Ornamental Garden Problem
A large ornamental garden is open
to members of the public who can enter through either one of two
turnstiles to the East and to the West of the garden. The
management want to determine how many people are in the garden at
any one time. They design a computer system to do this. In the
program produced, each turnstile is represented by a thread and
updates a shared Counter object.
This version does not work
correctly as can be observed, increments to the Counter are lost
so that the total number of people in the garden is not the sum
of the people who entered through the turnstiles. Click on the
checkbox to rerun using a counter with mutually exclusive access.
Last modified: 07-Feb-2003