《读书笔记系列》==> 《C++并发实战 》

http://blog.csdn.net/column/details/ccia.html

via liuxuejiang158blog

C++并发实战：面试题2：一道迅雷笔试题
涉及c++11中的thread mutex

    #include<iostream>  
    #include<thread>  
    #include<mutex>  
    #include<condition_variable>  
    using namespace std;  
    mutex m;  
    condition_variable cond;  
    int LOOP=10;  
    int flag=0;  
      
    void fun(int id){  
        for(int i=0;i<LOOP;i++){  
            unique_lock<mutex> lk(m);  
            while(id!=flag)//一定要用循环判断，若是if多个阻塞线程唤醒后同时处于临界区  
                cond.wait(lk);  
            cout<<(u_char)('A'+id)<<" ";  
            flag=(flag+1)%3;  
            cond.notify_all();  
        }  
    }  
    int main(){  
        thread B(fun,1);  
        thread C(fun,2);  
        fun(0);  
        cout<<endl;  
        B.join();  
        C.join();  
        return 0;  
    }  

C++并发实战：面试题3：一道google笔试题
涉及c++11中的thread mutex condition_variable
iostream

    #include<iostream>  
    #include<thread>  
    #include<mutex>  
    #include<condition_variable>  
    #include<stdlib.h>  
    using namespace std;  
    #define LOOP 10  
    mutex m;  
    condition_variable cond;  
    int flag;  
    void fun(int num){  
        for(int i=0;i<LOOP;i++){  
            unique_lock<mutex> lk(m);  
            while(flag!=num)  
                cond.wait(lk);  
            cout<<num+1<<" ";  
            flag=(flag+1)%4;  
            cond.notify_all();  
        }  
    }  
    int main(int argc,char* argv[]){//argv[1]为0时写入A文件，2时写入B文件...  
        flag=atoi(argv[1]);  
        thread one(fun,1);  
        thread two(fun,2);  
        thread three(fun,3);  
        fun(0);  
        one.join();  
        two.join();  
        three.join();  
        cout<<endl;  
        return 0;  
    }

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