Start the process, essentially forks and calls target function.
338569
def start(self):
        """""" 
        logger.info("starting process")
        process = os.fork()
        time.sleep(0.01)
        if process != 0:
            logger.debug('starting child watcher')
            self.loop.reset()
            self.child_pid = process
            self.watcher = pyev.Child(self.child_pid, False, self.loop, self._child)
            self.watcher.start()
        else:
            self.loop.reset()
            logger.debug('running main function')
            self.run(*self.args, **self.kwargs) 
            logger.debug('quitting')
            sys.exit(0)
208544
public function start() {
		$pid = @ pcntl_fork();
		if( $pid == -1 ) {
			throw new Exception( $this->getError( Thread::COULD_NOT_FORK ), Thread::COULD_NOT_FORK );
		}
		if( $pid ) {
			// parent
			$this->pid = $pid;
		}
		else {
			// child
			pcntl_signal( SIGTERM, array( $this, 'signalHandler' ) );
			$arguments = func_get_args();
			if ( !empty( $arguments ) ) {
				call_user_func_array( $this->runnable, $arguments );
			}
			else {
				call_user_func( $this->runnable );
			}

			exit( 0 );
		}
	}
1328689
def start

      unless @allow_multiple
        if running?
          log(:error, "\"#{@name}\" is already running (PID: #{@pid})")
          return
        end
      end

      @pid = fork do
        begin
          Process.setsid

          open(@pid_file, 'w') do |f|
            f << Process.pid
            @pid = Process.pid
          end

          execute_callback(:before_start)

          Dir.chdir @path.to_s
          File.umask 0000

          if @logger
            log = File.new(@log_file, "a")
            log.sync = @sync_log

            STDIN.reopen "/dev/null"
            STDOUT.reopen log
            STDERR.reopen STDOUT
          end

          trap("TERM") do
            stop
          end

          execute_callback(:start)

        rescue RuntimeError => message
          STDERR.puts message
          STDERR.puts message.backtrace

          execute_callback(:error)
        rescue => message
          STDERR.puts message
          STDERR.puts message.backtrace

          execute_callback(:error)
        end
      end

    rescue => message
      STDERR.puts message
      STDERR.puts message.backtrace
      execute_callback(:error)
    end
265813
private function ensureProcessIsStarted(): void
    {
        if (is_resource($this->process) === false) {
            $this->startProcess();

            $this->handleStartupErrors();
        }
    }
70227
def _start(self):
        
        try:
            self._polling_method.run()
        except Exception as err:
            self._exception = err

        finally:
            self._done.set()

        callbacks, self._callbacks = self._callbacks, []
        while callbacks:
            for call in callbacks:
                call(self._polling_method)
            callbacks, self._callbacks = self._callbacks, []
782158
def start(&block)
      fail 'No start block given.' if block.nil?
      check_existing_pid
      puts "Starting process..."
      Process.daemon if @opts[:daemonize]
      change_privileges if @opts[:auto_default_actions]
      redirect_outputs if @opts[:auto_default_actions]
      write_pid
      trap_default_signals if @opts[:auto_default_actions]
      block.call('start')
    end
1256566
private void startProcess() throws IOException {
    LOG.info("Building process");
    ProcessBuilder processBuilder = new ProcessBuilder(command);
    processBuilder.redirectError(ProcessBuilder.Redirect.INHERIT);
    processBuilder.redirectOutput(ProcessBuilder.Redirect.INHERIT);
 
    LOG.info("Starting process");
    process = processBuilder.start();
    LOG.info("Process started");
  }
228794
def run(self):
        """"""
        self.signal_init()
        self.listen_init()
        self.logger.info('starting')
        self.loop.start()
483625
def _start(self):
        """"""
        error = None
        output = None

        try:
            output = self.func(*self.args, **self.kwargs)
        except Exception as err:
            error = err

        if not self._is_finished:
            self.sig_finished.emit(self, output, error)
        self._is_finished = True
965628
def post_fork_child(self):
    """"""
    entry_point = '{}:launch'.format(__name__)
    exec_env = combined_dict(os.environ, dict(PANTS_ENTRYPOINT=entry_point))
    # Pass all of sys.argv so that we can proxy arg flags e.g. `-ldebug`.
    cmd = [sys.executable] + sys.argv
    self._logger.debug('cmd is: PANTS_ENTRYPOINT={} {}'.format(entry_point, ' '.join(cmd)))
    # TODO: Improve error handling on launch failures.
    os.spawnve(os.P_NOWAIT, sys.executable, cmd, env=exec_env)
339018
def start(self):
        ''''''
        assert self._client is None

        logger.debug('IsolationContext[%d] starting', id(self))

        # Create the queues
        request_queue = multiprocessing.Queue()
        response_queue = multiprocessing.Queue()

        # Launch the server process
        server = Server(request_queue, response_queue)  # Do not keep a reference to this object!
        server_process = multiprocessing.Process(target=server.loop)
        server_process.start()

        # Create a client to talk to the server
        self._client = Client(server_process, request_queue, response_queue)
152616
def spawn_process(self, target, *args):
        
        p = Process(target=target, args=args)
        p.daemon = True
        if target == worker:
            p.daemon = Conf.DAEMONIZE_WORKERS
            p.timer = args[2]
            self.pool.append(p)
        p.start()
        return p
1215509
private function startProcess(): void
    {
        $this->process = proc_open($this->command, static::DESCRIPTOR_SPEC, $this->pipes, $this->cwd);

        foreach ($this->pipes as $pipe) {
            stream_set_blocking($pipe, false);
        }
    }
1333300
def start_processes(self, name, quantity):
        
        [self.start_process(name) for i in range(0, quantity or 0)]
447349
def start(self):
        
        self.thread_handler.run(target=self.start_blocking)
        self.thread_handler.start_run_loop()
899696
public function start()
    {
        $pipes = [];

        $this->process = call_user_func_array(
            $this->resourceOpen,
            [$this->executable, self::$descriptorspec, &$pipes]
        );

        // make output and error streams non-blocking streams
        stream_set_blocking($pipes[1], 0);
        stream_set_blocking($pipes[2], 0);

        $this->pipes = $pipes;
        $this->started = true;
    }
171519
function start() {
  const node = process.execPath
  const daemonFile = path.join(__dirname, '../daemon')
  const startupFile = startup.getFile('hotel')

  startup.create('hotel', node, [daemonFile], common.logFile)

  // Save startup file path in ~/.hotel
  // Will be used later by uninstall script
  mkdirp.sync(common.hotelDir)
  fs.writeFileSync(common.startupFile, startupFile)

  console.log(`Started http://localhost:${conf.port}`)
}