内存池的处理

pool->sector->blocks

pool is organized as sectors , and new sectors ared added when there is more blocks needed.

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mem_block_creat_pool(zg, blk_size , no_of_block,no_of_sectors)

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no_of_blocks :no_of_blocks per sector
no_of_sectors:max nomber _of_sectors per pool, if 0, the pool will creat as many of sectors as the system could afford .

return : pointer to a pool management instance
mem_block_creat_pool(zg, blk_size , no_of_blocks, no_of_sectors)
{
	adjusted_blk_size = (blk_size + 7) & ~(7);//内存对齐
	total_size = no_of_blocks * adjusted_blk_size;
	if (no_of_blocks >= UINT_MAX/2 || no_of_blocks * no_of_sectors >= UINT_MAX/2 )
		return ERROR;
		
	pool = malloc (sizeof (mem_blk_pool_t));
	memset(pool,0,sizeof (mem_blk_pool_t));
	
	pool->zg = zg;
	pool->blk_size = blk_size;
	pool->adjusted_blk_size = adjusted_blk_size
	pool->toal_size = toal_size;
	pool->no_of_blks= no_of_blocks;
	pool->no_of_scts= no_of_scts;

	pool->sectors= vertor_innit(no_of_sectors);
	
	//创建AVL树，每一个节点先从freelist 申请，再从系统内存中申请
	pal_avl_creat_mem_blk(&pool->sectors_tree,0,cpmare_func)

}