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require_relative '../../spec_helper'
require_relative 'fixtures/clocks'
describe "Process.clock_getres" do
# clock_getres() seems completely buggy on FreeBSD:
# https://rubyci.org/logs/rubyci.s3.amazonaws.com/freebsd11zfs/ruby-trunk/log/20190428T093003Z.fail.html.gz
platform_is_not :freebsd, :openbsd, :android do
# NOTE: Look at fixtures/clocks.rb for clock and OS-specific exclusions
ProcessSpecs.clock_constants_for_resolution_checks.each do |name, value|
it "matches the clock in practice for Process::#{name}" do
times = 10_000.times.map { Process.clock_gettime(value, :nanosecond) }
reported = Process.clock_getres(value, :nanosecond)
# The clock should not be more accurate than reported (times should be
# a multiple of reported precision.)
times.select { |t| t % reported > 0 }.should be_empty
# We're assuming precision is a multiple of ten - it may or may not
# be an incompatibility if it isn't but we'd like to notice this,
# and the spec following these wouldn't work if it isn't.
reported.should > 0
(reported == 1 || reported % 10 == 0).should be_true
# The clock should not be less accurate than reported (times should
# not all be a multiple of the next precision up, assuming precisions
# are multiples of ten.)
times.select { |t| t % (reported * 10) == 0 }.size.should_not == times.size
end
end
end
# These are documented
it "with :GETTIMEOFDAY_BASED_CLOCK_REALTIME reports 1 microsecond" do
Process.clock_getres(:GETTIMEOFDAY_BASED_CLOCK_REALTIME, :nanosecond).should == 1_000
end
it "with :TIME_BASED_CLOCK_REALTIME reports 1 second" do
Process.clock_getres(:TIME_BASED_CLOCK_REALTIME, :nanosecond).should == 1_000_000_000
end
platform_is_not :windows do
it "with :GETRUSAGE_BASED_CLOCK_PROCESS_CPUTIME_ID reports 1 microsecond" do
Process.clock_getres(:GETRUSAGE_BASED_CLOCK_PROCESS_CPUTIME_ID, :nanosecond).should == 1_000
end
end
# These are observed
platform_is_not :solaris, :aix, :openbsd do
it "with Process::CLOCK_REALTIME reports at least 1 microsecond" do
Process.clock_getres(Process::CLOCK_REALTIME, :nanosecond).should <= 1_000
end
end
platform_is_not :aix, :openbsd do
it "with Process::CLOCK_MONOTONIC reports at least 1 microsecond" do
Process.clock_getres(Process::CLOCK_MONOTONIC, :nanosecond).should <= 1_000
end
end
end
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