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by wolrah 3628 days ago
Windows CE can be a RTOS. XP is not.

https://msdn.microsoft.com/en-us/library/ms838350(v=winembed...

"Is Windows XP Embedded a real-time OS? Windows XP Embedded satisfies the vast majority of performance requirements. However, if you require a more powerful real-time support for your Windows XP Embedded OS, you can utilize one of the real-time extensions that are available through third-party vendors."

There are apparently third-party real-time extensions available, but if that counts then the existence of CONFIG_PREEMPT_RT makes Linux a RTOS and I think that'd be a pretty silly claim too.