Midterm

Question 1

What is the minimum number of threads in a process?

Answer 1

One

Question 2

What is the basic executable unit in Windows?

Answer 2

Thread

Question 3

TLS

Answer 3

Thread Local Storage

Question 4

What is Thread Local Storage?

Answer 4

A collection of pointers for a thread to allocate storage

Question 5

What function is used to create a process?

Answer 5

CreateProcess()

Question 6

How many threads does the CreateProcess() function create?

Answer 6

One

Question 7

How many parameters does CreateProcess() have?

Answer 7

10

Question 8

What is the return type of CreateProcess()?

Answer 8

Bool

Question 9

What object has the handles for the thread and process after CreateProcess() runs?

Answer 9

PROCESS_INFORMATION

Question 10

Does CloseHandle() terminate the thread?

Answer 10

No, it only deletes the reference within the process

Question 11

What two things are returned for both the thread and the process created using CreateProcess()

Answer 11

1. Handle
2. ID

Question 12

Each process/thread has a unique ______ for the lifetime of the object, but can have many ______.

Answer 12

ID, Handles

Question 13

If ApplicationName parameter is set to NULL in CreateProcess(), what will the program name be?

Answer 13

The first white-space-deliminated token in CommandLine

Question 14

What function does a thread in a process use to terminate the process?

Answer 14

ExitProcess()

Question 15

What function does a process use to terminate a different process?

Answer 15

TerminatePocess()

Question 16

What are the 2 wait functions?

Answer 16

1. WaitForSingleObject()
2. WaitForMultipleObjects()

Question 17

What is the maximum number of wait objects for WaitForMultipleObjects() function?

Answer 17

64

Question 18

What data type are the times returned from GetProcessTimes()?

Answer 18

FILETIME

Question 19

How many parameters does the CreateThread() function take?

Answer 19

6

Question 20

What is the thread function signature?

Answer 20

DWORD WINAPI ThreadFunc (LPVOID)

Question 21

What can the thread interpret the argument passed to the thread function as?

Answer 21

DWORD or Pointer

Question 22

How do you create a thread that doesn’t start immediately after creation?

Answer 22

dwCreationFlags = CREATE_SUSPENDED

Question 23

How do you start a suspended thread?

Answer 23

ResumeThread()

Question 24

What state does the wait function wait for from the object?

Answer 24

Signaled

Question 25

Why use _beginthreadex?

Answer 25

Thread-safe C library implementation

Question 26

What is the thread-safe C library called?

Answer 26

LIBCMT.LIB

Question 27

What needs to be done for the return type of _beginthreadex()?

Answer 27

Cast to a HANDLE type reinterpret_cast< HANDLE >

Question 28

What are the thread states?

Answer 28

Initialized Ready Standby Running Waiting Terminated

Question 29

What does the Sleep() function do to a thread?

Answer 29

Moves the thread from a running to a wait state

Question 30

What does the keyword volatile mean?

Answer 30

Ensures that the variable will be stored in memory after modification.

Question 31

What 2 rules apply to using the volatile keyword?

Answer 31

1. Modified by at least one thread 2. Accessed by two or more threads

Question 31

How do you use an interlock function to increment?

Answer 31

InterlockedIncrement()

Question 32

Which 3 synchronization objects are kernel objects?

Answer 32

1. Mutexes 2. Semaphores 3. Events

Question 33

How many threads can be in a CRITICAL_SECTION at one time?

Answer 33

One

Question 34

What function is used to initialize a CRITICAL_SECTION?

Answer 34

InitializeCriticalSection()

Question 35

What function blocks a thread if another thread is in the CRITICAL_SECTION?

Answer 35

EnterCriticalSection()

Question 36

What function unblocks a waiting thread from a CRITICAL_SECTION?

Answer 36

LeaveCriticalSection()

Question 37

What is the timeout for the EnterCriticalSection() function?

Answer 37

There is no timeout

Question 38

When is a semaphore in a signalled state?

Answer 38

When the count is greater than zero.

Question 39

What does a semaphore in a signalled state signify?

Answer 39

The number in the count is the number of threads that can proceed

Question 40

How do you instantiate a mutex?

Answer 40

lock_guard< mutex >

Question 41

What does the std::thread::join method do?

Answer 41

Blocks the current thread until the thread identified finishes execution

Question 42

What does the detach() function do on a thread?

Answer 42

Thread will run independently from main thread and clean up its resources automatically after completion

Question 43

What is different about jthread?

Answer 43

Automatically joins the thread when destroyed

Question 44

What are the 3 issues with the traditional Singleton C++ implementation?

Answer 44

1. Destructor never executes 2. Object doesn't initialize until referenced 3. Not thread-safe

Question 45

What is DCLP?

Answer 45

Double Check Locking Pattern

Question 46

What are 3 alternative names for Memory Barriers?

Answer 46

1. Membars 2. Memory Fence 3. Fence instruction