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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"><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" class="active"><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="线程管理thread-对象"><a class="header" href="#线程管理thread-对象">线程管理：Thread 对象</a></h1>
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<p>线程对象是代表分时CPU的执行上下文的一种结构。线程对象与特定的进程对象相关联，该进程对象为线程对象执行中涉及的I/O和计算提供提供必要的内存和其他对象的句柄。</p>
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<h2 id="生命期"><a class="header" href="#生命期">生命期</a></h2>
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<p>线程是通过调用Thread::create()创建的，但只有在调用Thread::create()或Process::start()时才开始执行。这两个系统调用的参数都是要执行的初始例程的入口。</p>
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<p>传递给Process::start()的线程应该是在一个进程上开始执行的第一个线程。</p>
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<p>下列情况都可导致一个线程终止执行：</p>
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<ul>
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<li>通过调用 <code>CurrentThread::exit()</code></li>
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<li>当父进程终止时</li>
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<li>通过调用 <code>Task::kill()</code></li>
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<li>在生成没有处理程序或处理程序决定终止线程的异常之后。</li>
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</ul>
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<p>从入口例程返回并不终止执行。入口点的最后一个动作应该是调用CurrentThread::exit()。</p>
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<p>关闭一个线程的最后一个句柄并不终止执行。为了强行杀死一个没有可用句柄的线程，可以使用KernelObject::get_child()来获得该线程的句柄。但这种方法是非常不可取的。杀死一个正在执行的线程可能会使进程处于损坏的状态。</p>
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<p>本地线程总是分离的（<em>detached</em>）。也就是说，不需要join()操作来做一个干净的终止（clean termination）。但一些内核之上的运行系统，如C11或POSIX可能需要线程被连接（be joined）。</p>
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<h2 id="信号"><a class="header" href="#信号">信号</a></h2>
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<p>线程提供以下信号：</p>
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<ul>
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<li>THREAD_TERMINATED</li>
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<li>THREAD_SUSPENDED</li>
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<li>THREAD_RUNNING</li>
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</ul>
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<p>当一个线程启动执行时，THREAD_RUNNING被设定。当它被暂停时，THREAD_RUNNING被取消，THREAD_SUSPENDED被设定。当线程恢复时，THREAD_SUSPENDED被取消，THREAD_RUNNING被设定。当线程终止时，THREAD_RUNNING和THREAD_SUSPENDED都被置位，THREAD_TERMINATED也被置位。</p>
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<p>注意，信号经过“或”运算后进入KernelObject::wait_signal()函数系列所保持的状态 ，因此当它们返回时，你可能会看到所要求的信号的任何组合。</p>
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<h2 id="线程状态threadstate"><a class="header" href="#线程状态threadstate">线程状态(ThreadState)</a></h2>
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<blockquote>
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<p>状态转移：创建 -> 运行 -> 暂停 -> 退出，最好有个状态机的图</p>
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<p>实现 ThreadState，最好能加一个单元测试来验证转移过程</p>
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</blockquote>
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<pre><pre class="playground"><code class="language-rust edition2018">
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<span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span>pub enum ThreadState {
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New, \\该线程已经创建，但还没有开始运行
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Running, \\该线程正在正常运行用户代码
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Suspended, \\由于zx_task_suspend()而暂停
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Blocked, \\在一个系统调用中或处理一个异常而阻塞
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Dying, \\线程正在被终止的过程中，但还没有停止运行
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Dead, \\该线程已停止运行
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BlockedException, \\该线程在一个异常中被阻塞
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BlockedSleeping, \\该线程在zx_nanosleep()中被阻塞
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BlockedFutex, \\该线程在zx_futex_wait()中被阻塞
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BlockedPort, \\该线程在zx_port_wait()中被被阻塞
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BlockedChannel, \\该线程在zx_channel_call()中被阻塞
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BlockedWaitOne, \\该线程在zx_object_wait_one()中被阻塞
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|
BlockedWaitMany, \\该线程在zx_object_wait_many()中被阻塞
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|
BlockedInterrupt, \\该线程在zx_interrupt_wait()中被阻塞
|
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|
BlockedPager, \\被Pager阻塞 （目前没用到???）
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|
}
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<span class="boring">}
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</span></code></pre></pre>
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<h2 id="线程寄存器上下文"><a class="header" href="#线程寄存器上下文">线程寄存器上下文</a></h2>
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<blockquote>
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<p>定义 ThreadState，实现 read_state，write_state</p>
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</blockquote>
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<h2 id="async-运行时和-hal-硬件抽象层"><a class="header" href="#async-运行时和-hal-硬件抽象层">Async 运行时和 HAL 硬件抽象层</a></h2>
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<blockquote>
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|
<p>简单介绍 async-std 的异步机制</p>
|
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|
<p>介绍 HAL 的实现方法：弱链接</p>
|
|
|
<p>实现 hal_thread_spawn</p>
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</blockquote>
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<h2 id="线程启动"><a class="header" href="#线程启动">线程启动</a></h2>
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<blockquote>
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<p>将 HAL 接入 Thread::start，编写单元测试验证能启动多线程</p>
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</blockquote>
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