public static Singletone_ThreadSafety GetInstance()
{
// it will create multiple objects in multithreaded situation
//if(instance == null)
//{
// instance = new Singletone_ThreadSafety();
//}
// to avoid this situaton thread lock is the solution (to control thread race situation)
// lock
// when employee and students try to create object at same time the lock will prevent by
// allowing first one completion and next one will wait until completon of first one
//lock (obj)
//{
// if(instance == null)
// {
// instance = new Singletone_ThreadSafety();
// }
//}
// Note: Locks are very expensive and no need to use lock every time
// how to avoid unnecessary lock checking -- null check with instance
if (instance == null)
{
// https://en.wikipedia.org/wiki/Double-checked_locking
lock (obj)
{
if (instance == null)
{
instance = new Singletone_ThreadSafety();
}
}
}
return(instance);
}
private static void PrintEmployeeDetails()
{
Singletone_ThreadSafety fromEmployee = Singletone_ThreadSafety.GetInstance();
fromEmployee.PrintDetails("From Employee");
}
private static void PrintStudentDetails()
{
Singletone_ThreadSafety fromStudent = Singletone_ThreadSafety.GetInstance();
fromStudent.PrintDetails("From Student");
}
