该程序允许用户发出3个不同的命令,

>任务[名称]
>信息
>退出

目的是任务将在新线程上启动一些工作,但在执行工作时返回到命令提示符.用户可以使用info命令找出哪些任务已完成,哪些未完成.

我使用双核Win7机器和Visual Studio 2008 Express.

问题1>

发出命令,任务p1 p2 p3,启动3个任务正在运行.这可以通过发布信息来检查.几秒钟后,工作完成,但由于某种原因,完成的标志并不总是在1或2个任务上设置为true.

问题2>

退出程序然后生成以下消息：

Windows has triggered a breakpoint in example.exe. This may be due to a corruption of the heap,which indicates a bug in example.exe or any of the DLLs it has loaded.
This may also be due to the user pressing F12 while example.exe has focus.
The output window may have more diagnostic information.

希望您可以重现此行为并提供帮助.

提前致谢.
亚历克斯.

//WARNING: THIS CODE DOES NOT BEHAVE EXACTLY AS INTENDED
#include <iostream>  
#include <string>
#include <sstream>
#include <boost/thread.hpp>  

using namespace std;

class task {
public:
    string mname;
    bool completed;
    void start()
    {
        int a = 0;
        for (int i=0 ; i<10000; i++)
        {
            for (int j=0 ; j<100000; j++)
            {
                a= i*2;
            }
        }
        this->completed = true;
    }
    task(string name)
    {
        mname = name;
        completed = false; 
    }
};

class taskManager{
    public:
        boost::thread_group threads;
        void startTask( string name )
        {
            //add new task to vector list           
            mtasks.push_back( task(name) );
            // execute start() on a new thread
            threads.create_thread( boost::bind( &task::start,&mtasks.back()) );
        }
        int tasksTotal()
        {
            return mtasks.size();
        }
        string taskInfo(int i)
        {
            string compstr("Not Completed");
            if ( mtasks[i].completed == true )
            {
                compstr = "Completed";
            }
            return mtasks[i].mname + " " + compstr; 
        }
    private:
        vector<task> mtasks; 
};

int main(int argc,char* argv[])  
{
    string cmd,temp;
    stringstream os;
    bool quit = false;
    taskManager mm;

    cout << "PROMPT>";

    while (quit == false)
    {
        //Wait for a valid command from user
        getline(cin,cmd);

        // Reset stringstream and assign new cmd string
        os.clear(); 
        os << "";
        os << cmd;
        //parse input string
        while (os >> temp) 
        {               
            if ( temp.compare("task") == 0 )
            {
                while (os >> temp) { mm.startTask( temp ); }                     
            }
            if ( temp.compare("info") == 0 )
            { 
                // Returns a list of all completed and not completed tasks
                for (int i = 0; i<mm.tasksTotal(); i++)
                {
                    cout << mm.taskInfo(i).c_str() << endl;
                }                           
            }
            if ( temp.compare("quit") == 0 ){ quit = true; }
        }

        cout << "PROMPT>";
    }

    mm.threads.join_all();      

    return 0;  
};