Class: UnicornHorn::SelfPipeDaemon

Inherits:
Object
  • Object
show all
Extended by:
Configurer
Defined in:
lib/unicorn_horn/self_pipe_daemon.rb

Direct Known Subclasses

Runner

Constant Summary collapse

SELF_PIPE = 
[]
SIG_QUEUE = 
[]

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SelfPipeDaemon

Returns a new instance of SelfPipeDaemon.



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# File 'lib/unicorn_horn/self_pipe_daemon.rb', line 26

def initialize
  SELF_PIPE.replace(IO.pipe)
  SELF_PIPE.each { |io| io.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC) }
end

Instance Method Details

#forget ⇒ Object 



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# File 'lib/unicorn_horn/self_pipe_daemon.rb', line 45

def forget
  @signals.each { |sig| trap(sig, nil) }
  SIG_QUEUE.clear
  SELF_PIPE.each { |io| io.close rescue nil }
end

#ploop ⇒ Object 



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# File 'lib/unicorn_horn/self_pipe_daemon.rb', line 31

def ploop
  Utils.proc_name 'master'
  logger.info "master process ready"

  begin
    yield SIG_QUEUE.shift
  rescue => e
    logger.error "Unhandled master loop exception #{e.inspect}."
    logger.error e.backtrace.join("\n")
  end while true

  logger.info "master complete"
end

#psleep(sec) ⇒ Object 



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# File 'lib/unicorn_horn/self_pipe_daemon.rb', line 10

def psleep(sec)
  IO.select([ SELF_PIPE[0] ], nil, nil, sec) or return
  SELF_PIPE[0].read_nonblock(16*1024, "")
  rescue Errno::EAGAIN, Errno::EINTR
end

#pwake ⇒ Object 



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# File 'lib/unicorn_horn/self_pipe_daemon.rb', line 16

def pwake
  SELF_PIPE[1].write_nonblock('.') # wakeup master process from select
  rescue Errno::EAGAIN, Errno::EINTR
end

#register(*signals) ⇒ Object 



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# File 'lib/unicorn_horn/self_pipe_daemon.rb', line 21

def register *signals
  @signals = signals
  signals.each { |sig| trap(sig){ |sig_nr| SIG_QUEUE << sig; pwake } }
end