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  • Process Synchronization MCQs | Mutex & Semaphores | Suraku

Q: 1 The most common technique used for protecting a critical section in Linux is:

  1. Critical lock protocol

  2. Spinlock

  3. Critical Spinning

  4. Mutex interlocking

[ Option B ]

In Linux, a critical section is a part of the code that accesses shared resources, such as variables, files, or hardware, that must not be used by more than one process or thread at a time. To prevent data corruption or race conditions, Linux uses synchronization mechanisms to protect these critical sections. The most common technique used in the Linux kernel for this purpose is the spinlock.

A spinlock is a lightweight lock used in Linux to protect a critical section. It makes a process “spin” in a loop until it can enter the section, ensuring that only one process accesses the shared resource at a time without using heavy context switching.

Q: 2 Which type of semaphore can be used to provide mutual exclusion when mutex locks are not available?

  1. Counting semaphore

  2. Binary semaphore

  3. Timed semaphore

  4. Spinlock

[ Option B ]

Semaphore is a synchronization tool used to control access to shared resources in concurrent systems. There are two types of semaphores:

  1. Counting Semaphore: Can take any non-negative integer value; used for controlling access to multiple instances of a resource.
  2. Binary Semaphore: Can take only 0 or 1; used to provide mutual exclusion (like a lock) when only one process can access a resource at a time.

Mutex locks are specialized locks for mutual exclusion, but if they are not available, a binary semaphore can perform the same function.

Q: 3 A counting semaphore was initialized to 8. Then 12 P (wait) operations and 7 V (signal) operations were completed on this semaphore. The resulting value of semaphore is—

  1. 4

  2. 3

  3. 5

  4. 1

[ Option C ]

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