A banker with only $100,000 loans $50,000 to
each of two customers. Later, both customers
return with the story that before they can repay
their loans they must each borrow another
$10,000 to complete the business deals in which
their previous loans are involved. The banker
resolves this deadlock by borrowing the additional
funds from another source and passing
on this loan (with an increase in the interest rate)
to the two customers. Which of the three conditions
for deadlock has the banker removed?
Q235: Students who want to enroll in Model Railroading
II at the local university are required to
obtain permission from the instructor and pay
a laboratory fee. The two requirements are fulfilled
independently in either order and at
different locations on campus. Enrollment is
limited to twenty students; this limit is maintained
by both the instructor, who will grant
permission to only twenty students, and the
financial office, which will allow only twenty
students to pay the laboratory fee. Suppose that
this registration system has resulted in nineteen
students having successfully registered for the
course, but with the final space being claimed
by two students—one who has only obtained
permission from the instructor and another
who has only paid the fee. Which requirement
for deadlock is removed by each of the following
solutions to the problem?
a. Both students are allowed in the course.
b. The class size is reduced to nineteen, so
neither of the two students is allowed to
register for the course.
c. The competing students are both denied
entry to the class and a third student is
given the twentieth space.
d. It is decided that the only requirement for
entry into the course is the payment of the
fee. Thus the student who has paid the fee
gets into the course, and entry is denied to
the other student.