static void Main(string[] args)
{
var t1 = Task.Factory.StartNew(state =>
{
//lock (_sync1)
using (var l1 = LeveledLock.Acquire(_sync1))
{
Console.WriteLine("L1: Level={0}", l1.Level);
Thread.Sleep(100);
//lock (_sync2)
using (var l2 = LeveledLock.Acquire(_sync2))
{
Console.WriteLine("L2: Level={0}", l2.Level);
Console.WriteLine("Done 1");
}
}
}, "T1");
//t1.Wait();
var t2 = Task.Factory.StartNew(state =>
{
//lock (_sync2)
using (var l2 = LeveledLock.Acquire(_sync2))
{
Console.WriteLine("L2: Level={0}", l2.Level);
Thread.Sleep(100);
//lock (_sync1)
using (var l1 = LeveledLock.Acquire(_sync1))
{
Console.WriteLine("L1: Level={0}", l1.Level);
Console.WriteLine("Done 1");
}
}
}, "T2");
// using continuation to write errors
t1.ContinueWith(t => Console.WriteLine("{0}: {1}", t.AsyncState, t.Exception.InnerExceptions[0].Message),
TaskContinuationOptions.OnlyOnFaulted);
t2.ContinueWith(t => Console.WriteLine("{0}: {1}", t.AsyncState, t.Exception.InnerExceptions[0].Message),
TaskContinuationOptions.OnlyOnFaulted);
// using continuation to write complete
t1.ContinueWith(t => Console.WriteLine("{0} Complete", t.AsyncState),
TaskContinuationOptions.NotOnFaulted);
t2.ContinueWith(t => Console.WriteLine("{0} Complete", t.AsyncState),
TaskContinuationOptions.NotOnFaulted);
Console.WriteLine("Done");
Console.ReadKey();
}
public static LeveledLock Acquire(object sync)
{
LeveledLock leveledLock;
lock (_localSync)
{
bool isAdded;
if (_locks.ContainsKey(sync))
{
leveledLock = _locks[sync];
leveledLock.RefCount += 1; // used for disposal
isAdded = false;
}
else
{
leveledLock = new LeveledLock(sync);
_locks.Add(sync, leveledLock); // set the lock leveling
isAdded = true;
}
if (leveledLock.Level > _currentGlobalLevel) // check for potential deadlock
{
throw new ThreadStateException("Potential deadlock");
}
if (isAdded) // if the
{
_currentGlobalLevel--;
leveledLock.Level = _currentGlobalLevel;
}
}
Monitor.Enter(sync);
return(leveledLock);
}
