windows 线程同步学习测试-1

环境win7旗舰64位系统，vs2013，AMD fx™4100 Auad-core processor ,8G内存，

看《windows核心编程》线程同步一章，看到有说g_x++会不同步的问题，试着写些代码加深印象。发现+1太快了，看不出效果，于是for循环了1亿次。代码如下：

#include "stdafx.h"

using std::cout; using std::endl; using std::cin;

unsigned __stdcall ThreadFunRun(void * paData)//vs默认是__cdecl 调用
{
int *iData = (int*)paData;
for (int index = 0; index < 100000000; ++index)
{
(*iData)++;
}
//cout <<"线程函数中"<< *iData << endl;
return 0;
}

using std::vector;

vector<HANDLE> createThread(int &ivalue)
{
vector<HANDLE> vecH;
const int iThrCount = 2;
for (int index = 0; index < iThrCount; ++index)
{
HANDLE hpt1 = (HANDLE)_beginthreadex(
NULL,//SECURITY_ATTRIBUTES
0,//cbStackSize
ThreadFunRun,
&ivalue,
0,
NULL
);
vecH.push_back(hpt1);
}

return vecH;
}

bool waitForRun(vector<HANDLE> & hs)
{
for (int index = 0; index < hs.size(); ++index)
{
DWORD dwaitRes = WaitForSingleObject(hs[index], INFINITE);
if (dwaitRes !=WAIT_FAILED)
{
CloseHandle(hs[index]);
}
else
{
cout << "等待时出错，出错ID：" << GetLastError() << endl;
for (; index < hs.size();++index)
{
CloseHandle(hs[index]);
}
return false;
}
}

return true;
}
int _tmain(int argc, _TCHAR* argv[])
{

const int icount = 50;
for (int index = 0; index < icount; ++index)
{
int ivCalc = 0;
vector<HANDLE>  hsGet = createThread(ivCalc);
//        Sleep(60);
//        cout << ivCalc << endl;
if (waitForRun(hsGet))
cout << ivCalc << endl;
else
cout<<"第 "<<index << " 次等待线程结束出错" << endl;
}
return 0;
}

运行效果部分复制如下：

103142316
103378991
114315655
113482883
112601936
103115533
104226349
116483624
118944471
117040062
117731078
104095516
113767825
108898288
114825927
102189580
98102943
114165950
113351409
114693549
103554014
103167647
113206459
103698422

结果甚至有小于1亿的。