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The "fscale" value, retrieved by sysctl() in BSD platforms, is used for
computing CPU percentages of the processes. To prevent a division by
zero, we should reject a zero "fscale" value. (A negative "fscale"
value will not make sense either.)
For DragonFlyBSD and FreeBSD, this would fall back to the hard-coded
default scale.
For NetBSD and OpenBSD, there is no hard-coded default value, so the
zero or negative "fscale" is now a fatal error.
Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
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The standard isnan() function is defined to never throw FP exceptions
even when the argument is a "signaling" NaN. This makes isnan() more
expensive than (x != x) expression unless the compiler flag
'-fno-signaling-nans' is given.
Introduce functions isNaN(), isNonnegative(), isPositive(),
sumPositiveValues() and compareRealNumbers(), and replace isnan() in
htop's codebase with the new functions. These functions utilize
isgreater() and isgreaterequal() comparisons, which do not throw FP
exceptions on "quiet" NaNs, which htop uses extensively.
With isnan() removed, there is no need to suppress the warning
'-Wno-c11-extensions' in FreeBSD. Remove the code from 'configure.ac'.
Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
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Part of a series of changes to get rid of errors and warnings.
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Move host-centric data to new derived <Platform>Machine classes,
separate from process-list-centric data.
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