Rockwell Automation 1789-L10_L30_L60 SoftLogix 5800 System User Manual - Manual (Page 134)

134 Rockwell Automation Publication 1789-UM002J-EN-P - December 2012
Chapter 7 Develop External Routines
extern "C" __declspec(dllexport) void SayRungState(EXT_ROUTINE_CONTROL * pERCtrl)
{
pERCtrl->ctrlWord.EN = pERCtrl->ctrlWord.EnableIn;
rungState = INVALID_STATE;
// Only create the thread on prescan.
if (pERCtrl->ctrlWord.ScanType == 1)
{
hControllerState = CreateEvent(NULL, FALSE, TRUE, NULL);
if (hControllerState)
{
HANDLE hThread;
hThread = (HANDLE) _beginthread (RungStateThread,
0, // stack size
hControllerState); // arglist
if (hThread != INVALID_HANDLE_VALUE)
{
// The following code will set the thread's priority to the
// same priority as the task that invoked the external routine.
// If the thread is not performing time-critical work, then
// it is recommended that you set its priority to
// THREAD_PRIORITY_IDLE, i.e.
// SetThreadPriority (hThread, THREAD_PRIORITY_IDLE);
SetThreadPriority (hThread,
GetThreadPriority(GetCurrentThread()));
}
}
}
else
{
if (pERCtrl->ctrlWord.FirstScan)
{
rungState = FIRST_SCAN;
}
else if (pERCtrl->ctrlWord.EnableIn)
{
rungState = RUNG_TRUE;
}
else
{
rungState = RUNG_FALSE;
}
SetEvent(hControllerState);
}
return;
}