Hi list,
I just found this web site here which claims to develop POSIX-compliant realtime OS providing full support for pthread, signal, and IPC (Inter Process Communication) on the system level.

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Purnateja.D.Ghat
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ಸಿರಿಗನ್ನಡಂ ಗೆಲ್ಗೆ
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www.purnateja.devadutta.net
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