Two approaches to RTOS interrupt architectures: unified & segmented: Bill Lamie explains the challenge of supporting asynchronous access to internal RTOS data structures by interrupt routines and RTOS services

摘要

Like stand-alone systems, embedded applications running on top of real-time operating systems (RTOSes) require Interrupt Service Routines (ISRs) to handle interrupts generated by external events. External events can be caused by just about anything, from an asynchronous character arrival on a UART to a periodic timer interrupt. ISRs have the responsibility of acknowledging the hardware condition and provide the initial handling of data sent or received as required by the interrupt. An ISR often is responsible for providing the RTOS with information necessary to provide services to application threads. Examples include moving data into a buffer for processing, adding an entry to a queue for processing, setting a value to indicate that an event has occurred, and so on.