问题描述

如何在C++中使用boost创建线程池，以及如何将任务分配给线程池?

How do I create a thread pool using boost in C++, and how do I assign tasks to the threadpool?

推荐答案

过程非常简单.首先创建一个 asio::io_service 和一个 thread_group.用链接到 io_service 的线程填充 thread_group.使用 boost::bind功能.

The process is pretty simple. First create an asio::io_service and a thread_group. Fill the thread_group with threads linked to the io_service. Assign tasks to the threads using the boost::bind function.

要停止线程(通常在您退出程序时)只需停止 io_service 并加入所有线程.

To stop the threads (usually when you are exiting your program) just stop the io_service and join all threads.

您应该只需要这些标题:

You should only need these headers:

#include <boost/asio/io_service.hpp>
#include <boost/bind.hpp>
#include <boost/thread/thread.hpp>

这是一个例子:

/*
 * Create an asio::io_service and a thread_group (through pool in essence)
 */
boost::asio::io_service ioService;
boost::thread_group threadpool;


/*
 * This will start the ioService processing loop. All tasks 
 * assigned with ioService.post() will start executing. 
 */
boost::asio::io_service::work work(ioService);

/*
 * This will add 2 threads to the thread pool. (You could just put it in a for loop)
 */
threadpool.create_thread(
    boost::bind(&boost::asio::io_service::run, &ioService)
);
threadpool.create_thread(
    boost::bind(&boost::asio::io_service::run, &ioService)
);

/*
 * This will assign tasks to the thread pool. 
 * More about boost::bind: "http://www.boost.org/doc/libs/1_54_0/libs/bind/bind.html#with_functions"
 */
ioService.post(boost::bind(myTask, "Hello World!"));
ioService.post(boost::bind(clearCache, "./cache"));
ioService.post(boost::bind(getSocialUpdates, "twitter,gmail,facebook,tumblr,reddit"));

/*
 * This will stop the ioService processing loop. Any tasks
 * you add behind this point will not execute.
*/
ioService.stop();

/*
 * Will wait till all the threads in the thread pool are finished with 
 * their assigned tasks and 'join' them. Just assume the threads inside
 * the threadpool will be destroyed by this method.
 */
threadpool.join_all();

来源:Recipes <亚欧

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