Module: Parallel

Extended by:
ProcessorCount
Defined in:
lib/parallel.rb,
lib/parallel/version.rb,
lib/parallel/processor_count.rb

Defined Under Namespace

Modules: ProcessorCount Classes: Break, DeadWorker, ExceptionWrapper, ItemWrapper, Kill, Worker

Constant Summary collapse

Stop = 
Object.new
INTERRUPT_SIGNAL = 
:SIGINT
VERSION = 
Version = '1.3.2'

Class Method Summary collapse

Methods included from ProcessorCount

physical_processor_count, processor_count

Class Method Details

.each(array, options = {}, &block) ⇒ Object 



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# File 'lib/parallel.rb', line 150

def each(array, options={}, &block)
  map(array, options.merge(:preserve_results => false), &block)
  array
end

.each_with_index(array, options = {}, &block) ⇒ Object 



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# File 'lib/parallel.rb', line 155

def each_with_index(array, options={}, &block)
  each(array, options.merge(:with_index => true), &block)
end

.in_processes(options = {}, &block) ⇒ Object 



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# File 'lib/parallel.rb', line 144

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

.in_threads(options = {:count => 2}) ⇒ Object 



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# File 'lib/parallel.rb', line 127

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, options) { wait_for_threads(threads) }

  out
end

.map(array, options = {}, &block) ⇒ Object 



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# File 'lib/parallel.rb', line 159

def map(array, options = {}, &block)
  options[:mutex] = Mutex.new

  if RUBY_PLATFORM =~ /java/ and not options[:in_processes]
    method = :in_threads
    size = options[method] || processor_count
  elsif options[:in_threads]
    method = :in_threads
    size = options[method]
  else
    method = :in_processes
    if Process.respond_to?(:fork)
      size = options[method] || processor_count
    else
      $stderr.puts "Warning: Process.fork is not supported by this Ruby"
      size = 0
    end
  end

  items = ItemWrapper.new(array, options[:mutex])

  size = [items.producer? ? size : items.size, size].min

  options[:return_results] = (options[:preserve_results] != false || !!options[:finish])
  add_progress_bar!(items, options)

  if size == 0
    work_direct(items, options, &block)
  elsif method == :in_threads
    work_in_threads(items, options.merge(:count => size), &block)
  else
    work_in_processes(items, options.merge(:count => size), &block)
  end
end

.map_with_index(array, options = {}, &block) ⇒ Object 



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# File 'lib/parallel.rb', line 194

def map_with_index(array, options={}, &block)
  map(array, options.merge(:with_index => true), &block)
end