03UseTls

#include<stdio.h>
#include<stdlib.h>
#include<windows.h>
#include<process.h>

int g_nTlsNum;
UINT __stdcall ThreadProc(LPVOID);
void InitialStartTime();
DWORD GetUsedTime();

UINT __stdcall ThreadProc(LPVOID lpParam)
{
    InitialStartTime();
    int i = 10000*10000;
    while(i--);
    printf("The Thread that its id is %d Runing time is %d
",::GetCurrentThreadId(),GetUsedTime());
    
    return 0;
}
void InitialStartTime()
{
    DWORD dwStartTime = ::GetTickCount();
    ::TlsSetValue(g_nTlsNum,&dwStartTime);
}
DWORD GetUsedTime()
{
    return ::GetTickCount() - *((DWORD *)::TlsGetValue(g_nTlsNum));
}
int main(int argc,char* argv[])
{
    HANDLE h[10];
    unsigned dwThreadId;
    g_nTlsNum = ::TlsAlloc();
    for(int i = 0;i<10;i++)
    {
        h[i] = (HANDLE)::_beginthreadex(NULL,0,ThreadProc,NULL,0,&dwThreadId);
    }
    ::WaitForMultipleObjects(10,h,true,INFINITE);
    for(int i = 0;i<10;i++)
    {
        ::CloseHandle(h[i]);
    }
    ::TlsFree(g_nTlsNum);
    
    system("pause");
    return 0;
}