问题描述
如何创建在C ++使用boost线程池，以及我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
这个过程是pretty简单。首先创建一个ASIO :: io_service对象和thread_group。填补挂io_service对象线程thread_group。将任务分配给使用功能的线程。
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，当你退出程序）只是停止io_service对象，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.
您应该只需要这些头：
#include <boost/asio/io_service.hpp>
#include <boost/bind.hpp>
#include <boost/thread/thread.hpp>
下面是一个例子：
/*
* 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 treads 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：<一个href=\"http://think-async.com/Asio/Recipes?skin=clean.nat,asio,pattern#A_thread_pool_for_executing_arbi\">Recipes ＆LT; ASIO
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