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assets/操作系统概念（原书第9版）_1693569619608_0.edn
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pages/OS-Operating System.md
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- 早期的计算机一次只能执行一个程序。这种程序完全控制系统，并且访问所有系统资源。然而，现代计算机系统允许加载多个程序到内存，以便于并发执行。这种改进要求：对各种程序提供更严谨的控制和更好的划分。这些需求导致了 [[OS-进程]] 的概念产生，即 [[$red]]==**进程为执行程序**==。进程是现代分时系统的工作单元 - 早期的计算机一次只能执行一个程序。这种程序完全控制系统，并且访问所有系统资源。然而，现代计算机系统允许加载多个程序到内存，以便于并发执行。这种改进要求：对各种程序提供更严谨的控制和更好的划分。这些需求导致了 [[OS-进程]] 的概念产生，即 [[$red]]==**进程为执行程序**==。进程是现代分时系统的工作单元
- 在讨论进程时，我们假设每个进程具有单个控制线程的一个执行程序。不过几乎所有的现代操作系统都允许一个进程包含多个线程。下面我们理解 [[OS-多线程]] 概念 - 在讨论进程时，我们假设每个进程具有单个控制线程的一个执行程序。不过几乎所有的现代操作系统都允许一个进程包含多个线程。下面我们理解 [[OS-多线程]] 概念
- CPU调度是多道程序操作系统的基础。通过在进程间切换CPU,操作系统可以使得计算机更加高效。下面我们在 [[OS-进程调度]] 中讨论CPU调度的基本概念和多个算法，也考虑为特定系统而选择算法的问题。在为进程模型中引入线程概念后，[[#green]]==对于支持线程的操作系统，**操作系统实际调度的是 内核级线程 而非 进程**==。不过，[[$green]]==**进程调度**和**线程调度**常常交替使用==。我们讨论一般的调度概念，所以采用进程调度；在针对线程特定概念是，采用线程调度 - CPU调度是多道程序操作系统的基础。通过在进程间切换CPU,操作系统可以使得计算机更加高效。下面我们在 [[OS-进程调度]] 中讨论CPU调度的基本概念和多个算法，也考虑为特定系统而选择算法的问题。在为进程模型中引入线程概念后，[[#green]]==对于支持线程的操作系统，**操作系统实际调度的是 内核级线程 而非 进程**==。不过，[[$green]]==**进程调度**和**线程调度**常常交替使用==。我们讨论一般的调度概念，所以采用进程调度；在针对线程特定概念是，采用线程调度
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pages/OS-进程调度.md
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pages/hls__操作系统概念（原书第9版）_1693569619608_0.md
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