RTEMS has a robust set of APIs including but not limited to these modules listed below. For a complete description of the RTEMS API, see the online documentation.

• Chains
• Barriers
• Clocks
• Events
• Interrupts
• Message Queues
• Partitions
• Multiprocessing
• Regions
• Semaphores
• Mutexes
• Signals
• Tasks
• Timers