Page 29 - slides.dvi

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•
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If
4.
8
4
–
4
8
2.
8
1.
3.
Operating
CPU
a
a
a
a
Recall:
There
e.g.
only
open
more
Systems
solves
simple
CPU
are
timer
Otherwise
—
to
a
waiting
process
to
running
make
introduces
CPU
the
denial
Windows
denial
Scheduler
expires
of
scheduler
of
process
Scheduling
number
process
complicated
3.11,
of
implement
terminates
to
scheduling
scheduler
service
concurrency
is
selects
service
blocks
early
(running
unblocks
one
→
decision
occasions
(running
of
problem
implement
problems.
MacOS.
→
.
the
(running
under
.
preemptive.
when
ready)
(blocked
→
1,
we
→
4
exit)
ready
⇒
ready)
blocked)
have
can/must
processes
a
and
choose
a
new
allocates
non-preemptive
the
process
CPU
to
to
scheduler:
run:
25
it.