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# frozen_string_literal: false
#
# shell/process-controller.rb -
# $Release Version: 0.7 $
# $Revision: 60139 $
# by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#
require "forwardable"
require "sync"
class Shell
class ProcessController
@ProcessControllers = {}
@ProcessControllersMonitor = Thread::Mutex.new
@ProcessControllersCV = Thread::ConditionVariable.new
@BlockOutputMonitor = Thread::Mutex.new
@BlockOutputCV = Thread::ConditionVariable.new
class << self
extend Forwardable
def_delegator("@ProcessControllersMonitor",
"synchronize", "process_controllers_exclusive")
def active_process_controllers
process_controllers_exclusive do
@ProcessControllers.dup
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)
@ProcessControllersCV.signal
end
end
end
end
def each_active_object
process_controllers_exclusive do
for ref in @ProcessControllers.keys
yield ref
end
end
end
def block_output_synchronize(&b)
@BlockOutputMonitor.synchronize(&b)
end
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
end
# for shell-command complete finish at this process exit.
USING_AT_EXIT_WHEN_PROCESS_EXIT = true
at_exit do
wait_to_finish_all_process_controllers unless $@
end
def initialize(shell)
@shell = shell
@waiting_jobs = []
@active_jobs = []
@jobs_sync = Sync.new
@job_monitor = Thread::Mutex.new
@job_condition = Thread::ConditionVariable.new
end
attr_reader :shell
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.dup
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?
command.notify("start_job in terminate_job(%id)", Shell::debug?)
start_job
end
end
end
# kill a job
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
# wait for all jobs to terminate
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
# simple fork
def sfork(command)
pipe_me_in, pipe_peer_out = IO.pipe
pipe_peer_in, pipe_me_out = IO.pipe
pid = nil
pid_mutex = Thread::Mutex.new
pid_cv = Thread::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.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
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
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
@job_monitor.synchronize do
terminate_job(command)
@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
end
end
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