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Tue May 26 17:28:56 2015 UTC (9 years, 9 months ago) by amb
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Tue May 26 17:28:56 2015 UTC (9 years, 9 months ago) by amb
File MIME type: text/x-chdr
File size: 9164 byte(s)
Merge branch 'MSVC' back into the trunk.
| 1 | /*************************************** |
| 2 | Functions to maintain an in-RAM cache of on-disk data for slim mode. |
| 3 | |
| 4 | Part of the Routino routing software. |
| 5 | ******************/ /****************** |
| 6 | This file Copyright 2013-2015 Andrew M. Bishop |
| 7 | |
| 8 | This program is free software: you can redistribute it and/or modify |
| 9 | it under the terms of the GNU Affero General Public License as published by |
| 10 | the Free Software Foundation, either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU Affero General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU Affero General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 20 | ***************************************/ |
| 21 | |
| 22 | |
| 23 | #if SLIM |
| 24 | |
| 25 | #ifndef CACHE_H |
| 26 | #define CACHE_H /*+ To stop multiple inclusions. +*/ |
| 27 | |
| 28 | #include <stdlib.h> |
| 29 | |
| 30 | #include "types.h" |
| 31 | |
| 32 | |
| 33 | /* Macros for constants */ |
| 34 | |
| 35 | #define CACHEWIDTH 8192 /*+ The width of the cache. +*/ |
| 36 | #define CACHEDEPTH 16 /*+ The depth of the cache. +*/ |
| 37 | |
| 38 | |
| 39 | /* Macro for structure forward declaration */ |
| 40 | |
| 41 | #define CACHE_STRUCTURE_FWD(type) typedef struct _##type##Cache type##Cache; |
| 42 | |
| 43 | |
| 44 | /* Macro for structure declaration */ |
| 45 | |
| 46 | /*+ A macro to create a cache structure. +*/ |
| 47 | #define CACHE_STRUCTURE(type) \ |
| 48 | \ |
| 49 | struct _##type##Cache \ |
| 50 | { \ |
| 51 | int first [CACHEWIDTH]; /*+ The first entry to fill +*/ \ |
| 52 | \ |
| 53 | type data [CACHEWIDTH][CACHEDEPTH]; /*+ The array of type##s. +*/ \ |
| 54 | index_t indices[CACHEWIDTH][CACHEDEPTH]; /*+ The array of indexes. +*/ \ |
| 55 | }; |
| 56 | |
| 57 | |
| 58 | /* Macros for function prototypes */ |
| 59 | |
| 60 | #define CACHE_NEWCACHE_PROTO(type) static inline type##Cache *New##type##Cache(void); |
| 61 | |
| 62 | #define CACHE_DELETECACHE_PROTO(type) static inline void Delete##type##Cache(type##Cache *cache); |
| 63 | |
| 64 | #define CACHE_FETCHCACHE_PROTO(type) static inline type *FetchCached##type(type##Cache *cache,index_t index,int fd,off_t offset); |
| 65 | |
| 66 | #define CACHE_REPLACECACHE_PROTO(type) static inline void ReplaceCached##type(type##Cache *cache,type *value,index_t index,int fd,off_t offset); |
| 67 | |
| 68 | #define CACHE_INVALIDATECACHE_PROTO(type) static inline void Invalidate##type##Cache(type##Cache *cache); |
| 69 | |
| 70 | |
| 71 | /* Macros for function definitions */ |
| 72 | |
| 73 | /*+ A macro to create a function that creates a new cache data structure. +*/ |
| 74 | #define CACHE_NEWCACHE(type) \ |
| 75 | \ |
| 76 | static inline type##Cache *New##type##Cache(void) \ |
| 77 | { \ |
| 78 | type##Cache *cache; \ |
| 79 | \ |
| 80 | cache=(type##Cache*)malloc(sizeof(type##Cache)); \ |
| 81 | \ |
| 82 | Invalidate##type##Cache(cache); \ |
| 83 | \ |
| 84 | return(cache); \ |
| 85 | } |
| 86 | |
| 87 | |
| 88 | /*+ A macro to create a function that deletes a cache data structure. +*/ |
| 89 | #define CACHE_DELETECACHE(type) \ |
| 90 | \ |
| 91 | static inline void Delete##type##Cache(type##Cache *cache) \ |
| 92 | { \ |
| 93 | free(cache); \ |
| 94 | } |
| 95 | |
| 96 | |
| 97 | /*+ A macro to create a function that fetches an item from a cache data structure or reads from file. +*/ |
| 98 | #define CACHE_FETCHCACHE(type) \ |
| 99 | \ |
| 100 | static inline type *FetchCached##type(type##Cache *cache,index_t index,int fd,off_t offset) \ |
| 101 | { \ |
| 102 | int row=index%CACHEWIDTH; \ |
| 103 | int col; \ |
| 104 | \ |
| 105 | for(col=0;col<CACHEDEPTH;col++) \ |
| 106 | if(cache->indices[row][col]==index) \ |
| 107 | return(&cache->data[row][col]); \ |
| 108 | \ |
| 109 | col=cache->first[row]; \ |
| 110 | \ |
| 111 | cache->first[row]=(cache->first[row]+1)%CACHEDEPTH; \ |
| 112 | \ |
| 113 | SlimFetch(fd,&cache->data[row][col],sizeof(type),offset+(off_t)index*sizeof(type)); \ |
| 114 | \ |
| 115 | cache->indices[row][col]=index; \ |
| 116 | \ |
| 117 | return(&cache->data[row][col]); \ |
| 118 | } |
| 119 | |
| 120 | |
| 121 | /*+ A macro to create a function that replaces an item in a cache data structure and writes to file. +*/ |
| 122 | #define CACHE_REPLACECACHE(type) \ |
| 123 | \ |
| 124 | static inline void ReplaceCached##type(type##Cache *cache,type *value,index_t index,int fd,off_t offset) \ |
| 125 | { \ |
| 126 | int row=index%CACHEWIDTH; \ |
| 127 | int col; \ |
| 128 | \ |
| 129 | for(col=0;col<CACHEDEPTH;col++) \ |
| 130 | if(cache->indices[row][col]==index) \ |
| 131 | break; \ |
| 132 | \ |
| 133 | if(col==CACHEDEPTH) \ |
| 134 | { \ |
| 135 | col=cache->first[row]; \ |
| 136 | \ |
| 137 | cache->first[row]=(cache->first[row]+1)%CACHEDEPTH; \ |
| 138 | } \ |
| 139 | \ |
| 140 | cache->indices[row][col]=index; \ |
| 141 | \ |
| 142 | cache->data[row][col]=*value; \ |
| 143 | \ |
| 144 | SlimReplace(fd,&cache->data[row][col],sizeof(type),offset+(off_t)index*sizeof(type)); \ |
| 145 | } |
| 146 | |
| 147 | |
| 148 | /*+ A macro to create a function that invalidates the contents of a cache data structure. +*/ |
| 149 | #define CACHE_INVALIDATECACHE(type) \ |
| 150 | \ |
| 151 | static inline void Invalidate##type##Cache(type##Cache *cache) \ |
| 152 | { \ |
| 153 | int row,col; \ |
| 154 | \ |
| 155 | for(row=0;row<CACHEWIDTH;row++) \ |
| 156 | { \ |
| 157 | cache->first[row]=0; \ |
| 158 | \ |
| 159 | for(col=0;col<CACHEDEPTH;col++) \ |
| 160 | cache->indices[row][col]=NO_NODE; \ |
| 161 | } \ |
| 162 | } |
| 163 | |
| 164 | |
| 165 | /*+ Cache data structure forward declarations (for planetsplitter). +*/ |
| 166 | CACHE_STRUCTURE_FWD(NodeX) |
| 167 | CACHE_STRUCTURE_FWD(SegmentX) |
| 168 | CACHE_STRUCTURE_FWD(WayX) |
| 169 | |
| 170 | /*+ Cache data structure forward declarations (for router). +*/ |
| 171 | CACHE_STRUCTURE_FWD(Node) |
| 172 | CACHE_STRUCTURE_FWD(Segment) |
| 173 | CACHE_STRUCTURE_FWD(Way) |
| 174 | CACHE_STRUCTURE_FWD(TurnRelation) |
| 175 | |
| 176 | |
| 177 | #endif /* CACHE_H */ |
| 178 | |
| 179 | #endif /* SLIM */ |