1. A deadlocked state occurs whenever: A) a process is waiting for I/O to a device that does not exist B) the system has no available free resources C) every process in a set is waiting for an event that can only be caused by another process in the set D) a process is unable to release its request for a resource after use 2. One necessary condition for deadlock is held in a non-sharable mode. which states that at least one resource must be A) hold and wait B) mutual exclusion C) circular wait D) no preemption 3. One necessary condition for deadlock is one resource and waiting to acquire additional resources. A) hold and wait B) mutual exclusion C) circular wait D) no preemption which states that a process must be holding

Quèstion 20 The requirement of extra storage and copy operation is a disadvantage of in-out mode with Pass-by-Reference. True False

Multi-tasking can not be achieved with a single processor machine.  True  False       2. Async/Await is best for network bound operations while multi-threading and parallel programming is best for CPU-bound operations.  True  False     3. The following is a characteristic of an async method:The name of an async method, by convention, ends with an "Async" suffix.  True  False   4. Using asynchronous code for network bound operations can speed up the time needed to contact the server and get the data back.  True  False     5. Asynchronous programming has been there for a long time but has tremendously been improved by the simplified approach of async programming in C# 5 through the introduction of:  The Task class  True  False

Select all statements below that are true O A set of processes is in a safe state S if S is not a deadlock state and any state T reachable from S is not a deadlock state. In order for a deadlock to occur, only one of the four conditions necessary for deadlocks to occur must be satisfied. O A deadlock means that at least two processes cannot continue working because they are waiting for each to make resources available. о One of the the four conditions necessary for deadlocks to occur is non- preemption. Interrupts, messages, and signals are examples of consumable resources. Reusable resources are produced and consumed dynamically. QL - DELL W

Operating system -pls fill in the blanks for the following questions.

Concurrent Processes / Monitors select which is true options: a CV (condition variable) queues in a monitor store suspended processes waiting on the corresponding condition.      b The "Signal and Wait" approach (Hoare semantics) leads to more efficient implementation and reduces the number of context switches. c Two or more processes can be active in the same monitor simultaneously. d When the "Signal and Continue"-approach (Mesa semantics) is applied, the signaling process P continues executing.  e The monitor-based solution to the Dining-Philosophers problem discussed in class is restricted to 5 philosophers.