System Architecture

MaxRT wRTOS turns Windows into a Real-time operating system (RTOS). wRTOS extends, but does not modify, the Windows hardware abstraction layer (HAL) by adding a real-time subsystem (RTSS) to Windows that delivers deterministic, hard real-time performance. Except for its real-time handler, RTSS is conceptually like other Windows subsystems in that it supports its own execution environment and API.

wRTOS partitions symmetric multiprocessing (SMP) system resources (processors/cores, memory, I/O devices, etc.) between Windows and RTSS, and dedicates real-time activities on RTSS resources. Windows and RTSS processors/cores execute simultaneously and communicate through service request interrupts (SRI).

The HAL extension maintains interrupt isolation between RTSS and Windows while providing inter-processors interrupt (IPI) communication between the two. The RTSS schedules its tasks to execute on separate processors, without any interference from Windows or Windows processes, but still allows for communication with Windows processes (RTAPI) and drivers (RTKAPI) through standard inter-process communication (IPC) and shared memory.

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