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Working on the CXP starts on December 1, 2021. March 31, 2021 is our
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deadline for completing the specification process.
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# CXP Specifications
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## Common user API
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A common API available to applications is required for issuing
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requests to the real-time core. Specifying such interface does not
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preclude other APIs from co-existing in particular releases. However,
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use of this common API only guarantees portability across Xenomai
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releases starting from 3.3.
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The POSIX services available from _libcobalt_ in Xenomai 3.1 form the
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common API defined by the CXP. As a consequence, Xenomai 4 will
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provide two direct interfaces to the underlying EVL core: via the
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libevl API [1] which is readily available, and its own implementation
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of _libcobalt_ as part of a CXP compliance.
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```
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Applications
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libalchemy libevl libcobalt
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libcopperplate | |
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libcobalt | |
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v v v
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(Cobalt core) (EVL core)
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----------- ---------
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Xenomai 3.x Xenomai 4
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```
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[1] https://evlproject.org/core/user-api/
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Philippe Gerum <rpm@xenomai.org>