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4429 | Serge | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2010. All rights reserved. ;; |
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4 | ;; Distributed under terms of the GNU General Public License ;; |
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5 | ;; ;; |
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6 | ;; queue.inc ;; |
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7 | ;; ;; |
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8 | ;; Written by hidnplayr@kolibrios.org ;; |
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9 | ;; ;; |
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10 | ;; GNU GENERAL PUBLIC LICENSE ;; |
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11 | ;; Version 2, June 1991 ;; |
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12 | ;; ;; |
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13 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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14 | |||
15 | $Revision: 2305 $ |
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16 | |||
17 | ; The Queues implemented by these macros form a ring-buffer. |
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18 | ; The data to these queue's always looks like this: |
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19 | ; |
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20 | ; At top, you have the queue struct, wich has the size (number of currently queued packets, read and write pointers. |
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21 | ; This struct is followed by a number of slots wich you can read and write to using the macros. |
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22 | ; How these slots look like is up to you to chose, normally they should have at least a pointer to where the real data is. |
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23 | ; (you can see some examples below) |
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24 | |||
25 | |||
26 | struct queue |
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27 | |||
28 | size dd ? ; number of queued packets in this queue |
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29 | w_ptr dd ? ; current writing pointer in queue |
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30 | r_ptr dd ? ; current reading pointer |
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31 | mutex MUTEX |
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32 | |||
33 | ends |
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34 | |||
35 | ; The following macros share these inputs: |
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36 | |||
37 | ; ptr = pointer to where the queue data is located |
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38 | ; size = number of slots/entrys in the queue |
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39 | ; entry_size = size of one slot, in bytes |
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40 | ; failaddr = the address where macro will jump to when there is no data in the queue |
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41 | |||
42 | ; additionally, add_to_queue requires you to set esi to the data wich you want to queue |
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43 | ; get_from_queue on the other hand will return a pointer in esi, to the entry you're interessed in |
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44 | ; PS: macros WILL destroy ecx and edi |
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45 | |||
46 | macro add_to_queue ptr, size, entry_size, failaddr { |
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47 | |||
48 | local .ok, .no_wrap |
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49 | |||
50 | pusha |
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51 | lea ecx, [ptr + queue.mutex] |
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52 | call mutex_lock |
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53 | popa |
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54 | |||
55 | cmp [ptr + queue.size], size ; Check if queue isnt full |
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56 | jb .ok |
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57 | |||
58 | pusha |
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59 | lea ecx, [ptr + queue.mutex] |
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60 | call mutex_unlock |
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61 | popa |
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62 | jmp failaddr |
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63 | |||
64 | .ok: |
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65 | inc [ptr + queue.size] ; if not full, queue one more |
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66 | |||
67 | mov edi, [ptr + queue.w_ptr] ; Current write pointer (FIFO!) |
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68 | mov ecx, entry_size/4 ; Write the queue entry |
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69 | rep movsd ; |
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70 | |||
71 | lea ecx, [size*entry_size+ptr+sizeof.queue] |
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72 | cmp edi, ecx ; entry size |
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73 | jb .no_wrap |
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74 | |||
75 | sub edi, size*entry_size |
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76 | .no_wrap: |
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77 | mov [ptr + queue.w_ptr], edi |
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78 | |||
79 | pusha |
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80 | lea ecx, [ptr + queue.mutex] |
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81 | call mutex_unlock |
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82 | popa |
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83 | |||
84 | } |
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85 | |||
86 | |||
87 | |||
88 | macro get_from_queue ptr, size, entry_size, failaddr { |
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89 | |||
90 | local .ok, .no_wrap |
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91 | |||
92 | pusha |
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93 | lea ecx, [ptr + queue.mutex] |
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94 | call mutex_lock |
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95 | popa |
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96 | |||
97 | cmp [ptr + queue.size], 0 ; any packets queued? |
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98 | ja .ok |
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99 | |||
100 | pusha |
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101 | lea ecx, [ptr + queue.mutex] |
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102 | call mutex_unlock |
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103 | popa |
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104 | jmp failaddr |
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105 | |||
106 | .ok: |
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107 | dec [ptr + queue.size] ; if so, dequeue one |
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108 | |||
109 | mov esi, [ptr + queue.r_ptr] |
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110 | push esi |
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111 | |||
112 | add esi, entry_size |
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113 | |||
114 | lea ecx, [size*entry_size+ptr+sizeof.queue] |
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115 | cmp esi, ecx ; entry size |
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116 | jb .no_wrap |
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117 | |||
118 | sub esi, size*entry_size |
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119 | |||
120 | .no_wrap: |
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121 | mov dword [ptr + queue.r_ptr], esi |
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122 | |||
123 | pop esi |
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124 | |||
125 | pusha |
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126 | lea ecx, [ptr + queue.mutex] |
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127 | call mutex_unlock |
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128 | popa |
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129 | |||
130 | } |
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131 | |||
132 | macro init_queue ptr { |
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133 | |||
134 | mov [ptr + queue.size] , 0 |
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135 | lea edi, [ptr + sizeof.queue] |
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136 | mov [ptr + queue.w_ptr], edi |
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137 | mov [ptr + queue.r_ptr], edi |
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138 | |||
139 | lea ecx, [ptr + queue.mutex] |
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140 | call mutex_init |
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141 | } |