Work out how many seconds a thread ran for

Code:

---

#include "stdafx.h"
#include <Windows.h>

DWORD WINAPI test_thread(LPVOID Param)
{
    MessageBox(NULL,"test_thread started ","",0);

    for(int i = 0; i < 99999999999; i++)
    {

    }
    //i would like to work out how many seconds that loop ran for

    MessageBox(NULL,"test_thread over","",0);

    return 0;
}

int _tmain(int argc, _TCHAR* argv[])
{
    HANDLE test_thread_handle = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)test_thread,NULL,NULL,NULL);
    WaitForSingleObject(test_thread_handle,INFINITE);
    return 0;
}

---

You can save the time befor the loop and check it after:

Code:

---

//#include <time.h>

//involved variables
clock_t start_time, end_time;
double elapsed_time;

//check start time
start_time = clock();

//do the loop
for(...) {
    ...
}

//check end time
end_time = clock();

//and get the seconds
duration = ((double)(end_time - start_time)) / CLOCKS_PER_SEC;

---

Hope that helps
Niara

Or even easier: use the win32 GetTickCount instead time() functions to get the milliseconds before and after, then just deduct. On the MSDN/GetTickCount() theres some better explanation than mine, also covers high resolution timers, timer objects, etc

Niara