private static void ChurnConcurrent()
{
var dict = new NonBlocking.ConcurrentDictionary <int, string>();
//var dict = new Concurrent.ConcurrentDictionary<int, string>();
var threadCnt = 200;
List <Task> tasks = new List <Task>(threadCnt);
var sw = Stopwatch.StartNew();
for (int i = 0; i < threadCnt; i++)
{
var task = new Task(() =>
{
for (int j = i * 1000000, l = j + 1000000; j < l; j++)
{
string dummy;
dict.TryAdd(j, "dummy");
dict.TryRemove(j, out dummy);
//Thread.Sleep(10);
}
System.Console.Write('.');
}, TaskCreationOptions.LongRunning);
tasks.Add(task);
task.Start();
}
Task.WaitAll(tasks.ToArray());
System.Console.WriteLine(sw.ElapsedMilliseconds);
}
public static void TestExceptions()
{
var dictionary = new NonBlocking.ConcurrentDictionary <string, int>();
Assert.Throws <ArgumentNullException>(
() => dictionary.TryAdd(null, 0));
// "TestExceptions: FAILED. TryAdd didn't throw ANE when null key is passed");
Assert.Throws <ArgumentNullException>(
() => dictionary.ContainsKey(null));
// "TestExceptions: FAILED. Contains didn't throw ANE when null key is passed");
int item;
Assert.Throws <ArgumentNullException>(
() => dictionary.TryRemove(null, out item));
// "TestExceptions: FAILED. TryRemove didn't throw ANE when null key is passed");
Assert.Throws <ArgumentNullException>(
() => dictionary.TryGetValue(null, out item));
// "TestExceptions: FAILED. TryGetValue didn't throw ANE when null key is passed");
Assert.Throws <ArgumentNullException>(
() => { var x = dictionary[null]; });
// "TestExceptions: FAILED. this[] didn't throw ANE when null key is passed");
Assert.Throws <KeyNotFoundException>(
() => { var x = dictionary["1"]; });
// "TestExceptions: FAILED. this[] TryGetValue didn't throw KeyNotFoundException!");
Assert.Throws <ArgumentNullException>(
() => dictionary[null] = 1);
// "TestExceptions: FAILED. this[] didn't throw ANE when null key is passed");
Assert.Throws <ArgumentNullException>(
() => dictionary.GetOrAdd(null, (k) => 0));
// "TestExceptions: FAILED. GetOrAdd didn't throw ANE when null key is passed");
Assert.Throws <ArgumentNullException>(
() => dictionary.GetOrAdd("1", null));
// "TestExceptions: FAILED. GetOrAdd didn't throw ANE when null valueFactory is passed");
Assert.Throws <ArgumentNullException>(
() => dictionary.GetOrAdd(null, 0));
// "TestExceptions: FAILED. GetOrAdd didn't throw ANE when null key is passed");
Assert.Throws <ArgumentNullException>(
() => dictionary.AddOrUpdate(null, (k) => 0, (k, v) => 0));
// "TestExceptions: FAILED. AddOrUpdate didn't throw ANE when null key is passed");
Assert.Throws <ArgumentNullException>(
() => dictionary.AddOrUpdate("1", null, (k, v) => 0));
// "TestExceptions: FAILED. AddOrUpdate didn't throw ANE when null updateFactory is passed");
Assert.Throws <ArgumentNullException>(
() => dictionary.AddOrUpdate(null, (k) => 0, null));
// "TestExceptions: FAILED. AddOrUpdate didn't throw ANE when null addFactory is passed");
dictionary.TryAdd("1", 1);
Assert.Throws <ArgumentException>(
() => ((IDictionary <string, int>)dictionary).Add("1", 2));
// "TestExceptions: FAILED. IDictionary didn't throw AE when duplicate key is passed");
}
private static void TestRemove2(int removesPerThread)
{
NonBlocking.ConcurrentDictionary <int, int> dict = new NonBlocking.ConcurrentDictionary <int, int>();
for (int i = 0; i < removesPerThread; i++)
{
dict[i] = -i;
}
// The dictionary contains keys [0..N), each key mapped to a value equal to the key.
// Threads will cooperatively remove all even keys.
const int SIZE = 2;
int running = SIZE;
bool[][] seen = new bool[SIZE][];
for (int i = 0; i < SIZE; i++)
{
seen[i] = new bool[removesPerThread];
}
using (ManualResetEvent mre = new ManualResetEvent(false))
{
for (int t = 0; t < SIZE; t++)
{
int thread = t;
Task.Run(
() =>
{
for (int key = 0; key < removesPerThread; key++)
{
int value;
if (dict.TryRemove(key, out value))
{
seen[thread][key] = true;
Assert.Equal(-key, value);
}
}
if (Interlocked.Decrement(ref running) == 0)
{
mre.Set();
}
});
}
mre.WaitOne();
}
Assert.Equal(0, dict.Count);
for (int i = 0; i < removesPerThread; i++)
{
Assert.False(seen[0][i] == seen[1][i],
String.Format("> FAILED. Two threads appear to have removed the same element. TestRemove2(removesPerThread={0})", removesPerThread)
);
}
}
public static void TestClear()
{
var dictionary = new NonBlocking.ConcurrentDictionary <int, int>();
for (int i = 0; i < 10; i++)
{
dictionary.TryAdd(i, i);
}
Assert.Equal(10, dictionary.Count);
dictionary.Clear();
Assert.Equal(0, dictionary.Count);
int item;
Assert.False(dictionary.TryRemove(1, out item), "TestClear: FAILED. TryRemove succeeded after Clear");
Assert.True(dictionary.IsEmpty, "TestClear: FAILED. IsEmpty returned false after Clear");
}
public static void TestClear()
{
var dictionary = new NonBlocking.ConcurrentDictionary <int, int>();
for (int i = 0; i < 10; i++)
{
dictionary.TryAdd(i, i);
}
Assert.Equal(10, dictionary.Count);
dictionary.Clear();
#pragma warning disable xUnit2013 // Do not use equality check to check for collection size.
Assert.Equal(0, dictionary.Count);
#pragma warning restore xUnit2013 // Do not use equality check to check for collection size.
int item;
Assert.False(dictionary.TryRemove(1, out item), "TestClear: FAILED. TryRemove succeeded after Clear");
Assert.True(dictionary.IsEmpty, "TestClear: FAILED. IsEmpty returned false after Clear");
}
private static void TestRemove1(int cLevel, int threads, int removesPerThread)
{
NonBlocking.ConcurrentDictionary <int, int> dict = new NonBlocking.ConcurrentDictionary <int, int>(cLevel, 1);
string methodparameters = string.Format("* TestRemove1(cLevel={0}, threads={1}, removesPerThread={2})", cLevel, threads, removesPerThread);
int N = 2 * threads * removesPerThread;
for (int i = 0; i < N; i++)
{
dict[i] = -i;
}
// The dictionary contains keys [0..N), each key mapped to a value equal to the key.
// Threads will cooperatively remove all even keys
int running = threads;
using (ManualResetEvent mre = new ManualResetEvent(false))
{
for (int i = 0; i < threads; i++)
{
int ii = i;
Task.Run(
() =>
{
for (int j = 0; j < removesPerThread; j++)
{
int value;
int key = 2 * (ii + j * threads);
Assert.True(dict.TryRemove(key, out value), "Failed to remove an element! " + methodparameters);
Assert.Equal(-key, value);
}
if (Interlocked.Decrement(ref running) == 0)
{
mre.Set();
}
});
}
mre.WaitOne();
}
foreach (var pair in dict)
{
Assert.Equal(pair.Key, -pair.Value);
}
List <int> gotKeys = new List <int>();
foreach (var pair in dict)
{
gotKeys.Add(pair.Key);
}
gotKeys.Sort();
List <int> expectKeys = new List <int>();
for (int i = 0; i < (threads * removesPerThread); i++)
{
expectKeys.Add(2 * i + 1);
}
Assert.Equal(expectKeys.Count, gotKeys.Count);
for (int i = 0; i < expectKeys.Count; i++)
{
Assert.True(expectKeys[i].Equals(gotKeys[i]), " > Unexpected key value! " + methodparameters);
}
// Finally, let's verify that the count is reported correctly.
Assert.Equal(expectKeys.Count, dict.Count);
Assert.Equal(expectKeys.Count, dict.ToArray().Length);
}
