public void EnterWriteLock()
{
ServerSpinWait sw = new ServerSpinWait();
do
{
int state = rwlock;
if (state < RwWrite)
{
if (Interlocked.CompareExchange(ref rwlock, RwWrite, state) == state)
{
return;
}
state = rwlock;
}
// We register our interest in taking the Write lock (if upgradeable it's already done)
while ((state & RwWait) == 0 && Interlocked.CompareExchange(ref rwlock, state | RwWait, state) != state)
{
state = rwlock;
}
// Before falling to sleep
while (rwlock > RwWait)
{
sw.SpinOnce();
}
} while (true);
}
public static void SpinUntil(MyFunc <bool> condition)
{
ServerSpinWait sw = new ServerSpinWait();
while (!condition())
{
sw.SpinOnce();
}
}
public static bool SpinUntil(MyFunc<bool> condition, int millisecondsTimeout)
{
ServerSpinWait sw = new ServerSpinWait ();
ServerWatch watch = ServerWatch.StartNew ();
while (!condition ()) {
if (watch.ElapsedMilliseconds > millisecondsTimeout)
return false;
sw.SpinOnce ();
}
return true;
}
public void EnterReadLock()
{
ServerSpinWait sw = new ServerSpinWait();
do {
while ((rwlock & (RwWrite | RwWait)) > 0)
sw.SpinOnce();
if ((Interlocked.Add(ref rwlock, RwRead) & (RwWait | RwWait)) == 0)
return;
Interlocked.Add(ref rwlock, -RwRead);
} while (true);
}
public static bool SpinUntil(MyFunc <bool> condition, int millisecondsTimeout)
{
ServerSpinWait sw = new ServerSpinWait();
ServerWatch watch = ServerWatch.StartNew();
while (!condition())
{
if (watch.ElapsedMilliseconds > millisecondsTimeout)
{
return(false);
}
sw.SpinOnce();
}
return(true);
}
public void Enter(ref bool lockTaken)
{
if (lockTaken)
{
throw new ArgumentException("lockTaken", "lockTaken must be initialized to false");
}
if (isThreadOwnerTrackingEnabled && IsHeldByCurrentThread)
{
throw new LockRecursionException();
}
int slot = -1;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
slot = Interlocked.Increment(ref ticket.Users) - 1;
ServerSpinWait wait = new ServerSpinWait();
while (slot != ticket.Value)
{
wait.SpinOnce();
while (stallTickets != null && stallTickets.TryRemove(ticket.Value))
{
++ticket.Value;
}
}
}
finally
{
if (slot == ticket.Value)
{
lockTaken = true;
threadWhoTookLock = Thread.CurrentThread.ManagedThreadId;
}
else if (slot != -1)
{
// We have been interrupted, initialize stallTickets
if (stallTickets == null)
{
Interlocked.CompareExchange(ref stallTickets, new ServerConcurrentOrderedList <int>(), null);
}
stallTickets.TryAdd(slot);
}
}
}
public void EnterWriteLock()
{
ServerSpinWait sw = new ServerSpinWait();
do {
int state = rwlock;
if (state < RwWrite) {
if (Interlocked.CompareExchange(ref rwlock, RwWrite, state) == state)
return;
state = rwlock;
}
// We register our interest in taking the Write lock (if upgradeable it's already done)
while ((state & RwWait) == 0 && Interlocked.CompareExchange(ref rwlock, state | RwWait, state) != state)
state = rwlock;
// Before falling to sleep
while (rwlock > RwWait)
sw.SpinOnce();
} while (true);
}
public void EnterReadLock()
{
ServerSpinWait sw = new ServerSpinWait();
do
{
while ((rwlock & (RwWrite | RwWait)) > 0)
{
sw.SpinOnce();
}
if ((Interlocked.Add(ref rwlock, RwRead) & (RwWait | RwWait)) == 0)
{
return;
}
Interlocked.Add(ref rwlock, -RwRead);
} while (true);
}
public static void SpinUntil(MyFunc<bool> condition)
{
ServerSpinWait sw = new ServerSpinWait ();
while (!condition ())
sw.SpinOnce ();
}
public void Enter(ref bool lockTaken)
{
if (lockTaken)
throw new ArgumentException ("lockTaken", "lockTaken must be initialized to false");
if (isThreadOwnerTrackingEnabled && IsHeldByCurrentThread)
throw new LockRecursionException ();
int slot = -1;
RuntimeHelpers.PrepareConstrainedRegions ();
try {
slot = Interlocked.Increment (ref ticket.Users) - 1;
ServerSpinWait wait = new ServerSpinWait ();
while (slot != ticket.Value) {
wait.SpinOnce ();
while (stallTickets != null && stallTickets.TryRemove (ticket.Value))
++ticket.Value;
}
} finally {
if (slot == ticket.Value) {
lockTaken = true;
threadWhoTookLock = Thread.CurrentThread.ManagedThreadId;
} else if (slot != -1) {
// We have been interrupted, initialize stallTickets
if (stallTickets == null)
Interlocked.CompareExchange (ref stallTickets, new ServerConcurrentOrderedList<int> (), null);
stallTickets.TryAdd (slot);
}
}
}