Embedded C / RTOS Deep Dive

Question

Qualcomm's deep-dive round goes below the algorithm into systems fundamentals. Embedded-systems fundamentals dominate this round.

What this round covers

• volatile and const correctness; when volatile matters
• malloc vs calloc vs realloc; fragmentation
• ISR constraints; what you cannot do in an interrupt handler
• Function pointers and callbacks; spinlocks vs mutex on constrained hardware

Tips

Build understanding from first principles — these companies prefer engineers who can derive behavior, not recite it. Bring real low-level debugging stories.