//-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- DtuEventsGetEventsObject -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
//
static DtuEvents* DtuEventsGetEventsObject(
DtuDeviceData* pDvcData,
DtFileObject* pFile)
{
Int i;
DtuEvents* pDtuEvents = NULL;
for (i=0; i<MAX_NUM_FILE_HANDLES; i++)
{
DtSpinLockAcquire(&pDvcData->m_Events[i].m_Lock);
if (pDvcData->m_Events[i].m_RefCount > 0)
{
if (DtFileCompare(&pDvcData->m_Events[i].m_File, pFile))
{
pDtuEvents = &pDvcData->m_Events[i];
// Increment refcount
pDtuEvents->m_RefCount++;
}
}
DtSpinLockRelease(&pDvcData->m_Events[i].m_Lock);
if (pDtuEvents != NULL)
break;
}
return pDtuEvents;
}
//.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- DtaEncD7ProExclusiveAccess -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
//
DtStatus DtaEnDecExclusiveAccess(
DtaNonIpPort* pNonIpPort,
DtFileObject* pFile,
Int Cmd)
{
DtStatus Result = DT_STATUS_OK;
DtaEnDecPort* pEnDec = &pNonIpPort->m_EnDec;
DtSpinLockAcquire(&pEnDec->m_ExclAccessLock);
if (Cmd == DTA_EXCLUSIVE_ACCESS_CMD_ACQUIRE)
{
if (!pEnDec->m_ExclAccess)
{
pEnDec->m_ExclAccess = TRUE;
pEnDec->m_ExclAccessOwner = *pFile;
} else
Result = DT_STATUS_IN_USE;
} else if (Cmd == DTA_EXCLUSIVE_ACCESS_CMD_RELEASE)
{
if (pEnDec->m_ExclAccess)
{
if (DtFileCompare(&pEnDec->m_ExclAccessOwner, pFile))
{
pEnDec->m_ExclAccess = FALSE;
}
else
Result = DT_STATUS_IN_USE;
}
} else if (Cmd == DTA_EXCLUSIVE_ACCESS_CMD_PROBE)
{
if (pEnDec->m_ExclAccess)
Result = DT_STATUS_IN_USE;
} else if (Cmd == DTA_EXCLUSIVE_ACCESS_CMD_CHECK)
{
if (!pNonIpPort->m_ExclAccess)
Result = DT_STATUS_EXCL_ACCESS_REQD;
else if (!DtFileCompare(&pEnDec->m_ExclAccessOwner, pFile))
Result = DT_STATUS_IN_USE;
} else
Result = DT_STATUS_NOT_SUPPORTED;
DtSpinLockRelease(&pEnDec->m_ExclAccessLock);
return Result;
}
//-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- DtaEventsUnregister -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
//
void DtaEventsUnregister(DtaDeviceData* pDvcData, DtFileObject* pFile)
{
DtaEvents* pDtaEvents = NULL;
DtSpinLockAcquire(&pDvcData->m_EventsSpinlock);
pDtaEvents = pDvcData->m_pEvents;
while (pDtaEvents != NULL)
{
if (DtFileCompare(&pDtaEvents->m_File, pFile))
break;
pDtaEvents = pDtaEvents->m_pNext;
}
if (pDtaEvents == NULL)
{
DtSpinLockRelease(&pDvcData->m_EventsSpinlock);
return;
}
// Remove events struct from linked list while holding the spinlock
if (pDtaEvents->m_pPrev != NULL)
pDtaEvents->m_pPrev->m_pNext = pDtaEvents->m_pNext;
else
pDvcData->m_pEvents = pDtaEvents->m_pNext;
if (pDtaEvents->m_pNext != NULL)
pDtaEvents->m_pNext->m_pPrev = pDtaEvents->m_pPrev;
pDtaEvents->m_pPrev = NULL;
pDtaEvents->m_pNext = NULL;
DtSpinLockRelease(&pDvcData->m_EventsSpinlock);
// Even if two threads call DtaEventsUnregister at the same time we'll only come here
// once. We remove the DtaEvents object from the linked-list while holding the
// spinlock, so the second thread won't find the object and return immediately.
// Signal pending event (will remove object if event was pending)
DtaEventsGetCancel(pDvcData, pFile);
// Decrement refcount to free object as soon as it's no longer in use
DtaEventsUnrefEventsObject(pDvcData, pDtaEvents);
}
//.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- DtaEnDecClose -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
//
DtStatus DtaEnDecClose(DtaNonIpPort* pNonIpPort, DtFileObject* pFile)
{
DtaEnDecPort* pEnDec = &pNonIpPort->m_EnDec;
DtSpinLockAcquire(&pEnDec->m_ExclAccessLock);
if (!pEnDec->m_ExclAccess || !DtFileCompare(&pEnDec->m_ExclAccessOwner, pFile))
{
DtSpinLockRelease(&pEnDec->m_ExclAccessLock);
return DT_STATUS_OK;
}
if (pNonIpPort->m_pDvcData->m_DevInfo.m_TypeNumber == 2180 ||
pNonIpPort->m_pDvcData->m_DevInfo.m_TypeNumber == 2182)
DtaEncD7ProUncleanDetach(pNonIpPort);
pEnDec->m_ExclAccess = FALSE;
DtSpinLockRelease(&pEnDec->m_ExclAccessLock);
return DT_STATUS_OK;
}
//-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- DtaEventsGetEventsObject -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
//
static DtaEvents* DtaEventsGetEventsObject(
DtaDeviceData* pDvcData,
DtFileObject* pFile)
{
DtaEvents* pDtaEvents = NULL;
DtSpinLockAcquire(&pDvcData->m_EventsSpinlock);
pDtaEvents = pDvcData->m_pEvents;
while (pDtaEvents != NULL)
{
if (DtFileCompare(&pDtaEvents->m_File, pFile))
{
// Increment refcount
DtAtomicIncrement(&pDtaEvents->m_RefCount);
break;
}
pDtaEvents = pDtaEvents->m_pNext;
}
DtSpinLockRelease(&pDvcData->m_EventsSpinlock);
return pDtaEvents;
}