VOID CRWLock::Done()
{
ASSERT(m_nActive == 0);
ASSERT(m_dwWriterTID == 0);
CSEM* pSem = nullptr;
LONG lCount = 1;
{
CCriSecLock locallock(m_cs);
if(m_nWaitingWriters > 0)
{
--m_nActive;
--m_nWaitingWriters;
pSem = &m_smWrite;
}
else if(m_nWaitingReaders > 0)
{
m_nActive = m_nWaitingReaders;
lCount = m_nWaitingReaders;
pSem = &m_smRead;
m_nWaitingReaders = 0;
}
}
if(pSem != nullptr)
{
pSem->Release(lCount);
}
}
VOID CSWMR::Done()
{
CSEM* pSem = nullptr;
LONG lCount = 1;
{
CSpinLock locallock(m_cs);
if(m_nActive > 0)
--m_nActive;
else
++m_nActive;
if(m_nActive == 0)
{
if(m_nWaitingWriters > 0)
{
m_nActive = -1;
--m_nWaitingWriters;
pSem = &m_smWrite;
}
else if(m_nWaitingReaders > 0)
{
m_nActive = m_nWaitingReaders;
m_nWaitingReaders = 0;
pSem = &m_smRead;
lCount = m_nActive;
}
}
}
if(pSem != nullptr)
pSem->Release(lCount);
}
VOID CRWLock::WriteDone()
{
CSEM* pSem = nullptr;
LONG lCount = 0;
{
CSpinLock locallock(m_cs);
ASSERT(m_nActive < 0);
if(++m_nActive == 0)
{
DetachOwner();
Done(&pSem, lCount);
}
else
ASSERT(IsOwner());
}
if(pSem != nullptr)
pSem->Release(lCount);
}
VOID CRWLock::ReadDone()
{
CSEM* pSem = nullptr;
LONG lCount = 0;
{
CSpinLock locallock(m_cs);
ASSERT(m_nActive != 0);
if(m_nActive > 0)
{
if(--m_nActive == 0)
Done(&pSem, lCount);
}
else
ASSERT(IsOwner());
}
if(pSem != nullptr)
pSem->Release(lCount);
}