require_relative 'bench_helper'

module BenchGettimeofday
  module Posix
    extend FFI::Library
    ffi_lib FFI::Library::LIBC

    attach_function :gettimeofday, [ :buffer_out, :pointer ], :int
  end
  class Timeval < FFI::Struct
    layout :tv_sec, :ulong, :tv_nsec, :ulong
  end

  iter = ITER
  puts "Benchmark FFI gettimeofday(2) (nil, nil) performance, #{iter}x"

  10.times {
    puts Benchmark.measure {
      iter.times { Posix.gettimeofday(nil, nil) }
    }
  }
  puts "Benchmark FFI gettimeofday(2) (Timeval.alloc_out, nil) performance, #{iter}x"
  10.times {
    puts Benchmark.measure {
      iter.times { Posix.gettimeofday(Timeval.alloc_out, nil) }
    }
  }
  puts "Benchmark FFI gettimeofday(2) (Timeval.new(FFI::MemoryPointer.new), nil) performance, #{iter}x"
  10.times {
    puts Benchmark.measure {
      iter.times { Posix.gettimeofday(Timeval.new(FFI::MemoryPointer.new(Timeval)), nil) }
    }
  }
  puts "Benchmark FFI gettimeofday(2) (Timeval.new(FFI::Buffer.new), nil) performance, #{iter}x"
  10.times {
    puts Benchmark.measure {
      iter.times { Posix.gettimeofday(Timeval.new(FFI::Buffer.new(Timeval)), nil) }
    }
  }
  puts "Benchmark FFI gettimeofday(2) (pre allocated pointer, nil) performance, #{iter}x"
  10.times {
    t = Timeval.new FFI::MemoryPointer.new(Timeval)
    puts Benchmark.measure {
      iter.times { Posix.gettimeofday(t, nil) }
    }
  }
  puts "Benchmark Time.now performance, #{iter}x"
  10.times {
    puts Benchmark.measure {
      iter.times { Time.now }
    }
  }
end unless FFI::Platform.windows?