int OffsetReplaceElem( GenLinkedOffsetList *pList, void *elemInList, void *newElem)
/* Replace an element in the list with a new element, in the same position. */
{
void *iElem, *lastElem;
if ( elemInList == NULL || newElem == NULL)
return 0;
for ( iElem = GetHeadPtr( pList), lastElem = NULL; iElem;
iElem = GetOffsetLink( pList, iElem))
{
if ( iElem == elemInList)
{
AssignOffsetLink( newElem, GetOffsetLink( pList, elemInList), pList->LinkOffset);
if ( lastElem) // somewhere past the head
{
AssignOffsetLink( lastElem, newElem, pList->LinkOffset);
}
else // at the head
{
pList->Head = (size_t) newElem - (size_t) pList;
}
if ( GetTailPtr( pList) == elemInList)
pList->Tail = (size_t) newElem - (size_t) pList;
return 1;
}
lastElem = iElem;
}
return 0;
}
int OffsetRemoveFromList( GenLinkedOffsetList *pList, void *elem)
/* Remove a linked list element from the list. Return 0 if it was not found. */
/* If the element is removed, its link will be set to NULL. */
{
void *iElem, *lastElem;
for ( iElem = GetHeadPtr( pList), lastElem = NULL; iElem;
iElem = GetOffsetLink( pList, iElem))
{
if ( iElem == elem) {
if ( lastElem) { // somewhere past the head
AssignOffsetLink( lastElem, GetOffsetLink( pList, elem), pList->LinkOffset);
} else { // at the head
iElem = GetOffsetLink( pList, elem);
pList->Head = iElem ? (size_t) iElem - (size_t) pList : 0;
}
if ( GetTailPtr( pList) == elem)
pList->Tail = lastElem ? (size_t) lastElem - (size_t) pList : 0;
AssignOffsetLink( elem, NULL, pList->LinkOffset); // maybe catch a stale reference bug.
return 1;
}
lastElem = iElem;
}
return 0;
}
DWORD CMclMailbox::GetAlertable( void *lpMsg, const CMclWaitableCollection & rCollection, DWORD dwTimeout) {
CMclWaitableCollection cCollection;
cCollection.AddObject(*m_cPendingCountSemaphoreAPtr);
cCollection.AddCollection(rCollection);
int nObjects = cCollection.GetCount();
DWORD dwStatus = cCollection.Wait( FALSE, dwTimeout);
if (CMclWaitSucceeded( dwStatus, nObjects)
&& (CMclWaitSucceededIndex(dwStatus) == 0)) {
dwStatus = m_cGuardMutexAPtr->Wait(dwTimeout);
if (CMclWaitSucceeded(dwStatus, 1) || CMclWaitAbandoned(dwStatus, 1)) {
CopyMemory( lpMsg, GetHeadPtr(), m_pHdr->cbMsgSize);
IncrementHead();
m_cGuardMutexAPtr->Release();
dwStatus = WAIT_OBJECT_0;
// Nov 7, 2001: only release semaphore if
// we've actually place something in the mailbox.
// Previously, the following line of code was outside
// this if block.
//
// Thanks to Johan Vanslembrouck for finding and
// reporting this bug.
//
m_cFreeCountSemaphoreAPtr->Release(1);
}
}
return dwStatus;
}
BOOL CMclMailbox::GetAlertable( void *lpMsg, CMclEvent *pInterrupt, DWORD dwTimeout) {
BOOL bStatus = FALSE;
DWORD dwStatus = pInterrupt->WaitForTwo( *m_cPendingCountSemaphoreAPtr, FALSE, dwTimeout);
if (CMclWaitSucceeded( dwStatus, 2)
&& (CMclWaitSucceededIndex(dwStatus) == 1)) {
dwStatus = m_cGuardMutexAPtr->Wait(dwTimeout);
if (CMclWaitSucceeded(dwStatus, 1) || CMclWaitAbandoned(dwStatus, 1)) {
CopyMemory( lpMsg, GetHeadPtr(), m_pHdr->cbMsgSize);
IncrementHead();
m_cGuardMutexAPtr->Release();
bStatus = TRUE;
// Nov 7, 2001: only release semaphore if
// we've actually place something in the mailbox.
// Previously, the following line of code was outside
// this if block.
//
// Thanks to Johan Vanslembrouck for finding and
// reporting this bug.
//
m_cFreeCountSemaphoreAPtr->Release(1);
}
}
return bStatus;
}
void OffsetAddToHead( GenLinkedOffsetList *pList, void *elem)
/* Add a linked list element to the head of the list. */
{
AssignOffsetLink( elem, GetHeadPtr( pList), pList->LinkOffset);
if ( pList->Tail == 0)
pList->Tail = (size_t) elem - (size_t) pList;
pList->Head = (size_t) elem - (size_t) pList;
}
BOOL CMclMailbox::Get( void *lpMsg, DWORD dwTimeout) {
DWORD dwStatus = m_cPendingCountSemaphoreAPtr->Wait(dwTimeout);
if (CMclWaitSucceeded(dwStatus, 1)) {
dwStatus = m_cGuardMutexAPtr->Wait(dwTimeout);
if (CMclWaitSucceeded(dwStatus, 1) || CMclWaitAbandoned(dwStatus, 1)) {
CopyMemory( lpMsg, GetHeadPtr(), m_pHdr->cbMsgSize);
IncrementHead();
m_cGuardMutexAPtr->Release();
// Nov 7, 2001: only release semaphore if
// we've actually place something in the mailbox.
// Previously, the following line of code was outside
// this if block.
//
// Thanks to Johan Vanslembrouck for finding and
// reporting this bug.
//
m_cFreeCountSemaphoreAPtr->Release(1);
}
}
return (CMclWaitSucceeded(dwStatus, 1));
}
