Buffer Cache - Memory allocated for storing data blocks read from physical data files.
缓冲区缓存——为存储从物理数据文件读取的数据块而分配的内存。
Pages are defined as fixed length data blocks and held in virtual memory.
页面定义为固定长度的数据块,并且保存在虚拟内存中。
On most systems, malloc and free are not reentrant, because they use a static data structure that records which memory blocks are free.
在大部分系统中,malloc和free都不是可重入的,因为它们使用静态数据结构来记录哪些内存块是空闲的。
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