C++：创建线程初试

1.使用CreatThread创建

#include <iostream>#include <Windows.h>using namespace std;/*创建一个线程*/DWORD WINAPI fun(LPVOID ipParamter)  {    while (true)    {        cout << "fun1 display!" << endl; Sleep(1000);    }}/*创建第二个线程*/DWORD WINAPI fun2(LPVOID i){    while (true)    {        cout << "fun2 " << endl; Sleep(1500);    }}int main(){    //第二个参数0是初始的字节,第五个参数0是便是立即开始线程    HANDLE hThread = CreateThread(NULL, 0, fun, NULL, 0, NULL);    HANDLE hThread2 = CreateThread(NULL, 0, fun2, NULL, 0, NULL);    CloseHandle(hThread);    CloseHandle(hThread2);        while (true)    {        cout << "main display!" << endl; Sleep(2000);    }        return 0;}　

 

　　

使用CreatThread创建线程是不安全的，容易造成内存泄漏（CRT相关），所以推荐使用_beginThread或_beginThreadex，它内部也使用了CreatThread，但是在使用前做了很多工作以确保其安全性。

 

2.使用_beginThread创建

#include <iostream>#include <Windows.h>#include <process.h>using namespace std;void  fun1(){    while (true)    {        cout << "fun1 display\n"; Sleep(1000);    }}unsigned _stdcall fun2(void * ){    while (true)    {        cout << "fun2 display\n"; Sleep(1000);    }}int main(){    unsigned int thID1, thID2;    HANDLE hfun1, hfun2;    hfun1 = (HANDLE)_beginthread((void(*)(void*))fun1, 0, NULL);    hfun2 = (HANDLE)_beginthreadex(NULL, 0, fun2, NULL, 0, &thID2);    WaitForSingleObject(hfun1, INFINITE); //一定要等子线程完毕    WaitForSingleObject(hfun2, INFINITE);    CloseHandle(hfun1);    CloseHandle(hfun2);            cout << "end\n";    return 0;}

 

3.std::thread

C++11以来支持了thread类，方便了多线程的创建管理。

#include <mutex>#include <iostream>#include <thread>#include <windows.h>using namespace std;mutex m;void f(){    cout << "using..." << endl;}int a;void fun1(int i){        while (true)    {        m.lock();        //a++; cout << "f1"<< endl; Sleep(1000);        f();        Sleep(5000);        m.unlock();    }}void fun2(){        while (true)    {        m.lock();    //    a--; cout << "f2"<< endl; Sleep(1000);        f();        Sleep(1000);        m.unlock();    }}int main(){    a = 1;    thread th(fun1, 1);    thread ti(fun2);    th.join();    ti.join();        return 0;}

 

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