static void Main(string[] args)
{
Customer y = new Customer("Tan Ah Kow", "20, Seaside Road", "XXX20", new DateTime(1989, 10, 11));
Customer z = new Customer("Kim Lee Keng", "2, Rich View", "XXX9F", new DateTime(1993, 4, 25));
BankAccount2 a = new BankAccount2("001-001-001", y, 2000);
BankAccount2 b = new BankAccount2("001-001-002", z, 5000);
Console.WriteLine(a.Show());
Console.WriteLine(b.Show());
a.Deposit(100);
Console.WriteLine(a.Show());
a.Withdraw(200);
Console.WriteLine(a.Show());
a.TransferTo(300, b);
Console.WriteLine(a.Show());
Console.WriteLine(b.Show());
}
static void Main(string[] args)
{
var tasks0 = new List <Task>();
var ba0 = new BankAccount2();
for (int i = 0; i < 10; ++i)
{
tasks0.Add(Task.Factory.StartNew(() =>
{
for (int j = 0; j < 1000; ++j)
{
ba0.Deposit(100);
}
}));
tasks0.Add(Task.Factory.StartNew(() =>
{
for (int j = 0; j < 1000; ++j)
{
ba0.Withdraw(100);
}
}));
}
Task.WaitAll(tasks0.ToArray());
Console.WriteLine($"Final balance is {ba0.Balance}.");
// show interlocked methods here
// Interlocked.MemoryBarrier is a wrapper for Thread.MemoryBarrier
// only required on memory systems that have weak memory ordering (e.g., Itanium)
// prevents the CPU from reordering the instructions such that those before the barrier
// execute after those after
Console.WriteLine("All done here.");
Console.WriteLine();
#region Mutex
var tasks = new List <Task>();
var ba = new BankAccount3(0);
var ba2 = new BankAccount3(0);
// many synchro types deriving from WaitHandle
// Mutex = mutual exclusion
// two types of mutexes
// this is a _local_ mutex
Mutex mutex = new Mutex();
Mutex mutex2 = new Mutex();
for (int i = 0; i < 10; ++i)
{
tasks.Add(Task.Factory.StartNew(() =>
{
for (int j = 0; j < 1000; ++j)
{
bool haveLock = mutex.WaitOne();
try
{
ba.Deposit(1); // deposit 10000 overall
}
finally
{
if (haveLock)
{
mutex.ReleaseMutex();
}
}
}
}));
tasks.Add(Task.Factory.StartNew(() =>
{
for (int j = 0; j < 1000; ++j)
{
bool haveLock = mutex2.WaitOne();
try
{
ba2.Deposit(1); // deposit 10000
}
finally
{
if (haveLock)
{
mutex2.ReleaseMutex();
}
}
}
}));
// transfer needs to lock both accounts
tasks.Add(Task.Factory.StartNew(() =>
{
for (int j = 0; j < 1000; j++)
{
bool haveLock = Mutex.WaitAll(new[] { mutex, mutex2 });
try
{
ba.Transfer(ba2, 1); // transfer 10k from ba to ba2
}
finally
{
if (haveLock)
{
mutex.ReleaseMutex();
mutex2.ReleaseMutex();
}
}
}
}));
}
Task.WaitAll(tasks.ToArray());
Console.WriteLine($"Final balance is: ba={ba.Balance}, ba2={ba2.Balance}.");
#endregion
}
