Concurrency basics Quiz

Test your understanding of concurrency fundamentals, including key concepts like race conditions, synchronization with locks, and safe shared-state patterns. This quiz helps reinforce essential knowledge for writing correct and efficient concurrent programs.

1. Understanding Race Conditions

   What is a race condition in the context of concurrent programming?

   1. A type of runtime error caused only by missing semicolons
   2. A feature that increases program speed by using multiple processors
   3. A situation where two threads update shared data at once, causing unpredictable results
   4. A method to prevent deadlocks in multi-threaded applications

2. Identifying the Role of Locks

   Why are locks often used when multiple threads access shared variables?

   1. To close all unused files automatically
   2. To intentionally slow down the program
   3. To ensure that only one thread updates the shared variable at a time
   4. To limit the memory usage in the application

3. Safe Shared State Pattern

   Which of the following describes a safe way to share data between threads?

   1. Protecting the shared data using a lock during both read and write operations
   2. Using a typo variable to store all shared data
   3. Allowing unlimited threads to read and write without any synchronization
   4. Relying on the operating system to handle all synchronization

4. Recognizing Data Races

   If two threads simultaneously increment the same integer variable without synchronization, what problem is most likely to occur?

   1. Guaranteed even number results
   2. Increased program readability
   3. Single-threaded execution
   4. Data race leading to incorrect results

5. Using Atomic Operations

   Which operation ensures a variable is updated safely by multiple threads without using explicit locks?

   1. Atomic operation
   2. Anthomic process
   3. Static call
   4. Asynchronous function

6. Benefits of Synchronization

   How does proper synchronization affect the correctness of a concurrent program?

   1. It automatically finds all bugs
   2. It prevents unpredictable behaviors and ensures data consistency
   3. It eliminates syntax errors
   4. It always makes the program run faster

7. Identifying Shared Resources

   Which example best illustrates a shared resource in concurrent programming?

   1. An integer counter updated by several threads
   2. A local variable inside a single function
   3. A typo in a comment section
   4. A constant string that is never changed

8. Deadlocks and Locks

   What is a potential risk when using multiple locks for shared data in threads?

   1. Deadlock, where threads wait forever for each other to release locks
   2. Faster execution speed
   3. Automatic memory expansion
   4. Typographical errors in variable names

9. Read-Write Locks Usage

   Why might you use a read-write lock instead of a regular lock?

   1. To make all variables constant
   2. To increase the likelihood of race conditions
   3. To allow multiple threads to read shared data simultaneously while exclusive access is only required for writes
   4. To prevent any thread from ever updating shared data

10. Immutable Objects

    How do immutable objects contribute to safe concurrent programming?

    1. They eliminate the need for logical thinking
    2. They automatically create locks for every access
    3. They reduce all types of program errors
    4. They cannot be modified after creation, so they are always safe to share between threads