[Java] Thread Scheduler

Thread Scheduler

1. What is it?

- Thread scheduler is the part of the JVM that decides which thread should run

- Only one thread at a time can run in a single process

- The Thread scheduler mainly uses preemptive or time slicing scheduling to schedule the threads

2. Different between preemptive and time slicing

1) preemptive

- The highest priority task executes until it enters the waiting or dead states

- A higher priority task comes into existence

2) time slicing

- A task executes for a predefined slice of time and then reenters the pool of ready tasks

- The scheduler then determines which task should execute next, based on priority and other factors