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What are the necessary conditions for deadlocks?
1.Mutual exclusion: Only one process at a time is able to use the resource.
2.Hold and wait: A process should be holding at least one resource and waiting to acquire additional resources that are currently being held by other processes.
3.No preemption: Resource cannot be preempted that is, a resource is able to be released only voluntarily by the process holding it, subsequent to that process has completed its task.
4.Circular wait:A set {p0,p1,.........,pn} of waiting processes should exit such that p0 is waiting for a resource that is held by p1 and p1 is waiting for a resource that is held by p2,.........,pn-1 is waiting for a resource that is held by pn, and pn is waiting for a resource that is held by p0.
1. What must a kernel provide for an effective user-level thread implementation? 2. With respect to the quantum q in a scheduling algorithm, explain and discuss the impact of th
What are the advantages of Contiguous allocation? The advantages are a. Supports direct access b. Supports sequential access c. Number of disk seeks is minimal.
Another solution then would be to keep a pool of threads. Whenever a new task arrives, the system would simply get a thread from pool and set that thread to work on the given task.
protection in operating system
what is segmentation as it refers to operating system
Determine the reasons for Poor response time Process busy or High I/O rates or High paging rates
What are overlays? To enable a process to be larger than the amount of memory allocated to it, overlays are used. The idea of overlays is to keep in memory only those instructi
What are conditions under which a deadlock situation may arise? A deadlock situation can arise if the following four conditions hold simultaneously in a system: a. Mutual ex
What is indexed allocation? Every file has its own block of pointers to the sectors of the file.
limitations
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