(a) In an environment where several users share access to a single database, can one user ever block another's access for an unlimited period of time? (This situation is called an indefinite postponement.) (b) Describe a scenario in which two users could cause the indefinite postponement of each other. (c) Describe a scenario in which a single user could cause the indefinite postponement of all
users.
What will be an ideal response?
Indefinite
postponement
is
also
known
as
deadlock.
It
occurs
when
one
task
holds
a
resource
being
waited
for
by
a
second
task,
and
the
second
holds
a
resource
being
waited
for
by
the
first.
Because
each
is
waiting
for
the
other,
neither
will
ever
release
its
resource
and
allow
the
other
to
proceed.
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