//-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- DtaEventsDequeue -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
//
DtStatus DtaEventsDequeue(
DtaDeviceData* pDvcData,
DtFileObject* pFile,
DtaEvents* pEvents) // If not NULL, we don't need the file object
{
WDF_REQUEST_PARAMETERS Params;
WDFREQUEST Request;
WDFREQUEST Request2;
NTSTATUS NtStatus = STATUS_SUCCESS;
size_t BufSize;
DtaIoctlOutputData* pOutBuf;
// Get all pending requests from queue for this file object
while (NtStatus == STATUS_SUCCESS)
{
WDF_REQUEST_PARAMETERS_INIT(&Params);
NtStatus = WdfIoQueueFindRequest(pDvcData->m_IalData.m_EventQueue, NULL,
DtFileGetHandle(pFile), &Params, &Request);
if (NtStatus != STATUS_SUCCESS) // Don't use the NT_SUCCESS macro here
break;
NtStatus = WdfIoQueueRetrieveFoundRequest(pDvcData->m_IalData.m_EventQueue,
Request, &Request2);
WdfObjectDereference(Request);
if (!NT_SUCCESS(NtStatus))
continue;
if (NT_SUCCESS(NtStatus))
{
NtStatus = WdfRequestRetrieveOutputBuffer(Request2,
Params.Parameters.DeviceIoControl.OutputBufferLength,
&pOutBuf, &BufSize);
}
if (NT_SUCCESS(NtStatus))
{ DtStatus Status;
BufSize = sizeof(DtaIoctlGetEventOutput);
Status = DtaEventsGet(pDvcData, pFile, pEvents,
&pOutBuf->m_GetEvent.m_EventType,
&pOutBuf->m_GetEvent.m_Value1,
&pOutBuf->m_GetEvent.m_Value2);
}
if (!NT_SUCCESS(NtStatus))
BufSize = 0;
// Complete request, use DtStatus in the driver-defined information field
WdfRequestCompleteWithInformation(Request2, NtStatus, (ULONG_PTR)BufSize);
}
return DT_STATUS_OK;
}
NTSTATUS
SimSensorScanPendingQueue (
_In_ WDFDEVICE Device
)
/*++
Routine Description:
This routine scans the device's pending queue for retirable requests.
N.B. This routine requires the QueueLock be held.
Arguments:
Device - Supplies a handle to the device.
--*/
{
WDFREQUEST CurrentRequest;
PFDO_DATA DevExt;
WDFREQUEST LastRequest;
ULONG LowerBound;
NTSTATUS Status;
ULONG Temperature;
ULONG UpperBound;
DebugEnter();
PAGED_CODE();
DevExt = GetDeviceExtension(Device);
Status = STATUS_SUCCESS;
LastRequest = NULL;
CurrentRequest = NULL;
Temperature = SimSensorReadVirtualTemperature(Device);
//
// Prime the walk by finding the first request present. If there are no
// requests, bail out immediately.
//
LowerBound = 0;
UpperBound = (ULONG)-1;
Status = WdfIoQueueFindRequest(DevExt->PendingRequestQueue,
NULL,
NULL,
NULL,
&CurrentRequest);
//
// Due to a technical limitation in SDV analysis engine, the following
// analysis assume has to be inserted to supress a false defect for
// the wdfioqueueretrievefoundrequest rule.
//
_Analysis_assume_(Status == STATUS_NOT_FOUND);
while (NT_SUCCESS(Status)) {
//
// Walk past the current request. By walking past the current request
// before checking it, the walk doesn't have to restart every time a
// request is satisfied and removed form the queue.
//
LastRequest = CurrentRequest;
Status = WdfIoQueueFindRequest(DevExt->PendingRequestQueue,
LastRequest,
NULL,
NULL,
&CurrentRequest);
//
// Process the last request.
//
SimSensorCheckQueuedRequest(Device,
Temperature,
&LowerBound,
&UpperBound,
LastRequest);
WdfObjectDereference(LastRequest);
if(Status == STATUS_NOT_FOUND) {
//
// LastRequest unexpectedly disappeared from the queue. Start over.
//
LowerBound = 0;
UpperBound = (ULONG)-1;
Status = WdfIoQueueFindRequest(DevExt->PendingRequestQueue,
NULL,
NULL,
NULL,
&CurrentRequest);
}
}
//
// Update the thresholds based on the latest contents of the queue.
//
SimSensorSetVirtualInterruptThresholds(Device, LowerBound, UpperBound);
DebugExitStatus(Status);
return Status;
}
