Tuesday, January 15, 2008

CS 223 Assignmet #4

1. The major difference between deadlock, starvation and race is that in deadlock, the problem occurs when the jobs are processed. Starvation, however is the allocation of resource that prevents one job to be executed. Race occurs before the process has been started.2.
Deadlock: When two basketball player are about to shoot in one basket in a practice game.
Starvation: When a person siutoring a girl while the girl has a boyfriend already.

Race: When two guys have the same girlfriend.
3. Four necessary condition needed for the deadlock from exercise #2:
if the product is only one.
if the two person needed that one product urgently.
if there's other alternative products available.
if the two person are brand concious and the product happen to be what they like.

5. figure 5.16 shows a tunnel going trough a mountain and two streets parallel to each other- one at each intrance/exit of the tunnel. Traffic light are located at each end of the tunnel to control the crossflow of tghe traffic through each intersection.
a. Deadlock will not happen because there are two traffic lights that control the traffic.The deadlock may when some of the motorist dont follow the traffic light because there's only one bridge to drive through.
b. Deadlock can be detected when there will be a huge bumper to bumper to the traffic and there will be accident that will happen.
c. The solution to prevent deadlock is that, the traffic lights should be accurate and motorist should follow it. In order to have a nice driving through the bridge.

6. Based on figure 5.17 answer the following question.
a. Is this system deadlock?
-this is an deadlock because P2 still requesting or waitng for R1 that has already been allocated.
b. Are there any block process?
- yes because the resources that needed by P2 was allocated already by P1.