TECHNICAL INTERVIEW QUESTION

TECHNICAL INTERVIEW QUESTION


TELL US ABOUT MUTEX?

MUTEX-  MUTUAL EXCLUSION LOCK IS A LOCK WHICH PROTECTS ACCESS TO SHARED DATA RESOURCE.

• THREADS CAN CREATE AND INITIALIZE A MUTEX TO BE USED LATER.

• BEFORE ENTERING CRITICAL REGION THE MUTEX IS LOCKED IT IS UNLOCKED AFTER EXITING THE CRITICAL REGION IF ANY THREAD TRIES TO LOCK THE MUTEX DURING THIS TIME .

WHAT DO YOU MEAN BY ZOMBIE PROCESS?

• THESE ARE DEAD PROCESSES WHICH ARE NOT YET REMOVED FROM THE PROCESS TABLE.
• IT HAPPEN WHEN THE PARENTS PROCESS HAS TERMINATED WHILE THE CHILD PROCESS IS STILL RUNNING THIS CHILD PROCESS NOW STAYS AS A ZOMBIE.

WHAT IS CRITICAL SECTION?

IT IS SECTION OF CODE WHICH CAN BE EXECUTED BY ONE PROCESS AT A TIME.