Class: RbbtProcessQueue

Inherits:
Object
  • Object
show all
Defined in:
lib/rbbt/util/concurrency/processes.rb,
lib/rbbt/util/concurrency/processes/socket.rb,
lib/rbbt/util/concurrency/processes/worker.rb

Defined Under Namespace

Classes: RbbtProcessQueueWorker, RbbtProcessSocket

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(num_processes, cleanup = nil, join = nil, reswpan = nil, offset = false) ⇒ RbbtProcessQueue

Returns a new instance of RbbtProcessQueue.



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# File 'lib/rbbt/util/concurrency/processes.rb', line 7

def initialize(num_processes, cleanup = nil, join = nil, reswpan = nil, offset = false)
  @num_processes = num_processes
  @processes = []
  @cleanup = cleanup
  @join = join
  @respawn = reswpan
  @offset = offset
  @queue = RbbtProcessSocket.new
  @process_mutex = Mutex.new
end

Instance Attribute Details

#callback(&block) ⇒ Object

Returns the value of attribute callback.



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# File 'lib/rbbt/util/concurrency/processes.rb', line 18

def callback
  @callback
end

#callback_queue ⇒ Object

Returns the value of attribute callback_queue.



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# File 'lib/rbbt/util/concurrency/processes.rb', line 18

def callback_queue
  @callback_queue
end

#callback_thread ⇒ Object

Returns the value of attribute callback_thread.



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# File 'lib/rbbt/util/concurrency/processes.rb', line 18

def callback_thread
  @callback_thread
end

#cleanup ⇒ Object

Returns the value of attribute cleanup.



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# File 'lib/rbbt/util/concurrency/processes.rb', line 6

def cleanup
  @cleanup
end

#join ⇒ Object

Returns the value of attribute join.



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# File 'lib/rbbt/util/concurrency/processes.rb', line 6

def join
  @join
end

#num_processes ⇒ Object

Returns the value of attribute num_processes.



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# File 'lib/rbbt/util/concurrency/processes.rb', line 6

def num_processes
  @num_processes
end

#offset ⇒ Object

Returns the value of attribute offset.



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# File 'lib/rbbt/util/concurrency/processes.rb', line 6

def offset
  @offset
end

#process_monitor ⇒ Object

Returns the value of attribute process_monitor.



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# File 'lib/rbbt/util/concurrency/processes.rb', line 6

def process_monitor
  @process_monitor
end

#processes ⇒ Object

Returns the value of attribute processes.



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# File 'lib/rbbt/util/concurrency/processes.rb', line 6

def processes
  @processes
end

#queue ⇒ Object

Returns the value of attribute queue.



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# File 'lib/rbbt/util/concurrency/processes.rb', line 6

def queue
  @queue
end

#reswpan ⇒ Object

Returns the value of attribute reswpan.



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# File 'lib/rbbt/util/concurrency/processes.rb', line 6

def reswpan
  @reswpan
end

Class Method Details

.each(list, num = 3, &block) ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes.rb', line 309

def self.each(list, num = 3, &block)
  q = RbbtProcessQueue.new num
  q.init(&block)
  list.each do |elem| q.process elem end
  q.join
end

Instance Method Details

#_abort ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes.rb', line 271

def _abort
  begin
    Process.kill 20, @master_pid
  rescue Errno::ECHILD, Errno::ESRCH
    Log.debug "Cannot kill #{@master_pid}: #{$!.message}"
  end

  begin
    _join
  rescue ProcessFailed
  end
end

#_join ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes.rb', line 229

def _join
  error = true
  begin
    pid, status = Process.waitpid2 @master_pid
    error = false if status.success?
    raise ProcessFailed if error
  rescue Errno::ECHILD
  rescue Aborted
    Log.error "Aborted joining queue"
    raise $!
  rescue Exception
    Log.error "Exception joining queue: #{$!.message}"
    raise $!
  ensure
    if @join
      if @join.arity == 1
        @join.call(error) 
      else
        @join.call
      end
    end
  end

end

#abort ⇒ Object

Raises:



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# File 'lib/rbbt/util/concurrency/processes.rb', line 284

def abort
  _abort
  (@callback_thread.raise(Aborted.new); @callback_thread.join) if @callback_thread and @callback_thread.alive?
  raise Aborted.new
end

#add_process ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes.rb', line 208

def add_process
  Process.kill :USR1, @master_pid
end

#clean ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes.rb', line 290

def clean
  begin
    self.abort if Misc.pid_exists?(@master_pid)

  ensure
    @queue.clean if @queue
    @callback_queue.clean if @callback_queue
  end
end

#close_callback ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes.rb', line 216

def close_callback
  return unless @callback_thread.alive?
  begin
    t = Thread.new do
      @callback_queue.push ClosedStream.new
    end
  rescue Exception
    Log.warn "Error closing callback: #{$!.message}"
  end
  @callback_thread.join  #if @callback_thread.alive?
  t.join
end

#init(&block) ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes.rb', line 62

def init(&block)
  @init_block = block

  @master_pid = Process.fork do
    @close_up = false
    Signal.trap(:INT) do
      @close_up = true
      Misc.insist([0,0.01,0.1,0.2,0.5]) do
        raise TryAgain unless @manager_thread
        if @manager_thread.alive?
          raise "Manager thread for #{Process.pid} Not working yet" unless @manager_thread["working"]
          @manager_thread.raise TryAgain
        end
      end
    end

    if @callback_queue
      Misc.purge_pipes(@queue.swrite,@queue.sread,@callback_queue.swrite, @callback_queue.sread) 
    else
      Misc.purge_pipes(@queue.swrite,@queue.sread) 
    end

    @total = num_processes
    @count = 0
    @processes = []

    @manager_thread = Thread.new do
      begin
      while true 
        begin
          Thread.current["working"] = true
          if @close_up
            Log.debug "Closing up process queue #{Process.pid}"
            @count = 0
            Thread.new do
              Log.debug "Pushing closed stream #{Process.pid}"
              while true
                @queue.push ClosedStream.new unless @queue.cleaned 
              end unless @processes.empty?
            end
            @close_up = false
          end

          begin
            sleep 3
          rescue TryAgain
          end

          raise TryAgain if @close_up

          @process_mutex.synchronize do
            while @count > 0
              @count -= 1
              @total += 1
              @processes << RbbtProcessQueueWorker.new(@queue, @callback_queue, @cleanup, @respawn, @offset, &@init_block)
              Log.warn "Added process #{@processes.last.pid} to #{Process.pid} (#{@processes.length})"
            end

            while @count < 0
              @count += 1
              next unless @processes.length > 1
              first = @processes.shift
              first.stop
              Log.warn "Removed process #{first.pid} from #{Process.pid} (#{@processes.length})"
            end
          end
        rescue TryAgain
          retry
        rescue Aborted
          Log.low "Aborting manager thread #{Process.pid}"
          raise Aborted
        rescue Exception
          Log.exception $!
          raise Exception
        end
      end
      rescue Exception
        Log.exception $!
        raise $!
      end
    end

    Signal.trap(:USR1) do
      @count += 1
      @manager_thread.raise TryAgain
    end

    Signal.trap(:USR2) do
      @count -= 1
      @manager_thread.raise TryAgain
    end


    @callback_queue.close_read if @callback_queue

    num_processes.times do |i|
      @process_mutex.synchronize do
        @processes << RbbtProcessQueueWorker.new(@queue, @callback_queue, @cleanup, @respawn, @offset, &@init_block)
      end
    end

    @monitor_thread = Thread.new do
      begin
        while @processes.any?
          @processes[0].join 
          @processes.shift
        end
      rescue Aborted
        Log.warn "Aborting process monitor"
        @processes.each{|p| p.abort_and_join}
        @processes.clear

        @callback_thread.kill if @callback_thread && @callback_thread.alive?
        @manager_thread.kill if @manager_thread.alive?
      rescue Exception
        Log.warn "Process monitor exception: #{$!.message}"
        @processes.each{|p| p.abort_and_join}
        @processes.clear

        @callback_thread.kill if @callback_thread && @callback_thread.alive?
        @manager_thread.kill if @manager_thread.alive?
      end
    end

    Signal.trap(20) do
      begin
        @monitor_thread.raise Aborted.new
      rescue Exception
        Log.exception $!
      end
    end

    begin
      @monitor_thread.join
    rescue Exception
      Log.exception $!
    end

    Kernel.exit! 0
  end

  Log.info "Cpu process (#{num_processes}) started with master: #{@master_pid}"
  
  @queue.close_read
end

#process(*e) ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes.rb', line 301

def process(*e)
  begin
    @queue.push e
  rescue Errno::EPIPE
    raise Aborted
  end
end

#remove_process ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes.rb', line 212

def remove_process
  Process.kill :USR2, @master_pid
end