Module: PidLock

Defined in:
lib/pid_lock.rb,
lib/pid_lock/version.rb

Constant Summary collapse

VERSION = 
"0.0.2"
@@pid_path = 
nil

Class Method Summary collapse

Class Method Details

.lock(pid_name) ⇒ Object 



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# File 'lib/pid_lock.rb', line 16

def lock(pid_name)
  Dir.exists?(pid_path) or FileUtils.mkdir_p(pid_path)
  File.write(File.join(pid_path, "#{pid_name}.pid"), $$)
end

.locked?(pid_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pid_lock.rb', line 21

def locked?(pid_name)
  return false unless File.exists?(File.join(pid_path, "#{pid_name}.pid"))
  begin
    Process.kill(0, pid(pid_name))
    return true
  rescue
    self.unlock(pid_name)
    return false
  end
end

.pid(pid_name) ⇒ Object 



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# File 'lib/pid_lock.rb', line 32

def pid(pid_name)
  File.read(File.join(pid_path, "#{pid_name}.pid")).to_i
end

.pid_path ⇒ Object 



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# File 'lib/pid_lock.rb', line 12

def pid_path
  @@pid_path || "tmp/pid_locks"
end

.pid_path=(path) ⇒ Object 



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# File 'lib/pid_lock.rb', line 8

def pid_path=(path)
  @@pid_path = path
end

.unlock(pid_name) ⇒ Object 



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# File 'lib/pid_lock.rb', line 36

def unlock(pid_name)
  if File.exists?(File.join(pid_path, "#{pid_name}.pid"))
    File.delete(File.join(pid_path, "#{pid_name}.pid"))
  end
end