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Check the precision of getrusage at runtime

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Nobuyoshi Nakada 2023-04-23 11:54:31 +09:00
parent c5529aa5fc
commit dafbaabc04
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1 changed files with 11 additions and 1 deletions
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12
spec/ruby/core/process/times_spec.rb
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@ -17,8 +17,18 @@ describe "Process.times" do
end
end
# TODO: The precision of `getrusage` depends on platforms (OpenBSD
# seems not supporting under-milliseconds in fact); this example is
# very questionable as an example of Ruby, and it just repeats the
# guard condition.
guard -> do
Process.clock_gettime(:GETRUSAGE_BASED_CLOCK_PROCESS_CPUTIME_ID)
1000.times.any? do
# If getrusage has precision beyond milliseconds, there will be
# very likely at least one non-zero microsecond results when
# repeating enough.
time = Process.clock_gettime(:GETRUSAGE_BASED_CLOCK_PROCESS_CPUTIME_ID)
not ('%.6f' % time).end_with?('000')
end
rescue Errno::EINVAL
false
end do