private void WaitForWrite(WaitingToken wait)
{
int retry = 0;
while (true)
{
// Check if out token is the next and all readers has left
if (Interlocked.CompareExchange(ref this.sentinelToken.Next, wait, wait) == wait &&
Interlocked.CompareExchange(ref this.readerCount, 0, 0) == 0)
{
return;
}
LightweightSpinLock.SpinWait(ref retry);
}
}
public void Enter()
{
if (Interlocked.CompareExchange(ref this.held, 1, 0) == 0)
{
return;
}
int retry = 0;
while (true)
{
LightweightSpinLock.SpinWait(ref retry);
if ((this.held == 0) && (Interlocked.CompareExchange(ref this.held, 1, 0) == 0))
{
return;
}
}
}
public void EnterRead()
{
int retry = 0;
while (true)
{
if (Interlocked.CompareExchange(ref this.writerPending, 0, 0) == 0)
{
this.innerLock.Enter();
if (Interlocked.CompareExchange(ref this.writerPending, 0, 0) == 0)
{
Interlocked.Increment(ref this.readerCount);
}
this.innerLock.Exit();
break;
}
LightweightSpinLock.SpinWait(ref retry);
}
}