science

RTX (operating system)

RTX (operating system) is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand RTX (operating system) rather than just read about it. In short: RTX / RTX64 are real-time operating systems (RTOS) by the firm IntervalZero. They are software extensions that convert Microsoft Windows operating system into a RTOS.

Key takeaways

RTX (operating system) belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect RTX (operating system) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of RTX (operating system) from memory before moving on to harder problems.

Reference excerpt

RTX / RTX64 are real-time operating systems (RTOS) by the firm IntervalZero. They are software extensions that convert Microsoft Windows operating system into a RTOS. It was the first Windows real-time solution on the market.

Overview RTX and RTX64 real-time software extensions to Windows combine the familiar user experience of Microsoft Windows (rich GUI, available drivers and software, ...) and the direct control of embedded hardware by providing hard real-time determinism and symmetric multiprocessing (SMP) abilities. The RTX / RTX64 extensions have followed the Windows architecture since Windows NT 3.5. Generally, RTX supports 32-bit Windows; RTX64 supports 64-bit Windows. The systems are used in different markets such as industrial automation, testbed and simulation, digital audio, digital video, aerospace military, medical devices, electrical grid, electricity generation, and other uses.

Technical details Hardware abstraction layer extension – RTX / RTX64 relies on a Windows hardware abstraction layer (HAL) extension to initialize the RTX-dedicated processors and to provide the real-time subsystem (RTSS) with high resolution timers (up to 1 microsecond). It also provides an interrupt isolation mechanism. Symmetric multiprocessing – Like Windows, RTX / RTX64 is based on a symmetric multiprocessing (SMP) architecture. Depending on the real-time needs, users can choose the number of processors to dedicate to RTX / RTX64 to run real-time processes. RTX can use up to 31 dedicated processors; RTX64 can use up to 63. Users can then scale real-time applications between the RTX / RTX64 dedicated processors. Interrupt management – RTX / RTX64 supports both line based and Message Signaled Interrupts (MSI/MSI-X). Interrupt service thread (IST) latencies are under 10 microseconds. Memory management – The deterministic memory pool allocated for RTX / RTX64 is taken from the system non-paged pool memory. For example, under Windows 7, the amount of non-paged pool is: for 32-bit, 1 GB to 2 GB of the random-access memory (RAM) depending on the configuration; for 64-bit, 75% up to a maximum of 128 GB. Scheduling – One scheduler is used across all real-time processors (SMP architecture). It uses priority-driven (128 real-time priorities) and pre-emptive algorithms to ensure critical thread context switches. Priority promotion mechanisms are provided to avoid priority inversion. Yields to threads of higher priority occur with sub-microsecond timing. Windows interaction – RTX / RTX64 provides separation from Windows. Windows processes cannot interfere with real-time applications. If Windows issues a STOP message or shutdown, real-time applications have the ability to continue running to shutdown safely. Communicating with Windows occurs via RTX / RTX64 providing common inter-process communication (IPC) mechanisms between real-time processes and Windows processes (user processes or kernel drivers). Synchronizing is done via events, mutexes and semaphores; data sharing via shared memory or socket communication. Real time application development – RTX / RTX64 application development is done from Microsoft Visual Studio in C or C++ using a windows-like application programming interface (API). RTX / RTX64 executables are .rtss and DLLs are .rtdll. Network communication – The RTX / RTX64 real-time TCP/IP stack (RT-TCP/IP) supports TCP, UDP, and IP for IPv4 and IPv6. RTX / RTX64 drivers for standard network interface controllers (NICs) are provided with the stack.

References

External links Official website

Illustrations

Worked examples

Example 1 — a first encounter with RTX (operating system)

Start with the simplest possible case. Write down what RTX (operating system) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to RTX (operating system) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about RTX (operating system) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of RTX (operating system)

In research: RTX (operating system) appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses RTX (operating system) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: RTX (operating system) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Embedded operating systems, Real-time operating systems, so understanding it makes those chapters shorter.
In everyday life: Look for RTX (operating system) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study RTX (operating system) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what RTX (operating system) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain RTX (operating system) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is RTX (operating system) in simple terms?

RTX / RTX64 are real-time operating systems (RTOS) by the firm IntervalZero. They are software extensions that convert Microsoft Windows operating system into a RTOS.

Why does RTX (operating system) matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study RTX (operating system)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on RTX (operating system).