Table of Contents 1 Concurrency Why do threads block on I/O? Threads block on I/O (that is enters the waiting state) so that other threads may execute while the I/O Operation is performed. What is round-robin algo/Time slicing? Round-robin (RR) is one of the simplest scheduling algorithms for processes in an operating system. As the term is generally used, time slices are assigned to each process in equal portions and in circular order, handling all processes without priority. It is starvation free algo. In order to schedule processes fairly, a round-robin scheduler generally employs time-sharing, giving each job a time slot or quantum[1] (its allowance of CPU time), and interrupting the job if it is not completed by then. The job is resumed next time a time slot is assigned to that process. What is Preemptive scheduling Preemptive scheduling enables the highest priority task execution until waiting or dead states entered. It also executes, until a higher priority task enters. What is daemon thread A daemon thread is a thread, that does not prevent the JVM from exiting when the program finishes but the thread is still running. An example for a daemon thread is the garbage collection. You can use the setDaemon() method to change the Thread daemon properties. How interrupt works in Java? An interrupt is an indication to a thread that it should stop what it is doing and do something else. It's up to the programmer to decide exactly how a thread responds to an interrupt, ...
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