Introduction to RTOS Part 3 - Task Scheduling | DigiKey

The RTOS scheduler decides which task to run on a recurring basis, and some tasks can interrupt and run before other tasks in a process known as “preemption.”

In this video, we examine how the FreeRTOS scheduler makes a decision at every tick (recurring timer interval) to determine which task to run for the remainder of the tick. With a single-core processor, this time-slicing allows tasks to run in a fashion that appears to be concurrent to the user.