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Ludmilka [50]
3 years ago
5

The four conditions (mutual exclusion, hold and wait, no preemption and circular wait) are necessary for a resource deadlock to

occur. Give an example to show that these conditions are not sufficient for a resource deadlock to occur. When are these conditions sufficient for a resource deadlock to occur
Business
1 answer:
Evgen [1.6K]3 years ago
5 0

Explanation:

The conditions sufficient for a resource deadlock to occur is when a  deadlock will  prevail for process A, B, and C when two resources R and S; if only one instance of each resources is allowed.

Solution

Deadlock conditions

A deadlock is a situation where two or more processes request for same critical resource at the same time.

The mutual exclusion applies a restriction to a resource when the resource is used by any process, it should become unavailable for the other resources

The hold and wait allocations explains that any process which is allocate resources must hold them; till all needed resources are nor sure.

In the meantime, if any other processes need a resource which is held by another process, then the latter will release the resource to prevent deadlock.

No pre-emption states that the operating system can grant access to resources to another process while it is in use by another process; depending on the priority , to prevent deadlock.

Circular wait should not be implemented so that resources being requested by process are allocated when they get free.

Now,

Three processes A, B, and C functions on a system, having two distinct resources R and S.

The resource  R has one instant active while resource S has two instances available.

The instance of R is allocated to a process A after request. first instance of resource S is allocated to process B, and second instance of resource S is allocated to process C.

When a request is placed by process B for resource R, then the resource is not available for execution. the process A request for resource S which is used by both C and B.

All the four conditions prevail in this situation; yet deadlock does not occur.

The resource S is released by process C and is allocated to process A. when process A finishes, it releases resources and resources R is allocate d to process B.

Hence all three processes end without a deadlock.

However, the deadlock will prevail for process A, B, and C when two resources R and S; if only one instance of each resources is allowed.

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8%

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The face value of the bond is 1000 dollars

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It's NOT $65,000

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you have the choice of two equally risk​ annuities, each paying​ $5,000 per year for 8 years. one is an annuity due and the othe
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You have the option of two equally risk​ annuity, each paying​ $5,000 per year for 8 years. The is an annuity due and the other is an ordinary annuity. If you are going to be receiving the annuity​ payments, the annuity due would you choose to maximize your​ wealth.

What is an Ordinary Annuity?

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Pincus Associates uses the allowance method to account for bad debts. During 2021, its first year of operations, Pincus provided
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Answer:

What journal entry did Pincus record to write off uncollectible accounts during 2021

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Cr Accounts receivable $ 6,300

What journal entry did Pincus record to recognize bad debt expense for 2021?

Dr Bad Debt Expense $ 8,040

Cr Allowance for Uncollectible Accounts $ 8,040

Explanation:

Pincus provided a total of $156,000 of services on account.  

Dr Accounts receivable $ 156,000

Cr Sales $ 156,000

In 2021, the company wrote off uncollectible accounts of $6,300  

Dr Allowance for Uncollectible Accounts $ 6,300

Cr Accounts receivable $ 6,300

By the end of 2021, cash collections on accounts receivable totaled $132,300.  

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Cr Accounts receivable $ 132,300

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Pincus estimates that 10% of the accounts receivable balance at 12/31/2021 will prove uncollectible.  

Dr Bad Debt Expense $ 8,040

Cr Allowance for Uncollectible Accounts $ 8,040

If the company applies the allowance method, it means that the account Allowance for Uncollectible Accounts must show as balance the % of estimated value.

Because the company already has a DEBIT balance ($6,300) in the Allowance for Doubtful Accounts  it's necessary to register an entry that COMPLEMENT ($8,040) the existing value and reflect the value estimated as bad debts ($1,740).

Bad Debt Expense = $8,040 - $6,300 = $1,740

It's necessary to reflect $1,740 in the Allowance for Uncollectible Accounts as Credit, so we need an entry of $8,040.

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