San Diego, CA, January 28, 2025 BUSINESS WIRE — RTOSX, a global leader in high-performance real-time operating systems and middleware, today announced the off-the-shelf functional safety certification of RTOSX KERNEL — the industrial–grade alternative to Eclipse ThreadX. Developers using RTOSX KERNEL leverage the RTOS certification artifacts to save time and money during application certification for safety-certified devices in the automotive, industrial, and medical industries. The RTOSX KERNEL certifications were performed by SGS-TÜV Saar, the leading accredited, independent company for testing, auditing, verifying, and certifying embedded software for safety-related systems. The RTOSX KERNEL achieved functional safety certification to the highest levels of the IEC 61508, IEC 62304, ISO 26262, and EN 50128 functional safety standards, specifically IEC 61508 SIL 4, IEC 62304 Class C, ISO 26262 ASIL D, and EN 50128 SW-SIL 4.
@Px5Rtos announces off-the-shelf functional safety certification of RTOSX KERNEL. Performed by SGS-TÜV Saar, the certification accelerates functional safety standards compliance & provides an industrial-grade, certifiable alternative to #EclipseThreadX.
RTOSX KERNEL is the industrial-grade alternative to Eclipse ThreadX. Derived from the latest Eclipse ThreadX release, it is completely refactored and infused with unique technology from PX5 RTOS, including Pointer/Data Verification (PDV) and central error handling. RTOSX KERNEL is 100% API and functionally compatible with standard ThreadX, fully preserving its small memory footprint, full multithreading, and hard real-time functionality. Existing ThreadX-based applications require no modification when moving to RTOSX KERNEL. The RTOSX KERNEL includes full development tool support, source code, and royalty-free licensing.
This certified version offers developers a stable, reliable foundation built to industry best practices to support improved product reliability, security, quality, and time to market for both safety-critical and non-safety-critical devices.
| RTOSX KERNEL | Eclipse ThreadX | |
|---|---|---|
| ThreadX Compatible | 100% | 100% |
| Safety-Certified Version | Version 7.0.0 (2025) | Version 6.1.1 (2020) |
| Source Code Distribution | Refactored, simplified 2 file distribution | Over 100 files; developer must pull together |
| Cross Function Optimization |  |
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| Advanced Features | ||
| Pointer/Data Verification [1] | (from PX5 RTOS) |
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| Central Error Handling | (from PX5 RTOS) |
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| Documentation | ||
| ThreadX User Guide | PDF User Guide | On-line docs on GitHub |
| Processor/Tool User Guide | |
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| Quickstart Guide | |
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| Programmer’s Reference Card | |
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| Support | ||
| Support & Maintenance | Professionally maintained and supported | Community |
| IP Protection | Full Indemnification | |
[1] Optional Pointer/Data Verification (PDV) checks integrity at run-time of RTOS global data area, object control blocks, allocated memory, and thread stacks.
“Functional safety is top of mind for developers of safety-critical devices, and it also impacts security, since a device with functional safety vulnerabilities is easier to compromise,” said William Lamie, CEO of RTOSX. “RTOSX’s functional safety certification gives all embedded developers confidence in their application code’s safety, security and certifiability without compromising core ThreadX benefits.“
RTOSX – a subsidiary of PX5 - creates industrial-grade alternatives to the open-source Eclipse ThreadX and associated middleware components FileX, NetX Duo, and USBX. The RTOSX team comprises the original authors of these components, formerly with Express Logic. For designs not requiring the ThreadX API, the PX5 RTOS is the best choice. More information on the PX5 RTOS can be found here: px5rtos.com.
Headquartered in San Diego, CA, all RTOSX products include complete source code and are free of run-time royalties. For information, please visit rtosx.com, or Email
Kelly Wanlass
HCI Marketing and Communications, Inc.