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10:01:54">2025-06-02</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E6%8A%80%E6%9C%AF/">技术</a><i class="fas fa-angle-right article-meta-link"></i><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E6%8A%80%E6%9C%AF/%E6%93%8D%E4%BD%9C%E7%B3%BB%E7%BB%9F/">操作系统</a></span></div><div class="content">进程与线程进程与线程一个进程（Process）是计算机中正在运行的程序的实例，它由以下核心组成部分构成： PCB（Process Control Block，进程控制块） 进程ID（PID）、父进程ID（PPID） 进程状态（运行、就绪、阻塞等） 代码段（Text Segment） 数据段（Data Segment） 程序执行的实体。没有代码，进程无法运行；没有数据，代码无法处理信息。 PCB内主要有什么 进程标识信息：PID 进程状态信息：运行（Running）、就绪（Ready）、阻塞（Blocked）等 CPU上下文信息（状态）：（进程被切换时，保存当前CPU状态以便恢复）PC、SP 等 进程的状态转换 区分就绪态与阻塞态 主动/被动的转换 进程的创建 分配PID与PCB 操作系统为新进程分配唯一的进程ID（PID）和空的进程控制块（PCB）。 例子：在终端输入 ls 命令时，Shell（父进程）调用 fork() 创建子进程，内核为其分配PCB。 分配资源 ...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2025/05/25/%E7%BA%BF%E6%80%A7%E4%BB%A3%E6%95%B0/" title="线性代数"><img class="post-bg" src="/img/%E6%A3%AE%E6%9E%97-%E8%BD%A6%E7%AB%99.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="线性代数"></a></div><div class="recent-post-info"><a class="article-title" href="/2025/05/25/%E7%BA%BF%E6%80%A7%E4%BB%A3%E6%95%B0/" title="线性代数">线性代数</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2025-05-25T08:33:36.000Z" title="发表于 2025-05-25 16:33:36">2025-05-25</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E6%95%B0%E5%AD%A6/">数学</a></span></div><div class="content">向量齐次线性方程组的解 </div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/2025/05/20/%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BD%91%E7%BB%9C%EF%BC%88408%E8%80%83%E7%A0%94%EF%BC%89/" title="计算机网络（408考研）"><img class="post-bg" src="/img/%E4%BA%91-%E5%A4%A9%E7%A9%BA-%E5%B1%B1.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="计算机网络（408考研）"></a></div><div class="recent-post-info"><a class="article-title" href="/2025/05/20/%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BD%91%E7%BB%9C%EF%BC%88408%E8%80%83%E7%A0%94%EF%BC%89/" title="计算机网络（408考研）">计算机网络（408考研）</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2025-05-20T10:49:33.000Z" title="发表于 2025-05-20 18:49:33">2025-05-20</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E6%8A%80%E6%9C%AF/">技术</a><i class="fas fa-angle-right article-meta-link"></i><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E6%8A%80%E6%9C%AF/%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BD%91%E7%BB%9C/">计算机网络</a></span></div><div class="content">数据链路层数据链路层的流量控制与可靠传输机制GNB首先探究为什么GBN的最大窗口为：2^n - 1 此时我们的数据编号为00，01，10，11，一共四个编号（0，1，2，3），如果我们我们设置发送窗口的值为 2^n（即4），那么当我们设置发送方的发送序号为0~3的四个数据包的时候，此时会发生两种情况： 第一种情况：接受方正确接收了所有数据，然后返回接收到的最大序号，即3。（GBN返回此时接收到的序号的最大值） 第二种情况：接收方发送的确认没有正确回传，所以发送方需要重传4个数据包。 无论是发生了第一种情况还是第二种情况，我们的接受方再一次收到4个数据的时候，都无法判断这是新的4个数据，还是重发的四个数据，此时就会产生错误。 那么如果我们设置发送窗口的大小为 2^n -...</div></div></div><div class="recent-post-item"><div class="post_cover right"><a href="/2025/05/06/Android%E5%BC%80%E5%8F%91%E8%AF%BE%E7%A8%8B/" title="Android开发课程"><img class="post-bg" src="/img/%E4%B8%98%E9%99%B5-%E4%BA%91-%E5%9C%BA%E5%9C%B0.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Android开发课程"></a></div><div class="recent-post-info"><a class="article-title" href="/2025/05/06/Android%E5%BC%80%E5%8F%91%E8%AF%BE%E7%A8%8B/" title="Android开发课程">Android开发课程</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2025-05-06T02:35:00.000Z" title="发表于 2025-05-06 10:35:00">2025-05-06</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E6%8A%80%E6%9C%AF/">技术</a></span></div><div class="content">河南理工大学Android开发课程：共40学时（24理论学时、16实践学时），学分2.5。 Android四层结构 应用层(System Apps)系统内置的应用程序以及非系统级的应用程序都属于应用层，负责与用户进行交互，一般使用Java或者Kotlin开发，也就是我们所说的应用层开发。 应用框架层(Java API Framework)这一层为应用层开发提供所需要的Java API，也就是常说的Android系统的Java源码，这一层由Java代码编写，所以叫JavaFramework。 系统运行库层(Native)从图中可以看出这里分为了两个部分，分别是C/C++程序库和Android运行时库。 C/C++库这些C/C++库程序可以被应用框架层所使用，至于为什么Android系统要使用C/C++库，而不都用Java库，原因主要是C/C++代码执行效率更高，而且很多功能有成熟的C++代码，不用重新写 Android运行时库 分为核心库和ART。*（Android运行时环境（ART）自Android...</div></div></div><div class="recent-post-item"><div class="post_cover left"><a href="/2025/05/05/%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BB%84%E6%88%90%E5%8E%9F%E7%90%86%EF%BC%88408%E8%80%83%E7%A0%94%EF%BC%89/" title="计算机组成原理（408考研）"><img class="post-bg" src="/img/%E4%B8%98%E9%99%B5-%E4%BA%91-%E5%9C%BA%E5%9C%B0.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="计算机组成原理（408考研）"></a></div><div class="recent-post-info"><a class="article-title" href="/2025/05/05/%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BB%84%E6%88%90%E5%8E%9F%E7%90%86%EF%BC%88408%E8%80%83%E7%A0%94%EF%BC%89/" title="计算机组成原理（408考研）">计算机组成原理（408考研）</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2025-05-05T03:12:37.000Z" title="发表于 2025-05-05 11:12:37">2025-05-05</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/%E6%8A%80%E6%9C%AF/">技术</a><i class="fas fa-angle-right 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