Benny Prijono | 4766ffe | 2005-11-01 17:56:59 +0000 | [diff] [blame] | 1 | /* $Id$ |
Benny Prijono | dd859a6 | 2005-11-01 16:42:51 +0000 | [diff] [blame] | 2 | */ |
| 3 | #include <pj/pool.h> |
| 4 | #include <pj/log.h> |
| 5 | #include <pj/except.h> |
| 6 | #include <pj/assert.h> |
| 7 | #include <pj/os.h> |
| 8 | #include <pj/compat/sprintf.h> |
| 9 | |
| 10 | /* Include inline definitions when inlining is disabled. */ |
| 11 | #if !PJ_FUNCTIONS_ARE_INLINED |
| 12 | # include <pj/pool_i.h> |
| 13 | #endif |
| 14 | |
| 15 | #define LOG(expr) PJ_LOG(5,expr) |
| 16 | |
| 17 | int PJ_NO_MEMORY_EXCEPTION; |
| 18 | |
| 19 | /* |
| 20 | * Create new block. |
| 21 | * Create a new big chunk of memory block, from which user allocation will be |
| 22 | * taken from. |
| 23 | */ |
| 24 | static pj_pool_block *pj_pool_create_block( pj_pool_t *pool, pj_size_t size) |
| 25 | { |
| 26 | pj_pool_block *block; |
| 27 | |
| 28 | PJ_CHECK_STACK(); |
| 29 | pj_assert(size >= sizeof(pj_pool_block)); |
| 30 | |
| 31 | LOG((pool->obj_name, "create_block(sz=%u), cur.cap=%u, cur.used=%u", |
| 32 | size, pool->capacity, pool->used_size)); |
| 33 | |
| 34 | /* Request memory from allocator. */ |
| 35 | block = (pj_pool_block*) |
| 36 | (*pool->factory->policy.block_alloc)(pool->factory, size); |
| 37 | if (block == NULL) { |
| 38 | (*pool->callback)(pool, size); |
| 39 | return NULL; |
| 40 | } |
| 41 | |
| 42 | /* Add capacity. */ |
| 43 | pool->capacity += size; |
| 44 | pool->used_size += sizeof(pj_pool_block); |
| 45 | |
| 46 | /* Set block attribytes. */ |
| 47 | block->cur = block->buf = ((unsigned char*)block) + sizeof(pj_pool_block); |
| 48 | block->end = ((unsigned char*)block) + size; |
| 49 | |
| 50 | /* Insert in the front of the list. */ |
| 51 | pj_list_insert_after(&pool->block_list, block); |
| 52 | |
| 53 | LOG((pool->obj_name," block created, buffer=%p-%p",block->buf, block->end)); |
| 54 | |
| 55 | return block; |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * Allocate memory chunk for user from available blocks. |
| 60 | * This will iterate through block list to find space to allocate the chunk. |
| 61 | * If no space is available in all the blocks, a new block might be created |
| 62 | * (depending on whether the pool is allowed to resize). |
| 63 | */ |
| 64 | PJ_DEF(void*) pj_pool_allocate_find(pj_pool_t *pool, unsigned size) |
| 65 | { |
| 66 | pj_pool_block *block = pool->block_list.next; |
| 67 | void *p; |
| 68 | unsigned block_size; |
| 69 | |
| 70 | PJ_CHECK_STACK(); |
| 71 | |
| 72 | while (block != &pool->block_list) { |
| 73 | p = pj_pool_alloc_from_block(pool, block, size); |
| 74 | if (p != NULL) |
| 75 | return p; |
| 76 | block = block->next; |
| 77 | } |
| 78 | /* No available space in all blocks. */ |
| 79 | |
| 80 | /* If pool is configured NOT to expand, return error. */ |
| 81 | if (pool->increment_size == 0) { |
| 82 | LOG((pool->obj_name, "Can't expand pool to allocate %u bytes " |
| 83 | "(used=%u, cap=%u)", |
| 84 | size, pool->used_size, pool->capacity)); |
| 85 | (*pool->callback)(pool, size); |
| 86 | return NULL; |
| 87 | } |
| 88 | |
| 89 | /* If pool is configured to expand, but the increment size |
| 90 | * is less than the required size, expand the pool by multiple |
| 91 | * increment size |
| 92 | */ |
| 93 | if (pool->increment_size < size + sizeof(pj_pool_block)) { |
| 94 | unsigned count; |
| 95 | count = (size + pool->increment_size + sizeof(pj_pool_block)) / |
| 96 | pool->increment_size; |
| 97 | block_size = count * pool->increment_size; |
| 98 | |
| 99 | } else { |
| 100 | block_size = pool->increment_size; |
| 101 | } |
| 102 | |
| 103 | LOG((pool->obj_name, |
| 104 | "%u bytes requested, resizing pool by %u bytes (used=%u, cap=%u)", |
| 105 | size, block_size, pool->used_size, pool->capacity)); |
| 106 | |
| 107 | block = pj_pool_create_block(pool, block_size); |
| 108 | if (!block) |
| 109 | return NULL; |
| 110 | |
| 111 | p = pj_pool_alloc_from_block(pool, block, size); |
| 112 | pj_assert(p != NULL); |
| 113 | #if PJ_DEBUG |
| 114 | if (p == NULL) { |
| 115 | p = p; |
| 116 | } |
| 117 | #endif |
| 118 | return p; |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Internal function to initialize pool. |
| 123 | */ |
| 124 | PJ_DEF(void) pj_pool_init_int( pj_pool_t *pool, |
| 125 | const char *name, |
| 126 | pj_size_t increment_size, |
| 127 | pj_pool_callback *callback) |
| 128 | { |
| 129 | pj_pool_block *block; |
| 130 | |
| 131 | PJ_CHECK_STACK(); |
| 132 | |
| 133 | pool->increment_size = increment_size; |
| 134 | pool->callback = callback; |
| 135 | pool->used_size = sizeof(*pool); |
| 136 | block = pool->block_list.next; |
| 137 | while (block != &pool->block_list) { |
| 138 | pool->used_size += sizeof(pj_pool_block); |
| 139 | block = block->next; |
| 140 | } |
| 141 | |
| 142 | if (name) { |
| 143 | if (strchr(name, '%') != NULL) { |
| 144 | sprintf(pool->obj_name, name, pool); |
| 145 | } else { |
| 146 | strncpy(pool->obj_name, name, PJ_MAX_OBJ_NAME); |
| 147 | } |
| 148 | } else { |
| 149 | pool->obj_name[0] = '\0'; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * Create new memory pool. |
| 155 | */ |
| 156 | PJ_DEF(pj_pool_t*) pj_pool_create_int( pj_pool_factory *f, const char *name, |
| 157 | pj_size_t initial_size, |
| 158 | pj_size_t increment_size, |
| 159 | pj_pool_callback *callback) |
| 160 | { |
| 161 | pj_pool_t *pool; |
| 162 | pj_pool_block *block; |
| 163 | unsigned char *buffer; |
| 164 | |
| 165 | PJ_CHECK_STACK(); |
| 166 | |
| 167 | buffer = (*f->policy.block_alloc)(f, initial_size); |
| 168 | if (!buffer) |
| 169 | return NULL; |
| 170 | |
| 171 | /* Set pool administrative data. */ |
| 172 | pool = (pj_pool_t*)buffer; |
| 173 | pj_memset(pool, 0, sizeof(*pool)); |
| 174 | |
| 175 | pj_list_init(&pool->block_list); |
| 176 | pool->factory = f; |
| 177 | |
| 178 | /* Create the first block from the memory. */ |
| 179 | block = (pj_pool_block*) (buffer + sizeof(*pool)); |
| 180 | block->cur = block->buf = ((unsigned char*)block) + sizeof(pj_pool_block); |
| 181 | block->end = buffer + initial_size; |
| 182 | pj_list_insert_after(&pool->block_list, block); |
| 183 | |
| 184 | pj_pool_init_int(pool, name, increment_size, callback); |
| 185 | |
| 186 | /* Pool initial capacity and used size */ |
| 187 | pool->capacity = initial_size; |
| 188 | |
| 189 | LOG((pool->obj_name, "pool created, size=%u", pool->capacity)); |
| 190 | return pool; |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * Reset the pool to the state when it was created. |
| 195 | * All blocks will be deallocated except the first block. All memory areas |
| 196 | * are marked as free. |
| 197 | */ |
| 198 | static void reset_pool(pj_pool_t *pool) |
| 199 | { |
| 200 | pj_pool_block *block; |
| 201 | |
| 202 | PJ_CHECK_STACK(); |
| 203 | |
| 204 | block = pool->block_list.prev; |
| 205 | if (block == &pool->block_list) |
| 206 | return; |
| 207 | |
| 208 | /* Skip the first block because it is occupying the same memory |
| 209 | as the pool itself. |
| 210 | */ |
| 211 | block = block->prev; |
| 212 | |
| 213 | while (block != &pool->block_list) { |
| 214 | pj_pool_block *prev = block->prev; |
| 215 | pj_list_erase(block); |
| 216 | (*pool->factory->policy.block_free)(pool->factory, block, |
| 217 | block->end - (unsigned char*)block); |
| 218 | block = prev; |
| 219 | } |
| 220 | |
| 221 | block = pool->block_list.next; |
| 222 | block->cur = block->buf; |
| 223 | pool->capacity = block->end - (unsigned char*)pool; |
| 224 | pool->used_size = 0; |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * The public function to reset pool. |
| 229 | */ |
| 230 | PJ_DEF(void) pj_pool_reset(pj_pool_t *pool) |
| 231 | { |
| 232 | LOG((pool->obj_name, "reset(): cap=%d, used=%d(%d%%)", |
| 233 | pool->capacity, pool->used_size, pool->used_size*100/pool->capacity)); |
| 234 | |
| 235 | reset_pool(pool); |
| 236 | } |
| 237 | |
| 238 | /* |
| 239 | * Destroy the pool. |
| 240 | */ |
| 241 | PJ_DEF(void) pj_pool_destroy_int(pj_pool_t *pool) |
| 242 | { |
| 243 | pj_size_t initial_size; |
| 244 | |
| 245 | LOG((pool->obj_name, "destroy(): cap=%d, used=%d(%d%%), block0=%p-%p", |
| 246 | pool->capacity, pool->used_size, pool->used_size*100/pool->capacity, |
| 247 | ((pj_pool_block*)pool->block_list.next)->buf, |
| 248 | ((pj_pool_block*)pool->block_list.next)->end)); |
| 249 | |
| 250 | reset_pool(pool); |
| 251 | initial_size = ((pj_pool_block*)pool->block_list.next)->end - |
| 252 | (unsigned char*)pool; |
| 253 | (*pool->factory->policy.block_free)(pool->factory, pool, initial_size); |
| 254 | } |
| 255 | |
| 256 | |