I found the last paragraph of subsection 12.1.1 of the "Linux Application
Development" (3rd edition) contradicting my knowledge. Am I right that it is
not accurate, or do I missing something essential?
Trying to quote the paragraph without copying the entire subsection, I get:
Although nonblocking I/O allows us to switch easily between file descriptors,
it has a high price. If it was up to the polling processes then they would
constantly be running - never blocks. Which inflicts a heavy performance
penalty on the system as the OS can never put these processes to sleep (try
running 10 processes like the one that was discussed previously and see how it
affects system performance).
"the OS can never put these processes to sleep"? - Perhaps in the Windows
world, but with Linux/Unix?
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