线程互斥及基于线程锁的抢票程序

我们实现一个简单的多线程抢票程序。

#include<iostream>
#include<thread>
#include<unistd.h>
#include<functional>
#include<vector>
using namespace std;
template<class T>
using func_t=function<void(T)>;//返回值为void,参数为T
template<class T>
class Thread
{
    public:
    Thread(func_t<T> func,const string&name,T data)
    :_tid(0)
    ,_func(func)
    ,_threadname(name)
    ,isrunning(false)
    ,_data(data)
    {
    }
    static void*ThreadRoutine(void*args)
    {
        //(void)args;//仅仅是为了防止编译器有告警
        Thread*ts=static_cast<Thread*>(args);
        ts->_func(ts->_data);
        return nullptr;
    }
    bool Start()
    {
        int n=pthread_create(&_tid,nullptr,ThreadRoutine,this);
        if(n==0)
        {
        isrunning=true;
         return true;
        }
        return false;
    }
    bool Join()
    {
        if(!isrunning) return true;
        int n=pthread_join(_tid,nullptr);
        if(n==0)
        {
            isrunning=false;
            return true;
        }
        return false;

    }
    string GetThreadName()
    {
        return _threadname;
    }
    bool IsRunning()
    {
        return isrunning;
    }
    ~Thread()
    {}
    private:
    pthread_t _tid;
    string _threadname;
    bool isrunning;
    func_t<T> _func;
    T _data;
};

cpp 复制代码

#include"test.hpp"
using namespace std;
string GetThreadName()
{
    static int number=1;
    char name[64];
    snprintf(name,sizeof name,"Thread - %d",number++);
    return name;
}
void print(int num)
{
    while(num--)
    {
    cout<<"hello world"<<num<<endl;
    sleep(1);
    }
}
int ticket=100;
void GetTicket(string name)
{
    while(true)
    {
        if(ticket>0)
        {
            usleep(1000);
            printf("%s get a ticket %d\n",name.c_str(),ticket--);
        }
        else
        break;
    }

}
int main()
{
    int num=5;
    //vector<Thread<int>> Threads;
    string name1=GetThreadName();
    string name2=GetThreadName();
    string name3=GetThreadName();
    string name4=GetThreadName();

    Thread<string> t1(GetTicket,name1,name1);
    Thread<string> t2(GetTicket,name2,name2);
    Thread<string> t3(GetTicket,name3,name3);
    Thread<string> t4(GetTicket,name4,name4);

    t1.Start();
    t2.Start();
    t3.Start();
    t4.Start();

    t1.Join();
    t2.Join();
    t3.Join();
    t4.Join();

    // while(num--)
    // {
    //     Threads.push_back(Thread<int>(print,GetThreadName(),10));
    // }
    // for(auto &t:Threads)
    // {
    //     cout<<t.GetThreadName()<<" is running? "<<t.IsRunning()<<endl;
    // }
    // for(auto&t:Threads)
    // {
    //     t.Start();
    // }
    // for(auto &t:Threads)
    // {
    //     cout<<t.GetThreadName()<<" is running? "<<t.IsRunning()<<endl;
    // }
    // for(auto &t:Threads)
    // {
    //     t.Join();
    // }
    // Thread t(print,GetThreadName());
    // cout<<"Is thread running?"<<t.IsRunning()<<endl;
    // t.Start();
    // cout<<"Is thread running?"<<t.IsRunning()<<endl;
    // t.Join();
    return 0;
}