From 469c1f3f40f279906aceceb7cd4aef80eeffd642 Mon Sep 17 00:00:00 2001
From: "(no author)" <(no author)@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 4 Jun 2001 09:02:30 +0000
Subject: This commit was manufactured by cvs2svn to create tag 'v1_6_4'.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_6_4@1498 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/shell/process-controller.rb | 258 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 258 insertions(+)
 create mode 100644 lib/shell/process-controller.rb

(limited to 'lib/shell/process-controller.rb')

diff --git a/lib/shell/process-controller.rb b/lib/shell/process-controller.rb
new file mode 100644
index 0000000000..26fb1d9f08
--- /dev/null
+++ b/lib/shell/process-controller.rb
@@ -0,0 +1,258 @@
+#
+#   shell/process-controller.rb - 
+#   	$Release Version: 0.6.0 $
+#   	$Revision$
+#   	$Date$
+#   	by Keiju ISHITSUKA(Nihon Rational Software Co.,Ltd)
+#
+# --
+#
+#   
+#
+
+require "mutex_m"
+require "monitor"
+require "sync"
+
+class Shell
+  class ProcessController
+
+    @ProcessControllers = {}
+    @ProcessControllers.extend Mutex_m
+
+    class<<self
+
+      def process_controllers_exclusive
+	begin
+	  @ProcessControllers.lock unless Thread.critical 
+	  yield
+	ensure
+	  @ProcessControllers.unlock unless Thread.critical 
+	end
+      end
+
+      def activate(pc)
+	process_controllers_exclusive do
+	  @ProcessControllers[pc] ||= 0
+	  @ProcessControllers[pc] += 1
+	end
+      end
+
+      def inactivate(pc)
+	process_controllers_exclusive do
+	  if @ProcessControllers[pc]
+	    if (@ProcessControllers[pc] -= 1) == 0
+	      @ProcessControllers.delete(pc)
+	    end
+	  end
+	end
+      end
+
+      def each_active_object
+	process_controllers_exclusive do
+	  for ref in @ProcessControllers.keys
+	    yield ref
+	  end
+	end
+      end
+    end
+
+    def initialize(shell)
+      @shell = shell
+      @waiting_jobs = []
+      @active_jobs = []
+      @jobs_sync = Sync.new
+
+      @job_monitor = Mutex.new
+      @job_condition = ConditionVariable.new
+    end
+
+    def jobs
+      jobs = []
+      @jobs_sync.synchronize(:SH) do
+	jobs.concat @waiting_jobs
+	jobs.concat @active_jobs
+      end
+      jobs
+    end
+
+    def active_jobs
+      @active_jobs
+    end
+
+    def waiting_jobs
+      @waiting_jobs
+    end
+    
+    def jobs_exist?
+      @jobs_sync.synchronize(:SH) do
+	@active_jobs.empty? or @waiting_jobs.empty?
+      end
+    end
+
+    def active_jobs_exist?
+      @jobs_sync.synchronize(:SH) do
+	@active_jobs.empty?
+      end
+    end
+
+    def waiting_jobs_exist?
+      @jobs_sync.synchronize(:SH) do
+	@waiting_jobs.empty?
+      end
+    end
+
+    # schedule a command
+    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
+
+    # start a job
+    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
+
+    def waiting_job?(job)
+      @jobs_sync.synchronize(:SH) do
+	@waiting_jobs.include?(job)
+      end
+    end
+
+    def active_job?(job)
+      @jobs_sync.synchronize(:SH) do
+	@active_jobs.include?(job)
+      end
+    end
+
+    # terminate a job
+    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
+
+    # kill a job
+    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
+
+    # wait for all jobs to terminate
+    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
+
+    # simple fork
+    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
+	    terminate_job(command)
+	    @job_condition.signal
+	    command.notify "job(%id) finish.", @shell.debug?
+	  end
+	end
+      }
+      return pid, pipe_me_in, pipe_me_out
+    end
+  end
+end
-- 
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