public static void TestSingletonThreadSafe()
{
Console.Clear();
Console.WriteLine("TestSingletonThreadSafe");
Thread process1 = new Thread(() =>
{
SingletonThreadSafe s1 = SingletonThreadSafe.GetInstance("Foo");
Console.WriteLine(s1.Value);
//Singleton s1 = Singleton.GetInstance();
//s1.SomeBusinessLogic();
});
Thread process2 = new Thread(() =>
{
SingletonThreadSafe s2 = SingletonThreadSafe.GetInstance("bar");
Console.WriteLine(s2.Value);
//Singleton s2 = Singleton.GetInstance();
//s2.SomeBusinessLogic();
});
process1.Start();
process2.Start();
process1.Join();
process2.Join();
Wait();
}
public static SingletonThreadSafe getInstance()
{
lock (typeof(SingletonThreadSafe))
{
if (instance == null)
{
instance = new SingletonThreadSafe();
}
}
return(instance);
}
public static SingletonThreadSafe GetSingleton()
{
lock (singletonLock) // a thred needs to aquire the lock to execute below code
{
if (singleton == null)
{
singleton = new SingletonThreadSafe();
}
return(singleton);
}
}
public static SingletonThreadSafe GetInstance()
{
lock (objSync)
{
if (theInstance == null)
{
theInstance = new SingletonThreadSafe();
}
return(theInstance);
}
}
public static SingletonThreadSafe GetInstance()
{
lock (lockObj)
{
if (_instance == null)
{
_instance = new SingletonThreadSafe();
}
}
return(_instance);
}
public static SingletonThreadSafe getInstance()
{
if (instance == null)
{
lock (lockObj)
{
if (instance == null)
{
instance = new SingletonThreadSafe();
count++;
}
}
}
return(instance);
}
private static void CheckEquality(SingletonThreadSafe singleton1, SingletonThreadSafe singleton2)
{
if (singleton1 == singleton2)
{
Console.WriteLine("==");
}
if (singleton1.Equals(singleton2))
{
Console.WriteLine("equals");
}
if (object.ReferenceEquals(singleton1, singleton2))
{
Console.WriteLine("ReferenceEquals\n");
}
}
static void Main(string[] args)
{
var singleton1 = SingletonThreadSafe.GetSingleton();
var singleton2 = SingletonThreadSafe.GetSingleton();
CheckEquality(singleton1, singleton2);
var singleton3 = SingletonLazyThreadSafe.GetSingleton().Value;
var singleton4 = SingletonLazyThreadSafe.GetSingleton().Value;
CheckEquality(singleton3, singleton4);
var singleton5 = new SingletonLazyThreadSafe();
CheckEquality(singleton4, singleton5); // Should not print anything as it vioaltes singleton
Console.ReadKey();
}
public static void setNullInstance()
{
instance = null;
}
