模仿kfifo实现的环形缓冲区

转载来源：模仿kfifo实现的环形缓冲区
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  ~8 k4 U+ H2 w# D3 [3 dGitHub仓库：http://github.com/XinLiGitHub/RingBuffer
2 W+ Y& c  v/ j1 M8 `# N/ nPS：博文不再更新，后续更新会在GitHub仓库进行。

- i, `( y! g- m+ N/ p' \    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)。

1，开发环境
  r/ a5 `: Y: z" y, ]      1，操作系统：Windows 10 专业版
! S, @( M4 [0 j0 h; V- u      2，IDE：Visual Studio 2015 专业版
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1 x# A* }. K% m+ @& L2，程序源码
      RingBuffer.h文件

1. /**
   
2.   ******************************************************************************
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3.   * @file    RingBuffer.h
   ' V; e* ^8 _7 E2 r+ f) ^/ m! S
4.   * @author  XinLi
   
5.   * @version v1.0
   
6.   * @date    15-January-2018
   
7.   * @brief   Header file for RingBuffer.c module.
   . Z  L- U( j9 Q9 ?" w6 N9 S
8.   ******************************************************************************
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9.   * @attention
   
10.   *
    ( ]3 i6 Q! T- O) s" b- g
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
    
12.   *
    
13.   * This program is free software: you can redistribute it and/or modify
    9 Q+ `: J; ?. ^' ?: K
14.   * it under the terms of the GNU General Public License as published by
    ' b" r! {; K6 r) a9 x% |3 p8 n4 ?$ }
15.   * the Free Software Foundation, either version 3 of the License, or
    
16.   * (at your option) any later version.
    
17.   *
    . u3 l* X6 q8 @9 R- m
18.   * This program is distributed in the hope that it will be useful,
    3 f9 m4 o1 `" o" T. t5 X- w' e/ ]
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.
    2 z# E/ z( Z( U
22.   *
    / G* k$ M2 |8 Y
23.   * You should have received a copy of the GNU General Public License
    : H. o( k( D2 V: C, I9 ]
24.   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    . F2 W, ?1 q) |: n
25.   *
    ( d  q4 I& q" l5 l
26.   ******************************************************************************
    ) h. ~! _7 G$ q$ \7 [5 `8 s
27.   */
    5 _2 H0 q& O; @7 w( q
28. 
    % ?5 S- j' b& e( R) w
29. #ifndef __RINGBUFFER_H
    
30. #define __RINGBUFFER_H
    
31. 
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32. #ifdef __cplusplus
    
33. extern "C" {
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34. #endif
    
35. 
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36. /* Header includes -----------------------------------------------------------*/
    , U8 I- Y3 \; ?/ M3 i  }
37. #include <stdint.h>
    
38. #include <stdbool.h>
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39. 
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40. /* Macro definitions ---------------------------------------------------------*/
    
41. #define RING_BUFFER_MALLOC(size)  malloc(size)
    
42. #define RING_BUFFER_FREE(block)   free(block)
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43. 
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44. /* Type definitions ----------------------------------------------------------*/
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45. typedef struct
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46. {
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47.   uint8_t *buffer;
    
48.   uint32_t size;
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49.   uint32_t in;
    
50.   uint32_t out;
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51. }RingBuffer;
    
52. 
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53. /* Variable declarations -----------------------------------------------------*/
    
54. /* Variable definitions ------------------------------------------------------*/
    
55. /* Function declarations -----------------------------------------------------*/
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56. RingBuffer *RingBuffer_Malloc(uint32_t size);
    
57. void RingBuffer_Free(RingBuffer *fifo);
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58. uint32_t RingBuffer_In(RingBuffer *fifo, void *in, uint32_t len);
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59. uint32_t RingBuffer_Out(RingBuffer *fifo, void *out, uint32_t len);
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60. 
    
61. /* Function definitions ------------------------------------------------------*/
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62. 
    
63. /**
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64.   * @brief  Removes the entire FIFO contents.
    
65.   * @param  [in] fifo: The fifo to be emptied.
    
66.   * @return None.
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67.   */
    
68. static inline void RingBuffer_Reset(RingBuffer *fifo)
    
69. {
    
70.   fifo->in = fifo->out = 0;
    
71. }
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72. 
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73. /**
    
74.   * @brief  Returns the size of the FIFO in bytes.
    
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.   */
    
78. static inline uint32_t RingBuffer_Size(RingBuffer *fifo)
    
79. {
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80.   return fifo->size;
    
81. }
    
82. 
    
83. /**
    
84.   * @brief  Returns the number of used bytes in the FIFO.
    
85.   * @param  [in] fifo: The fifo to be used.
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86.   * @return The number of used bytes.
    
87.   */
    
88. static inline uint32_t RingBuffer_Len(RingBuffer *fifo)
    
89. {
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90.   return fifo->in - fifo->out;
    
91. }
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92. 
    
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)
    
99. {
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100.   return RingBuffer_Size(fifo) - RingBuffer_Len(fifo);
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101. }
     
102. 
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103. /**
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104.   * @brief  Is the FIFO empty?
     
105.   * @param  [in] fifo: The fifo to be used.
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106.   * @retval true:      Yes.
     
107.   * @retval false:     No.
     
108.   */
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109. static inline bool RingBuffer_IsEmpty(RingBuffer *fifo)
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110. {
     
111.   return RingBuffer_Len(fifo) == 0;
     
112. }
     
113. 
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114. /**
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115.   * @brief  Is the FIFO full?
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116.   * @param  [in] fifo: The fifo to be used.
     
117.   * @retval true:      Yes.
     
118.   * @retval false:     No.
     
119.   */
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120. static inline bool RingBuffer_IsFull(RingBuffer *fifo)
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121. {
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122.   return RingBuffer_Avail(fifo) == 0;
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123. }
     
124. 
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125. #ifdef __cplusplus
     
126. }
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127. #endif
     
128. 
     
129. #endif /* __RINGBUFFER_H */
     

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      RingBuffer.c文件

1. /**
   
2.   ******************************************************************************
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3.   * @file    RingBuffer.c
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4.   * @author  XinLi
   " |" R9 T; U/ _# C
5.   * @version v1.0
   
6.   * @date    15-January-2018
   
7.   * @brief   Ring buffer module source file.
   
8.   ******************************************************************************
   
9.   * @attention
   
10.   *
    2 T  b8 B% \& K4 y6 N! {7 o
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
    : `. {# O  O" Y( e  d3 G" G9 L
12.   *
    & ~9 ]8 P: I1 l! ~* h3 v, I
13.   * This program is free software: you can redistribute it and/or modify
    6 {5 [$ N0 m/ k& {( p
14.   * it under the terms of the GNU General Public License as published by
    ; g- `6 d/ Y: [3 q$ E( Y
15.   * the Free Software Foundation, either version 3 of the License, or
    
16.   * (at your option) any later version.
    
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
    : a1 I$ G9 S# l( S' e
21.   * GNU General Public License for more details.
    : J5 \" A# R& \/ a/ P
22.   *
    
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. 
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34. /* Macro definitions ---------------------------------------------------------*/
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35. /* Type definitions ----------------------------------------------------------*/
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36. /* Variable declarations -----------------------------------------------------*/
    
37. /* Variable definitions ------------------------------------------------------*/
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38. /* Function declarations -----------------------------------------------------*/
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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 ------------------------------------------------------*/
    
43. 
    
44. /**
    
45.   * @brief  Allocates a new FIFO and its internal buffer.
    
46.   * @param  [in] size: The size of the internal buffer to be allocated.
    
47.   * @note   The size will be rounded-up to a power of 2.
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48.   * @return RingBuffer pointer.
    
49.   */
    
50. RingBuffer *RingBuffer_Malloc(uint32_t size)
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51. {
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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)
    
57.     {
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58.       if(size > 0x80000000UL)
    
59.       {
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60.         RING_BUFFER_FREE(fifo);
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61.         fifo = NULL;
    
62.         return fifo;
    
63.       }
    
64. 
    
65.       size = roundup_pow_of_two(size);
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66.     }
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67. 
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68.     fifo->size   = size;
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69.     fifo->in     = 0;
    4 V( g; ^# Y( j5 B/ Z
70.     fifo->out    = 0;
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71.     fifo->buffer = RING_BUFFER_MALLOC(fifo->size);
    
72. 
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73.     if(fifo->buffer == NULL)
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74.     {
    
75.       RING_BUFFER_FREE(fifo);
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76.       fifo = NULL;
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77.       return fifo;
    + |/ m/ N+ ~9 {
78.     }
    
79.   }
    / ?: \% t; ], D9 I1 F! ]
80. 
    + |: e8 s* i- |
81.   return fifo;
    
82. }
    $ H; K4 Q' i6 m9 S
83. 
    % B3 n# L: S3 R) v2 e
84. /**
    # l2 Q0 ?. H9 c
85.   * @brief  Frees the FIFO.
    
86.   * @param  [in] fifo: The fifo to be freed.
    
87.   * @return None.
    ( b* v8 H; {0 Y
88.   */
    
89. void RingBuffer_Free(RingBuffer *fifo)
    
90. {
    
91.   RING_BUFFER_FREE(fifo->buffer);
    
92.   RING_BUFFER_FREE(fifo);
    
93.   fifo = NULL;
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94. }
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95. 
    
96. /**
    
97.   * @brief  Puts some data into the FIFO.
    
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.
     
102.   * @note   This function copies at most @len bytes from the @in into
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103.   *         the FIFO depending on the free space, and returns the number
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104.   *         of bytes copied.
     
105.   */
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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. */
     
111.   uint32_t l = min(len, fifo->size - (fifo->in & (fifo->size - 1)));
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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. */
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115.   memcpy(fifo->buffer, (uint8_t *)in + l, len - l);
     , `4 d. i: J3 X- N1 W; D7 c
116. 
     1 u# U/ u! |% E& c) o- A$ i
117.   fifo->in += len;
     5 Z& `- K- i' v9 ~
118. 
     2 N8 Y* q& E8 Z2 X% t
119.   return len;
     1 \# {5 R: O% O& N5 q/ ]
120. }
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121. 
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122. /**
     3 u- T% @. X( c! I* F
123.   * @brief  Gets some data from the FIFO.
     + {! f8 V/ x. X6 f9 s; o
124.   * @param  [in] fifo: The fifo to be used.
     ! n8 Q' A' S8 a3 O2 `, q
125.   * @param  [in] out:  Where the data must be copied.
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126.   * @param  [in] len:  The size of the destination buffer.
     5 A& _$ h* s7 B$ ~7 V3 |
127.   * @return The number of copied bytes.
     
128.   * @note   This function copies at most @len bytes from the FIFO into
     
129.   *         the @out and returns the number of copied bytes.
     
130.   */
     7 p% q# n/ v/ V+ T
131. uint32_t RingBuffer_Out(RingBuffer *fifo, void *out, uint32_t len)
     
132. {
     
133.   len = min(len, RingBuffer_Len(fifo));
     & A' n) [( ~7 w0 T" S/ z% i. l
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)));
     
137.   memcpy(out, fifo->buffer + (fifo->out & (fifo->size - 1)), l);
     ) R1 J; O: `. _5 H) `
138. 
     
139.   /* Then get the rest (if any) from the beginning of the buffer. */
     
140.   memcpy((uint8_t *)out + l, fifo->buffer, len - l);
     " G- B& F  H7 m! O: Q; l% _. O
141. 
     / L" c) K- S  f; R3 G# j
142.   fifo->out += len;
     2 X0 \+ T* a7 R4 {( J1 J% F3 }! {
143. 
     / Z+ Q0 R" ?, D  I
144.   return len;
     / V2 H- G2 g5 K6 C, ~8 v1 w4 _1 _
145. }
     
146. 
     
147. /**
     
148.   * @brief  Determine whether some value is a power of two.
     + V, `8 X3 r$ X; {! S
149.   * @param  [in] x: The number to be confirmed.
     * {# t( C  v+ C. _6 l! v
150.   * @retval true:   Yes.
     
151.   * @retval false:  No.
     
152.   * @note   Where zero is not considered a power of two.
     
153.   */
     ; A+ G! b1 X+ I7 i
154. static bool is_power_of_2(uint32_t x)
     + d7 |. c$ t9 h5 Q2 w
155. {
     0 i2 j  g' K6 Z# R4 |8 B  b
156.   return (x != 0) && ((x & (x - 1)) == 0);
     
157. }
     
158. 
     % I" r# L# D! l$ D1 V( @* O
159. /**
     
160.   * @brief  Round the given value up to nearest power of two.
     
161.   * @param  [in] x: The number to be converted.
       M, L5 V. Z/ D5 D& t4 P" g( @
162.   * @return The power of two.
     ; f- Q8 h: t& X  @/ a" A0 s
163.   */
     : q& w1 ^5 G. Q& R( Q7 W( G( Q
164. static uint32_t roundup_pow_of_two(uint32_t x)
     
165. {
     : i" s# Q/ \) ^7 ?
166.   uint32_t b = 0;
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167. 
     
168.   for(int i = 0; i < 32; i++)
     5 C* L% J) Y) ]0 Y/ n4 O  J
169.   {
     
170.     b = 1UL << i;
     % l8 [6 f2 }# k+ {
171. 
     
172.     if(x <= b)
     : B6 C) |: h! t) G4 i5 w, W1 t/ M
173.     {
     ( V! |) g2 H1 c' K; e
174.       break;
     0 e! V5 h* l# T# D9 Q4 G
175.     }
     ( J4 s3 J9 u3 N3 s2 u# h5 q( c
176.   }
     % ?; i; V4 e0 F) \$ f# o0 _3 ^
177. 
     
178.   return b;
     
179. }
     

复制代码

. Z, O2 c7 ?. d9 [      main.c文件

1. /**
   , p8 [4 ?+ x) L( z, U3 c; m$ k
2.   ******************************************************************************
   
3.   * @file    main.c
   
4.   * @author  XinLi
   
5.   * @version v1.0
   
6.   * @date    15-January-2018
   
7.   * @brief   Main program body.
   
8.   ******************************************************************************
   
9.   * @attention
   
10.   *
    . J" H4 J% f1 b, ?' X
11.   * <h2><center>Copyright © 2018 XinLi</center></h2>
    
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
    
15.   * the Free Software Foundation, either version 3 of the License, or
    3 [$ c/ _% V5 f9 V6 V
16.   * (at your option) any later version.
    - q/ |/ }9 Z$ C7 j
17.   *
    
18.   * This program is distributed in the hope that it will be useful,
    , _, q- s# |# a$ X" P0 S" T
19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    8 J( p* m  M5 {5 x* i/ x
20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    0 P2 ^3 I; A+ `( \- J
21.   * GNU General Public License for more details.
    
22.   *
    7 i/ Z; N1 {4 I/ O* `0 H
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.   */
    9 |. Q& V: w% r/ s
28. 
    
29. /* Header includes -----------------------------------------------------------*/
    
30. #include "RingBuffer.h"
    ; m" K% ]( r: d5 ~% V' ~
31. #include <stdio.h>
    
32. #include <windows.h>
    
33. 
    & U6 B6 G7 U& I  d
34. /* Macro definitions ---------------------------------------------------------*/
    : m5 E. _, ^$ g* H. c
35. /* Type definitions ----------------------------------------------------------*/
    9 s/ [* C: O! x
36. /* Variable declarations -----------------------------------------------------*/
    
37. /* Variable definitions ------------------------------------------------------*/
    
38. /* Function declarations -----------------------------------------------------*/
    
39. /* Function definitions ------------------------------------------------------*/
    1 C& z3 P- L$ H9 P, C* C: u* p
40. 
    * ?! a) i: f2 c! o
41. /**
    
42.   * @brief  Main program.
    
43.   * @param  None.
    
44.   * @return None.
    
45.   */
    
46. int main(void)
    & \' q9 @3 a+ @8 ?$ a7 |; K
47. {
    2 \9 K  R& Z8 P* b4 O9 {1 d1 v
48.   uint8_t data[256] = {0};
    & o: d: ]- c. X& K. y: H- [' P( U6 K
49. 
    ; o  y6 L2 i$ K! m2 Z
50.   for(int i = 0; i < sizeof(data); i++)
    
51.   {
    
52.     data[i] = i;
    
53.   }
    7 W3 J. C+ H4 B  ?5 z1 X5 T
54. 
    2 q# n: V6 S0 e+ n1 `, U# h9 E' ^
55.   RingBuffer *fifo = RingBuffer_Malloc(sizeof(data));
    " `1 [; G# K4 p
56. 
    
57.   if(fifo != NULL)
    
58.   {
    
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));
    1 U/ N0 W6 H, k  `
61. 
    * U; M+ ~- x. o  D: d! ~
62.     if(RingBuffer_IsFull(fifo) == true)
    
63.     {
    
64.       printf("FIFO满了！！！\n");
    6 v6 D/ N7 r1 Q" o" Q
65.     }
    
66.     else
    + C2 A5 c1 Z1 s+ }2 W
67.     {
    , ]8 Z7 T2 f: e  G5 E
68.       printf("FIFO没满！！！\n");
    
69.     }
    " z4 P( C4 y6 C" t4 T. i$ T7 Z. {
70. 
    
71.     if(RingBuffer_IsEmpty(fifo) == true)
    
72.     {
    
73.       printf("FIFO空了！！！\n");
    
74.     }
    
75.     else
    
76.     {
    
77.       printf("FIFO没空！！！\n");
    8 T' _+ b* V+ g- Q" n4 F+ ~
78.     }
    ' E& w3 C  S8 [8 {& H
79. 
    
80.     printf("\n");
    
81. 
    
82.     for(;;)
    # v* [+ j$ j  g, T
83.     {
    
84.       {
    
85.         if(RingBuffer_In(fifo, data, sizeof(data) / 2) > 0)
    : ?0 c4 d5 ]6 I# U4 @  ]
86.         {
    
87.           printf("FIFO写入成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
    
88.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
    - B; x, z6 [, {3 F4 k' G
89.         }
    ' G$ h$ @! k: Q5 |
90.         else
    
91.         {
    3 t$ q. T7 K+ F# H' n
92.           printf("FIFO写入失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
    . n- ?2 c& s  ]- }( w$ [: b
93.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
    
94.         }
    - h& W& Q2 E+ F/ e& I
95. 
    * A- {9 U9 [0 C
96.         if(RingBuffer_IsFull(fifo) == true)
    
97.         {
    0 l/ T4 X; A, |' d  i. A) W( z  h, X
98.           printf("FIFO满了！！！\n");
    $ a* i/ H, [1 T5 ?) t
99.         }
    
100.         else
     
101.         {
       m# W% G" n) l. G  H
102.           printf("FIFO没满！！！\n");
     ! S2 n0 X6 U! J7 m
103.         }
     & U' [6 S; F# ?; P$ R( ^6 k' L  D
104. 
     0 }- T2 p" x& M$ w9 \
105.         if(RingBuffer_IsEmpty(fifo) == true)
     1 ^6 [% r9 ~+ C& ?) U8 r8 K+ M
106.         {
     
107.           printf("FIFO空了！！！\n");
     : l* {9 R( ~: O: H3 W, A9 ?' s% ^
108.         }
     ' Y/ n0 t# t+ a# P7 _9 d
109.         else
     
110.         {
     3 W" i, D: k& V4 H0 p
111.           printf("FIFO没空！！！\n");
     
112.         }
     & C, {# G  S* @
113.       }
     & \' ^0 D* z4 l* h, q: i
114. 
     
115.       printf("\n");
     
116. 
     1 I2 L2 Z  t; o- ?5 ~! }. o
117.       {
     
118.         uint8_t rdata[64] = {0};
     
119.         uint8_t len       = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     
120. 
     ' L3 q1 C- M' e* O" @9 ^# j" H
121.         if(len > 0)
     
122.         {
     
123.           printf("从FIFO中读出的数据，长度：%d\n", len);
     6 q/ r/ A) t* ^7 X4 b
124. 
     
125.           for(int i = 0; i < len; i++)
     
126.           {
     
127.             printf("%d ", rdata[i]);
     
128.           }
     . s# Z" k' c4 {6 {: k  s" v7 U& L
129. 
     * C0 l# `, C5 b; e  ?
130.           printf("\n");
     * o. }7 @; Q8 g* e1 p9 ^
131. 
     
132.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     - Y. v! H8 p: c6 v) F7 S" c2 G
133.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
134.         }
     3 K9 \0 K8 M- T+ M5 }9 d" ]3 A
135.         else
     0 z+ s; P9 a& F
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));
     " f- n: W& ~5 G8 P: B1 x6 ^
139.         }
     
140. 
     2 G' [3 X7 w7 G% v
141.         if(RingBuffer_IsFull(fifo) == true)
     
142.         {
     8 v# @- E1 q: M2 p
143.           printf("FIFO满了！！！\n");
     
144.         }
     
145.         else
     3 Z( F, d, ]4 r
146.         {
     
147.           printf("FIFO没满！！！\n");
     
148.         }
     # G7 Y8 E/ ^4 i( ^2 ?  p
149. 
     
150.         if(RingBuffer_IsEmpty(fifo) == true)
     
151.         {
     : \5 d' {+ ^( l1 N- |
152.           printf("FIFO空了！！！\n");
     ! ^5 c. ?% c  m. H. v2 p$ s6 a4 b
153.         }
     
154.         else
     , a( X" t- j* o1 V2 f
155.         {
     1 X& z( G8 T* _
156.           printf("FIFO没空！！！\n");
     ; l) e) B$ A# h
157.         }
     
158.       }
     : [/ i( m  o% X9 Z
159. 
     
160.       printf("\n");
     8 U( i) G; M; a! h" @, k' D
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));
     9 D( @$ Q( X. |- C
166. 
     ) _+ F- A- t, F3 ?
167.         if(RingBuffer_IsFull(fifo) == true)
     7 B) T4 o3 H  Y5 D# s+ S
168.         {
     3 o4 C: p. I" c# k" I, f$ G5 _
169.           printf("FIFO满了！！！\n");
     
170.         }
     
171.         else
     4 s9 f  K4 n* `+ O1 ~. J9 ?
172.         {
     
173.           printf("FIFO没满！！！\n");
     
174.         }
     
175. 
     
176.         if(RingBuffer_IsEmpty(fifo) == true)
     
177.         {
     
178.           printf("FIFO空了！！！\n");
     
179.         }
     % P4 ^8 K3 \1 d( e" n
180.         else
     
181.         {
     3 w# M9 }! ]8 Q
182.           printf("FIFO没空！！！\n");
     . g& K" [  p+ }. r, k  @, ^
183.         }
     ; y7 j7 ^8 L, B
184.       }
     
185. 
     
186.       printf("\n");
     ' }& z7 R  a7 p
187. 
     
188.       {
     
189.         if(RingBuffer_In(fifo, data, sizeof(data)) > 0)
     # C- P$ A% y, n6 R5 N$ E
190.         {
     
191.           printf("FIFO写入成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     9 L6 M% i/ `+ o
192.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     . w, J' G: j, A; C; _
193.         }
     
194.         else
     + `& s( v( f+ o  U& b' _! w( A
195.         {
     ) Q7 h. P$ F. ~  d  x
196.           printf("FIFO写入失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
       X' _& |8 A$ X# C! D5 O
197.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
198.         }
     " W* g6 ?: R0 F7 ^: |- S
199. 
     0 |8 ^; X; l  N5 L- h
200.         if(RingBuffer_IsFull(fifo) == true)
     - s: v' j/ G( x/ k
201.         {
     
202.           printf("FIFO满了！！！\n");
     7 L% Y( T- ]9 q/ ]* J
203.         }
       d: ~4 }+ Y) Z; A  C
204.         else
     , E/ U' g8 `9 i( b
205.         {
     
206.           printf("FIFO没满！！！\n");
     4 P9 ^, Y  F4 [  }9 Q7 V4 U
207.         }
     
208. 
     , K" c3 J# D, B. c' O
209.         if(RingBuffer_IsEmpty(fifo) == true)
     
210.         {
     
211.           printf("FIFO空了！！！\n");
     3 m+ l: X' a. G0 H8 [# I+ |
212.         }
     
213.         else
     0 z' v3 `. _1 F* t  _
214.         {
     
215.           printf("FIFO没空！！！\n");
     9 ^* v' M: ?; K2 |3 x9 I
216.         }
     
217.       }
     5 }- e; X6 |1 K
218. 
     4 ~! @0 Y: m  h4 d# n
219.       printf("\n");
     / Q! x! N) ^; z. G6 T+ ~
220. 
     
221.       {
     ( Z: U# c- z/ O2 R0 J
222.         if(RingBuffer_In(fifo, data, sizeof(data)) > 0)
     
223.         {
     7 Q& M: ~6 D% t% D
224.           printf("FIFO写入成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     , o7 W4 W3 P2 l( w% A! v. c
225.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
226.         }
     
227.         else
     & S( b8 ?, w! K4 ~# d0 K8 C1 b
228.         {
     
229.           printf("FIFO写入失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     8 H! V9 x( ]! v: w. x
230.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
231.         }
     
232. 
     
233.         if(RingBuffer_IsFull(fifo) == true)
     
234.         {
     
235.           printf("FIFO满了！！！\n");
     ! x  v0 ?! j& C
236.         }
     ) Z0 r5 g! n4 L/ G
237.         else
     
238.         {
     
239.           printf("FIFO没满！！！\n");
     # h: j8 [+ O' u  H
240.         }
     
241. 
     
242.         if(RingBuffer_IsEmpty(fifo) == true)
     0 h1 c: O: b# ?' ~- f. Q1 h: G
243.         {
     
244.           printf("FIFO空了！！！\n");
     
245.         }
     2 S. i& `. O2 Q4 x8 L% p7 i
246.         else
     
247.         {
     
248.           printf("FIFO没空！！！\n");
     
249.         }
     
250.       }
     
251. 
     
252.       printf("\n");
     7 k8 @) _) C1 e& C8 d/ g3 V  ]9 B
253. 
     
254.       {
     , c: d5 G) Y  Z" |8 [% e# S$ D/ t
255.         uint8_t  rdata[256] = {0};
     % r% b' c1 c4 ^0 C% o/ U
256.         uint16_t len        = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     
257. 
     0 ?6 x; U- o: G/ m& i- }
258.         if(len > 0)
     
259.         {
     , a; |; k' ~% O* {; o! S: Z' e
260.           printf("从FIFO中读出的数据，长度：%d\n", len);
     
261. 
     9 b* t5 j: u1 `$ k6 {! d* |
262.           for(int i = 0; i < len; i++)
     7 h6 l8 C" t/ d$ |. ~5 G5 K" q
263.           {
     
264.             printf("%d ", rdata[i]);
     
265.           }
     
266. 
     % x9 w, E. K3 T
267.           printf("\n");
     
268. 
     ! _0 i& n% d9 k# S6 K* S
269.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
270.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     % h& Q5 M! u0 i. L% b
271.         }
     ' }1 K. a1 X. `6 i- p; s  P! E2 h
272.         else
     ( _; }$ L. l0 |3 q( J' K6 g
273.         {
     
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));
     : k# A! Z! @  t+ ~; G
276.         }
     
277. 
       b2 H' G! b3 o$ l" s
278.         if(RingBuffer_IsFull(fifo) == true)
     
279.         {
       d6 C7 V1 y& {: ?
280.           printf("FIFO满了！！！\n");
     
281.         }
     
282.         else
     7 `' e1 }3 @$ E
283.         {
     ' s3 s0 y0 u9 x
284.           printf("FIFO没满！！！\n");
     
285.         }
     
286. 
     
287.         if(RingBuffer_IsEmpty(fifo) == true)
     7 c& p: a- v# Y4 G; b
288.         {
     ' R. b# R" G# [. z4 M! e" R& |
289.           printf("FIFO空了！！！\n");
     3 m; p* u/ ~: y4 I7 u
290.         }
     
291.         else
     ( J! B6 J5 I8 C/ P
292.         {
     
293.           printf("FIFO没空！！！\n");
     1 T- T3 z1 O" K
294.         }
     
295.       }
     
296. 
     ! G4 d3 i8 g) v% m0 v9 ?
297.       printf("\n");
     $ O7 c; a( ]3 s
298. 
     
299.       {
     . i7 e1 k# |7 B0 t# |# w: w
300.         uint8_t  rdata[256] = {0};
     
301.         uint16_t len        = RingBuffer_Out(fifo, rdata, sizeof(rdata));
     
302. 
     7 E! e- L( ]! [/ [, `
303.         if(len > 0)
     
304.         {
     7 d9 d! T2 Q4 |
305.           printf("从FIFO中读出的数据，长度：%d\n", len);
     1 q7 T& g6 @6 D5 M- S3 O0 H7 k' |7 L
306. 
     
307.           for(int i = 0; i < len; i++)
     $ C, Y- A: u+ ^; j" v
308.           {
     2 |. s0 q$ J2 K
309.             printf("%d ", rdata[i]);
     
310.           }
     
311. 
     8 p; a" ^2 G  X; P' P* o
312.           printf("\n");
     
313. 
     % N0 A: g' x3 L# ?
314.           printf("FIFO读取成功，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     
315.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     
316.         }
     & Y9 Q5 t  d" ^& n% `, h1 p. _
317.         else
     
318.         {
     - v! P$ A9 m# D+ h* H1 q( R5 @( @
319.           printf("FIFO读取失败，FIFO大小：%d，使用大小：%d，剩余大小：%d\n",
     7 E: D1 C* d0 C' i! `# j2 n
320.                  RingBuffer_Size(fifo), RingBuffer_Len(fifo), RingBuffer_Avail(fifo));
     ! ~  u9 p, u% _  [
321.         }
     
322. 
     , k9 n' L0 v8 r' E7 A/ y6 m& Z+ X0 u
323.         if(RingBuffer_IsFull(fifo) == true)
     7 X/ c% W' Z& j2 P" ^4 L
324.         {
     
325.           printf("FIFO满了！！！\n");
     $ g' r8 u  G  E% O8 d! n9 [, S
326.         }
     
327.         else
     
328.         {
     
329.           printf("FIFO没满！！！\n");
     # a- x. i  l1 u  R
330.         }
     * n5 B( N  U" m# Q
331. 
     
332.         if(RingBuffer_IsEmpty(fifo) == true)
     
333.         {
     
334.           printf("FIFO空了！！！\n");
     
335.         }
     
336.         else
     
337.         {
     
338.           printf("FIFO没空！！！\n");
     
339.         }
     
340.       }
     
341. 
     
342.       printf("\n\n\n");
     ! @' ^+ n' H/ l8 A' U
343.       Sleep(5000);
     4 V+ M; n1 V: F2 h
344.     }
     
345.   }
     
346.   else
     * l" [9 N$ _2 E
347.   {
     $ w/ k  Q* Z% [9 w
348.     printf("FIFO创建失败\n");
     # n) e4 W* `. b5 v2 h" t
349.   }
     
350. 
     8 o! O0 I7 R/ T
351.   for(;;)
     - X$ B! m8 F; i2 g8 o0 D! v4 H3 ]
352.   {
     
353. 
     , g  q" u6 @- I" Y' r  E1 [
354.   }
     
355. }
     2 ?) m' O0 s- Y# {2 f5 L" D

复制代码

* y: ^- {$ R8 I; F- x  w3，运行效果

# Y1 {& o7 U, m2 j$ t7 G0 U! ~! E' {
* c/ E4 n- g6 g" H5 M( g

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

GitHub仓库：http://github.com/XinLiGitHub/RingBuffer

MrJiu 发表于 2018-3-7 13:39
) W3 r  V2 [9 v+ A! H: nC语言数据结构里面有，很快就可以实现！！！

2 M: d# J5 J! B6 Z& I. Y! ]kfifo 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

4 K) z. P4 n  r- N
谢谢分享
0 {- E. g2 K3 b, `  \) K. t! `以前搞过ram模拟fifo，还没用过环形fifo，学习学习。
7 ?9 j/ G+ A2 @9 D9 B
0 L5 ^# b; S. g' x* o$ J

感谢楼主分享

这个程序例程很受用，也谢谢楼主的分享了。

. q+ v% }) F3 I8 r& [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
$ E9 R4 p5 }6 MC语言数据结构里面有，很快就可以实现！！！

. z7 b# f! g$ n7 i# d9 b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

% G9 A+ F; v9 Q" H可以去GitHub，有完整的工程。

XinLiYF 发表于 2018-3-7 16:13
1 P* }7 F5 k8 {4 P) T% Z可以去GitHub，有完整的工程。

亲 可以给个链接吗