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Which kernel allows the multiple tasks which use the same routine?

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Which kernel allows the multiple tasks which use the same routine?

(a) pREC+ runtime support

(b) pSOS+m

(c) pSOS+

(d) pSOS+ kernel

This question was posed to me in final exam.

My question comes from Commercial Operating Systems in chapter Real Time Operating systems of Embedded Systems

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The correct option is (a) pREC+ runtime support

Explanation: The pREC+ runtime support kernel’s routines are reentrant that allows the multiple tasks to use the same routine simultaneously.

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