/// <summary>
/// Enter a critical section.
/// </summary>
/// <param name="obj">The object to use.</param>
/// <returns>The disposable section holding the lock.</returns>
public static IDisposable Enter(object obj)
{
bool isLockTaken = false;
try
{
Monitor.Enter(obj, ref isLockTaken);
// If we got this far shoud always be true.
Debug.Assert(isLockTaken, "Lock is taken.");
#if DEBUG
lock (RgLocks)
{
if (HeldLocks == null)
{
HeldLocks = new Stack <LockInfo>();
}
LockInfo lockInfo = FindLock(obj);
LockInfo potentionDeadlock = null;
foreach (LockInfo currentLock in HeldLocks)
{
// Recursive lock ok.
if (currentLock == lockInfo)
{
potentionDeadlock = null;
continue;
}
if (currentLock.IsDependent(lockInfo))
{
potentionDeadlock = currentLock;
}
}
Debug.Assert(potentionDeadlock == null, "Potention Deadlock");
bool isRec = lockInfo.OwningThread != -1;
Debug.Assert(lockInfo.OwningThread == -1 || lockInfo.OwningThread == Thread.CurrentThread.ManagedThreadId, "Lock owned or managed thread does not own lock.");
lockInfo.OwningThread = Thread.CurrentThread.ManagedThreadId;
if (HeldLocks.Count != 0 && potentionDeadlock == null && !isRec)
{
lockInfo.AddDependent(HeldLocks.Peek());
}
HeldLocks.Push(lockInfo);
return(new ExitOnDispose(obj, lockInfo, isRec));
}
#else
return(new ExitOnDispose(obj));
#endif
}
catch
{
// If for some resons we messed up, release lock.
if (isLockTaken)
{
Monitor.Exit(obj);
}
throw;
}
}
