------------------------------------*/
    
45. typedef struct
    
46. {
    
47.   uint8_t *buffer;
    
48.   uint32_t size;
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49.   uint32_t in;
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50.   uint32_t out;
    
51. }RingBuffer;
    
52. 
    
53. /* Variable declarations -----------------------------------------------------*/
    
54. /* Variable definitions ------------------------------------------------------*/
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55. /* Function declarations -----------------------------------------------------*/
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56. RingBuffer *RingBuffer_Malloc(uint32_t size);
    " y7 C' W1 }4 V5 t: {
57. void RingBuffer_Free(RingBuffer *fifo);
    
58. uint32_t RingBuffer_In(RingBuffer *fifo, void *in, uint32_t len);
    
59. uint32_t RingBuffer_Out(RingBuffer *fifo, void *out, uint32_t len);
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60. 
      [/ l1 u' C. _# n/ }' m1 r9 L
61. /* Function definitions ------------------------------------------------------*/
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62. 
    
63. /**
    
64.   * @brief  Removes the entire FIFO contents.
    
65.   * @param  [in] fifo: The fifo to be emptied.
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66.   * @return None.
    
67.   */
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68. static inline void RingBuffer_Reset(RingBuffer *fifo)
    
69. {
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70.   fifo->in = fifo->out = 0;
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71. }
    
72. 
    
73. /**
    
74.   * @brief  Returns the size of the FIFO in bytes.
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75.   * @param  [in] fifo: The fifo to be used.
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76.   * @return The size of the FIFO.
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77.   */
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78. static inline uint32_t RingBuffer_Size(RingBuffer *fifo)
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79. {
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80.   return fifo->size;
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81. }
    
82. 
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83. /**
    
84.   * @brief  Returns the number of used bytes in the FIFO.
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85.   * @param  [in] fifo: The fifo to be used.
    
86.   * @return The number of used bytes.
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87.   */
    
88. static inline uint32_t RingBuffer_Len(RingBuffer *fifo)
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89. {
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90.   return fifo->in - fifo->out;
    
91. }
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92. 
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93. /**
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94.   * @brief  Returns the number of bytes available in the FIFO.
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95.   * @param  [in] fifo: The fifo to be used.
    
96.   * @return The number of bytes available.
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97.   */
    
98. static inline uint32_t RingBuffer_Avail(RingBuffer *fifo)
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99. {
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100.   return RingBuffer_Size(fifo) - RingBuffer_Len(fifo);
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101. }
     
102. 
     
103. /**
     
104.   * @brief  Is the FIFO empty?
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105.   * @param  [in] fifo: The fifo to be used.
     
106.   * @retval true:      Yes.
     
107.   * @retval false:     No.
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108.   */
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109. static inline bool RingBuffer_IsEmpty(RingBuffer *fifo)
     
110. {
     
111.   return RingBuffer_Len(fifo) == 0;
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112. }
     
113. 
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114. /**
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115.   * @brief  Is the FIFO full?
     
116.   * @param  [in] fifo: The fifo to be used.
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117.   * @retval true:      Yes.
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118.   * @retval false:     No.
     
119.   */
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120. static inline bool RingBuffer_IsFull(RingBuffer *fifo)
     
121. {
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122.   return RingBuffer_Avail(fifo) == 0;
     
123. }
     
124. 
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125. #ifdef __cplusplus
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126. }
     
127. #endif
     
128. 
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129. #endif /* __RINGBUFFER_H */
     

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2 C9 w9 v+ W5 X; Q' w      RingBuffer.c文件

1. /**
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2.   ******************************************************************************
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3.   * @file    RingBuffer.c
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4.   * @author  XinLi
   
5.   * @version v1.0
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6.   * @date    15-January-2018
   
7.   * @brief   Ring buffer module source file.
   
8.   ******************************************************************************
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9.   * @attention
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10.   *
    
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
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12.   *
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13.   * This program is free software: you can redistribute it and/or modify
    
14.   * it under the terms of the GNU General Public License as published by
    5 x. T7 L, P7 i; C  m- }) N/ u
15.   * the Free Software Foundation, either version 3 of the License, or
    ' E$ [7 e  t" @7 a5 [1 [( p
16.   * (at your option) any later version.
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17.   *
    
18.   * This program is distributed in the hope that it will be useful,
    / n  Y; H9 \# |$ P" [' n% y* |
19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    3 H2 }  {; ^5 D' Q: Z4 G
20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    0 Z- J& r  c( X, P3 U! C! R
21.   * GNU General Public License for more details.
    
22.   *
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23.   * You should have received a copy of the GNU General Public License
    
24.   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
25.   *
    
26.   ******************************************************************************
    
27.   */
    
28. 
    
29. /* Header includes -----------------------------------------------------------*/
    
30. #include "RingBuffer.h"
    
31. #include <stdlib.h>
    
32. #include <string.h>
    
33. 
    
34. /* Macro definitions ---------------------------------------------------------*/
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35. /* Type definitions ----------------------------------------------------------*/
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36. /* Variable declarations -----------------------------------------------------*/
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37. /* Variable definitions ------------------------------------------------------*/
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38. /* Function declarations -----------------------------------------------------*/
    
39. static bool is_power_of_2(uint32_t x);
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40. static uint32_t roundup_pow_of_two(uint32_t x);
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41. 
    
42. /* Function definitions ------------------------------------------------------*/
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43. 
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44. /**
    
45.   * @brief  Allocates a new FIFO and its internal buffer.
    
46.   * @param  [in] size: The size of the internal buffer to be allocated.
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47.   * @note   The size will be rounded-up to a power of 2.
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48.   * @return RingBuffer pointer.
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49.   */
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50. RingBuffer *RingBuffer_Malloc(uint32_t size)
    
51. {
    
52.   RingBuffer *fifo = RING_BUFFER_MALLOC(sizeof(RingBuffer));
    
53. 
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54.   if(fifo != NULL)
    
55.   {
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56.     if(is_power_of_2(size) != true)
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57.     {
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58.       if(size > 0x80000000UL)
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59.       {
    
60.         RING_BUFFER_FREE(fifo);
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61.         fifo = NULL;
    
62.         return fifo;
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63.       }
    
64. 
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65.       size = roundup_pow_of_two(size);
    
66.     }
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67. 
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68.     fifo->size   = size;
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69.     fifo->in     = 0;
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70.     fifo->out    = 0;
    
71.     fifo->buffer = RING_BUFFER_MALLOC(fifo->size);
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72. 
    0 U' U% ~# c$ r! g
73.     if(fifo->buffer == NULL)
    
74.     {
    
75.       RING_BUFFER_FREE(fifo);
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76.       fifo = NULL;
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77.       return fifo;
    
78.     }
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79.   }
    
80. 
    
81.   return fifo;
    
82. }
    
83. 
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84. /**
    
85.   * @brief  Frees the FIFO.
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86.   * @param  [in] fifo: The fifo to be freed.
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87.   * @return None.
    
88.   */
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89. void RingBuffer_Free(RingBuffer *fifo)
    
90. {
    
91.   RING_BUFFER_FREE(fifo->buffer);
    
92.   RING_BUFFER_FREE(fifo);
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93.   fifo = NULL;
    
94. }
    
95. 
    
96. /**
    
97.   * @brief  Puts some data into the FIFO.
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98.   * @param  [in] fifo: The fifo to be used.
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99.   * @param  [in] in:   The data to be added.
    
100.   * @param  [in] len:  The length of the data to be added.
     
101.   * @return The number of bytes copied.
     8 V, ^% l3 h2 I+ z
102.   * @note   This function copies at most @len bytes from the @in into
     , ~; n3 `0 `+ b/ w* }4 f9 `( n
103.   *         the FIFO depending on the free space, and returns the number
     
104.   *         of bytes copied.
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105.   */
     - V: f0 |! w3 }. @7 I8 f2 i
106. uint32_t RingBuffer_In(RingBuffer *fifo, void *in, uint32_t len)
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107. {
     
108.   len = min(len, RingBuffer_Avail(fifo));
     
109. 
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110.   /* First put the data starting from fifo->in to buffer end. */
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111.   uint32_t l = min(len, fifo->size - (fifo->in & (fifo->size - 1)));
     
112.   memcpy(fifo->buffer + (fifo->in & (fifo->size - 1)), in, l);
     
113. 
     
114.   /* Then put the rest (if any) at the beginning of the buffer. */
     
115.   memcpy(fifo->buffer, (uint8_t *)in + l, len - l);
     
116. 
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117.   fifo->in += len;
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118. 
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119.   return len;
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120. }
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121. 
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122. /**
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123.   * @brief  Gets some data from the FIFO.
     
124.   * @param  [in] fifo: The fifo to be used.
     
125.   * @param  [in] out:  Where the data must be copied.
     6 q: }/ n8 n3 O4 m9 @3 K
126.   * @param  [in] len:  The size of the destination buffer.
     & E. n4 [5 a, c! `
127.   * @return The number of copied bytes.
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128.   * @note   This function copies at most @len bytes from the FIFO into
     
129.   *         the @out and returns the number of copied bytes.
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130.   */
     
131. uint32_t RingBuffer_Out(RingBuffer *fifo, void *out, uint32_t len)
     
132. {
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133.   len = min(len, RingBuffer_Len(fifo));
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134. 
     
135.   /* First get the data from fifo->out until the end of the buffer. */
     
136.   uint32_t l = min(len, fifo->size - (fifo->out & (fifo->size - 1)));
       v0 H# @; b0 T/ \7 j3 e  {
137.   memcpy(out, fifo->buffer + (fifo->out & (fifo->size - 1)), l);
     
138. 
     
139.   /* Then get the rest (if any) from the beginning of the buffer. */
       Z, e' U/ U( x5 y; [1 v
140.   memcpy((uint8_t *)out + l, fifo->buffer, len - l);
     
141. 
     
142.   fifo->out += len;
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143. 
     . J& B( Z7 N8 ~! ^  x6 O: t
144.   return len;
     
145. }
     
146. 
     
147. /**
     
148.   * @brief  Determine whether some value is a power of two.
     
149.   * @param  [in] x: The number to be confirmed.
     
150.   * @retval true:   Yes.
     
151.   * @retval false:  No.
     
152.   * @note   Where zero is not considered a power of two.
     
153.   */
     
154. static bool is_power_of_2(uint32_t x)
     2 k1 j' A" \, [6 {, p
155. {
     
156.   return (x != 0) && ((x & (x - 1)) == 0);
     
157. }
     
158. 
     
159. /**
     # |. Z% }, F; e3 t
160.   * @brief  Round the given value up to nearest power of two.
     + E" h8 ?! @2 W; e5 l; F$ }
161.   * @param  [in] x: The number to be converted.
     ; r% U1 \* O7 b3 L" t# C9 q, S
162.   * @return The power of two.
     # X- F" s! p6 F% Z5 N* h
163.   */
     : R/ i/ L! @6 K7 U1 o
164. static uint32_t roundup_pow_of_two(uint32_t x)
     
165. {
     
166.   uint32_t b = 0;
     # u2 z' J# s% A# h( V; @$ b( y
167. 
     4 u: o3 k1 S/ p- P
168.   for(int i = 0; i < 32; i++)
     
169.   {
     5 g3 e- L$ R# r& W
170.     b = 1UL << i;
     
171. 
     
172.     if(x <= b)
     
173.     {
     ' _% n* Q# @8 S6 U
174.       break;
     
175.     }
     
176.   }
     
177. 
     5 N& O& r! V3 U3 H& l
178.   return b;
     
179. }
     

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      main.c文件
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1. /**
   
2.   ******************************************************************************
   2 U( g7 w/ K8 Q8 j
3.   * @file    main.c
   
4.   * @author  XinLi
   
5.   * @version v1.0
   
6.   * @date    15-January-2018
   2 N1 }% Q! Q: n) j4 w
7.   * @brief   Main program body.
   9 I, b) |& ]$ `& ^# c
8.   ******************************************************************************
   + p+ v, l, z- o/ [
9.   * @attention
   6 {( c! v. i" s7 I  J" b2 ]4 q
10.   *
    8 I5 k* q# e( \* D( S
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
    & C/ @( G' I/ Y( b+ a
12.   *
    
13.   * This program is free software: you can redistribute it and/or modify
    
14.   * it under the terms of the GNU General Public License as published by
    - ?* n" f. c. @- \1 K$ A
15.   * the Free Software Foundation, either version 3 of the License, or
    
16.   * (at your option) any later version.
    * i# P; ?0 n  s9 e* h
17.   *
    
18.   * This program is distributed in the hope that it will be useful,
    
19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    
20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    $ J8 V/ X6 N3 ^3 I. F
21.   * GNU General Public License for more details.
    0 K) i" c6 T7 C# r  G8 C+ T8 b
22.   *
    
23.   * You should have received a copy of the GNU General Public License
    8 C2 D; I, k; |% u# Q% L2 P0 p
24.   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    ( d2 ?) {. N' s5 d
25.   *
    
26.   ******************************************************************************
    $ i6 J" P$ F8 L1 Q, {
27.   */
    1 s) ^# T4 ?( i+ [+ W8 X( F
28. 
    2 z1 \! s9 b% r& M- F/ N
29. /* Header includes -----------------------------------------------------------*/
    
30. #include "RingBuffer.h"
    & Y' x& X3 U1 {0 o0 n* d! u* v
31. #include <stdio.h>
    
32. #include <windows.h>
    2 a9 N' P# Z/ H2 k6 W8 K+ b  N
33. 
    
34. /* Macro definitions ---------------------------------------------------------*/
    
35. /* Type definitions ----------------------------------------------------------*/
    
36. /* Variable declarations -----------------------------------------------------*/
    
37. /* Variable definitions ------------------------------------------------------*/
    
38. /* Function declarations -----------------------------------------------------*/
    & G8 w/ P! J% v$ ^
39. /* Function definitions ------------------------------------------------------*/
    # m* H" H' i6 G) J
40. 
    
41. /**
    ! d! _' l7 X  T! n9 B. w  s9 ^( q
42.   * @brief  Main program.
    8 _- s8 ^0 s: J0 h3 Z7 x
43.   * @param  None.
    
44.   * @return None.
    8 P5 j7 t8 `% s4 [$ i8 P3 a- L# G
45.   */
    
46. int main(void)
    ' Z8 V& W  h; w$ T3 i& l9 l
47. {
    
48.   uint8_t data[256] = {0};
    . h: Y0 Z, P9 N! f% n
49. 
    ( k, g7 s( n: U: h( S
50.   for(int i = 0; i < sizeof(data); i++)
    # M( v) h  G+ D+ r% r1 T3 o
51.   {
    7 @4 V# G+ z  n) }" W4 N  r, `- Q
52.     data[i] = i;
    ; |2 {3 j" }) e% b7 Q# p5 H
53.   }
    ( H% A, m% E& r( g  q& E
54. 
    
55.   RingBuffer *fifo = RingBuffer_Malloc(sizeof(data));
    
56. 
      m9 n+ R6 t" U& F1 \
57.   if(fifo != NULL)
    
58.   {
    3 _7 c5 Z, |! @; Y/ o0 U
59.     printf("FIFO创建成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
    
60.            RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
    
61. 
    5 C& b4 ~! n; C: R
62.     if(RingBuffer_IsFull(fifo) == true)
    * r: ]8 [* R( i3 h9 w. X* ]
63.     {
    
64.       printf("FIFO满了！！！\n");
    
65.     }
    
66.     else
    6 b6 h+ B8 z2 }/ J2 P; f  v6 E
67.     {
    4 J+ i1 p5 x7 {8 c9 O1 E) c  e. |3 _
68.       printf("FIFO没满！！！\n");
    
69.     }
    
70. 
    & `" w" R2 n! B& n2 q% E" R* z
71.     if(RingBuffer_IsEmpty(fifo) == true)
    , n  p9 Z$ a$ R  |$ f% V% V
72.     {
    
73.       printf("FIFO空了！！！\n");
    ! X2 i0 R+ e2 O# z4 f/ }7 E0 }0 f
74.     }
    * O! S$ T; i6 F/ f! b- U0 Y
75.     else
    8 ?0 f9 w! b3 X+ W' n
76.     {
    
77.       printf("FIFO没空！！！\n");
    
78.     }
    & Y- d$ s# i0 \% `' f* C
79. 
    & O; B7 t7 T) \7 z
80.     printf("\n");
    1 y8 N& F  {! o: t* D# w' j! ^
81. 
    5 C8 t, ?& v* R
82.     for(;;)
    6 q" K* ~  D7 `' z& N. [% r* f
83.     {
    & V! t# p1 e) b0 \9 C  Z* e  s
84.       {
    
85.         if(RingBuffer_In(fifo, data, sizeof(data) / 2) > 0)
    ' H0 ]: ]. F& z( L  E7 ^- {( A) g
86.         {
    
87.           printf("FIFO写入成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
    * P! [0 p2 z9 A; S( j
88.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
    , R- O! M, J1 t2 E+ y. |
89.         }
    ! q' m. O( M9 }7 V7 ?) j( ?- D3 w
90.         else
    ! V0 A6 m( v! e4 s3 I$ G6 y
91.         {
      H. V$ m+ f3 U5 ], O& M- r
92.           printf("FIFO写入失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
    
93.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
    
94.         }
    4 G) h% l. u% u+ z" t
95. 
    " U: M; }, }! }( R9 u. _* L
96.         if(RingBuffer_IsFull(fifo) == true)
    , u9 ~4 q" @( ]
97.         {
    1 T2 y7 T6 _( y' F+ x. n* n8 `! ~
98.           printf("FIFO满了！！！\n");
    
99.         }
    9 V8 {$ @( l5 t" I) N
100.         else
     
101.         {
     
102.           printf("FIFO没满！！！\n");
     
103.         }
     
104. 
     0 i' t& e) k4 I; h
105.         if(RingBuffer_IsEmpty(fifo) == true)
     9 b5 K$ z, p, c  o+ t) a. J! P
106.         {
     
107.           printf("FIFO空了！！！\n");
     2 A' h& z9 U: k$ w+ W# @/ {
108.         }
     7 w: K$ J0 I, A& W8 }
109.         else
     + h1 J& v" w1 [0 B1 X" A
110.         {
     
111.           printf("FIFO没空！！！\n");
     % F# z7 p$ |7 @2 A
112.         }
     8 r; k3 A* A$ o1 o1 V
113.       }
     
114. 
     
115.       printf("\n");
     9 O  _; B+ M/ _: V/ I
116. 
     
117.       {
     : U* X5 o+ @/ B, j! u1 x
118.         uint8_t rdata[64] = {0};
     7 t% z, [+ c4 f2 T  t
119.         uint8_t len       = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     
120. 
     
121.         if(len > 0)
     ; {! I# g7 W1 H4 C9 J. y
122.         {
     * h. B. j2 `) d$ T
123.           printf("从FIFO中读出的数据，长度：%d\n", len);
     & C# @7 A" u1 h2 U# W0 _( X
124. 
     
125.           for(int i = 0; i < len; i++)
     * _+ @& A" t% X) B  l$ a7 F
126.           {
     
127.             printf("%d ", rdata[i]);
     + E7 T, v  L) r- b
128.           }
     
129. 
     
130.           printf("\n");
     
131. 
     
132.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
133.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
       t. D% U( v) g# A1 J9 V# t
134.         }
     , }4 I, k* [1 O9 T
135.         else
     2 _! O; Q; [5 v& B- h/ n6 s7 D
136.         {
     
137.           printf("FIFO读取失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
138.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
139.         }
     
140. 
     2 Y  a) D! z* s, [* t
141.         if(RingBuffer_IsFull(fifo) == true)
     0 G; T' W# S# d! ^# e$ d8 |- ^
142.         {
     
143.           printf("FIFO满了！！！\n");
     + _) m1 d) I$ [3 l/ d" c1 [) P
144.         }
     1 v( ?0 }7 m) a/ f8 C
145.         else
     
146.         {
     ; l0 c4 }- U$ y( J$ o2 U+ {
147.           printf("FIFO没满！！！\n");
     
148.         }
     0 H* f- N$ _4 P% S7 b  ^
149. 
     $ B! v" X4 \5 {  J7 v6 Y1 m7 }" ?: V
150.         if(RingBuffer_IsEmpty(fifo) == true)
     
151.         {
     
152.           printf("FIFO空了！！！\n");
     
153.         }
     * k& M% z) ~4 W. U4 X. w' M
154.         else
     ; @% t$ c8 w2 L& _, u5 M6 T7 Y7 x
155.         {
     
156.           printf("FIFO没空！！！\n");
     5 z# Q- t, l3 V! _
157.         }
     
158.       }
     
159. 
     
160.       printf("\n");
     $ v+ f, I* A+ u& X9 ]- f
161. 
     
162.       {
     
163.         RingBuffer_Reset(fifo);
     
164.         printf("FIFO清空成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
165.                RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
166. 
     
167.         if(RingBuffer_IsFull(fifo) == true)
     0 b1 k7 C0 }  @
168.         {
     
169.           printf("FIFO满了！！！\n");
     9 N1 N' O( K4 w% G( c
170.         }
     ; X) y( m9 h9 ?0 K
171.         else
     / j6 C% k5 d1 l. V
172.         {
     7 }; t1 D8 I' x0 i2 i% _
173.           printf("FIFO没满！！！\n");
     . N) |8 b1 y9 B+ g0 `
174.         }
     8 b8 l) u+ v6 }8 B# z
175. 
     4 P) B  t% F, Y* q
176.         if(RingBuffer_IsEmpty(fifo) == true)
     # i7 a5 d3 c# k; N: ?6 C6 u
177.         {
     3 S& L; M1 q9 h- `: |6 u
178.           printf("FIFO空了！！！\n");
     
179.         }
     . A2 l$ O3 A, r  V4 c4 L, T8 `9 L
180.         else
     ! Z7 U8 \* n2 n% r! g3 ?0 W
181.         {
     
182.           printf("FIFO没空！！！\n");
     
183.         }
     
184.       }
     % V: V' c: e6 w- A6 z) d- b7 ]
185. 
     
186.       printf("\n");
     6 j3 |: ?* g& \+ w
187. 
     
188.       {
     
189.         if(RingBuffer_In(fifo, data, sizeof(data)) > 0)
     ' o& S" i. f5 G" i$ {* ]
190.         {
     4 ?8 G$ ?7 [5 z3 }4 r  ]
191.           printf("FIFO写入成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
192.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     ( X. w+ d' S2 t  P! M. o* b
193.         }
     8 ^6 ]' w, G4 d: X) @
194.         else
     
195.         {
     
196.           printf("FIFO写入失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
197.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     2 Q' A7 k: d- s* D/ H+ ]/ V9 J
198.         }
     
199. 
     # {% a9 V* w" i5 m: ?8 D' B3 s$ g+ ^
200.         if(RingBuffer_IsFull(fifo) == true)
     
201.         {
     2 Z, z7 S- R" d6 J6 D8 J
202.           printf("FIFO满了！！！\n");
     
203.         }
     
204.         else
     5 |9 K) m2 H# [# v" q
205.         {
     
206.           printf("FIFO没满！！！\n");
     
207.         }
     2 ]' E8 Z% V- w& h5 [" ?
208. 
     ; G2 A# L1 j1 |5 K7 O) J' |
209.         if(RingBuffer_IsEmpty(fifo) == true)
     * u0 A6 b) O0 H6 I+ B
210.         {
     
211.           printf("FIFO空了！！！\n");
     # X& B& Q" G% O2 z+ ~
212.         }
     0 o- C; ]; X+ |' P. n# J1 G  p" Z4 B
213.         else
     ' k  ~. s2 _9 d7 t" Y
214.         {
     ( p$ ?4 M" e/ o. l
215.           printf("FIFO没空！！！\n");
     
216.         }
     + c, I6 l) ]+ J( J" q- i
217.       }
     " D9 D: m& \2 n0 \8 W# v, b
218. 
     0 o9 Z& C# I! u' F' l
219.       printf("\n");
     
220. 
     
221.       {
     
222.         if(RingBuffer_In(fifo, data, sizeof(data)) > 0)
     
223.         {
     
224.           printf("FIFO写入成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     % E2 [# l! E% T: k4 F9 s
225.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     * {" ~3 V; ^0 i, k0 Y, Q
226.         }
     ) n6 ]5 ]6 K3 Z+ u3 [( A
227.         else
     - w" {5 |& E9 g2 Z" W; E/ J+ I
228.         {
     
229.           printf("FIFO写入失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     * V: [: O; m; R3 q# C$ {
230.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
231.         }
     # k; j# B9 I, A' m- z
232. 
     
233.         if(RingBuffer_IsFull(fifo) == true)
     & a) N: Q  P/ x/ t
234.         {
     
235.           printf("FIFO满了！！！\n");
     " B; N7 I2 m  |+ U
236.         }
     " ~, m: p9 Q, U% d
237.         else
     
238.         {
     $ z! \. J! ^& |/ L$ j- O
239.           printf("FIFO没满！！！\n");
     
240.         }
     $ ?! O& f8 W2 w( N0 i& [, F
241. 
     0 q. F0 W( w- x- Z, n
242.         if(RingBuffer_IsEmpty(fifo) == true)
     
243.         {
     ( q: e: y* d% M- \! r0 `: \; E
244.           printf("FIFO空了！！！\n");
     8 W" R* Y" V+ f, y, p" H9 }
245.         }
     
246.         else
     
247.         {
     
248.           printf("FIFO没空！！！\n");
     9 i7 Q+ x, Y6 e: r! R% {
249.         }
     
250.       }
     
251. 
     
252.       printf("\n");
     9 ^+ L* G: a) }& X
253. 
     
254.       {
     
255.         uint8_t  rdata[256] = {0};
     
256.         uint16_t len        = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     . R) `( S$ k! e" j  [5 v
257. 
     
258.         if(len > 0)
     6 B7 [: @" J. W# F+ z, V. @$ ?
259.         {
     
260.           printf("从FIFO中读出的数据，长度：%d\n", len);
     
261. 
     
262.           for(int i = 0; i < len; i++)
     
263.           {
     ' u% ~, M% s* X9 k6 A
264.             printf("%d ", rdata[i]);
     " k4 S3 x* [; R2 j# }0 |. G& _
265.           }
     
266. 
     
267.           printf("\n");
     
268. 
     $ r: a6 q  g3 F0 T% x! q/ I
269.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     7 w+ z" D/ O% M9 d7 Z+ H
270.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     * {( X4 u: _& A  S6 h5 B# k
271.         }
     
272.         else
     5 V3 j3 O( q( v) ]! \
273.         {
     4 V0 v5 ~6 j  {1 l  g
274.           printf("FIFO读取失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
275.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     * U0 w% z# {1 y% ]7 z4 J6 n
276.         }
     
277. 
     
278.         if(RingBuffer_IsFull(fifo) == true)
     
279.         {
     2 D. L4 x9 v; a% z
280.           printf("FIFO满了！！！\n");
     2 G; p3 t0 g  b" P$ F3 Q4 J+ K, S
281.         }
     
282.         else
     
283.         {
     8 o) V( o4 b. h7 }% A( E
284.           printf("FIFO没满！！！\n");
       M+ T) O2 g1 z3 @0 R1 O& u
285.         }
     
286. 
     
287.         if(RingBuffer_IsEmpty(fifo) == true)
     
288.         {
     
289.           printf("FIFO空了！！！\n");
     % c2 Q) \7 o$ S
290.         }
       P7 l2 ^0 t) t6 k# O! ~- `
291.         else
     . ~9 F2 t  X1 j4 k4 r5 ?) `
292.         {
     9 K0 Z5 T# g- ]6 G
293.           printf("FIFO没空！！！\n");
     
294.         }
     
295.       }
     
296. 
     * D4 g. Q7 y# e4 K
297.       printf("\n");
     ! m( f, {+ `% i% _" c
298. 
     
299.       {
     1 j4 z8 k" K: C$ A/ N+ Z
300.         uint8_t  rdata[256] = {0};
     
301.         uint16_t len        = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     5 j# G, L6 Z; R
302. 
     
303.         if(len > 0)
     
304.         {
     
305.           printf("从FIFO中读出的数据，长度：%d\n", len);
     
306. 
     * J7 @: T7 _/ M& }; v* S+ [. A9 `
307.           for(int i = 0; i < len; i++)
     5 O' }4 Y7 v" j; @
308.           {
     
309.             printf("%d ", rdata[i]);
     6 Q  l( {5 S8 E$ k  o
310.           }
     " R: _6 S, u: h* K  ^
311. 
     . P7 b. R8 q  c( \! z
312.           printf("\n");
     
313. 
     
314.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     ' [# F3 o" J3 Q9 Q# b7 @: y
315.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
316.         }
     / `1 O! i8 C  C; v  O$ J
317.         else
     / @% ]6 m7 k# A3 K7 L" Q. f
318.         {
     
319.           printf("FIFO读取失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
320.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
321.         }
     ( g+ ^# X* J2 w: y; s6 @
322. 
     # s9 U$ T; z; d6 W3 [8 w
323.         if(RingBuffer_IsFull(fifo) == true)
     ! ^/ k- ]+ Y; p/ {. P
324.         {
     
325.           printf("FIFO满了！！！\n");
     ( A8 m0 V$ n! ^5 P, Z4 [0 ]
326.         }
     
327.         else
     ! |7 s+ K- B7 ]/ f$ B! T9 c3 l, f5 C
328.         {
     , Y1 p2 Q+ C. P/ D3 P
329.           printf("FIFO没满！！！\n");
     
330.         }
     
331. 
     9 {! a- o* ~2 _% w" I# |+ S
332.         if(RingBuffer_IsEmpty(fifo) == true)
     1 W$ G, |9 N; @6 T! B
333.         {
     
334.           printf("FIFO空了！！！\n");
     
335.         }
     
336.         else
     8 ?2 }* C8 C! O) t7 _
337.         {
     # G. I" L% r7 X5 p. G
338.           printf("FIFO没空！！！\n");
     ' F) N6 ?( J2 u$ [3 N9 D# K
339.         }
     
340.       }
     
341. 
     # g3 Y7 b) J( y3 v1 O. ?
342.       printf("\n\n\n");
     
343.       Sleep(5000);
     
344.     }
     2 V' [- V7 O% f& P  y  w/ U
345.   }
     : G3 V  D: M& X6 k
346.   else
     / a) Z4 N9 z$ d1 r9 \1 x8 k
347.   {
       e8 n( P8 O/ s
348.     printf("FIFO创建失败\n");
     + {$ `. ]* s2 V: w4 h! {
349.   }
     / f* {5 L4 n/ u  j4 B/ b) h
350. 
     
351.   for(;;)
     + R! z& k$ [/ R/ s0 t+ [
352.   {
     
353. 
     4 C# R) u& Y. X5 H$ Q: u" Q0 [
354.   }
     1 c9 `5 Z+ A9 F, f3 ~
355. }
     0 @: A2 v5 n2 k/ h$ x

复制代码

3，运行效果
, k. h7 {/ n8 y0 S$ x, \

. P( c2 O, a* f* I% N/ ^' ~! r

bargagebaobei 发表于 2018-3-7 16:38
亲 可以给个链接吗

' T3 I( s3 l: _: m0 q8 qGitHub仓库：http://github.com/XinLiGitHub/RingBuffer

MrJiu 发表于 2018-3-7 13:39
C语言数据结构里面有，很快就可以实现！！！

: {/ ?, Q6 ~+ c/ q+ Tkfifo 可以实现，一个线程写，一个线程读，不需要任何的保护。无锁编程才是他的精髓。

可以直接移植到嵌入式端，非常方便。

谢谢分享，学习了

% i: ~& {) g. J( h! E, L9 g: `2 ^
谢谢分享
! ~* {. c' I* i/ C& ^% Y# g以前搞过ram模拟fifo，还没用过环形fifo，学习学习。

感谢楼主分享

这个程序例程很受用，也谢谢楼主的分享了。

! Y) R; `' [6 A& X% {- {! W谢谢分享，学习了

这是从Linux内核里面弄出来的。

C语言数据结构里面有，很快就可以实现！！！

MrJiu 发表于 2018-3-7 13:39
5 v  R! b8 h. j  L' K6 `C语言数据结构里面有，很快就可以实现！！！

; s4 b) h$ n, C) {6 I- Z, h巧夺天工的kfifo(修订版)

十分感谢楼主的分享啊 省的我自己费脑筋啊

怎么才能收藏帖子呢

bargagebaobei 发表于 2018-3-7 15:21
怎么才能收藏帖子呢

可以去GitHub，有完整的工程。

XinLiYF 发表于 2018-3-7 16:13
4 ^5 m. \) I7 [可以去GitHub，有完整的工程。

+ g0 f  [0 z% J3 D/ u# Z( V7 e5 `亲 可以给个链接吗