[amp_mcq option1=”hold and wait” option2=”deadlock avoidance” option3=”race around condition” option4=”buffer overflow E. None of the above” correct=”option1″]
The correct answer is E. None of the above.
The four necessary conditions for deadlock to exist are:
- Mutual exclusion: A resource can only be held by one process at a time.
- Hold and wait: A process that is holding a resource is waiting for another resource.
- No preemption: A resource cannot be taken away from a process that is holding it.
- Circular wait: There is a set of processes, P1, P2, …, Pn, such that P1 is holding resource R1, P2 is holding resource R2, …, Pn is holding resource Rn, and Pi is waiting for resource Ri+1.
Hold and wait, deadlock avoidance, race around condition, and buffer overflow are all concepts related to deadlock, but they are not necessary conditions for deadlock to exist.
Hold and wait is a situation in which a process is holding a resource and is waiting for another resource. This can lead to deadlock if the process that is holding the resource is also waiting for a resource that is held by the process that is waiting for the first resource.
Deadlock avoidance is a technique that can be used to prevent deadlock from occurring. It involves identifying the resources that can lead to deadlock and then ensuring that these resources are never allocated in a way that could lead to deadlock.
Race around condition is a situation in which two or more processes are competing for the same resource and the outcome of the competition depends on the order in which the processes access the resource. This can lead to deadlock if the processes are not able to access the resource in the order that they need it.
Buffer overflow is a situation in which a buffer is filled with more data than it can hold. This can lead to deadlock if the buffer is used to store resources that are needed by other processes.