FreeRTOS - A description of the FreeRTOS demo tasks that are common to all demos, and how to find a Free RTOS demo application in the FreeRTOS download
FreeRTOS Semaphore Example
Notifications - Inter-task Communication and Synchronization - Code Inside Out
Decrease RAM Footprint and Accelerate Execution with FreeRTOS Notifications - FreeRTOS
RTOS task scheduling
Add support for FreeRTOS task notification arrays (IDFGH-7819) · Issue #9349 · espressif/esp-idf · GitHub
RTOS task notification API functions
FreeRTOS basic | Harmony 3 driver and system service application examples for PIC32MK family
FreeRTOS Scheduler: Learn to Configure Scheduling Algorithm