b*tree,  i am looking for a C implementation  - Page 1
Forum section: electronics / general

author: legacy
author_rank: Super Contributor
timestamp: March 01, 2015, 12:43:32 am
content: hi guysi am toying with binary trees, i have implemented avl-tree, but now i need b*treeany good implementation around in C ? (and, possibly written without recursion)thank you

author: legacy
author_rank: Super Contributor
timestamp: March 13, 2015, 01:30:39 am
content: anyone ?i have realized a tiny B-tree allocator, block orientedi am not sure it's working, more tests are needed(also sources are very dirty, can't be useful to post them at this ugly stage)this is the distribution {1 .. 4000}Code:{ 250 501 752 1003 1254 1505 1756 2007 2258 2509 2760 3011 3262 3513 }{ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 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author: SL4P
author_rank: Super Contributor
timestamp: March 13, 2015, 03:33:32 am
content: keen to see where you end up...sorry for not contributing, but I'm interested to see how it ends without recursion!thanks for posting your updates

author: legacy
author_rank: Super Contributor
timestamp: March 13, 2015, 07:31:33 am
content: i feel, that's my end up

author: Howardlong
author_rank: Super Contributor
timestamp: March 13, 2015, 09:35:16 am
content: Quote from: mojo-chan on March 13, 2015, 09:19:12 amDepending on the environment I have to agree, but I am not sure if the OP is using an MCU. If I possibly can, I have to say as a rule of thumb I avoid any non-deterministic heap operations in embedded systems, testing becomes just too hard. In fact I avoid non-deterministic things anyway!Of course you don't have to implement these kinds of structures on a heap, but that is the traditional way. But then again, depending on the requirement, you might not need to use a b-tree at all.

author: legacy
author_rank: Super Contributor
timestamp: March 13, 2015, 10:26:42 am
content: heap ? who has ever talked about dynamic memory, malloc and such a stuff ? I have to use LBA block that means static array of 512byte blocks! My lo level primitives are not using pointers in any way, and i do not have any malloc and free, my low level primitive to data-struct are disk_block_get, disk_bloc_put, as this algorithm has be used for a btrfs filesysem, i am trying to improve myold toy-filesystemwith a new completely new design in where i want to use btree instread of bitmap.The target is an embedded SoC, Atheros5 @ 400Mhz, and this activity is for my personal research (that may be open sources released, once completed)

author: diyaudio
author_rank: Frequent Contributor
timestamp: March 13, 2015, 12:41:43 pm
content: Quote from: legacy on March 01, 2015, 12:43:32 amInteresting. What is your application for using this??... IMHO don't think its possible to perform a best first algorithm with out recursive on a tree.. how many nodes are we looking at worse case?

author: Howardlong
author_rank: Super Contributor
timestamp: March 13, 2015, 01:04:07 pm
content: Quote from: legacy on March 13, 2015, 10:26:42 amThe academically sanctioned way with these algorithms is typically done with a heap, I guess I just assumed that was what you were using! I definitely prefer static or pre-allocation if possible and appropriate in resource-limited systems, simplifies testing and error handling.