class Shell::ProcessController

# File lib/shell/process-controller.rb, line 38
def activate(pc)
  process_controllers_exclusive do
    @ProcessControllers[pc] ||= 0
    @ProcessControllers[pc] += 1
  end
end

# File lib/shell/process-controller.rb, line 32
def active_process_controllers
  process_controllers_exclusive do
    @ProcessControllers.dup
  end
end

# File lib/shell/process-controller.rb, line 64
def block_output_synchronize(&b)
  @BlockOutputMonitor.synchronize(&b)
end

# File lib/shell/process-controller.rb, line 56
def each_active_object
  process_controllers_exclusive do
    for ref in @ProcessControllers.keys
      yield ref
    end
  end
end

# File lib/shell/process-controller.rb, line 45
def inactivate(pc)
  process_controllers_exclusive do
    if @ProcessControllers[pc]
      if (@ProcessControllers[pc] -= 1) == 0
        @ProcessControllers.delete(pc)
        @ProcessControllersCV.signal
      end
    end
  end
end

# File lib/shell/process-controller.rb, line 93
def initialize(shell)
  @shell = shell
  @waiting_jobs = []
  @active_jobs = []
  @jobs_sync = Sync.new

  @job_monitor = Mutex.new
  @job_condition = ConditionVariable.new
end

# File lib/shell/process-controller.rb, line 68
def wait_to_finish_all_process_controllers
  process_controllers_exclusive do
    while !@ProcessControllers.empty?
      Shell::notify("Process finishing, but active shell exists",
                    "You can use Shell#transact or Shell#check_point for more safe execution.")
      if Shell.debug?
        for pc in @ProcessControllers.keys
          Shell::notify(" Not finished jobs in "+pc.shell.to_s)
          for com in pc.jobs
            com.notify("  Jobs: %id")
          end
        end
      end
      @ProcessControllersCV.wait(@ProcessControllersMonitor)
    end
  end
end

# File lib/shell/process-controller.rb, line 182
def active_job?(job)
  @jobs_sync.synchronize(:SH) do
    @active_jobs.include?(job)
  end
end

# File lib/shell/process-controller.rb, line 114
def active_jobs
  @active_jobs
end

# File lib/shell/process-controller.rb, line 128
def active_jobs_exist?
  @jobs_sync.synchronize(:SH) do
    @active_jobs.empty?
  end
end

# File lib/shell/process-controller.rb, line 141
def add_schedule(command)
  @jobs_sync.synchronize(:EX) do
    ProcessController.activate(self)
    if @active_jobs.empty?
      start_job command
    else
      @waiting_jobs.push(command)
    end
  end
end

# File lib/shell/process-controller.rb, line 105
def jobs
  jobs = []
  @jobs_sync.synchronize(:SH) do
    jobs.concat @waiting_jobs
    jobs.concat @active_jobs
  end
  jobs
end

# File lib/shell/process-controller.rb, line 122
def jobs_exist?
  @jobs_sync.synchronize(:SH) do
    @active_jobs.empty? or @waiting_jobs.empty?
  end
end

# File lib/shell/process-controller.rb, line 201
def kill_job(sig, command)
  @jobs_sync.synchronize(:EX) do
    if @waiting_jobs.delete command
      ProcessController.inactivate(self)
      return
    elsif @active_jobs.include?(command)
      begin
        r = command.kill(sig)
        ProcessController.inactivate(self)
      rescue
        print "Shell: Warn: $!\n" if @shell.verbose?
        return nil
      end
      @active_jobs.delete command
      r
    end
  end
end

# File lib/shell/process-controller.rb, line 237
    def sfork(command)
      pipe_me_in, pipe_peer_out = IO.pipe
      pipe_peer_in, pipe_me_out = IO.pipe


      pid = nil
      pid_mutex = Mutex.new
      pid_cv = ConditionVariable.new

      Thread.start do
        ProcessController.block_output_synchronize do
          STDOUT.flush
          ProcessController.each_active_object do |pc|
            for jobs in pc.active_jobs
              jobs.flush
            end
          end

          pid = fork {
            Thread.list.each do |th|
#             th.kill unless [Thread.main, Thread.current].include?(th)
              th.kill unless Thread.current == th
            end

            STDIN.reopen(pipe_peer_in)
            STDOUT.reopen(pipe_peer_out)

            ObjectSpace.each_object(IO) do |io|
              if ![STDIN, STDOUT, STDERR].include?(io)
                io.close unless io.closed?
              end
            end

            yield
          }
        end
        pid_cv.signal

        pipe_peer_in.close
        pipe_peer_out.close
        command.notify "job(%name:##{pid}) start", @shell.debug?

        begin
          _pid = nil
          command.notify("job(%id) start to waiting finish.", @shell.debug?)
          _pid = Process.waitpid(pid, nil)
        rescue Errno::ECHILD
          command.notify "warn: job(%id) was done already waitpid."
          _pid = true
          #     rescue
          #       STDERR.puts $!
        ensure
          command.notify("Job(%id): Wait to finish when Process finished.", @shell.debug?)
          # when the process ends, wait until the command terminates
          if USING_AT_EXIT_WHEN_PROCESS_EXIT or _pid
          else
            command.notify("notice: Process finishing...",
                           "wait for Job[%id] to finish.",
                           "You can use Shell#transact or Shell#check_point for more safe execution.")
            redo
          end

#         command.notify "job(%id) pre-pre-finish.", @shell.debug?
          @job_monitor.synchronize do
#           command.notify "job(%id) pre-finish.", @shell.debug?
            terminate_job(command)
#           command.notify "job(%id) pre-finish2.", @shell.debug?
            @job_condition.signal
            command.notify "job(%id) finish.", @shell.debug?
          end
        end
      end

      pid_mutex.synchronize do
        while !pid
          pid_cv.wait(pid_mutex)
        end
      end

      return pid, pipe_me_in, pipe_me_out
    end

# File lib/shell/process-controller.rb, line 153
    def start_job(command = nil)
      @jobs_sync.synchronize(:EX) do
        if command
          return if command.active?
          @waiting_jobs.delete command
        else
          command = @waiting_jobs.shift
#         command.notify "job(%id) pre-start.", @shell.debug?

          return unless command
        end
        @active_jobs.push command
        command.start
#       command.notify "job(%id) post-start.", @shell.debug?

        # start all jobs that input from the job
        for job in @waiting_jobs.dup
          start_job(job) if job.input == command
        end
#       command.notify "job(%id) post2-start.", @shell.debug?
      end
    end

# File lib/shell/process-controller.rb, line 189
def terminate_job(command)
  @jobs_sync.synchronize(:EX) do
    @active_jobs.delete command
    ProcessController.inactivate(self)
    if @active_jobs.empty?
      command.notify("start_job in terminate_job(%id)", Shell::debug?)
      start_job
    end
  end
end

# File lib/shell/process-controller.rb, line 221
def wait_all_jobs_execution
  @job_monitor.synchronize do
    begin
      while !jobs.empty?
        @job_condition.wait(@job_monitor)
        for job in jobs
          job.notify("waiting job(%id)", Shell::debug?)
        end
      end
    ensure
      redo unless jobs.empty?
    end
  end
end

# File lib/shell/process-controller.rb, line 176
def waiting_job?(job)
  @jobs_sync.synchronize(:SH) do
    @waiting_jobs.include?(job)
  end
end

# File lib/shell/process-controller.rb, line 118
def waiting_jobs
  @waiting_jobs
end

# File lib/shell/process-controller.rb, line 134
def waiting_jobs_exist?
  @jobs_sync.synchronize(:SH) do
    @waiting_jobs.empty?
  end
end