1847352
Question 1
Question
What is the mechanism of ensuring that two threads don't execute portions of a program at the same time?
Answer
-
Synchronization
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Alignment
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Hazard-Checking
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Paralellization
Question 2
Question
Can you pass an integer to a thread as a parameter?
Answer
-
Yes, but only as an Object. It must be cast inside the thread.
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Yes.
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No.
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No, unless it is a foreground thread.
Question 3
Question
What does the [Threadstatic] attribute in a variable entail?
Answer
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Each copy of a spawned thread has its own copy of a field.
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Each copy of a spawned thread can manipulate the field.
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The field can only be modified by one thread at a time.
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The field can be modified by the main thread, or any spawned foreground threads.
Question 4
Question
How would you add a sequence to a Task?
Answer
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.ContinueWith((FirstTask){ //Func })
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.NextTask((FirstTask){ //Func })
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.Continue((FirstTask){ //Func })
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.Then((FirstTask{ //Func })
Question 5
Question
Which are acceptable overloads of the .ContinueWith function?
Answer
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TaskContinueationOptions.OnlyCancelled
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TaskContinueationOptions.OnlyOnFaulted
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TaskContinueationOptions.OnlyRanToCompletion
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TaskContinueationOptions.OnlyBlocked
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TaskContinueationOptions.OnlyStopped
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TaskContinueationOptions.OnlyCompleted
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TaskContinueationOptions.OnlyOnCompletion
Question 6
Question
What does a task object do?
Answer
-
Spawn a new thread.
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Spawn a new process.
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Nothing, it's syntactic sugar
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Provides a method of managing thread resources.
Question 7
Question
What principles should you keep in mind while creating an asynchronous method?
Answer
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Always use await statements.
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Avoid returning void.
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Be sure to test to ensure a performance increase.
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Return a Task or Task<T>
Question 8
Question
ConcurrentStacks allow enumeration
Answer
- True
- False
Question 9
Question
You havve a lot of items that need to be processed. For each item, you need to perform complex arithmetic that takes up moderate CPU time. Which technique should you use?
Answer
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Create a Task for each item, and wait till all of them are finished
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Use a Parallel.For to process all items concurrently
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Use Async/Await to process all items concurrently
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Add all items to a BlockingCollection and process them on a thread created by the thread class.
Question 10
Question
You are creating a complex query that doesn't require any particular order, and you want to run it as parallel. Which method should you use?
Answer
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AsParallel
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AsSequential
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AsOrdered
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WithDegreeOfParallelism
Question 11
Question
In an ASP.NET project, your application retrieves data from a remote server and writes the response to a database. Should you use the Async/Await keywords for processing?
Answer
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Yes, this will free your thread to serve other requests while waiting for a naturally occurring I/O bottleneck.
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No, both operations depend on external factors. You must wait before they are finished.
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No, in a server application you don't have to use async/await, as the keywords are primarily used in client applications.
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Yes, this puts your thread to sleep while waiting for I/O so it uses no CPU time.
Question 12
Question
What does the volatile keyword do?
Answer
-
Ensures that individual copies of a variable are stored in memory
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Disables compiler optimizations that assume a single-threaded application
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Ensures a variable is never added to a swap file on a disk
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Informs the compiler that the variable will be heavily accessed
Question 13
Question
Is var++ an atomic operation?
Answer
- True
- False
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