Operating System Programming Interview FAQs in C++

System programming in C involves many low-level operations, so questions in this area are often asked during the interview process. This article will cover some frequently asked questions in operating system programming interviews in C.

1. What is a system call?

System call is a service provided by the operating system, which allows user programs to obtain the underlying functions of the operating system. For example, low-level operations such as file reading and writing, process management, etc. can be implemented through system calls.

2. How to make system calls in C?

You can use the C system call library to make system calls, such as the Win API under Windows or the POSIX API under Linux. These libraries provide corresponding functions to call system calls.

3. What is a process?

A process refers to a running program. Each process has its own memory space and execution context. The operating system allocates certain resources to each process, such as CPU time, memory, etc., and provides a multi-process management mechanism.

4. How to create a process in C?

You can create a process using system calls provided by the operating system. For example, the CreateProcess function under Windows and the fork function under Linux can both be used to create processes.

5. What is a thread?

A thread is an execution process within a process. Each thread has its own execution context, but shares the memory space of the same process. Threads can share process resources, such as file handles, global variables, etc.

6. How to create a thread in C?

Threads can be created using system calls provided by the operating system. For example, the CreateThread function under Windows and the pthread_create function under Linux can both be used to create threads.

7. What is synchronization?

Synchronization refers to the coordination between multiple processes or threads to ensure that operations between them are executed in a certain order to avoid problems such as data competition.

8. How to perform synchronization operations in C?

You can use the synchronization mechanism provided by the operating system to perform synchronization operations, such as Mutex, Event, Semaphore, etc. under Windows, and semaphores under Linux, etc.

9. What is mutual exclusion?

Mutual exclusion means that only one process or thread can access a shared resource at the same time. When performing multi-threaded programming, mechanisms such as mutex locks need to be used to avoid problems such as data competition.

10. How to implement mutual exclusion operations?

You can use the mutex lock provided by the operating system to implement mutual exclusion operations. For example, Mutex under Windows and pthread_mutex_t under Linux, etc. Obtain the mutex lock before accessing the shared resource and release the mutex lock after the operation is completed.

The above are questions frequently encountered in operating system programming interviews in C, involving system calls, processes, threads, synchronization and mutual exclusion, etc. Mastering these knowledge points can help us better perform system programming, and at the same time, we can better respond to questions during the interview process.

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