1 #ifndef CACHES_QUEUES_LISTS_H 2 #define CACHES_QUEUES_LISTS_H 3 /* 4 * Create a squashfs filesystem. This is a highly compressed read only 5 * filesystem. 6 * 7 * Copyright (c) 2013, 2014 8 * Phillip Lougher <phillip (at) squashfs.org.uk> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 2, 13 * or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 23 * 24 * caches-queues-lists.h 25 */ 26 27 #define INSERT_LIST(NAME, TYPE) \ 28 void insert_##NAME##_list(TYPE **list, TYPE *entry) { \ 29 if(*list) { \ 30 entry->NAME##_next = *list; \ 31 entry->NAME##_prev = (*list)->NAME##_prev; \ 32 (*list)->NAME##_prev->NAME##_next = entry; \ 33 (*list)->NAME##_prev = entry; \ 34 } else { \ 35 *list = entry; \ 36 entry->NAME##_prev = entry->NAME##_next = entry; \ 37 } \ 38 } 39 40 41 #define REMOVE_LIST(NAME, TYPE) \ 42 void remove_##NAME##_list(TYPE **list, TYPE *entry) { \ 43 if(entry->NAME##_prev == entry && entry->NAME##_next == entry) { \ 44 /* only this entry in the list */ \ 45 *list = NULL; \ 46 } else if(entry->NAME##_prev != NULL && entry->NAME##_next != NULL) { \ 47 /* more than one entry in the list */ \ 48 entry->NAME##_next->NAME##_prev = entry->NAME##_prev; \ 49 entry->NAME##_prev->NAME##_next = entry->NAME##_next; \ 50 if(*list == entry) \ 51 *list = entry->NAME##_next; \ 52 } \ 53 entry->NAME##_prev = entry->NAME##_next = NULL; \ 54 } 55 56 57 #define INSERT_HASH_TABLE(NAME, TYPE, HASH_FUNCTION, FIELD, LINK) \ 58 void insert_##NAME##_hash_table(TYPE *container, struct file_buffer *entry) \ 59 { \ 60 int hash = HASH_FUNCTION(entry->FIELD); \ 61 \ 62 entry->LINK##_next = container->hash_table[hash]; \ 63 container->hash_table[hash] = entry; \ 64 entry->LINK##_prev = NULL; \ 65 if(entry->LINK##_next) \ 66 entry->LINK##_next->LINK##_prev = entry; \ 67 } 68 69 70 #define REMOVE_HASH_TABLE(NAME, TYPE, HASH_FUNCTION, FIELD, LINK) \ 71 void remove_##NAME##_hash_table(TYPE *container, struct file_buffer *entry) \ 72 { \ 73 if(entry->LINK##_prev) \ 74 entry->LINK##_prev->LINK##_next = entry->LINK##_next; \ 75 else \ 76 container->hash_table[HASH_FUNCTION(entry->FIELD)] = \ 77 entry->LINK##_next; \ 78 if(entry->LINK##_next) \ 79 entry->LINK##_next->LINK##_prev = entry->LINK##_prev; \ 80 \ 81 entry->LINK##_prev = entry->LINK##_next = NULL; \ 82 } 83 84 #define HASH_SIZE 65536 85 #define CALCULATE_HASH(n) ((n) & 0xffff) 86 87 88 /* struct describing a cache entry passed between threads */ 89 struct file_buffer { 90 union { 91 long long index; 92 long long sequence; 93 }; 94 long long file_size; 95 union { 96 long long block; 97 unsigned short checksum; 98 }; 99 struct cache *cache; 100 union { 101 struct file_info *dupl_start; 102 struct file_buffer *hash_next; 103 }; 104 union { 105 int duplicate; 106 struct file_buffer *hash_prev; 107 }; 108 union { 109 struct { 110 struct file_buffer *free_next; 111 struct file_buffer *free_prev; 112 }; 113 struct { 114 struct file_buffer *seq_next; 115 struct file_buffer *seq_prev; 116 }; 117 }; 118 int size; 119 int c_byte; 120 char used; 121 char fragment; 122 char error; 123 char locked; 124 char wait_on_unlock; 125 char noD; 126 char data[0]; 127 }; 128 129 130 /* struct describing queues used to pass data between threads */ 131 struct queue { 132 int size; 133 int readp; 134 int writep; 135 pthread_mutex_t mutex; 136 pthread_cond_t empty; 137 pthread_cond_t full; 138 void **data; 139 }; 140 141 142 /* 143 * struct describing seq_queues used to pass data between the read 144 * thread and the deflate and main threads 145 */ 146 struct seq_queue { 147 int fragment_count; 148 int block_count; 149 struct file_buffer *hash_table[HASH_SIZE]; 150 pthread_mutex_t mutex; 151 pthread_cond_t wait; 152 }; 153 154 155 /* Cache status struct. Caches are used to keep 156 track of memory buffers passed between different threads */ 157 struct cache { 158 int max_buffers; 159 int count; 160 int buffer_size; 161 int noshrink_lookup; 162 int first_freelist; 163 union { 164 int used; 165 int max_count; 166 }; 167 pthread_mutex_t mutex; 168 pthread_cond_t wait_for_free; 169 pthread_cond_t wait_for_unlock; 170 struct file_buffer *free_list; 171 struct file_buffer *hash_table[HASH_SIZE]; 172 }; 173 174 175 extern struct queue *queue_init(int); 176 extern void queue_put(struct queue *, void *); 177 extern void *queue_get(struct queue *); 178 extern int queue_empty(struct queue *); 179 extern void queue_flush(struct queue *); 180 extern void dump_queue(struct queue *); 181 extern struct seq_queue *seq_queue_init(); 182 extern void seq_queue_put(struct seq_queue *, struct file_buffer *); 183 extern void dump_seq_queue(struct seq_queue *, int); 184 extern struct file_buffer *seq_queue_get(struct seq_queue *); 185 extern void seq_queue_flush(struct seq_queue *); 186 extern struct cache *cache_init(int, int, int, int); 187 extern struct file_buffer *cache_lookup(struct cache *, long long); 188 extern struct file_buffer *cache_get(struct cache *, long long); 189 extern struct file_buffer *cache_get_nohash(struct cache *); 190 extern void cache_hash(struct file_buffer *, long long); 191 extern void cache_block_put(struct file_buffer *); 192 extern void dump_cache(struct cache *); 193 extern struct file_buffer *cache_get_nowait(struct cache *, long long); 194 extern struct file_buffer *cache_lookup_nowait(struct cache *, long long, 195 char *); 196 extern void cache_wait_unlock(struct file_buffer *); 197 extern void cache_unlock(struct file_buffer *); 198 199 extern int first_freelist; 200 #endif 201
