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<title>概述</title>
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<h1>概述</h1>
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<span><div>操作系统概述:</div><div><img src="概述_files/Image.png" type="image/png" data-filename="Image.png"/></div><div><span style="font-size: 12pt;">I/o接口与主存采用统一编址,其实是将主存的一部分划分出来作为I/o地址空间。</span></div><div><span style="font-size: 12pt; font-weight: bold;">访问指令</span><span style="font-size: 12pt;">:是指</span><span style="font-size: 12pt; color: rgb(227, 0, 0);">访问内存</span><span style="font-size: 12pt;">的指令 </span> <span style="font-size: 12pt; font-weight: bold;">控制指令</span><span style="font-size: 12pt;">:指</span><span style="font-size: 12pt; color: rgb(227, 0, 0);">程序控制</span><span style="font-size: 12pt;">类指令,用于控制程序流程改变的指令,包括条件转移指令、循环指令、程序调用和返回指令、中断指令等。</span></div><div><span style="font-size: 14pt;">处理机管理</span>:</div><div><img src="概述_files/Image [1].png" type="image/png" data-filename="Image.png"/></div><div><span style="font-size: 14pt;">PV操作:信号量用于表示系统中现有资源的数量,当信号量为负数时,代表这类资源已经分配完毕。等待进程数量为 分配资源的数量(对负数取反)</span></div><div><span style="font-size: 18.6667px;"><b>互斥信号量初始值 1</b></span></div><div><img src="概述_files/Image [2].png" type="image/png" data-filename="Image.png"/></div><div><br/></div><div><br/></div></span>
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