Embedded operating systems

• Lightweight threads

  • basic locks
  • fast context-switches

• Input/output

  • API for talking to devices
  • buffering

• Interrupt handling (with I/O devices and user interface)

  • translate interrupts into events to be handled by user code
  • trigger new tasks to run (reactive)

• Real-time issues

  • guarantee task is called at a certain rate
  • guarantee an interrupt will be handled within a certain time
  • priority or deadline driven scheduling of tasks

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