Hands-On RTOS with Microcontrollers

Using mutexes for access control

Since we implemented our driver with a stream buffer, if we are interested in having more than one task write to it, access to the stream buffer must be protected by a mutex. Most of the other FreeRTOS primitives, such as queues, don't have this limitation; they are safe to use across multiple tasks without any additional effort. Let's take a look at what would be required to extend VirtualCommDriver to make it usable by more than one task.