可变分区管理方式下采用 现主存分配和回收

　　

可变分区方式是按作业需要的主存空间大小来分割分区的。当要装入一个作业时，根据作业需要的主存容量查看是否有足够的空闲空间，

若有，则按需分配，否则，作业无法装入。假定内存大小为128K，空闲区说明表格式为：

·起始地址——指出空闲区的起始地址；

·长度——一个连续空闲区的长度；

·状态——有两种状态，一种是“未分配”状态；另一种是“空表目”状态，表示该表项目前没有使用。

采用首次适应算法分配回收内存空间。运行时，输入一系列分配请求和回收请求。

要求能接受来自键盘的空间申请及释放请求，能显示分区分配及回收后的内存布局情况。-The variable partition management mode variable current main memory allocation and recovery partition is the size of main memory space required by the operating partition to partition. See if there is enough free space to be loaded into a job, according to the main memory capacity of the job requires, and if so, according to need, otherwise, the operation could not be loaded. Assumes that the memory size of 128K, the idle zone table format: starting address- pointed out that the the idle starting address　length- a continuous free zone length　state- two states, one is " unallocated"　 another empty entry status, use the table before the project no. Using the first-fit algorithm assigned reclaim memory space. Run, enter a series of requests for allocation request and recycling. Requirements to accept space application and release request from the keyboard, you can partition allocation and recovered memory layout.