Bissoy.com
Doctors Medicines MCQs Q&A

  1. Any one of I and III but not II or IV
  2. Any one of I, III, and IV but not II
  3. Any one of II and III but not I or IV
  4. Any one of I, II, III and IV
5 views

1 Answers

Option 4 : Any one of I, II, III and IV

Concept:

A deadlock will not occur if one of the following four conditions doesn’t occur :

  • Mutual exclusion: it prevents simultaneous access to a shared resource.
  • Hold and wait: Process is holding a resource that may be required by other processes.
  • Circular wait: It means there are processes which are waiting for other processes to finish.
  • No pre-emption: If a process that is holding some resources requests another resource and that  resource cannot be allocated to it, then it must release all resources that are currently allocated to it.


Explanation:

Option 1:

Processes should acquire all their resources at the beginning of execution. If any resource is not available, all resources acquired so far are released. If this is allowed , then hold and wait will never occur. So, deadlock will not occur.

Option 2:

The resources are numbered uniquely, and processes are allowed to request for resources only in increasing resource numbers. It violates circular wait .

Option 3:

The resources are numbered uniquely, and processes are allowed to request for resources only in decreasing resource numbers. It also violates circular wait.

Option 4:

The resources are numbered uniquely. A process is allowed to request only for a resource with resource number larger than its currently held resources. It also violates circular wait.

So, all options are needed to prevent deadlock. 
5 views

Related Questions

Based on the paragraph given below answer the following question: The traditional methods of combinational circuits involve simplification and realization using gates. Using these methods, complex functions have been integrated and are easily available in IC form. There is an attractive array of devices like a multiplexer, demultiplexer, decoders, comparators, parity generators/checkers, which significantly reduce IC package count thereby reducing the system cost. The system design is greatly simplified because the laborious and time-consuming simplification methods are generally not required with these devices. This also improves the reliability of the system by reducing the number of external wired connections. But they have some limitations as well. Different memories like ROM, PROM can also be used to implement combinational circuits without much simplification. In a BCD Subtractor if the sum of minuend and the nine’s complement of the subtrahend is not a valid BCD Code, then which binary number is added to the sum to get the correct answer?
1 Answers 4 Views
In the following question, the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ the passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/ passage and find out which of the four combinations is correct. 1. Carbon-intensive firms are likely to lose 43% of their value thanks to policies designed to combat climate change, a report says. P. Representatives of fossil fuel companies told the BBC they were already adapting their businesses to take climate change into account. Q. But the PRI study suggests major winners and losers will emerge between, and within, big sectors. Car-makers with the swiftest transition to electric vehicles (EVs), for instance, are projected to increase in value by 108%, according to the study by Vivid Economics. R. The forecast was commissioned by the UN-backed Principles for Responsible Investment (PRI). S. Meanwhile the most progressive companies will see an uplift of 33% in their value. 6. Manufacturers slow to move to EVs will see their value fall, as governments realize that petrol and diesel models must be phased out faster for climate targets to be met.?
1 Answers 5 Views