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Posted 30 Oct 2001


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An easy to use worker thread

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4.92/5 (6 votes)
30 Oct 20011 min read
Use worker threads in your application without the complicated details

Sample Image - WorkerThread.gif


I had the need for a worker thread which is easy to use and is independent of libraries like MFC. So I wrote a class called CWorkerThread which fits my needs. It provides functionality to execute an unlimited amount of functions in a single thread. The functions are processed syncronously in the order the events which are related to these functions are fired.

How it works

The CWorkerThread class has a method called AddEvent(HANDLE hEvent, EVENTPROC pProc, LPVOID pProcParam = NULL); This function takes a handle, a static or global function and an optional void pointer. The function pProc is executed when the event hEvent occurs. The pProcParam parameter is passed to that function. You can call AddEvent(...) for all events you want the thread to process. To start the thread call the objects Start(const int& nPriority = THREAD_PRIORITY_NORMAL); method. This will create the thread and initialize it's event queue. When you now set an event, the related function will be executed. To give you an impression of this event queue I pasted the code of the threads "main" thread procedure here:

UINT CWorkerThread::ThreadProc(LPVOID pProcParam)

    CWorkerThread* pThread = reinterpret_cast<CWorkerThread*>(pProcParam);
    DWORD dwResult = 0;

    int nSize = pThread->m_arrEvents.size();
    HANDLE* pArrEvents = new HANDLE[nSize];
    for (int i = 0; i < nSize; i++)
        pArrEvents[i] = pThread->m_arrEvents[i].hEvent;

    // Install the event queue...
    while (true)
        dwResult = ::WaitForMultipleObjects(nSize,
                                            INFINITE) - WAIT_OBJECT_0;

        if (dwResult == WORKERTHREADEVENT_KILL)
        // Execute appropriate function...

    delete[] pArrEvents;
    return 0;


The supplied sample application will show you how it works. If you need help with this or have suggestions on how to improve it or state bugs, feel free to drop me an email. Updated versions may be found at or


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Comments and Discussions

GeneralMaybe Demo....(not only one WorkerThread) Pin
player.20-Sep-06 2:49
Memberplayer.20-Sep-06 2:49 
GeneralGreat work, got my 5 points! Pin
Lars [Large] Werner25-Aug-06 8:46
professionalLars [Large] Werner25-Aug-06 8:46 
GeneralNice Pin
tyb26-Aug-05 16:11
Membertyb26-Aug-05 16:11 
Generaladding and removing events Pin
fioresoft18-Feb-04 16:24
Memberfioresoft18-Feb-04 16:24 
GeneralRemoving events from queue Pin
11-Feb-02 0:29
suss11-Feb-02 0:29 
QuestionNot starting again ? Pin
Yves21-Nov-01 19:04
MemberYves21-Nov-01 19:04 
Answerstarts perfectly... Pin
9-Feb-02 2:50
suss9-Feb-02 2:50 
GeneralRe: starts perfectly... Pin
Bhikshapathi Gorantla1-Apr-02 21:56
MemberBhikshapathi Gorantla1-Apr-02 21:56 
GeneralRe: starts perfectly... Pin
15-Apr-02 6:15
suss15-Apr-02 6:15 
GeneralMinor correction Pin
19-Nov-01 8:56
suss19-Nov-01 8:56 
GeneralQuestion Pin
Todd Smith31-Oct-01 12:57
MemberTodd Smith31-Oct-01 12:57 
GeneralRe: Question Pin
1-Nov-01 0:25
suss1-Nov-01 0:25 
GeneralSome improvement ideas Pin
Keith Bussell31-Oct-01 12:40
MemberKeith Bussell31-Oct-01 12:40 
GeneralRe: Some improvement ideas Pin
Todd Smith31-Oct-01 13:34
MemberTodd Smith31-Oct-01 13:34 
GeneralRe: Some improvement ideas Pin
Keith Bussell1-Nov-01 6:43
MemberKeith Bussell1-Nov-01 6:43 
GeneralRe: Some improvement ideas Pin
1-Nov-01 0:41
suss1-Nov-01 0:41 
GeneralRe: Some improvement ideas Pin
Keith Bussell1-Nov-01 8:56
MemberKeith Bussell1-Nov-01 8:56 

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