C++ is a low-level language comparable to C, being only slightly
higher-level than assembler or machine language. So, there is no
technical reason why parts of an OS kernel (even the z/OS nucleus) could
not be written in C++.
It is well-documented that when IBM transitioned the AS/400 from CISC
(IMPI) to RISC (PowerPC) hardware, they re-wrote the IMPI HLIC and VLIC
(Horizontal and Vertical Licensed Internal Code) in C++ for the PowerPC
RISC, to create what is now called "SLIC" (System :Licensed Internal
Code). See:
http://www.research.ibm.com/journal/sj/372/schmidt.html
It is possible that some parts of z/OS might now be written in C++, but
I expect that the nucleus is fairly stable and so probably remains in
PL/X or BAL.
> Ted MacNEIL wrote:
Now, does anybody know if C or C++ is used in the "kernal" of z/OS?
When I first took a C++ course, I was told that it should not be used to write
operating systems (too slow).
But, I would like to know if C is used in the 'kernal'.
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