summaryrefslogtreecommitdiff
path: root/spec/ruby/core/process/clock_getres_spec.rb
blob: 90f775e764e1da699dc421e79177100caa552481 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
require_relative '../../spec_helper'

describe "Process.clock_getres" do
  # 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