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boost

线程池

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Boost线程池库是C++编程中用于管理并发任务执行的一种高效工具，它源自SourceForge项目。Boost库是一个广泛使用的C++库集合，为标准库提供了扩展，包括各种并发和多线程支持。线程池是一种优化的线程管理机制，通过预先创建一组线程，避免频繁地创建和销毁线程带来的开销。以下是对Boost线程池源代码文档的详细解析： 1. **线程池原理**： - 线程池的基本思想是维护一个工作线程的集合，当有新的任务提交时，线程池会从可用线程中选择一个执行任务，而不是每次都创建新线程。这样可以减少线程创建和销毁的时间开销，提高系统效率。 2. **Boost线程池实现**： - Boost线程池库提供了一个名为`boost::threadpool`的命名空间，其中包含`thread_pool`类，它是线程池的核心实现。 - `thread_pool`类包含了任务队列和工作线程的管理。用户可以通过向线程池提交任务（通常是一个函数或函数对象），线程池会自动调度这些任务。 3. **任务提交**： - 提交任务到线程池通常使用`submit`函数，它可以接受一个可调用对象（如函数指针、函数对象或Lambda表达式）和其参数。任务会被添加到任务队列中，等待空闲线程执行。 4. **线程管理**： - Boost线程池会根据需求动态调整工作线程的数量。当线程池为空，且任务队列中有待处理任务时，线程池会创建新的工作线程。当所有线程都在忙碌，新任务会被加入队列，等待被唤醒的线程执行。 - 当线程池中的所有任务都完成，线程会进入等待状态，直到有新任务提交。 5. **线程池的生命周期**： - 用户可以通过构造函数设置线程池的大小，也可以在运行时调整。线程池对象的销毁会等待所有任务执行完毕，确保线程安全关闭。 6. **线程池的异步特性**： - 线程池允许异步提交任务，这意味着提交任务的线程可以立即返回，而无需等待任务完成。这对于实现非阻塞的并发操作至关重要。 7. **线程池的定制**： - Boost线程池库提供了可扩展性，允许用户自定义线程池的行为，例如线程调度策略、任务调度器、错误处理等。 8. **线程池与Boost库的其他组件**： - Boost线程池可以与其他Boost库组件（如Boost.Asio、Boost.Signals2等）配合使用，以实现更复杂的并发和同步操作。 9. **文档资源**： - `threadpool-0_2_5-doc`可能包含详细的API文档、示例代码和使用指南，帮助开发者理解并有效地使用Boost线程池。通过深入学习和理解Boost线程池的源代码，开发者可以更好地利用多核处理器资源，优化并发程序的性能，同时保持代码的简洁性和可维护性。对于需要处理大量并发请求的服务或应用程序，Boost线程池是一个值得考虑的解决方案。

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boost 线程池源代码文档（108个子文件）

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<HTML> <HEAD> <TITLE>threadpool Documentation</TITLE> <LINK HREF="threadpool.css" REL="stylesheet" TYPE="text/css"> </HEAD> <BODY BGCOLOR="#FFFFFF"> <DIV CLASS="qindex"> <TABLE BORDER="0" WIDTH="100%"> <TR> <TD ALIGN="LEFT"> <B>threadpool</B> </TD> <TD ALIGN="RIGHT"> <A CLASS="qindex" HREF="../index.html">Overview</A> | <A CLASS="qindex" HREF="../reference/annotated.html">Reference</A> | <A CLASS="qindex" HREF="../tutorial/intro.html">Tutorial</A> | <A CLASS="qindex" HREF="../examples/intro.html">Examples</A> | <A CLASS="qindex" HREF="../design/intro.html">Design</A> </TD> </TR> </TABLE> </DIV> <DIV CLASS="qindex"> <TABLE BORDER="0" WIDTH="100%"> <TR> <TD ALIGN="LEFT"> <B>Reference</B> </TD> <TD ALIGN="RIGHT"> <A CLASS="qindex" HREF="annotated.html">Class List</A> | <A CLASS="qindex" HREF="functions.html">Member Functions</A> | <A CLASS="qindex" HREF="namespacemembers.html">Typedefs</A> | <A CLASS="qindex" HREF="files.html">File List</A> </TD> </TR> </TABLE> </DIV>  <div class="nav"> <a class="el" href="a00035.html">boost</a>::<a class="el" href="a00036.html">threadpool</a>::<a class="el" href="a00024.html">thread_pool</a></div> <h1>boost::threadpool::thread_pool< Task, SchedulingPolicy, SizePolicy, SizePolicyController, ShutdownPolicy > Class Template Reference</h1><a href="a00002.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2> <h3>template<typename Task = task_func, template< typename > class SchedulingPolicy = fifo_scheduler, template< typename > class SizePolicy = static_size, template< typename > class SizePolicyController = resize_controller, template< typename > class ShutdownPolicy = wait_for_all_tasks><br> class boost::threadpool::thread_pool< Task, SchedulingPolicy, SizePolicy, SizePolicyController, ShutdownPolicy ></h3> Thread pool. <p> Thread pools are a mechanism for asynchronous and parallel processing within the same process. The pool class provides a convenient way for dispatching asynchronous tasks as functions objects. The scheduling of these tasks can be easily controlled by using customized schedulers. A task must not throw an exception.<p> A pool is DefaultConstructible, CopyConstructible and Assignable. It has reference semantics; all copies of the same pool are equivalent and interchangeable. All operations on a pool except assignment are strongly thread safe or sequentially consistent; that is, the behavior of concurrent calls is as if the calls have been issued sequentially in an unspecified order.<p> <dl compact><dt><b>Parameters:</b></dt><dd> <table border="0" cellspacing="2" cellpadding="0"> <tr><td valign="top"></td><td valign="top"><em>Task</em> </td><td>A function object which implements the operator 'void operator() (void) const'. The operator () is called by the pool to execute the task. Exceptions are ignored. </td></tr> <tr><td valign="top"></td><td valign="top"><em>SchedulingPolicy</em> </td><td>A task container which determines how tasks are scheduled. It is guaranteed that this container is accessed only by one thread at a time. The scheduler shall not throw exceptions.</td></tr> </table> </dl> <dl compact><dt><b>Remarks:</b></dt><dd>The pool class is thread-safe.</dd></dl> <dl compact><dt><b>See also:</b></dt><dd>Tasks: <a class="el" href="a00036.html#c6f15485d0c9225572afc57b30f50358">task_func</a>, <a class="el" href="a00021.html">prio_task_func</a> <p> Scheduling policies: <a class="el" href="a00016.html">fifo_scheduler</a>, <a class="el" href="a00018.html">lifo_scheduler</a>, <a class="el" href="a00020.html">prio_scheduler</a> </dd></dl> <p> <p> Definition at line <a class="el" href="a00039.html#l00073">73</a> of file <a class="el" href="a00039.html">pool.hpp</a>.<table border="0" cellpadding="0" cellspacing="0"> <tr><td></td></tr> <tr><td colspan="2"><br><h2>Public Types</h2></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">typedef SchedulingPolicy<<br> <a class="el" href="a00024.html#321da9e252f14645cd3e433305576a4b">task_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#4bdb3cef94393456f2b7ec0d171d6b11">scheduler_type</a></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">typedef SizePolicyController<<br> pool_core_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#c7e01650ffec650c0279782eacb4be80">size_controller_type</a></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">typedef SizePolicy< pool_core_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#654dc8a75dc2ea813dc6307f8707658d">size_policy_type</a></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">typedef Task </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#321da9e252f14645cd3e433305576a4b">task_type</a></td></tr> <tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#ab990245fb601499bc768737f65b09b2">active</a> () const </td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#9d98ecc57fb790ad12e9c12dcead921b">clear</a> ()</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#4d8cacdeef78219399343a0bea999212">empty</a> () const </td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#1cea841e4310d6ff8a09f3f81124f45b">pending</a> () const </td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#3daf5e17f6c2ba9a0ecdeb73b41478e6">schedule</a> (<a class="el" href="a00024.html#321da9e252f14645cd3e433305576a4b">task_type</a> const &task)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#f0d21c4108b9808946ed8dabbbe2687f">size</a> () const </td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="a00024.html#c7e01650ffec650c0279782eacb4be80">size_controller_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#965f249200025312bd3a3a0f8144e3a5">size_controller</a> ()</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#6eba12acd49dfe14c7de44073a138aa1">thread_pool</a> (size_t initial_threads=0)</td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#f229154a61cb29bc3ce969974eca3175">wait</a> (xtime const &timestamp, size_t task_threshold=0) const </td></tr> <tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00024.html#dc8ccb7588160208ea0fd1d84b58269e">wait</a> (size_t task_threshold=0) const </td></tr> </table> <hr><h2>Member Typedef Documentation</h2> <a class="anchor" name="4bdb3cef94393456f2b7ec0d171d6b11"></a><!-- doxytag: member="boos

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