linux下boost的一个扩展线程池-threadpool-的学习

安装boost：

http://www.boost.org/下载boost，我下下来是boost_1_51_0.
boost库的大部分都可以直接引用头文件就行了，因为大多数都是头文件里模板加inline函数构成。但是也有些是需要安装成二进制lib的，比如thread.（详见文档："Getting Started..."）
$ cd boost_1_51_0
$ sudo ./bootstrap.sh //这条命令类似./configure. 也可以./bootstrap.sh --help看看有哪些命令参数.
$ sudo ./b2 install //这样，boost库的所有头文件和需要编译的lib都安装到/usr/local/lib 和 /usr/local/include了。（头文件在boost文件夹里.）

boost扩展工具-线程池(threadpool)：
http://threadpool.sourceforge.net/下载threadpool，然后把threadpool里面的boost目录下的threadpool.hpp和threadpool文件夹拷贝到/usr/local/include/boost/下(如果有权限问题还得cd /usr/local/include/boost && sudo chmod -R 777 *).
使用threadpool需要链接boost的两个共享库：boost_thread、boost_system（如果是静态链接那就还得动态链接pthread库）, 并且include <boost/threadpool.hpp>。(详见文档: "Installing & Using threadpool")
在使用threadpool时，编译会报错：
task_adaptors.hpp:149:28: error: ‘TIME_UTC’ was not declared in this scope。。。
这是因为boost::TIME_UTC has been renamed to boost::TIME_UTC_ in Boost 1.50。修改task_adaptors.hpp自不必说.
http://blog.csdn.net/byxdaz/article/details/6299020 <----这个不错。

---

代码：
callback_task.hpp:

/*
 * @file callback_task.hpp
 * @brief add callback task for threadpool.
 */

#ifndef __callback_task_h__
#define __callback_task_h__

#include <boost/function.hpp>

namespace boost { namespace threadpool
{
	
template<class RetType>
class callback_task
{
	typedef boost::function<void (RetType)> CALLBACK;
	typedef boost::function<RetType ()> FUNCTION;

private:
	CALLBACK m_Callback;
	FUNCTION m_Function;

public:
	callback_task(FUNCTION f, CALLBACK c):m_Callback(c), m_Function(f){}

	void operator()(){ m_Callback(m_Function()); }
};


}} // namespace boost::threadpoll

#endif // __callback_task_h__

 main.cpp:

#include <iostream>
#include <sstream>
#include <boost/threadpool.hpp>
#include "callback_task.hpp"

using namespace std;
using namespace boost::threadpool;


void task_normal()
{
    cout << "task_normal()\n";
}

void task_with_parameter(int value, string str)
{
    cout << "task_with_parameter(" << value << ", " << str << ")\n";
}

bool task_loop()
{
	static int i = 0;
	cout << "task_loop:" << i <<"\n";
	return ++i != 5;
}

int task_return14()
{ 
	sleep(1);
	return 14; 
}

void callback(int ret)
{
	cout<< "callback: task_return14() return " << ret << "\n";
}

void task_test4ThreadPrivateData()
{
	cout << "task_test4ThreadPrivateData().id:";

	static map<boost::thread::id, string> s_ThreadPrivateData;

	boost::thread::id tid = boost::this_thread::get_id();
	cout << tid << "\n";

	map<boost::thread::id, string>::iterator it;
	if((it = s_ThreadPrivateData.find(tid)) == s_ThreadPrivateData.end())
	{
		it = s_ThreadPrivateData.insert(make_pair(tid, "hello")).first;
	}

	cout << tid << " has private data:" << it->second << "\n";
}

void help2SeePoolStatus(pool & tp)
{
	ostringstream os;
	os << "begin>\n";

	os << "how many threads in the pool:" << tp.size() << "\n";
	os << "how many tasks are currently executed:" << tp.active() << "\n";
	os << "how many tasks are ready and waiting for execution:" << tp.pending() << "\n";

	os << "<end.";
	cout<< "\033[1;45;33m"<< os.str() << "\033[0m" << "\n";
}

void help2AddAllTask(pool & tp)
{
	tp.schedule( callback_task<int>(&task_return14, callback) );
    tp.schedule(&task_normal);
    tp.schedule(boost::bind(task_with_parameter, 4, "number"));
	tp.schedule( looped_task_func(&task_loop, 0.5*1000) );	
	tp.schedule(&task_test4ThreadPrivateData);
}

void testCase0()
{
	cout<< "testCase0()\n" << endl;
    
	// Create fifo thread pool container with n threads.
	pool tp(0);// 0 threads in pool
	
	help2AddAllTask(tp);

	help2SeePoolStatus(tp);
	
	//Wait until all task are finished.
	tp.wait();
}

void testCase1()
{
	cout<< "testCase1()\n" << endl;
	pool tp(1);// only one thread in pool.
	help2AddAllTask(tp);
	help2SeePoolStatus(tp);
	tp.size_controller().resize(5);
	help2SeePoolStatus(tp);
	tp.wait();
	help2SeePoolStatus(tp);
}

void testCase2()
{
	cout<< "testCase2()\n" << endl;
	pool tp(10);
	help2AddAllTask(tp);
	for(int i = 0; i != 4; i++, help2SeePoolStatus(tp), sleep(.5));
	tp.wait();
}

int main(int argc,char *argv[])
{
	testCase1();

    return(0);
}

 CMakeLists.txt:

cmake_minimum_required(VERSION 2.8)

project(test)

SET(CMAKE_C_COMPILER "g++")
SET(SRC_LIST main.cpp)

ADD_EXECUTABLE(${PROJECT_NAME} ${SRC_LIST})
TARGET_LINK_LIBRARIES(${PROJECT_NAME} boost_thread boost_system)