Now, let's see how we can avoid race conditions between the process context and the interrupt context. However, this time we must pay more attention than before because, this time, we must implement a locking mechanism to protect shared data between the process context and the interrupt context. However, we must also provide a syncing mechanism between the reading process and the driver too, to allow the reading process to proceed in its action if some data to be read is present within the driver's queues.
To explain this problem, it is better to do a practical example. Let's suppose we have a peripheral that generates data for reading processes. To signal that new data has arrived, the peripheral sends an interrupt to the CPU, so we can imagine implementing our driver by using a circular buffer where the interrupt...
