函数buf_pool_init_instance

buff_pool_t 结构体 详见

/********************************************************************//**
Initialize a buffer pool instance.
@return DB_SUCCESS if all goes well. */
UNIV_INTERN
ulint
buf_pool_init_instance(
/*===================*/
    buf_pool_t*    buf_pool,    /*!< in: buffer pool instance */
    ulint        buf_pool_size,    /*!< in: size in bytes */
    ulint        instance_no)    /*!< in: id of the instance */
{
    ulint        i;
    buf_chunk_t*    chunk;
 
    /* 1. Initialize general fields
    ------------------------------- */
    mutex_create(buf_pool_mutex_key,
             &buf_pool->mutex, SYNC_BUF_POOL);
    mutex_create(buf_pool_zip_mutex_key,
             &buf_pool->zip_mutex, SYNC_BUF_BLOCK);
 
    buf_pool_mutex_enter(buf_pool);
 
    if (buf_pool_size > ) {
        buf_pool->n_chunks = ;
        buf_pool->chunks = chunk = mem_zalloc(sizeof *chunk);
 
        UT_LIST_INIT(buf_pool->free);
        /**
         *为chunk->mem分配buf_pool_size大小的内存,该内存大小须能被16K整除
         *每16K对应一个frame,也对应一个控制chunk
         */
        if (!buf_chunk_init(buf_pool, chunk, buf_pool_size)) { //详见
            mem_free(chunk);
            mem_free(buf_pool);
 
            buf_pool_mutex_exit(buf_pool);
 
            return(DB_ERROR);
        }
 
        buf_pool->instance_no = instance_no;
        buf_pool->old_pool_size = buf_pool_size;
        buf_pool->curr_size = chunk->size;
        buf_pool->curr_pool_size = buf_pool->curr_size * UNIV_PAGE_SIZE;
 
        buf_pool->page_hash = hash_create( * buf_pool->curr_size);
        buf_pool->zip_hash = hash_create( * buf_pool->curr_size);
 
        buf_pool->last_printout_time = ut_time();
    }
    /* 2. Initialize flushing fields
    -------------------------------- */
 
    mutex_create(flush_list_mutex_key, &buf_pool->flush_list_mutex,
             SYNC_BUF_FLUSH_LIST);
 
    for (i = BUF_FLUSH_LRU; i < BUF_FLUSH_N_TYPES; i++) {
        buf_pool->no_flush[i] = os_event_create(NULL);
    }
 
    /* 3. Initialize LRU fields
    --------------------------- */
 
    /* All fields are initialized by mem_zalloc(). */
 
    buf_pool_mutex_exit(buf_pool);
 
    return(DB_SUCCESS);
}