Showing the changes to sys/src/cmd/python/Modules/_sqlite/cache.h (1 of 3706 files). Show all
Unified · Split
| @@ -0,0 +1,73 @@ | ||
| 1 | +/* cache.h - definitions for the LRU cache | |
| 2 | + * | |
| 3 | + * Copyright (C) 2004-2006 Gerhard H�ring <gh@ghaering.de> | |
| 4 | + * | |
| 5 | + * This file is part of pysqlite. | |
| 6 | + * | |
| 7 | + * This software is provided 'as-is', without any express or implied | |
| 8 | + * warranty. In no event will the authors be held liable for any damages | |
| 9 | + * arising from the use of this software. | |
| 10 | + * | |
| 11 | + * Permission is granted to anyone to use this software for any purpose, | |
| 12 | + * including commercial applications, and to alter it and redistribute it | |
| 13 | + * freely, subject to the following restrictions: | |
| 14 | + * | |
| 15 | + * 1. The origin of this software must not be misrepresented; you must not | |
| 16 | + * claim that you wrote the original software. If you use this software | |
| 17 | + * in a product, an acknowledgment in the product documentation would be | |
| 18 | + * appreciated but is not required. | |
| 19 | + * 2. Altered source versions must be plainly marked as such, and must not be | |
| 20 | + * misrepresented as being the original software. | |
| 21 | + * 3. This notice may not be removed or altered from any source distribution. | |
| 22 | + */ | |
| 23 | + | |
| 24 | +#ifndef PYSQLITE_CACHE_H | |
| 25 | +#define PYSQLITE_CACHE_H | |
| 26 | +#include "Python.h" | |
| 27 | + | |
| 28 | +/* The LRU cache is implemented as a combination of a doubly-linked with a | |
| 29 | + * dictionary. The list items are of type 'Node' and the dictionary has the | |
| 30 | + * nodes as values. */ | |
| 31 | + | |
| 32 | +typedef struct _Node | |
| 33 | +{ | |
| 34 | + PyObject_HEAD | |
| 35 | + PyObject* key; | |
| 36 | + PyObject* data; | |
| 37 | + long count; | |
| 38 | + struct _Node* prev; | |
| 39 | + struct _Node* next; | |
| 40 | +} Node; | |
| 41 | + | |
| 42 | +typedef struct | |
| 43 | +{ | |
| 44 | + PyObject_HEAD | |
| 45 | + int size; | |
| 46 | + | |
| 47 | + /* a dictionary mapping keys to Node entries */ | |
| 48 | + PyObject* mapping; | |
| 49 | + | |
| 50 | + /* the factory callable */ | |
| 51 | + PyObject* factory; | |
| 52 | + | |
| 53 | + Node* first; | |
| 54 | + Node* last; | |
| 55 | + | |
| 56 | + /* if set, decrement the factory function when the Cache is deallocated. | |
| 57 | + * this is almost always desirable, but not in the pysqlite context */ | |
| 58 | + int decref_factory; | |
| 59 | +} Cache; | |
| 60 | + | |
| 61 | +extern PyTypeObject NodeType; | |
| 62 | +extern PyTypeObject CacheType; | |
| 63 | + | |
| 64 | +int node_init(Node* self, PyObject* args, PyObject* kwargs); | |
| 65 | +void node_dealloc(Node* self); | |
| 66 | + | |
| 67 | +int cache_init(Cache* self, PyObject* args, PyObject* kwargs); | |
| 68 | +void cache_dealloc(Cache* self); | |
| 69 | +PyObject* cache_get(Cache* self, PyObject* args); | |
| 70 | + | |
| 71 | +int cache_setup_types(void); | |
| 72 | + | |
| 73 | +#endif | |