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# Operating Systems Environment

Posted on 2011-03-04
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I'm doing a self study on my own and have gotten stuck on this question. Can any expert here help me out?

For the two systems described below, given that all of the devices are of the same. please help me answer these questions if you can:

a)      Determine the remaining needs for each job in each system.
b)      Determine whether each of the systems is safe or unsafe.

System A
System A has 12 devices; only 1 is available.

Job #      Devices Allocated      Maximum Required      Remaining needs
1            5                  6
2            4                  7
3            2                  6
4            0                  2

System B
System B has 14 devices; only 2 are available.

Job #      Devices Allocated      Maximum Required      Remaining needs
1            5                  8
2            3                  9
3            4                  8
0
Question by:fghabin
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Expert Comment

ID: 35042031
System A is safe.
System B is unsafe.

safety is determined by having a way to complete all jobs.
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Author Comment

ID: 35042084
IThanks for your response Arnold. I'm very new to this. how do you complete all jobs and whats the formula calculate/determine the remaining needs?
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LVL 78

Accepted Solution

arnold earned 500 total points
ID: 35043485
You have a job and the number of resources it was already allocated and the maximum number of resources it needs. Once the job is done, the resources of the job are released.

Lets say you were asked to build a shelf. You have been given a saw, and need a hammer.
Job:                           Allocated resources                              Maximum
Build shelf                          1                                                     2

Once you are given a hammer you can complete the task of building a sheld at the end of which a saw and hammer will become available for other tasks.
0

Author Comment

ID: 35044905
Thanks Arnold, it makes more sense now and I think I get it now. So I created the question below to test my knowledge.
System A
The following system (X) has 15 devices and only 1 is available.
Job #      Devices allocated   Max. required
1                   5                               14
2                   7                               10
3                   2                                 3

System B
The following system (Y) has 19 devices and only 1 is available.
Job #      Devices allocated    Max. required
1                  10                              18
2                   3                               10
3                   5                                 6

So I think both System A and System B are UNSAFE. Do you agree?
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Author Comment

ID: 35045075
After reviewing this again, I think System A is safe and System B in unsafe
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