[thread]how to suspend a work thread

[viasant]

I want to suspend a work thread, so i tried to call wait(ms). But it never worked.
When I called wait() in the MsgThread derived from QThread, it entered into Line02/03, then returned from wait(). When I called wait(ms) in some function of a class derived from QDialog, then it reached Line 10, and then just jumped to Line22 after ms; however, the working thread did not been suspended. So wait() did not suspend the desired thread, it worked to the GUI thread!

So what can I do to get the work thread to be suspended?
thanks a lot!
By the way, the program has only one workthread

Q_D(QThread);
QMutexLocker locker(&d->mutex);
 
if (d->id == GetCurrentThreadId()) {
    qWarning("QThread::wait: Thread tried to wait on itself");
    return false;
}
if (d->finished || !d->running)
    return true;
 
++d->waiters;
locker.mutex()->unlock();
 
bool ret = false;
switch (WaitForSingleObject(d->handle, time)) {
case WAIT_OBJECT_0:
    ret = true;
    break;
case WAIT_FAILED:
    qErrnoWarning("QThread::wait: Thread wait failure");
    break;
case WAIT_ABANDONED:
case WAIT_TIMEOUT:
default:
    break;
}
 
locker.mutex()->lock();
--d->waiters;

Q_D(QThread);
QMutexLocker locker(&d->mutex);

if (d->id == GetCurrentThreadId()) {
    qWarning("QThread::wait: Thread tried to wait on itself");
    return false;
}
if (d->finished || !d->running)
    return true;

++d->waiters;
locker.mutex()->unlock();

bool ret = false;
switch (WaitForSingleObject(d->handle, time)) {
case WAIT_OBJECT_0:
    ret = true;
    break;
case WAIT_FAILED:
    qErrnoWarning("QThread::wait: Thread wait failure");
    break;
case WAIT_ABANDONED:
case WAIT_TIMEOUT:
default:
    break;
}

locker.mutex()->lock();
--d->waiters;

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