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<a name="1204442"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">4.1 Partitions</font>
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<a name="1204443"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The basic job of memory management is to allow the application program to allocate and free blocks of memory from a larger block of memory, which is under the control of a memory allocator. In OS20 these concepts have been combined into a partition, which has three properties:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204447"> </a>the block of memory for which the partition is responsible,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204448"> </a>the current state of allocated and free memory,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1204449"> </a>the algorithm to use when allocating and freeing memory.</font></p>
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<a name="1204450"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The method of allocating/deallocating memory is the same whatever style of partition is used, only the algorithm used (and thus the interpretation of the partition data structures) changes.</font>
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<a name="1206935"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">There is nothing special about the memory which a partition manages. It can be a static or local array, or an absolute address which is known to be free. It can also be a block allocated from another partition (see the example given in <a href="libs.htm#1214476"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Chapter⌨️ 快捷键说明
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