Class: Shell::ProcessController

Inherits:
Object
  • Object
show all
Defined in:
lib/shell/process-controller.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(shell) ⇒ ProcessController

Returns a new instance of ProcessController.



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# File 'lib/shell/process-controller.rb', line 60

def initialize(shell)
  @shell = shell
  @waiting_jobs = []
  @active_jobs = []
  @jobs_sync = Sync.new

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

Class Method Details

.activate(pc) ⇒ Object 



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# File 'lib/shell/process-controller.rb', line 34

def activate(pc)
	process_controllers_exclusive do
	  @ProcessControllers[pc] ||= 0
	  @ProcessControllers[pc] += 1
	end
end

.each_active_object ⇒ Object 



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# File 'lib/shell/process-controller.rb', line 51

def each_active_object
	process_controllers_exclusive do
	  for ref in @ProcessControllers.keys
	    yield ref
	  end
	end
end

.inactivate(pc) ⇒ Object 



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# File 'lib/shell/process-controller.rb', line 41

def inactivate(pc)
	process_controllers_exclusive do
	  if @ProcessControllers[pc]
	    if (@ProcessControllers[pc] -= 1) == 0
 @ProcessControllers.delete(pc)
	    end
	  end
	end
end

.process_controllers_exclusive ⇒ Object 



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# File 'lib/shell/process-controller.rb', line 25

def process_controllers_exclusive
	begin
	  @ProcessControllers.lock unless Thread.critical 
	  yield
	ensure
	  @ProcessControllers.unlock unless Thread.critical 
	end
end

Instance Method Details

#active_job?(job) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/shell/process-controller.rb', line 143

def active_job?(job)
  @jobs_sync.synchronize(:SH) do
	@active_jobs.include?(job)
  end
end

#active_jobs ⇒ Object 



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# File 'lib/shell/process-controller.rb', line 79

def active_jobs
  @active_jobs
end

#active_jobs_exist? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/shell/process-controller.rb', line 93

def active_jobs_exist?
  @jobs_sync.synchronize(:SH) do
	@active_jobs.empty?
  end
end

#add_schedule(command) ⇒ Object

schedule a command



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# File 'lib/shell/process-controller.rb', line 106

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

#jobs ⇒ Object 



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# File 'lib/shell/process-controller.rb', line 70

def jobs
  jobs = []
  @jobs_sync.synchronize(:SH) do
	jobs.concat @waiting_jobs
	jobs.concat @active_jobs
  end
  jobs
end

#jobs_exist? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/shell/process-controller.rb', line 87

def jobs_exist?
  @jobs_sync.synchronize(:SH) do
	@active_jobs.empty? or @waiting_jobs.empty?
  end
end

#kill_job(sig, command) ⇒ Object

kill a job



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# File 'lib/shell/process-controller.rb', line 161

def kill_job(sig, command)
  @jobs_sync.synchronize(:SH) 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

#sfork(command, &block) ⇒ Object

simple fork



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# File 'lib/shell/process-controller.rb', line 194

def sfork(command, &block)
  pipe_me_in, pipe_peer_out = IO.pipe
  pipe_peer_in, pipe_me_out = IO.pipe
  Thread.critical = true

  STDOUT.flush
  ProcessController.each_active_object do |pc|
	for jobs in pc.active_jobs
	  jobs.flush
	end
  end
  
  pid = fork {
	Thread.critical = true

	Thread.list.each do |th| 
	  th.kill unless [Thread.main, Thread.current].include?(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
  }

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

  th = Thread.start {
	Thread.critical = true
	begin
	  _pid = nil
	  command.notify("job(%id) start to waiting finish.", @shell.debug?)
	  Thread.critical = false
	  _pid = Process.waitpid(pid, nil)
	rescue Errno::ECHILD
	  command.notify "warn: job(%id) was done already waitipd."
	  _pid = true
	ensure
	  # when the process ends, wait until the command termintes
	  if _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
	  Thread.exclusive do
 @job_monitor.synchronize do 
   terminate_job(command)
   @job_condition.signal
   command.notify "job(%id) finish.", @shell.debug?
 end
	  end
	end
  }
  return pid, pipe_me_in, pipe_me_out
end

#start_job(command = nil) ⇒ Object

start a job



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# File 'lib/shell/process-controller.rb', line 118

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
	  return unless command
	end
	@active_jobs.push command
	command.start

	# start all jobs that input from the job
	for job in @waiting_jobs
	  start_job(job) if job.input == command
	end
  end
end

#terminate_job(command) ⇒ Object

terminate a job



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# File 'lib/shell/process-controller.rb', line 150

def terminate_job(command)
  @jobs_sync.synchronize(:EX) do
	@active_jobs.delete command
	ProcessController.inactivate(self)
	if @active_jobs.empty?
	  start_job
	end
  end
end

#wait_all_jobs_execution ⇒ Object

wait for all jobs to terminate



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# File 'lib/shell/process-controller.rb', line 181

def wait_all_jobs_execution
  @job_monitor.synchronize do
	begin
	  while !jobs.empty?
 @job_condition.wait(@job_monitor)
	  end
	ensure
	  redo unless jobs.empty?
	end
  end
end

#waiting_job?(job) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/shell/process-controller.rb', line 137

def waiting_job?(job)
  @jobs_sync.synchronize(:SH) do
	@waiting_jobs.include?(job)
  end
end

#waiting_jobs ⇒ Object 



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# File 'lib/shell/process-controller.rb', line 83

def waiting_jobs
  @waiting_jobs
end

#waiting_jobs_exist? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/shell/process-controller.rb', line 99

def waiting_jobs_exist?
  @jobs_sync.synchronize(:SH) do
	@waiting_jobs.empty?
  end
end