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require_relative '../../spec_helper'
describe "Process.clock_gettime" do
platform_is_not :windows, :solaris do
Process.constants.select { |c|
c.to_s.start_with?('CLOCK_') &&
# These require CAP_WAKE_ALARM and are not documented in clock_gettime(),
# they return EINVAL if the permission is not granted.
c != :CLOCK_BOOTTIME_ALARM &&
c != :CLOCK_REALTIME_ALARM
}.each do |c|
it "can be called with Process::#{c}" do
value = Process.const_get(c)
Process.clock_gettime(value).should be_an_instance_of(Float)
end
end
end
describe 'time units' do
it 'handles a fixed set of time units' do
[:nanosecond, :microsecond, :millisecond, :second].each do |unit|
Process.clock_gettime(Process::CLOCK_MONOTONIC, unit).should be_kind_of(Integer)
end
[:float_microsecond, :float_millisecond, :float_second].each do |unit|
Process.clock_gettime(Process::CLOCK_MONOTONIC, unit).should be_an_instance_of(Float)
end
end
it 'raises an ArgumentError for an invalid time unit' do
lambda { Process.clock_gettime(Process::CLOCK_MONOTONIC, :bad) }.should raise_error(ArgumentError)
end
it 'defaults to :float_second' do
t1 = Process.clock_gettime(Process::CLOCK_MONOTONIC)
t2 = Process.clock_gettime(Process::CLOCK_MONOTONIC, :float_second)
t1.should be_an_instance_of(Float)
t2.should be_close(t1, 2.0) # 2.0 is chosen arbitrarily to allow for time skew without admitting failure cases, which would be off by an order of magnitude.
end
it 'uses the default time unit (:float_second) when passed nil' do
t1 = Process.clock_gettime(Process::CLOCK_MONOTONIC, nil)
t2 = Process.clock_gettime(Process::CLOCK_MONOTONIC, :float_second)
t1.should be_an_instance_of(Float)
t2.should be_close(t1, 2.0) # 2.0 is chosen arbitrarily to allow for time skew without admitting failure cases, which would be off by an order of magnitude.
end
end
end
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