||| VuHelp4U ||| cs604 1st Question ans...............................

 

Q#1

 

 

 

Process	Max Need	current Usage
P3	8	3
P4	5	1
P5	8	2
Available=4

 

 

 1st we determine the Need   for each process.

Max need = Need +Allocated

Need  = Max Need – Allocated

 

 

 

Process	Max Need	Current usage	Need = Max Need - current usage
p3	8	3	5
p4	5	1	4
p5	8	2	6

 

 

 

Now our table will become such as

 

 

Process	Current usage	Need	Available
P3	3	5
P4	1	4
P5	2	6

 

 

 

 

Process	Current usage	Need	Available
P3	3	5	4
P4	1	4
P5	2	6

 

 

Safe sequence <P4>

 

 

 

And current table will come as

 

Process	Current usage	Need	Available
P3	3	5	4
P4	1	4	5
P5	2	6

 

 

Safe sequence <P4, P3>

 

 

 

And our table will become

 

 

 

 

Process	Current usage	Need	Available
P3	3	5	4
P4	1	4	5
P5	2	6	8

 

 

Safe sequence <P4, P3, P5>   Required Ans.

 

 

 

Q#2

Sample code for monitor class in standard C

 

monitor class Account {

private int balance = 0
invariant balance >= 0

public method boolean withdraw(int amount)
precondition amount >= 0
{
if balance < amount then return false
else { balance = balance – amount ; return true }
}

public method deposit(int amount)
precondition amount >= 0
{
balance = balance + amount
}
}

-- 

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Q k " is poori kinaat main jitni jaldi Rab Raazi hota
hai " itni jaldi koi Raazi nahi hota .

 

 

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