RadiSys Platform Engineer Lead Interview Questions and Answers

Scenario based programming questions?
General stuff about project and role which i have done

Q1. Memory leaks how do you find them and fix them?
Ans. 
Memory leaks can be found and fixed using various tools and techniques.
• Use memory profiling tools like Valgrind, LeakSanitizer, or AddressSanitizer to detect memory leaks.

• Analyze the code to identify the root cause of the memory leak and fix it.

• Ensure that all allocated memory is properly deallocated and avoid unnecessary memory allocations.

• Use smart pointers and garbage collection techniques to manage memory automatic...read more
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Q2. Mutex and semaphores?
Ans. 
Mutexes and semaphores are synchronization primitives used to manage access to shared resources in concurrent programming.
• Mutex (Mutual Exclusion) allows only one thread to access a resource at a time. Example: A printer shared by multiple users.

• Semaphore is a signaling mechanism that controls access to a resource with a set number of permits. Example: A pool of database connections.

• Mutex is binary (locked/unlocked), w...read more
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Q3. What is system call and how it works?
Ans. 
System call is a request made by a program to the operating system for performing a specific task.
• System call provides an interface between the user program and the operating system.

• It allows user programs to request services from the operating system.

• Examples of system calls include read, write, open, close, fork, exec, etc.

• System call is initiated by a software interrupt or trap instruction.

• The operating system perfo...read more
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Q4. Write an expression to clear a nth bit in a number?
Ans. 
Expression to clear nth bit in a number
• Use bitwise AND operator with the complement of 2 raised to the nth power

• Example: To clear 3rd bit of 1010, use 1010 & ~(1<<3) = 1000
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Q1. Explain about the project and roles handled by me?
Ans. 
Led multiple projects focusing on cloud infrastructure, CI/CD pipelines, and automation tools to enhance platform reliability and scalability.
• Designed and implemented a CI/CD pipeline using Jenkins and Docker, reducing deployment time by 40%.

• Managed a team of engineers to migrate legacy applications to AWS, improving system performance and reducing costs by 30%.

• Developed automation scripts using Python and Terraform fo...read more
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Q2. Write a program for Circular buffer implementation with producer and consumer scenario? Detect overflow and stop when detecting overflow and stop producer while consumer completes reading?
Ans. 
Circular buffer program with producer and consumer scenario, detecting overflow and stopping producer.
• Implement a circular buffer with a fixed size and two pointers for producer and consumer

• Use semaphores to synchronize access to the buffer

• When the buffer is full, stop the producer until the consumer reads from the buffer

• When the buffer is empty, stop the consumer until the producer writes to the buffer

• Use mutex locks ...read more
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Q3. Write a program to delete a node in the singly linked list?
Ans. 
Program to delete a node in a singly linked list
• Find the node to be deleted and its previous node

• Update the previous node's next pointer to skip the node to be deleted

• Free the memory occupied by the node to be deleted
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Q4. Explain secure boot flow in Intel and NXP?
Ans. 
Secure boot flow in Intel and NXP
• Intel uses a firmware-based approach to secure boot, where the firmware verifies the digital signature of the bootloader and OS kernel before loading them

• NXP uses a hardware-based approach to secure boot, where the boot ROM verifies the digital signature of the bootloader and OS kernel before loading them

• Both Intel and NXP use Trusted Platform Module (TPM) to store and verify the digita...read more
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