C++ USES usage instances of TLS thread local storage

  • 2020-04-02 02:47:49
  • OfStack

This article illustrates the use of TLS thread local storage in C++. Share with you for your reference.

Specific methods are as follows:

//Usetls.cpp: defines the entry point for the console application. & have spent < br / >
//  
 
#include "stdafx.h" 
#include <Windows.h> 
#include <process.h> 
 
//The statement & have spent < br / > VOID InitStartTime(); 
DWORD GetUserTime(); 
 
//TLS index, global variable & PI; & have spent < br / > DWORD  g_dwTlsIndex; 
 
VOID InitStartTime() 

    DWORD dwStartTime = GetTickCount(); 
    ::TlsSetValue(g_dwTlsIndex,(LPVOID)dwStartTime); 

 
DWORD GetUserTime() 

    DWORD dwNowTime = GetTickCount(); 
    DWORD dwStartTime = (DWORD)::TlsGetValue(g_dwTlsIndex); 
    return dwNowTime - dwStartTime; 

 
UINT WINAPI ThreadProc(LPVOID lpParameter) 

    //Simulating the working process of a thread & NBSP; < br / >     DWORD i = 1000 * 1000 *100; 
    while (i--) 
    { 
    } 
    printf("Thread ID:%-5d,Use Time:%dn",::GetCurrentThreadId(), GetUserTime()); 
    return 0; 

 
int _tmain(int argc, _TCHAR* argv[]) 

    HANDLE hThread[10]; 
    //Get the TLS index & NBSP; < br / >     g_dwTlsIndex = ::TlsAlloc(); 
    //Start ten threads and calculate the running time of each thread & NBSP; < br / >     for (int i=0;i<10;i++) 
    { 
        hThread[i] = (HANDLE)_beginthreadex(NULL, 0, ThreadProc, NULL, 0, NULL); 
    } 
    //Waiting for a worker thread & NBSP; < br / >     ::WaitForMultipleObjects(10, hThread, TRUE, INFINITE); 
     
    for (int i=0;i<10;i++) 
    { 
        //::WaitForSingleObject(hThread[i], INFINITE); 
        ::CloseHandle(hThread[i]); 
    } 
    //Release TLS  < br / >     ::TlsFree(g_dwTlsIndex); 
    return 0; 
}

Hope that the article described in the C++ programming to help you.


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