//-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- 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;
}
VOID
SimSensorCheckQueuedRequest (
_In_ WDFDEVICE Device,
_In_ ULONG Temperature,
_Inout_ PULONG LowerBound,
_Inout_ PULONG UpperBound,
_In_ WDFREQUEST Request
)
/*++
Routine Description:
Examines a request and performs one of the following actions:
* Retires the request if it is satisfied (the sensor temperature has
exceeded the bounds specified in the request)
* Retires the request if it is expired (the timer due time is in the past)
* Tightens the upper and lower bounds if the request remains in the queue.
Arguments:
Device - Supplies a handle to the device which owns this request.
Temperature - Supplies the current thermal zone temperature.
LowerBound - Supplies the lower bound threshold to adjust.
UpperBound - Supplies the upper bound threshold to adjust.
Request - Supplies a handle to the request.
--*/
{
ULONG BytesReturned;
LARGE_INTEGER CurrentTime;
PFDO_DATA DevExt;
size_t Length;
PREAD_REQUEST_CONTEXT Context;
WDFREQUEST RetrievedRequest;
PULONG RequestTemperature;
NTSTATUS Status;
DebugEnter();
PAGED_CODE();
KeQuerySystemTime(&CurrentTime);
DevExt = GetDeviceExtension(Device);
Context = WdfObjectGetTypedContext(Request, READ_REQUEST_CONTEXT);
RetrievedRequest = NULL;
//
// Complete the request if:
//
// 1. The temperature has exceeded one of the request thresholds.
// 2. The request timeout is in the past (but not negative).
//
if (SimSensorAreConstraintsSatisfied(Temperature,
Context->LowTemperature,
Context->HighTemperature,
Context->ExpirationTime)) {
Status = WdfIoQueueRetrieveFoundRequest(DevExt->PendingRequestQueue,
Request,
&RetrievedRequest);
if(!NT_SUCCESS(Status)) {
DebugPrint(SIMSENSOR_ERROR,
"WdfIoQueueRetrieveFoundRequest() Failed. 0x%x",
Status);
//
// Bail, likely because the request disappeared from the
// queue.
//
goto CheckQueuedRequestEnd;
}
Status = WdfRequestRetrieveOutputBuffer(RetrievedRequest,
sizeof(ULONG),
&RequestTemperature,
&Length);
if(NT_SUCCESS(Status) && (Length == sizeof(ULONG))) {
*RequestTemperature = Temperature;
BytesReturned = sizeof(ULONG);
} else {
//
// The request's return buffer is malformed.
//
BytesReturned = 0;
Status = STATUS_INVALID_PARAMETER;
DebugPrint(SIMSENSOR_ERROR,
"WdfRequestRetrieveOutputBuffer() Failed. 0x%x",
Status);
}
WdfRequestCompleteWithInformation(RetrievedRequest,
Status,
BytesReturned);
} else {
//
// The request will remain in the queue. Update the bounds accordingly.
//
if (*LowerBound < Context->LowTemperature) {
*LowerBound = Context->LowTemperature;
}
if (*UpperBound > Context->HighTemperature) {
*UpperBound = Context->HighTemperature;
}
}
CheckQueuedRequestEnd:
DebugExit();
return;
}
