GetProcessTimes - CodeProject®

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Sample Image - ProcessInfo.jpg

Introduction

This article is a brief explanation of how to use the GetProcessTimes API. There are times when knowing how long a process has been running might be useful.

The time values returned from GetProcessTimes are fairly easy to convert into something useful/readable. Let's operate on this code snippet:

HANDLE hProcess;
</CODE>FILETIME ftCreation,
         ftExit,
         ftKernel,
         ftUser;

GetProcessTimes(hProcess, &ftCreation, &ftExit, &ftKernel, &ftUser);

Calculating running-time

A processes' running-time is the amount of time that has elapsed between the current time and the processes' creation time. This is stored in a FILETIME structure.

Once the elapsed time is calculated, then it's a matter of converting it to hours, minutes, seconds, etc. Luckily, the COleDateTime class makes this a painless process.

COleDateTime timeNow = COleDateTime::GetCurrentTime(),
timeCreation = ftCreation;
COleDateTimeSpan timeDiff = timeNow - timeCreation;

From here, you can use the different methods of COleDateTimeSpan to get the elapsed hours, minutes, etc.

Calculating kernel and user times

Per the documentation, the kernel and user times are amounts of time rather than an actual time period. The value in the FILETIME structure is expressed in 100-nanosecond units. To convert that to something useful, let's look at two methods.

Method 1

We can convert that to seconds with some basic arithmetic. A nanosecond is one billionth of a second, but since the time is already expressed in 100-nanosecond units, we'll only divide by 10 million:

__int64 i64Kernel = *((__int64 *) &ftKernel);
DWORD dwKernel = (DWORD) (i64Kernel / 10000000U);

As an alternative to the casting used above, a union could have just as easily been employed:

union
{
FILETIME ftKernel;
__int64 i64Kernel;
} timeKernel;

timeKernel.ftKernel = ftKernel;
DWORD dwKernel = (DWORD) (timeKernel.i64Kernel / 10000000U);

Either way, dwKernel now represents the number of elapsed seconds that the process has been in kernel mode. Converting seconds to hours, minutes, and seconds is a straightforward process.

Method 2

An alternative method that does not require anything other than a function call is to use the FileTimeToSystemTime API. This stores the result in a SYSTEMTIME structure, where we then have access to the wHour, wMinute, and wSecond members.

SYSTEMTIME stKernel;
FileTimeToSystemTime(&ftKernel, &stKernel);

The user-mode time is handled in the same way as kernel-mode time.

Summary

That's all there is to it. Looking at all of this together yields:

GetProcessTimes(hProcess, &ftCreation, &ftExit, &ftKernel, &ftUser);

timeCreation = ftCreation;

strData.Format("Created at %02d:%02d:%02d", timeCreation.GetHour(), 
               timeCreation.GetMinute(), timeCreation.GetSecond());

timeDiff = timeNow - timeCreation;
strData.Format("Elapsed time = %ud %uh %um %us", timeDiff.GetDays(), 
               timeDiff.GetHours(), timeDiff.GetMinutes(), 
               timeDiff.GetSeconds());

FileTimeToSystemTime(&ftKernel, &stKernel);
strData.Format("Time in kernel mode = %uh %um %us", stKernel.wHour,
               stKernel.wMinute, stKernel.wSecond);

Notes

The way the demo code is currently written, some system-level processes did not allow their name and time-information to be retrieved.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

DavidCrow

Software Developer (Senior)
Pinnacle Business Systems

United States

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program compiles but no process's are shown

johnBgood123

15:39 27 Nov '07

compiled code using Microsoft Visual C++ 2005

program is in a loop at this point under wincore.cpp
{
ASSERT(::IsWindow(m_hWnd));

// don't translate non-input events
if ((lpMsg->message < WM_KEYFIRST || lpMsg->message > WM_KEYLAST) &&
(lpMsg->message < WM_MOUSEFIRST || lpMsg->message > AFX_WM_MOUSELAST))
return FALSE;

return IsDialogMessage(lpMsg);
}

int CWnd::RunModalLoop(DWORD dwFlags)
{
ASSERT(::IsWindow(m_hWnd)); // window must be created
ASSERT(!(m_nFlags & WF_MODALLOOP)); // window must not already be in modal state

// for tracking the idle time state
BOOL bIdle = TRUE;
LONG lIdleCount = 0;
BOOL bShowIdle = (dwFlags & MLF_SHOWONIDLE) && !(GetStyle() & WS_VISIBLE);
HWND hWndParent = ::GetParent(m_hWnd);
m_nFlags |= (WF_MODALLOOP|WF_CONTINUEMODAL);
MSG *pMsg = AfxGetCurrentMessage();

// acquire and dispatch messages until the modal state is done
for (;;)
{
ASSERT(ContinueModal());

// phase1: check to see if we can do idle work
while (bIdle &&
!::PeekMessage(pMsg, NULL, NULL, NULL, PM_NOREMOVE))
{
ASSERT(ContinueModal());

// show the dialog when the message queue goes idle
if (bShowIdle)
{
ShowWindow(SW_SHOWNORMAL);
UpdateWindow();
bShowIdle = FALSE;
}

// call OnIdle while in bIdle state
if (!(dwFlags & MLF_NOIDLEMSG) && hWndParent != NULL && lIdleCount == 0)
{
// send WM_ENTERIDLE to the parent
::SendMessage(hWndParent, WM_ENTERIDLE, MSGF_DIALOGBOX, (LPARAM)m_hWnd);
}
if ((dwFlags & MLF_NOKICKIDLE) ||
!SendMessage(WM_KICKIDLE, MSGF_DIALOGBOX, lIdleCount++))
{
// stop idle processing next time
bIdle = FALSE;
}
}

// phase2: pump messages while available
do
{
ASSERT(ContinueModal());

// pump message, but quit on WM_QUIT
if (!AfxPumpMessage())
{
AfxPostQuitMessage(0);
return -1;
}

// show the window when certain special messages rec'd
if (bShowIdle &&
(pMsg->message == 0x118 || pMsg->message == WM_SYSKEYDOWN))
{
ShowWindow(SW_SHOWNORMAL);
UpdateWindow();
bShowIdle = FALSE;
}

if (!ContinueModal())
goto ExitModal;

// reset "no idle" state after pumping "normal" message
if (AfxIsIdleMessage(pMsg))
{
bIdle = TRUE;
lIdleCount = 0;
}

} while (::PeekMessage(pMsg, NULL, NULL, NULL, PM_NOREMOVE));
}

ExitModal:
m_nFlags &= ~(WF_MODALLOOP|WF_CONTINUEMODAL);
return m_nModalResult;

john

Can I modify process create time, and HOW?

All is New

5:16 26 Jul '07

Can I modify process create time, and HOW?
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How to monitor processes on remote system?

Aryan S

20:10 2 May '07

I want to check memory usage by a process running in a remote system. Here is the code snippet I am using. I am specifying the system name/ IP, but call to PdhAddCounter()is failing. Any suggestion?

TCHAR szAvailBytes[256] = TEXT("");
TCHAR szWorkingSet[256] = TEXT("");
TCHAR szBuffer[256] = TEXT("");
DWORD dwBufferSize = sizeof(szAvailBytes);
HCOUNTER hAvailBytes,
hCacheBytes,
hWorkingSet;
HQUERY hQuery = NULL;
PDH_COUNTER_PATH_ELEMENTS pdhCpe;
PDH_STATUS pdhStatus;
PDH_FMT_COUNTERVALUE pdhfmtAvail,
pdhfmtWorking;

__try
{
pdhStatus = PdhOpenQuery(NULL, 0, &hQuery);
if (pdhStatus != ERROR_SUCCESS)
{
__leave;
}

//
// Make Counter Path
//
pdhCpe.szMachineName = TEXT();
pdhCpe.szObjectName = TEXT("Memory");
pdhCpe.szInstanceName = NULL;
pdhCpe.szParentInstance = NULL;
pdhCpe.dwInstanceIndex = -1;
pdhCpe.szCounterName = TEXT("Available Bytes");

pdhStatus = PdhMakeCounterPath(&pdhCpe, szAvailBytes, &dwBufferSize, 0);
if (pdhStatus != ERROR_SUCCESS)
{
__leave;
}

pdhCpe.szObjectName = TEXT("Process");
pdhCpe.szInstanceName = TEXT("explorer");
pdhCpe.szCounterName = TEXT("Working Set");
dwBufferSize = sizeof(szWorkingSet);
pdhStatus = PdhMakeCounterPath(&pdhCpe, szWorkingSet, &dwBufferSize, 0);
if (pdhStatus != ERROR_SUCCESS)
{
__leave;
}

//
// Add counters.
//

pdhStatus = PdhAddCounter(hQuery, szWorkingSet, 0, &hWorkingSet); // failing here :: Access denied
if (pdhStatus != ERROR_SUCCESS)
{
__leave;
}

//
// Get the data.
//
pdhStatus = PdhCollectQueryData(hQuery);
if (pdhStatus != ERROR_SUCCESS)
{
__leave;
}

pdhStatus = PdhGetFormattedCounterValue(hWorkingSet, PDH_FMT_LONG | PDH_FMT_NOSCALE, NULL, &pdhfmtWorking);
if (pdhStatus != ERROR_SUCCESS)
{
__leave;
}

wsprintf(szBuffer, TEXT("Working Set = %ld\n"), pdhfmtWorking.longValue);
OutputDebugString(szBuffer);

__finally
{
if (hQuery != NULL)
{
pdhStatus = PdhCloseQuery(hQuery);
if (pdhStatus != ERROR_SUCCESS)
{
}
}
}

Re: How to monitor processes on remote system?

DavidCrow

5:27 3 May '07

Are you using Windows XP or Vista?

Aryan S wrote:
pdhStatus = PdhAddCounter(hQuery, szWorkingSet, 0, &hWorkingSet); // failing here :: Access denied

Is this one of the PDH error status codes defined in PDHMsg.h?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

how to get memory usage of each process

Alok the programmer

4:12 14 Jul '04

Sir,with all due respect. I want to know, How much memory each processes are consuming as it shown by taskmgr in win2000 and Upward
Sign In·View Thread·Permalink	1.00/5 (1 vote)

Re: how to get memory usage of each process [modified]

DavidCrow

8:39 14 Jul '04

Like this:

void main( void )
{
    TCHAR                     szAvailBytes[256] = TEXT("");
    TCHAR                     szCacheBytes[256] = TEXT("");
    TCHAR                     szWorkingSet[256] = TEXT("");
    TCHAR                     szBuffer[256]     = TEXT("");
    DWORD                     dwBufferSize = sizeof(szAvailBytes);
    HCOUNTER                  hAvailBytes, 
                              hCacheBytes, 
                              hWorkingSet;
    HQUERY                    hQuery = NULL;
    PDH_COUNTER_PATH_ELEMENTS pdhCpe;
    PDH_STATUS                pdhStatus;
    PDH_FMT_COUNTERVALUE      pdhfmtAvail,
                              pdhfmtCache,
                              pdhfmtWorking;
 
    __try
    {
        pdhStatus = PdhOpenQuery(NULL, 0, &hQuery);
        if (pdhStatus != ERROR_SUCCESS)
        {
            __leave;
        }
 
        // 
        // Make Counter Path
        // 
        pdhCpe.szMachineName    = TEXT("your machine");
        pdhCpe.szObjectName     = TEXT("Memory");
        pdhCpe.szInstanceName   = NULL;
        pdhCpe.szParentInstance = NULL;
        pdhCpe.dwInstanceIndex  = -1;
        pdhCpe.szCounterName    = TEXT("Available Bytes");
 
        pdhStatus = PdhMakeCounterPath(&pdhCpe, szAvailBytes, &dwBufferSize, 0);
        if (pdhStatus != ERROR_SUCCESS)
        {
            __leave;
        } 
 
        pdhCpe.szCounterName = TEXT("Cache Bytes");
        dwBufferSize = sizeof(szCacheBytes);
        pdhStatus = PdhMakeCounterPath(&pdhCpe, szCacheBytes, &dwBufferSize, 0);
        if (pdhStatus != ERROR_SUCCESS)
        {
            __leave;
        } 
 
        pdhCpe.szObjectName   = TEXT("Process");
        pdhCpe.szInstanceName = TEXT("_Total");
        pdhCpe.szCounterName  = TEXT("Working Set");
        dwBufferSize = sizeof(szWorkingSet);
        pdhStatus = PdhMakeCounterPath(&pdhCpe, szWorkingSet, &dwBufferSize, 0);
        if (pdhStatus != ERROR_SUCCESS)
        {
            __leave;
        } 
 
        // 
        // Add counters.
        // 
        pdhStatus = PdhAddCounter(hQuery, szAvailBytes, 0, &hAvailBytes);
        if (pdhStatus != ERROR_SUCCESS)
        {
            __leave;
        } 
 
        pdhStatus = PdhAddCounter(hQuery, szCacheBytes, 0, &hCacheBytes);
        if (pdhStatus != ERROR_SUCCESS)
        {
            __leave;
        } 
        
        pdhStatus = PdhAddCounter(hQuery, szWorkingSet, 0, &hWorkingSet);
        if (pdhStatus != ERROR_SUCCESS)
        {
            __leave;
        } 
 
        // 
        // Get the data.
        // 
        pdhStatus = PdhCollectQueryData(hQuery);
        if (pdhStatus != ERROR_SUCCESS)
        {
            __leave;
        } 
 
        // 
        // Format counter values.
        // 
        pdhStatus = PdhGetFormattedCounterValue(hAvailBytes, PDH_FMT_LONG | PDH_FMT_NOSCALE, NULL, &pdhfmtAvail);
        if (pdhStatus != ERROR_SUCCESS)
        {
            __leave;
        } 
 
        pdhStatus = PdhGetFormattedCounterValue(hCacheBytes, PDH_FMT_LONG | PDH_FMT_NOSCALE, NULL, &pdhfmtCache);
        if (pdhStatus != ERROR_SUCCESS)
        {
            __leave;
        } 
 
        pdhStatus = PdhGetFormattedCounterValue(hWorkingSet, PDH_FMT_LONG | PDH_FMT_NOSCALE, NULL, &pdhfmtWorking);
        if (pdhStatus != ERROR_SUCCESS)
        {
            __leave;
        } 
 
        wsprintf(szBuffer, TEXT("Avail Bytes  = %ld\n"), pdhfmtAvail.longValue);
        OutputDebugString(szBuffer);
 
        wsprintf(szBuffer, TEXT("Cache Bytes  = %ld\n"), pdhfmtCache.longValue);
        OutputDebugString(szBuffer);
        
        wsprintf(szBuffer, TEXT("Working Set  = %ld\n"), pdhfmtWorking.longValue);
        OutputDebugString(szBuffer);
        
        wsprintf(szBuffer, TEXT("Physical Mem = %ldMB\n"), (pdhfmtAvail.longValue + pdhfmtCache.longValue + pdhfmtWorking.longValue) / (1024 * 1024));
        OutputDebugString(szBuffer);
    }
    __finally
    {
        if (hQuery != NULL)
        {
            pdhStatus = PdhCloseQuery(hQuery);
            if (pdhStatus != ERROR_SUCCESS)
            {
            }
        }
    }
}

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

-- modified at 8:41 Monday 11th September, 2006

Re: how to get memory usage of each process

Martial Spirit

7:22 6 Jul '05

Is it possible to obtain the dll module called by the specific process. sometime the memory allocation was done in the external dlls, so I want to know how about that. Best Regards
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Re: how to get memory usage of each process

De@r

5:25 3 Aug '09

Hi DavidCrow,

I can add the counter with instance and i am increasing the raw value of it but i can not see that value it is showing only 0. If i am incrementing the counter value without instance then it can be monitored but with instance i am unable to monitor it.
i creating the counter like it

CounterCreationDataCollection^ CCDC = gcnew CounterCreationDataCollection;

// Add the counter.
CounterCreationData^ averageCount64 = gcnew CounterCreationData;
averageCount64->CounterType = PerformanceCounterType::AverageCount64;
averageCount64->CounterName = "Counter2";
CCDC->Add( averageCount64 );

// Add the base counter.
CounterCreationData^ averageCount64Base = gcnew CounterCreationData;
averageCount64Base->CounterType = PerformanceCounterType::AverageBase;
averageCount64Base->CounterName = "Counter3";
CCDC->Add( averageCount64Base );

PerformanceCounterCategory::Create( "ZAverageInstanceCategory", "Demonstrates usage of the AverageCounter64 performance counter type.", CCDC );

PerformanceCounter^% PC = gcnew PerformanceCounter( "ZAverageInstanceCategory","Counter2","instance1", false );
PC->RawValue = 10;

PerformanceCounter^% BPC = gcnew PerformanceCounter( "ZAverageInstanceCategory","Counter3","instance2", false );
BPC->RawValue = 0;

Thanks
vijay

Missing file in project

pranay

2:51 5 May '04

Hi, i downloaded your code. it gives a compilin error sayin fatal error RC1015: cannot open include file 'res//ProcessInfo.rc2' i cant find that file in the dwnloaded files.. pls chk
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Re: Missing file in project

coderider

12:07 5 May '04

The file is in the zip. I suspect you have unzipped all of the files into a single folder. If this is the case, there are 2 solutions: 1) create a res folder underneath the folder you extracted to, and place ProcessInfo.rc2 and ProcessInfo.ico into it. 2) Extract the files again, and make sure that "Use Folder Names" is checked
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Re: Missing file in project

DavidCrow

5:35 6 May '04

coderider wrote: The file is in the zip. It is now, but wasn't when pranay posted. "The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)
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How to get CPU usage per process?

Airport1

0:58 22 Apr '04

How to get CPU usage per process? Shall be possible to calculate trough GetProcessTimes, but how?
Sign In·View Thread·Permalink	1.00/5 (2 votes)

Re: How to get CPU usage per process?

DavidCrow

4:39 22 Apr '04

Airport1 wrote:
How to get CPU usage per process?

This article hints at it, but here's a working example:

    PDH_STATUS                pdhStatus;
    HQUERY                    hQuery = NULL;
    HCOUNTER                  hProcessorTime; 
    PDH_COUNTER_PATH_ELEMENTS pdhCpe;
    PDH_FMT_COUNTERVALUE      pdhfmtProcessorTime;
    TCHAR                     szProcessorTime[256],
                              szBuffer[256];
    DWORD                     dwBufferSize;   
     
    __try
    {
        pdhStatus = PdhOpenQuery(NULL, 0, &hQuery);
        if (pdhStatus != ERROR_SUCCESS)
            __leave;
 
        // make counter path
        pdhCpe.szMachineName    = TEXT("crow-nt");
        pdhCpe.szObjectName     = TEXT("Process");
        pdhCpe.szInstanceName   = TEXT("Idle");
        pdhCpe.szParentInstance = NULL;
        pdhCpe.dwInstanceIndex  = -1;
        pdhCpe.szCounterName    = TEXT("% Processor Time");
 
        dwBufferSize = sizeof(szProcessorTime);
 
        pdhStatus = PdhMakeCounterPath(&pdhCpe, szProcessorTime, &dwBufferSize, 0);
        if (pdhStatus != ERROR_SUCCESS)
            __leave;
 
        // add counter
        pdhStatus = PdhAddCounter(hQuery, szProcessorTime, 0, &hProcessorTime);
        if (pdhStatus != ERROR_SUCCESS)
            __leave;
 
        // get the data
        pdhStatus = PdhCollectQueryData(hQuery);
        if (pdhStatus != ERROR_SUCCESS)
            __leave;
 
        // format counter value
        pdhStatus = PdhGetFormattedCounterValue(hProcessorTime, PDH_FMT_LONG, NULL, &pdhfmtProcessorTime);
        if (pdhStatus != ERROR_SUCCESS)
            __leave;
 
        if (ERROR_SUCCESS == pdhStatus)
            wsprintf(szBuffer, TEXT("Processor Time = %ld\n"), pdhfmtProcessorTime.longValue);
    }
    __finally
    {
        if (hQuery != NULL)
            pdhStatus = PdhCloseQuery(hQuery);
    }

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: How to get CPU usage per process? [modified]

termal

3:24 20 Jul '07

Hello,
thanks for this sample, i need little help to use this Frown | :(

,
i must to read the current cpu usage!
My program crash with Access violation after:

 // get the data
 pdhStatus = PdhCollectQueryData(hQuery);
 if (pdhStatus != ERROR_SUCCESS)
   __leave; // in my case program execution stops every time here!

I recive an PDH_NO_DATA, what to do now?

// in header of:
#define PDH_NO_DATA                      ((DWORD)0x800007D5L)
 
//
// MessageId: PDH_CALC_NEGATIVE_DENOMINATOR
//
// MessageText:
//
//  A counter with a negative denominator value was detected.
//

i make something wrong, but idont know what! Frown | :(

By compilig there are no errors, nothing, looks ok!

thanks for help!
termal

-- modified at 9:03 Friday 20th July, 2007

Re: How to get CPU usage per process?

DavidCrow

3:30 20 Jul '07

termal wrote: My program crash with Access violation after: pdhStatus = PdhCollectQueryData(hQuery); Is `hQuery` valid? "A good athlete is the result of a good and worthy opponent." - David Crow "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Re: How to get CPU usage per process?

termal

4:21 20 Jul '07

Hello,
yes ist valid, it's not NULL, if that is what you mean?!
I put your sample code in a own function with name int GetProcInf();

int GetProcInf()
{
// all variables
// here from 
__try{
        pdhStatus = PdhOpenQuery(NULL, 0, &hQuery); // hQuery is not NULL
        if (pdhStatus != ERROR_SUCCESS)
            __leave;
 
        // make counter path
        pdhCpe.szMachineName    = TEXT("crow-nt");
        pdhCpe.szObjectName     = TEXT("Process");
        pdhCpe.szInstanceName   = TEXT("Idle");
        pdhCpe.szParentInstance = NULL;
        pdhCpe.dwInstanceIndex  = -1;
        pdhCpe.szCounterName    = TEXT("% Processor Time");
 
        dwBufferSize = sizeof(szProcessorTime);
 
        pdhStatus = PdhMakeCounterPath(&pdhCpe, szProcessorTime, &dwBufferSize, 0);
        if (pdhStatus != ERROR_SUCCESS) // this is ok
            __leave;
 
        // add counter
        pdhStatus = PdhAddCounter(hQuery, szProcessorTime, 0, &hProcessorTime); // on this line i see in a output window there is an exception, but program stops in next call for data
	if (pdhStatus != ERROR_SUCCESS) //
            __leave;
 
        // get the data
        pdhStatus = PdhCollectQueryData(hQuery);
        if (pdhStatus != ERROR_SUCCESS) // here not, unhandled exception!  
            __leave;
......
// follow rest of code

}

This is what i try to read current cpu usage

Many thanks for help!
termal

Re: How to get CPU usage per process?

DavidCrow

4:24 20 Jul '07

termal wrote: pdhCpe.szMachineName = TEXT("crow-nt"); "A good athlete is the result of a good and worthy opponent." - David Crow "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Re: How to get CPU usage per process?

termal

4:30 20 Jul '07

ups here to set own machine name!?
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Re: How to get CPU usage per process?

DavidCrow

4:35 20 Jul '07

termal wrote: here to set own machine name!? Of course. That's why the member variable is called `szMachineName`. "A good athlete is the result of a good and worthy opponent." - David Crow "To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Re: How to get CPU usage per process?

deee123

5:59 13 Oct '04

Airport1 wrote: How to get CPU usage per process? Shall be possible to calculate trough GetProcessTimes, but how?
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Re: How to get CPU usage per process?

DavidCrow

6:08 13 Oct '04

Why are you quoting Airport1? "When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen
Sign In·View Thread·Permalink	2.00/5 (3 votes)

How to get cpu cycles

amarzee

1:10 17 Sep '03

By using above example we are getting kernel,user,creation times of process. How to get number of cpu cycles a particular process has executed from these information.
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Re: How to get cpu cycles

DavidCrow

4:39 22 Apr '04

See my response to Airport1. "The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)
Sign In·View Thread·Permalink	2.00/5 (1 vote)

Idle Apps

m.bergman

6:29 1 Aug '03

I noticed that GetProcessTimes returns the same user time and kernel time if the application is idle; that is, if I have an application which has been idle for eight hours, the user time at the end of that eight hours is the same as the beginning of the eight hours. Same goes for the kernel time. How can I differentiate an idle application from a frozen application? thanks.
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Re: Idle Apps

DavidCrow

6:50 1 Aug '03

m.bergman wrote:
I noticed that GetProcessTimes returns the same user time and kernel time if the application is idle; that is, if I have an application which has been idle for eight hours, the user time at the end of that eight hours is the same as the beginning of the eight hours. Same goes for the kernel time.

As it should. Just because a process is idle does not mean it is doing absolutely nothing (e.g., waiting around for user input is doing something). It is still in either the user or kernel mode.

m.bergman wrote:
How can I differentiate an idle application from a frozen application?

See if this article helps. It does nothing with frozen, however. I did see the "How can I detect if an application is frozen" question some time back. Maybe you can Google for it. I seem to recall it mentioning something about sending the suspect application a message and noting the result, if any. Try SendMessageTimeout(..., WM_NULL, ..., SMTO_ABORTIFHUNG, 4000, ...), which waits 4 seconds for the window to respond.