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<ol class="chapter"><li class="chapter-item expanded affix "><a href="index.html">简明 zCore 教程</a></li><li class="chapter-item expanded affix "><a href="zcore-intro.html">🚧 zCore 整体结构和设计模式</a></li><li class="chapter-item expanded affix "><a href="fuchsia.html">🚧 Fuchsia OS 和 Zircon 微内核</a></li><li class="chapter-item expanded "><a href="ch01-00-object.html"><strong aria-hidden="true">1.</strong> 内核对象</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="ch01-01-kernel-object.html"><strong aria-hidden="true">1.1.</strong> ✅ 初识内核对象</a></li><li class="chapter-item expanded "><a href="ch01-02-process-object.html"><strong aria-hidden="true">1.2.</strong> 🚧 对象管理器：Process 对象</a></li><li class="chapter-item expanded "><a href="ch01-03-channel-object.html"><strong aria-hidden="true">1.3.</strong> 🚧 对象传送器：Channel 对象</a></li></ol></li><li class="chapter-item expanded "><a href="ch02-00-task.html"><strong aria-hidden="true">2.</strong> 任务管理</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="ch02-01-zircon-task.html"><strong aria-hidden="true">2.1.</strong> 🚧 Zircon 任务管理体系</a></li><li class="chapter-item expanded "><a href="ch02-02-process-job-object.html" class="active"><strong aria-hidden="true">2.2.</strong> 🚧 进程管理：Process 与 Job 对象</a></li><li class="chapter-item expanded "><a href="ch02-03-thread-object.html"><strong aria-hidden="true">2.3.</strong> 🚧 线程管理：Thread 对象</a></li></ol></li><li class="chapter-item expanded "><a href="ch03-00-memory.html"><strong aria-hidden="true">3.</strong> 内存管理</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="ch03-01-zircon-memory.html"><strong aria-hidden="true">3.1.</strong> 🚧 Zircon 内存管理模型</a></li><li class="chapter-item expanded "><a href="ch03-02-vmo.html"><strong aria-hidden="true">3.2.</strong> 🚧 物理内存：VMO 对象</a></li><li class="chapter-item expanded "><a href="ch03-03-vmo-paged.html"><strong aria-hidden="true">3.3.</strong> 🚧 物理内存：按页分配的 VMO</a></li><li class="chapter-item expanded "><a href="ch03-04-vmar.html"><strong aria-hidden="true">3.4.</strong> 🚧 虚拟内存：VMAR 对象</a></li></ol></li><li class="chapter-item expanded "><a href="ch04-00-userspace.html"><strong aria-hidden="true">4.</strong> 用户程序</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="ch04-01-user-program.html"><strong aria-hidden="true">4.1.</strong> 🚧 Zircon 用户程序</a></li><li class="chapter-item expanded "><a href="ch04-02-context-switch.html"><strong aria-hidden="true">4.2.</strong> 🚧 上下文切换</a></li><li class="chapter-item expanded "><a href="ch04-03-syscall.html"><strong aria-hidden="true">4.3.</strong> 🚧 系统调用</a></li></ol></li><li class="chapter-item expanded "><a href="ch05-00-signal-and-waiting.html"><strong aria-hidden="true">5.</strong> 信号和等待</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="ch05-01-wait-signal.html"><strong aria-hidden="true">5.1.</strong> 🚧 等待内核对象的信号</a></li><li class="chapter-item expanded "><a href="ch05-02-port-object.html"><strong aria-hidden="true">5.2.</strong> 🚧 同时等待多个信号：Port 对象</a></li><li class="chapter-item expanded "><a href="ch05-03-more-signal-objects.html"><strong aria-hidden="true">5.3.</strong> 🚧 实现更多：EventPair, Timer 对象</a></li><li class="chapter-item expanded "><a href="ch05-04-futex-object.html"><strong aria-hidden="true">5.4.</strong> 🚧 用户态同步互斥：Futex 对象</a></li></ol></li><li class="chapter-item expanded "><a href="ch06-00-hal.html"><strong aria-hidden="true">6.</strong> 硬件抽象层</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="ch06-01-zcore-hal-unix.html"><strong aria-hidden="true">6.1.</strong> ✅ UNIX硬件抽象层</a></li></ol></li></ol> </div>
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<main>
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<h1 id="进程管理process-与-job-对象"><a class="header" href="#进程管理process-与-job-对象">进程管理：Process 与 Job 对象</a></h1>
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<blockquote>
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<p>介绍 Process 与 Job 的整体设计</p>
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<p>实现 Process 和 Job 对象的基本框架，支持树状结构</p>
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</blockquote>
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<h2 id="作业job"><a class="header" href="#作业job">作业Job</a></h2>
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<h3 id="概要"><a class="header" href="#概要">概要</a></h3>
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<p>作业是一组进程，可能还包括其他（子）作业。作业用于跟踪执行内核操作的特权（即使用各种选项进行各种syscall），以及跟踪和限制基本资源（例如内存，CPU）的消耗。每个进程都属于一个作业。作业也可以嵌套，并且除根作业外的每个作业都属于一个（父）作业。</p>
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<h3 id="描述"><a class="header" href="#描述">描述</a></h3>
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<p>作业是包含以下内容的对象：</p>
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<ul>
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<li>对父作业的引用</li>
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<li>一组子作业（每个子作业的父作业既是这个作业）</li>
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<li>一组成员进程</li>
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<li>一套策略（Policy）</li>
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</ul>
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<p>由多个进程组成的“应用程序”可作为单个实体，被作业基于一套策略进行控制。</p>
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<h3 id="作业策略job-policy"><a class="header" href="#作业策略job-policy">作业策略Job Policy</a></h3>
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<p><a href="https://fuchsia.dev/fuchsia-src/concepts/settings/policy/policy_concepts?hl=en">策略policy</a> 可在Kernel运行时动态修改系统的各种配置（setting）。作业策略主要涉及作业安全性和资源使用的条件（Condition）限制。</p>
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<h4 id="策略的行为policyaction"><a class="header" href="#策略的行为policyaction">策略的行为PolicyAction</a></h4>
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<p>策略的行为包括：</p>
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<ul>
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<li>Allow 允许条件</li>
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<li>Deny 拒绝条件</li>
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<li>AllowException 通过 debugt port 生成异常，异常处理完毕后可恢复执行且运行条件</li>
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<li>DenyException 通过 debugt port 生成异常，异常处理完毕后可恢复执行</li>
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<li>Kill 杀死进程</li>
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</ul>
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<h4 id="应用策略时的条件-policycondition"><a class="header" href="#应用策略时的条件-policycondition">应用策略时的条件 PolicyCondition</a></h4>
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<p>应用策略时的条件包括：</p>
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<ul>
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<li>BadHandle： 此作业下的某个进程正在尝试发出带有无效句柄的syscall。在这种情况下，<code>PolicyAction::Allow</code>并且<code>PolicyAction::Deny</code>是等效的：如果syscall返回，它将始终返回错误ZX_ERR_BAD_HANDLE。</li>
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<li>WrongObject：此作业下的某个进程正在尝试发出带有不支持该操作的句柄的syscall。</li>
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<li>VmarWx：此作业下的进程正在尝试映射具有写执行访问权限的地址区域。</li>
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<li>NewAny：代表上述所有ZX_NEW条件的特殊条件，例如NEW_VMO，NEW_CHANNEL，NEW_EVENT，NEW_EVENTPAIR，NEW_PORT，NEW_SOCKET，NEW_FIFO和任何将来的ZX_NEW策略。这将包括不需要父对象来创建的所有新内核对象。</li>
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<li>NewVMO：此作业下的某个进程正在尝试创建新的vm对象。</li>
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<li>NewChannel：此作业下的某个进程正在尝试创建新通道。</li>
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<li>NewEvent：此作业下的一个进程正在尝试创建一个新事件。</li>
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<li>NewEventPair：此作业下的某个进程正在尝试创建新的事件对。</li>
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<li>NewPort：此作业下的进程正在尝试创建新端口。</li>
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<li>NewSocket：此作业下的进程正在尝试创建新的套接字。</li>
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<li>NewFIFO：此工作下的一个进程正在尝试创建一个新的FIFO。</li>
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<li>NewTimer：此作业下的某个进程正在尝试创建新的计时器。</li>
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<li>NewProcess：此作业下的进程正在尝试创建新进程。</li>
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<li>NewProfile：此作业下的一个进程正在尝试创建新的配置文件。</li>
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<li>AmbientMarkVMOExec：此作业下的某个进程正在尝试使用带有ZX_HANDLE_INVALID的zx_vmo_replace_as_executable（）作为第二个参数，而不是有效的ZX_RSRC_KIND_VMEX。</li>
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</ul>
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<h2 id="进程process"><a class="header" href="#进程process">进程Process</a></h2>
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<p>进程是传统意义上程序的一个运行实例，包含一组指令和数据，这些指令将由一个或多个线程执行，并拥有一组资源。在具体实现上，进程包括如下内容：</p>
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<ul>
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<li>Handles ：大部分是进程用到的资源对象的句柄</li>
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<li>Virtual Memory Address Regions：进程所在的内存地址空间</li>
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<li>Threads：进程包含的线程组</li>
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</ul>
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<p>进程包含在作业（Job）的管理范畴之中。从资源和权限限制以及生命周期控制的角度来看，允许将由多个进程组成的应用程序视为一个实体（即作业）。</p>
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<h3 id="生命周期lifetime"><a class="header" href="#生命周期lifetime">生命周期(lifetime)</a></h3>
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<p>进程有自己的生命周期，从开始创建到直到被强制终止或程序退出为止。可通过调用<code>Process::create()</code>创建一个进程，并调用<code>Process::start()</code>开始执行 。该进程在以下情况下停止执行：</p>
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<ul>
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<li>最后一个线程终止或退出</li>
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<li>进程调用 <code>Process::exit()</code></li>
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<li>父作业（parent job）终止了该过程</li>
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<li>父作业（parent job）被销毁（destroied）</li>
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</ul>
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<p>注：<code>Process::start()</code>不能被调用两次。新线程不能被添加到已启动的进程。</p>
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