public void Singleton_Should_Be_Thread_Safe()
{
int threadsCount = 10;
EventWaitHandle threadsFinished = new EventWaitHandle(false, EventResetMode.AutoReset);
MockSingleton[] singletons = new MockSingleton[threadsCount];
Thread[] threads = new Thread[threadsCount];
Barrier startBarrier = new Barrier(threadsCount);
Barrier finishBarrier = new Barrier(threadsCount, (barrier) => threadsFinished.Set());
for (int i = 0; i < threadsCount; i++)
{
threads[i] = new Thread((idx) => {
startBarrier.SignalAndWait(); // Wait for creating all other threads
try {
singletons[(int)idx] = Singleton <MockSingleton> .Instance;
} catch { }
finishBarrier.SignalAndWait(); // Wait for finishing all other threads
});
threads[i].Start(i);
}
threadsFinished.WaitOne();
var inst = Singleton <MockSingleton> .Instance;
inst.IntProperty++;
Assert.IsTrue(singletons.All(x => x.IntProperty == inst.IntProperty), "Singleton<T> shoud inplement thread safe initialization");
}
public void CreateSingletonTest()
{
MockSingleton.CreateInstance(() => new MockSingleton {
Id = 45
});
var m1 = MockSingleton.Instance;
MockSingleton.Instance.Id = 5;
Assert.Equal(m1, MockSingleton.Instance);
Assert.NotEqual(45, m1.Id);
}
public void Singleton_CRTP_Creates_The_Instance()
{
MockSingleton.InitSingleton();
Assert.NotNull(MockSingleton.Instance);
MockSingleton.DestroySingleton();
}
