Parallel

# File lib/parallel.rb, line 80
def each(array, options={}, &block)
  map(array, options.merge(:preserve_results => false), &block)
  array
end

# File lib/parallel.rb, line 85
def each_with_index(array, options={}, &block)
  each(array, options.merge(:with_index => true), &block)
end

# File lib/parallel.rb, line 74
def in_processes(options = {}, &block)
  count, options = extract_count_from_options(options)
  count ||= processor_count
  map(0...count, options.merge(:in_processes => count), &block)
end

# File lib/parallel.rb, line 57
def in_threads(options={:count => 2})
  count, options = extract_count_from_options(options)

  out = []
  threads = []

  count.times do |i|
    threads[i] = Thread.new do
      out[i] = yield(i)
    end
  end

  kill_on_ctrl_c(threads) { wait_for_threads(threads) }

  out
end

# File lib/parallel.rb, line 89
def map(array, options = {}, &block)
  array = array.to_a # turn Range and other Enumerable-s into an Array

  if options[:in_threads]
    method = :in_threads
    size = options[method]
  else
    method = :in_processes
    size = options[method] || processor_count
  end
  size = [array.size, size].min

  return work_direct(array, options, &block) if size == 0

  if method == :in_threads
    work_in_threads(array, options.merge(:count => size), &block)
  else
    work_in_processes(array, options.merge(:count => size), &block)
  end
end

# File lib/parallel.rb, line 110
def map_with_index(array, options={}, &block)
  map(array, options.merge(:with_index => true), &block)
end

# File lib/parallel.rb, line 137
def physical_processor_count
  @physical_processor_count ||= begin
    ppc = case RbConfig::CONFIG['host_os']
    when /darwin1/, /freebsd/
      `sysctl -n hw.physicalcpu`.to_i
    when /linux/
      cores_per_physical = `grep cores /proc/cpuinfo`[/\d+/].to_i
      physicals = `grep 'physical id' /proc/cpuinfo |sort|uniq|wc -l`.to_i
      physicals * cores_per_physical
    when /mswin|mingw/
      require 'win32ole'
      wmi = WIN32OLE.connect("winmgmts://")
      cpu = wmi.ExecQuery("select NumberOfProcessors from Win32_Processor")
      cpu.to_enum.first.NumberOfLogicalProcessors
    else
      processor_count
    end
    # fall back to logical count if physical info is invalid
    ppc > 0 ? ppc : processor_count
  end
end

# File lib/parallel.rb, line 114
def processor_count
  @processor_count ||= case RbConfig::CONFIG['host_os']
  when /darwin9/
    `hwprefs cpu_count`.to_i
  when /darwin/
    (hwprefs_available? ? `hwprefs thread_count` : `sysctl -n hw.ncpu`).to_i
  when /linux|cygwin/
    `grep -c ^processor /proc/cpuinfo`.to_i
  when /(net|open|free)bsd/
    `sysctl -n hw.ncpu`.to_i
  when /mswin|mingw/
    require 'win32ole'
    wmi = WIN32OLE.connect("winmgmts://")
    cpu = wmi.ExecQuery("select NumberOfLogicalProcessors from Win32_Processor")
    cpu.to_enum.first.NumberOfLogicalProcessors
  when /solaris2/
    `psrinfo -p`.to_i # this is physical cpus afaik
  else
    $stderr.puts "Unknown architecture ( #{RbConfig::CONFIG["host_os"]} ) assuming one processor."
    1
  end
end