Real Time Operating System (RTOS): Embedded Database

 These are designed to control an embedded system, and to deliver the real time responsiveness and determinism required by the controlled device. Applications run under the control of the RTOS, and their allocated CPU time is scheduled by the RTOS kernel. An embedded provides facilities which, if used properly, guarantee deadlines can be met generally (soft real-time) or deterministically (hard real-time).

In modern systems, a RTOS consists higher-level functions such as device management (USB, UART, Ethernet, LCD etc), file systems, protocol stacks (CAN, TCP/IP, HTTP etc) and graphical user interfaces (GUI). Such applications in embedded systems include point-of-sale (PoS) terminals, household appliance controllers, medical monitoring equipment, and automotive controls.

Kalinsky begins by offering a comparison of general-purpose operating systems. He then covers real-time kernel services including task scheduling; fixed-time task switching; inter task communication and synchronization; determinism and high-speed message passing; and, dynamic memory allocation.

Task States are

Executing: running on the CPU

Ready: could run but another one is using the CPU

Blocked: waits for something (I/O, signal, resource, etc.)

Dormant: created but not executing yet

Terminated: no longer active

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