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In order for deadlock to occur, four conditions must be true.
- Mutual exclusion - Each resource is either currently allocated to exactly one process or it is available. (Two processes cannot simultaneously control the same resource or be in their critical section).
- Hold and Wait - processes currently holding resources can request new resources
- No preemption - Once a process holds a resource, it cannot be taken away by another process or the kernel.
- Circular wait - Each process is waiting to obtain a resource which is held by another process.
What else can I help you with?
What is safety algorithms in operating system?
safety algorithm is algo which is used for deadlock avoidance.
Define how operating system is a control program?
operating system is a control program as it allow multiple task to performed on same window.
What is General characteristics of optimal operating system?
What exactly do you mean by 'optimal operating system'? If you don't define the term there is no way to answer the question.
Define the relationship between operating system software and utility software?
Operating system software .....OPERATES !! and utility software....UTILIZES !! ..now go do your research .
Define NFS in operating system?
NFS is the Network File System, and allows directories from systems to be used in other systems in a sharing arrangement.
What is safety algorithms in operating system?
safety algorithm is algo which is used for deadlock avoidance.
Define how operating system is a control program?
operating system is a control program as it allow multiple task to performed on same window.
What is General characteristics of optimal operating system?
What exactly do you mean by 'optimal operating system'? If you don't define the term there is no way to answer the question.
What are policies that define specific operating system functions?
User Rights
Can you define dos briefly?
DOS is short for disk operating system.
What is the difference between mode and state?
States define an exact operating condition of a system, where modes define the set of capabilities or functions which are valid for the current operating condition. (Source: http://themanagersguide.blogspot.com.au/2011/01/6322-define-life-cycle-system-modes.html)
Define the relationship between operating system software and utility software?
Operating system software .....OPERATES !! and utility software....UTILIZES !! ..now go do your research .
What is the difference among deadlock avoidance detection and prevention?
Deadlock prevention is the name of the technique that is designed to get rid of deadlocks by changing the specifications of the system , that is the system design change. This is , basically , about how requests about resources are made and how they are permitted. However , deadlock avoidance is a technique that aims to check deadlock possibility dynamically and decides whether it is safe to grant a resource or not. It ,definitely , needs extra information about potential use of resources for each process. Deadlock Prevention: Preventing deadlocks by constraining how requests for resources can be made in the system and how they are handled (system design). The goal is to ensure that at least one of the necessary conditions for deadlock can never hold. Deadlock Avoidance: The system dynamically considers every request and decides whether it is safe to grant it at this point, The system requires additional apriori information regarding the overall potential use of each resource for each process. Allows more concurrency. Similar to the difference between a traffic light and a police officer directing traffic.
What does POSIX real time Thread specification define?
"Portable Operating System Inferance (for Unix)
What is deadlock in rdbms?
A deadlock is a situation in which two or more competing actions are each waiting for the other to finish, and thus neither ever does. In an operating system, a deadlock is a situation which occurs when a process enters a waiting state because a resource requested by it is being held by another waiting process, which in turn is waiting for another resource. If a process is unable to change its state indefinitely because the resources requested by it are being used by another waiting process, then the system is said to be in a deadlock.
Deadlock deterioates affect system performance?
how dealocks affects the system
Advantage and disadvantage of deadlock prevention?
Advantage: Deadlock prevention techniques eliminate the possibility of deadlock occurring in a system, ensuring system availability and preventing resource wastage. Disadvantage: Deadlock prevention techniques may lead to reduced system performance or resource utilization, as they often involve overhead in terms of additional checks or restrictions on resource allocation.
