require File.expand_path('../../../spec_helper', __FILE__)

describe "Process.setpriority" do
  platform_is_not :windows do
    it "sets the scheduling priority for a specified process" do
      priority = Process.getpriority(Process::PRIO_PROCESS, 0)

      out = ruby_exe(fixture(__FILE__, "setpriority.rb"), args: "process")
      out = out.lines.map { |l| Integer(l) }
      pr = out[0]
      out.should == [pr, 0, pr+1]

      Process.getpriority(Process::PRIO_PROCESS, 0).should == priority
    end

    # Darwin and FreeBSD don't seem to handle these at all, getting all out of
    # whack with either permission errors or just the wrong value
    platform_is_not :darwin, :freebsd do
      it "sets the scheduling priority for a specified process group" do
        priority = Process.getpriority(Process::PRIO_PGRP, 0)

        out = ruby_exe(fixture(__FILE__, "setpriority.rb"), args: "group")
        out = out.lines.map { |l| Integer(l) }
        pr = out[0]
        out.should == [pr, 0, pr+1]

        Process.getpriority(Process::PRIO_PGRP, 0).should == priority
      end
    end

    as_superuser do
      it "sets the scheduling priority for a specified user" do
        p = Process.getpriority(Process::PRIO_USER, 0)
        Process.setpriority(Process::PRIO_USER, 0, p + 1).should == 0
        Process.getpriority(Process::PRIO_USER, 0).should == (p + 1)
        Process.setpriority(Process::PRIO_USER, 0, p).should == 0
      end
    end
  end

end