// NOTE: All locks must implement the WaitToWrite/DoneWriting methods
///<summary>Allows the calling thread to acquire the lock for writing or reading.</summary>
/// <param name="exclusive">true if the thread wishes to acquire the lock for exclusive access.</param>
public void Enter(Boolean exclusive)
{
#if DEADLOCK_DETECTION
if (exclusive)
{
if (AcquiringThreadMustRelease)
{
Thread.BeginCriticalRegion();
}
using (s_PerformDeadlockDetection ? DeadlockDetector.BlockForLock(this, true) : null) {
OnEnter(exclusive);
}
}
else
{
// When reading, there is no need to call BeginCriticalRegion since resource is not being modified
using (s_PerformDeadlockDetection ? DeadlockDetector.BlockForLock(this, IsMutualExclusive) : null) {
OnEnter(exclusive);
}
}
#else
OnEnter(exclusive);
#endif
Interlocked.Add(ref m_readWriteCounts, exclusive ? c_OneWriterCount : c_OneReaderCount);
}
///<summary>Allows the calling thread to release the lock.</summary>
public void Leave()
{
Contract.Assume(!CurrentlyFree());
Boolean exclusive = CurrentReaderCount() == 0;
#if DEADLOCK_DETECTION
if (s_PerformDeadlockDetection)
{
DeadlockDetector.ReleaseLock(this);
}
#endif
OnLeave(exclusive);
if (exclusive)
{
Interlocked.Add(ref m_readWriteCounts, -c_OneWriterCount);
//if (AcquiringThreadMustRelease) Thread.EndCriticalRegion();
}
else
{
Interlocked.Add(ref m_readWriteCounts, -c_OneReaderCount);
// When done reading, there is no need to call EndCriticalRegion since resource was not modified
}
}
