void Barber()
{
while (true)
{
label1.Text += "barber waiting for customer...\n";
CustomerWaiting.Wait();
label1.Text += "barber has customer...\n";
WaitingRoom.Wait();
NumSeats++;
WaitingRoom.Release();
Thread.Sleep(3000);
label1.Text += $"barber finished cutting.\n";
BarberReady.Release();
}
}
void Customer(int id)
{
label1.Text += $"customer {id} enters.\n";
WaitingRoom.Wait(); // Block NumSeats for this thread.
if (NumSeats > 0)
{
NumSeats--; // Took a seat.
label1.Text += $"customer {id} took a seat; {NumSeats} seats left.\n";
WaitingRoom.Release();
CustomerWaiting.Release(); // Signal a customer is waiting.
label1.Text += $"customer {id} waiting...\n";
BarberReady.Wait(); // Wait for barber to be ready.
}
else
{
WaitingRoom.Release();
label1.Text += $"customer {id} got no hair cut.\n";
}
}