Python os.getpid() Examples

def test_err_in_fun(self):
            # Test that the original signal this process was hit with
            # is not returned in case fun raise an exception. Instead,
            # we're supposed to see retsig = 1.
            ret = pyrun(textwrap.dedent(
                """
                import os, signal, imp, sys
                mod = imp.load_source("mod", r"{}")

                def foo():
                    sys.stderr = os.devnull
                    1 / 0

                sig = signal.SIGTERM if os.name == 'posix' else \
                    signal.CTRL_C_EVENT
                mod.register_exit_fun(foo)
                os.kill(os.getpid(), sig)
                """.format(os.path.abspath(__file__), TESTFN)
            ))
            if POSIX:
                self.assertEqual(ret, 1)
                assert ret != signal.SIGTERM, strfsig(ret) 

def openBrowserRecursively(total, idName, browser):
	try:
		for i in range(total):
			iterator = i * 100
			url = r"https://www.google.com/search?q={word}&newwindow=1&biw=300&bih=629&tbm=isch&ijn={times}&start={start}"
			try:
				browser.get(url.format(word= idName, start=iterator,times = i))
			except SocketError as e:
				if e.errno != errno.ECONNRESET:
					raise # raise to reset the connection
				pass
		time.sleep(1.5) # 1.5 seconds is the tuned time for HKU service not to be monitored and closed
	except:
		if isWindows:
			os.system("taskkill /im chrome.exe /F")
		else :
			os.system("kill " + str(os.getpid()))
		openBrowserRecursively(total, idName, browser)
	
# basic session setup 

def connect(self, vif, ifname, netns):
        host_ifname = vif.vif_name

        with b_base.get_ipdb(netns) as c_ipdb:
            with c_ipdb.create(ifname=ifname, peer=host_ifname,
                               kind='veth') as c_iface:
                c_iface.mtu = vif.network.mtu
                c_iface.address = str(vif.address)
                c_iface.up()

            if netns:
                with c_ipdb.interfaces[host_ifname] as h_iface:
                    h_iface.net_ns_pid = os.getpid()

        with b_base.get_ipdb() as h_ipdb:
            with h_ipdb.interfaces[host_ifname] as h_iface:
                h_iface.mtu = vif.network.mtu
                h_iface.up() 

def write_pid_to_pidfile(pidfile_path):
    """ Write the PID in the named PID file.

        Get the numeric process ID (“PID”) of the current process
        and write it to the named file as a line of text.

        """
    open_flags = (os.O_CREAT | os.O_EXCL | os.O_WRONLY)
    open_mode = 0o644
    pidfile_fd = os.open(pidfile_path, open_flags, open_mode)
    pidfile = os.fdopen(pidfile_fd, 'w')

    # According to the FHS 2.3 section on PID files in /var/run:
    #
    #   The file must consist of the process identifier in
    #   ASCII-encoded decimal, followed by a newline character. For
    #   example, if crond was process number 25, /var/run/crond.pid
    #   would contain three characters: two, five, and newline.

    pid = os.getpid()
    pidfile.write("%s\n" % pid)
    pidfile.close() 

def write_pid_to_pidfile(pidfile_path):
    """ Write the PID in the named PID file.

        Get the numeric process ID (“PID”) of the current process
        and write it to the named file as a line of text.

        """
    open_flags = (os.O_CREAT | os.O_EXCL | os.O_WRONLY)
    open_mode = 0o644
    pidfile_fd = os.open(pidfile_path, open_flags, open_mode)
    pidfile = os.fdopen(pidfile_fd, 'w')

    # According to the FHS 2.3 section on PID files in /var/run:
    #
    #   The file must consist of the process identifier in
    #   ASCII-encoded decimal, followed by a newline character. For
    #   example, if crond was process number 25, /var/run/crond.pid
    #   would contain three characters: two, five, and newline.

    pid = os.getpid()
    pidfile.write("%s\n" % pid)
    pidfile.close() 

def test_deadDeviceManager(self):
        devmgr_nb, devMgr = self.launchDeviceManager("/nodes/test_SelfTerminatingDevice_node/DeviceManager.dcd.xml")
        self.assertNotEqual(devMgr, None)

        # NOTE These assert check must be kept in-line with the DeviceManager.dcd.xml
        self.assertEqual(len(devMgr._get_registeredDevices()), 1)

        devs = devMgr._get_registeredDevices()
        pids = getChildren(os.getpid())
        devMgrPid = 0
        for entry in pids:
            tmp_pids = getChildren(entry)
            if len(tmp_pids)>0:
                devMgrPid = entry
        self.assertNotEqual(devMgrPid, 0)

        # Test that the DCD file componentproperties get pushed to configure()
        # as per DeviceManager requirement SR:482
        devMgr.shutdown()

        time.sleep(1.0)
        self.assertNotEqual(devmgr_nb.poll(), None, "Nodebooter did not die after shutdown") 

def __init__(self, path='', db=0, password=None,
                 socket_timeout=None, encoding='utf-8',
                 encoding_errors='strict', decode_responses=False,
                 retry_on_timeout=False,
                 parser_class=DefaultParser, socket_read_size=65536):
        self.pid = os.getpid()
        self.path = path
        self.db = db
        self.password = password
        self.socket_timeout = socket_timeout
        self.retry_on_timeout = retry_on_timeout
        self.encoding = encoding
        self.encoding_errors = encoding_errors
        self.decode_responses = decode_responses
        self._sock = None
        self._parser = parser_class(socket_read_size=socket_read_size)
        self._description_args = {
            'path': self.path,
            'db': self.db,
        }
        self._connect_callbacks = [] 

def choose_boundary():
    global _prefix

    if _prefix is None:
        hostid = socket.gethostbyname(socket.gethostname())

        try:
            uid = `os.getuid()`
        except:
            uid = '1'
        try:
            pid = `os.getpid()`
        except:
            pid = '1'

        _prefix = hostid + '.' + uid + '.' + pid

    timestamp = '%.3f' % time.time()
    seed = `random.randint(0, 32767)`
    return _prefix + '.' + timestamp + '.' + seed 

def run_daemon(server, pidfile, daemonize=True):
    """Run the server as a daemon

    :param server: cutlery (a Spoon or Spork)
    :param pidfile: the file to keep the parent PID
    :param daemonize: if True fork the processes into
      a daemon.
    :return:
    """
    logger = logging.getLogger(server.server_logger)
    if daemonize:
        detach(pidfile=pidfile, logger=logger)
    elif pidfile:
        with open(pidfile, "w+") as pidf:
            pidf.write("%s\n" % os.getpid())
    try:
        server.serve_forever()
    finally:
        try:
            os.remove(pidfile)
        except OSError:
            pass 

def choose_boundary():
    """Return a string usable as a multipart boundary.

    The string chosen is unique within a single program run, and
    incorporates the user id (if available), process id (if available),
    and current time.  So it's very unlikely the returned string appears
    in message text, but there's no guarantee.

    The boundary contains dots so you have to quote it in the header."""

    global _prefix
    import time
    if _prefix is None:
        import socket
        try:
            hostid = socket.gethostbyname(socket.gethostname())
        except socket.gaierror:
            hostid = '127.0.0.1'
        try:
            uid = repr(os.getuid())
        except AttributeError:
            uid = '1'
        try:
            pid = repr(os.getpid())
        except AttributeError:
            pid = '1'
        _prefix = hostid + '.' + uid + '.' + pid
    return "%s.%.3f.%d" % (_prefix, time.time(), _get_next_counter())


# Subroutines for decoding some common content-transfer-types 

def __init__(self, maxsize=0):
        if maxsize <= 0:
            maxsize = _multiprocessing.SemLock.SEM_VALUE_MAX
        self._maxsize = maxsize
        self._reader, self._writer = Pipe(duplex=False)
        self._rlock = Lock()
        self._opid = os.getpid()
        if sys.platform == 'win32':
            self._wlock = None
        else:
            self._wlock = Lock()
        self._sem = BoundedSemaphore(maxsize)

        self._after_fork()

        if sys.platform != 'win32':
            register_after_fork(self, Queue._after_fork) 

def malloc(self, size):
        # return a block of right size (possibly rounded up)
        assert 0 <= size < sys.maxint
        if os.getpid() != self._lastpid:
            self.__init__()                     # reinitialize after fork
        self._lock.acquire()
        try:
            size = self._roundup(max(size,1), self._alignment)
            (arena, start, stop) = self._malloc(size)
            new_stop = start + size
            if new_stop < stop:
                self._free((arena, new_stop, stop))
            block = (arena, start, new_stop)
            self._allocated_blocks.add(block)
            return block
        finally:
            self._lock.release()

#
# Class representing a chunk of an mmap -- can be inherited
# 

def start(self):
        '''
        Start child process
        '''
        assert self._popen is None, 'cannot start a process twice'
        assert self._parent_pid == os.getpid(), \
               'can only start a process object created by current process'
        assert not _current_process._daemonic, \
               'daemonic processes are not allowed to have children'
        _cleanup()
        if self._Popen is not None:
            Popen = self._Popen
        else:
            from .forking import Popen
        self._popen = Popen(self)
        _current_process._children.add(self) 

def __repr__(self):
        if self is _current_process:
            status = 'started'
        elif self._parent_pid != os.getpid():
            status = 'unknown'
        elif self._popen is None:
            status = 'initial'
        else:
            if self._popen.poll() is not None:
                status = self.exitcode
            else:
                status = 'started'

        if type(status) is int:
            if status == 0:
                status = 'stopped'
            else:
                status = 'stopped[%s]' % _exitcode_to_name.get(status, status)

        return '<%s(%s, %s%s)>' % (type(self).__name__, self._name,
                                   status, self._daemonic and ' daemon' or '')

    ## 

def make_msgid(idstring=None):
    """Returns a string suitable for RFC 2822 compliant Message-ID, e.g:

    <[email protected]>

    Optional idstring if given is a string used to strengthen the
    uniqueness of the message id.
    """
    timeval = time.time()
    utcdate = time.strftime('%Y%m%d%H%M%S', time.gmtime(timeval))
    pid = os.getpid()
    randint = random.randrange(100000)
    if idstring is None:
        idstring = ''
    else:
        idstring = '.' + idstring
    idhost = socket.getfqdn()
    msgid = '<%s.%s.%s%[email protected]%s>' % (utcdate, pid, randint, idstring, idhost)
    return msgid



# These functions are in the standalone mimelib version only because they've
# subsequently been fixed in the latest Python versions.  We use this to worm
# around broken older Pythons. 

def read_current_rss():
    pid = os.getpid()

    output = None
    try:
        f = open('/proc/{0}/status'.format(os.getpid()))
        output = f.read()
        f.close()
    except Exception:
        return None

    m = VmRSSRe.search(output)
    if m:
        return int(float(m.group(1)))

    return None 

def read_vm_size():
    pid = os.getpid()

    output = None
    try:
        f = open('/proc/{0}/status'.format(os.getpid()))
        output = f.read()
        f.close()
    except Exception:
        return None

    m = VmSizeRe.search(output)
    if m:
        return int(float(m.group(1)))

    return None 

def register_signal(signal_number, handler_func, once = False):
    prev_handler = None

    def _handler(signum, frame):
        skip_prev = handler_func(signum, frame)

        if not skip_prev:
            if callable(prev_handler):
                if once:
                    signal.signal(signum, prev_handler)
                prev_handler(signum, frame)
            elif prev_handler == signal.SIG_DFL and once:
                signal.signal(signum, signal.SIG_DFL)
                os.kill(os.getpid(), signum)

    prev_handler = signal.signal(signal_number, _handler) 

def __enter__(self):
        if self.path is None:
            return self.pidfile

        self.pidfile = open(self.path, "a+")
        try:
            fcntl.flock(self.pidfile.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
        except IOError:
            self.pidfile = None
            raise SystemExit("Already running according to " + self.path)
        self.pidfile.seek(0)
        self.pidfile.truncate()
        self.pidfile.write(str(os.getpid()))
        self.pidfile.flush()
        self.pidfile.seek(0)
        return self.pidfile 

def open(self):
        """Start monitoring, or restart after a fork.

        No effect if called multiple times.

        .. warning:: To avoid a deadlock during Python's getaddrinfo call,
          will generate a warning if open() is called from a different
          process than the one that initialized the Topology. To prevent this
          from happening, MongoClient must be created after any forking OR
          MongoClient must be started with connect=False.
        """
        with self._lock:
            if self._pid is None:
                self._pid = os.getpid()
            else:
                if os.getpid() != self._pid:
                    warnings.warn(
                        "MongoClient opened before fork. Create MongoClient "
                        "with connect=False, or create client after forking. "
                        "See PyMongo's documentation for details: http://api."
                        "mongodb.org/python/current/faq.html#using-pymongo-"
                        "with-multiprocessing>")

            self._ensure_opened() 

def startEventLoop(name, port, authkey, ppid, debug=False):
    if debug:
        import os
        cprint.cout(debug, '[%d] connecting to server at port localhost:%d, authkey=%s..\n' 
                    % (os.getpid(), port, repr(authkey)), -1)
    conn = multiprocessing.connection.Client(('localhost', int(port)), authkey=authkey)
    if debug:
        cprint.cout(debug, '[%d] connected; starting remote proxy.\n' % os.getpid(), -1)
    global HANDLER
    #ppid = 0 if not hasattr(os, 'getppid') else os.getppid()
    HANDLER = RemoteEventHandler(conn, name, ppid, debug=debug)
    while True:
        try:
            HANDLER.processRequests()  # exception raised when the loop should exit
            time.sleep(0.01)
        except ClosedError:
            break 

def startQtEventLoop(name, port, authkey, ppid, debug=False):
    if debug:
        import os
        cprint.cout(debug, '[%d] connecting to server at port localhost:%d, authkey=%s..\n' % (os.getpid(), port, repr(authkey)), -1)
    conn = multiprocessing.connection.Client(('localhost', int(port)), authkey=authkey)
    if debug:
        cprint.cout(debug, '[%d] connected; starting remote proxy.\n' % os.getpid(), -1)
    from ..Qt import QtGui, QtCore
    app = QtGui.QApplication.instance()
    #print app
    if app is None:
        app = QtGui.QApplication([])
        app.setQuitOnLastWindowClosed(False)  ## generally we want the event loop to stay open 
                                              ## until it is explicitly closed by the parent process.
    
    global HANDLER
    HANDLER = RemoteQtEventHandler(conn, name, ppid, debug=debug)
    HANDLER.startEventTimer()
    app.exec_() 

def startEventLoop(name, port, authkey, ppid, debug=False):
    if debug:
        import os
        cprint.cout(debug, '[%d] connecting to server at port localhost:%d, authkey=%s..\n' 
                    % (os.getpid(), port, repr(authkey)), -1)
    conn = multiprocessing.connection.Client(('localhost', int(port)), authkey=authkey)
    if debug:
        cprint.cout(debug, '[%d] connected; starting remote proxy.\n' % os.getpid(), -1)
    global HANDLER
    #ppid = 0 if not hasattr(os, 'getppid') else os.getppid()
    HANDLER = RemoteEventHandler(conn, name, ppid, debug=debug)
    while True:
        try:
            HANDLER.processRequests()  # exception raised when the loop should exit
            time.sleep(0.01)
        except ClosedError:
            break 

def __init__(self):
        self._pid = os.getpid()
        self._loop_lock = Lock()
        self._started = False
        self._shutdown = False

        self._thread = None

        self._timers = TimerManager()

        try:
            dispatcher = self._loop_dispatch_class()
            dispatcher.validate()
            log.debug("Validated loop dispatch with %s", self._loop_dispatch_class)
        except Exception:
            log.exception("Failed validating loop dispatch with %s. Using busy wait execution instead.", self._loop_dispatch_class)
            dispatcher.close()
            dispatcher = _BusyWaitDispatcher()
        self._loop_dispatcher = dispatcher

        atexit.register(partial(_cleanup, weakref.ref(self))) 

def make_msgid(idstring=None):
    """Returns a string suitable for RFC 2822 compliant Message-ID, e.g:

    <[email protected]>

    Optional idstring if given is a string used to strengthen the
    uniqueness of the message id.
    """
    timeval = time.time()
    utcdate = time.strftime('%Y%m%d%H%M%S', time.gmtime(timeval))
    pid = os.getpid()
    randint = random.randrange(100000)
    if idstring is None:
        idstring = ''
    else:
        idstring = '.' + idstring
    idhost = socket.getfqdn()
    msgid = '<%s.%s.%s%[email protected]%s>' % (utcdate, pid, randint, idstring, idhost)
    return msgid



# These functions are in the standalone mimelib version only because they've
# subsequently been fixed in the latest Python versions.  We use this to worm
# around broken older Pythons. 

def write_pid_to_pidfile(pidfile_path):
    """ Write the PID in the named PID file.

        Get the numeric process ID (“PID”) of the current process
        and write it to the named file as a line of text.

        """
    open_flags = (os.O_CREAT | os.O_EXCL | os.O_WRONLY)
    open_mode = 0o644
    pidfile_fd = os.open(pidfile_path, open_flags, open_mode)
    pidfile = os.fdopen(pidfile_fd, 'w')

    # According to the FHS 2.3 section on PID files in /var/run:
    #
    #   The file must consist of the process identifier in
    #   ASCII-encoded decimal, followed by a newline character. For
    #   example, if crond was process number 25, /var/run/crond.pid
    #   would contain three characters: two, five, and newline.

    pid = os.getpid()
    pidfile.write("%s\n" % pid)
    pidfile.close() 

def __init__(self, data, label_dict,
               gold_props_file=None,
               use_se_marker=False,
               pred_props_file=None, 
               word_dict=None):

    self.data = data
    self.best_accuracy = 0.0
    self.has_best = False
    self.label_dict = label_dict
    self.gold_props_file = gold_props_file
    self.pred_props_file = pred_props_file
    self.use_se_marker = use_se_marker
 
    if gold_props_file is None and pred_props_file is None:
      print ('Warning: not using official gold predicates. Not for formal evaluation.')
      ''' Output to mock gold '''
      assert word_dict != None
      conll_output_path = join(ROOT_DIR, 'temp/srl_pred_%d.gold.tmp' % os.getpid())
      print_gold_to_conll(self.data, word_dict, label_dict, conll_output_path)
      self.pred_props_file = conll_output_path 

def commit(my, xml=None):

        if not xml:
            xml = my.xml

        from tactic_client_lib import TacticServerStub
        my.server = TacticServerStub.get()

        search_type = "prod/session_contents"

        # get more info
        pid = os.getpid()
        login = my.server.get_login()

        data = { 'pid': pid, 'login': login, 'data': xml }

        my.server.insert( search_type, data) 

def mounted_at(dev='', loopback=''):
    df = subprocess.check_output(['df'])
    if dev:
	fn = dev[dev.rfind('/')+1:]
	dev_or_loop = dev
	m = re.search('^' + dev + r'\s.*\s(\S+)$', df, flags=re.MULTILINE)
    elif loopback:
	dev_or_loop = loopback
	fn = loopback[loopback.rfind('/')+1:]
	m = re.search(r'\s(/lib/live/\S*' + fn + ')$', df, flags=re.MULTILINE)
    else:
	sys.exit('mounted_at() needs at least one arg')
    if (m):
	return m.group(1)
    else:
        target_mp = '/tmp/mbootuz-' + str(os.getpid()) + '-' + fn
        subprocess.call(['mkdir', target_mp])
        try:
            subprocess.check_output(['mount', dev_or_loop, target_mp])
        except subprocess.CalledProcessError as e:
            subprocess.call(['rmdir', target_mp])
            sys.exit('mount failure [' + e.output +
                '], mbootuz aborted')
	atexit.register(cleanup, target_mp)
        return target_mp 

def _execute_command(self, command):
        if len(self.job_servers) == 0:
            app_log.error('there is no job server')
            return

        server = self.job_servers[self.job_server_index]
        self.job_server_index = (self.job_server_index + 1) % len(self.job_servers)

        context = zmq.Context.instance()
        zmq_sock = context.socket(zmq.DEALER)
        zmq_sock.linger = 1000
        zmq_sock.identity = bytes(str(os.getpid()), 'ascii')
        ip = server['ip']
        if ip == '*':
            ip = 'localhost'
        url = 'tcp://{0}:{1}'.format(ip, server['zmq_port'])
        app_log.info('connect %s', url)
        zmq_sock.connect(url)

        command = json_encode({'command': command})
        app_log.info('command: %s', command)
        zmq_sock.send_multipart([b'0', bytes(command, 'ascii')])

        stream = ZMQStream(zmq_sock)
        stream.on_recv(self.response_handler) 

def write_pid_to_pidfile(pidfile_path):
    """ Write the PID in the named PID file.

        Get the numeric process ID (“PID”) of the current process
        and write it to the named file as a line of text.

        """
    open_flags = (os.O_CREAT | os.O_EXCL | os.O_WRONLY)
    open_mode = 0o644
    pidfile_fd = os.open(pidfile_path, open_flags, open_mode)
    pidfile = os.fdopen(pidfile_fd, 'w')

    # According to the FHS 2.3 section on PID files in /var/run:
    #
    #   The file must consist of the process identifier in
    #   ASCII-encoded decimal, followed by a newline character. For
    #   example, if crond was process number 25, /var/run/crond.pid
    #   would contain three characters: two, five, and newline.

    pid = os.getpid()
    pidfile.write("%s\n" % pid)
    pidfile.close() 

def reset(self):
        # Ignore this race condition -- if many threads are resetting at once,
        # the pool_id will definitely change, which is all we care about.
        self.pool_id += 1
        self.pid = os.getpid()

        sockets = None
        try:
            # Swapping variables is not atomic. We need to ensure no other
            # thread is modifying self.sockets, or replacing it, in this
            # critical section.
            self.lock.acquire()
            sockets, self.sockets = self.sockets, set()
        finally:
            self.lock.release()

        for sock_info in sockets:
            sock_info.close() 

def maybe_return_socket(self, sock_info):
        """Return the socket to the pool unless it's the request socket.
        """
        if sock_info in (NO_REQUEST, NO_SOCKET_YET):
            return

        if self.pid != os.getpid():
            if not sock_info.forced:
                self._socket_semaphore.release()
            self.reset()
        else:
            if sock_info.closed:
                if sock_info.forced:
                    sock_info.forced = False
                elif sock_info != self._get_request_state():
                    self._socket_semaphore.release()
                return

            if sock_info != self._get_request_state():
                self._return_socket(sock_info) 

def __generate(self):
        """Generate a new value for this ObjectId.
        """
        oid = EMPTY

        # 4 bytes current time
        oid += struct.pack(">i", int(time.time()))

        # 3 bytes machine
        oid += ObjectId._machine_bytes

        # 2 bytes pid
        oid += struct.pack(">H", os.getpid() % 0xFFFF)

        # 3 bytes inc
        ObjectId._inc_lock.acquire()
        oid += struct.pack(">i", ObjectId._inc)[1:4]
        ObjectId._inc = (ObjectId._inc + 1) % 0xFFFFFF
        ObjectId._inc_lock.release()

        self.__id = oid 

def write_pid_to_pidfile(pidfile_path):
    """ Write the PID in the named PID file.

        Get the numeric process ID (“PID”) of the current process
        and write it to the named file as a line of text.

        """
    open_flags = (os.O_CREAT | os.O_EXCL | os.O_WRONLY)
    open_mode = 0o644
    pidfile_fd = os.open(pidfile_path, open_flags, open_mode)
    pidfile = os.fdopen(pidfile_fd, 'w')

    # According to the FHS 2.3 section on PID files in /var/run:
    #
    #   The file must consist of the process identifier in
    #   ASCII-encoded decimal, followed by a newline character. For
    #   example, if crond was process number 25, /var/run/crond.pid
    #   would contain three characters: two, five, and newline.

    pid = os.getpid()
    pidfile.write("%s\n" % pid)
    pidfile.close() 

def __init__(self, path='', db=0, password=None,
                 socket_timeout=None, encoding='utf-8',
                 encoding_errors='strict', decode_responses=False,
                 retry_on_timeout=False,
                 parser_class=DefaultParser, socket_read_size=65536):
        self.pid = os.getpid()
        self.path = path
        self.db = db
        self.password = password
        self.socket_timeout = socket_timeout
        self.retry_on_timeout = retry_on_timeout
        self.encoding = encoding
        self.encoding_errors = encoding_errors
        self.decode_responses = decode_responses
        self._sock = None
        self._parser = parser_class(socket_read_size=socket_read_size)
        self._description_args = {
            'path': self.path,
            'db': self.db,
        }
        self._connect_callbacks = [] 

def reset(self):
        # Ignore this race condition -- if many threads are resetting at once,
        # the pool_id will definitely change, which is all we care about.
        self.pool_id += 1
        self.pid = os.getpid()

        sockets = None
        try:
            # Swapping variables is not atomic. We need to ensure no other
            # thread is modifying self.sockets, or replacing it, in this
            # critical section.
            self.lock.acquire()
            sockets, self.sockets = self.sockets, set()
        finally:
            self.lock.release()

        for sock_info in sockets:
            sock_info.close() 

def __generate(self):
        """Generate a new value for this ObjectId.
        """
        oid = EMPTY

        # 4 bytes current time
        oid += struct.pack(">i", int(time.time()))

        # 3 bytes machine
        oid += ObjectId._machine_bytes

        # 2 bytes pid
        oid += struct.pack(">H", os.getpid() % 0xFFFF)

        # 3 bytes inc
        ObjectId._inc_lock.acquire()
        oid += struct.pack(">i", ObjectId._inc)[1:4]
        ObjectId._inc = (ObjectId._inc + 1) % 0xFFFFFF
        ObjectId._inc_lock.release()

        self.__id = oid 

def write_pid_to_pidfile(pidfile_path):
    """ Write the PID in the named PID file.

        Get the numeric process ID (“PID”) of the current process
        and write it to the named file as a line of text.

        """
    open_flags = (os.O_CREAT | os.O_EXCL | os.O_WRONLY)
    open_mode = 0o644
    pidfile_fd = os.open(pidfile_path, open_flags, open_mode)
    pidfile = os.fdopen(pidfile_fd, 'w')

    # According to the FHS 2.3 section on PID files in /var/run:
    #
    #   The file must consist of the process identifier in
    #   ASCII-encoded decimal, followed by a newline character. For
    #   example, if crond was process number 25, /var/run/crond.pid
    #   would contain three characters: two, five, and newline.

    pid = os.getpid()
    pidfile.write("%s\n" % pid)
    pidfile.close() 

def reset(self):
        # Ignore this race condition -- if many threads are resetting at once,
        # the pool_id will definitely change, which is all we care about.
        self.pool_id += 1
        self.pid = os.getpid()

        sockets = None
        try:
            # Swapping variables is not atomic. We need to ensure no other
            # thread is modifying self.sockets, or replacing it, in this
            # critical section.
            self.lock.acquire()
            sockets, self.sockets = self.sockets, set()
        finally:
            self.lock.release()

        for sock_info in sockets:
            sock_info.close() 

def maybe_return_socket(self, sock_info):
        """Return the socket to the pool unless it's the request socket.
        """
        if sock_info in (NO_REQUEST, NO_SOCKET_YET):
            return

        if self.pid != os.getpid():
            if not sock_info.forced:
                self._socket_semaphore.release()
            self.reset()
        else:
            if sock_info.closed:
                if sock_info.forced:
                    sock_info.forced = False
                elif sock_info != self._get_request_state():
                    self._socket_semaphore.release()
                return

            if sock_info != self._get_request_state():
                self._return_socket(sock_info) 

def __generate(self):
        """Generate a new value for this ObjectId.
        """
        oid = EMPTY

        # 4 bytes current time
        oid += struct.pack(">i", int(time.time()))

        # 3 bytes machine
        oid += ObjectId._machine_bytes

        # 2 bytes pid
        oid += struct.pack(">H", os.getpid() % 0xFFFF)

        # 3 bytes inc
        ObjectId._inc_lock.acquire()
        oid += struct.pack(">i", ObjectId._inc)[1:4]
        ObjectId._inc = (ObjectId._inc + 1) % 0xFFFFFF
        ObjectId._inc_lock.release()

        self.__id = oid 

def write_pid_to_pidfile(pidfile_path):
    """ Write the PID in the named PID file.

        Get the numeric process ID (“PID”) of the current process
        and write it to the named file as a line of text.

        """
    open_flags = (os.O_CREAT | os.O_EXCL | os.O_WRONLY)
    open_mode = 0o644
    pidfile_fd = os.open(pidfile_path, open_flags, open_mode)
    pidfile = os.fdopen(pidfile_fd, 'w')

    # According to the FHS 2.3 section on PID files in /var/run:
    #
    #   The file must consist of the process identifier in
    #   ASCII-encoded decimal, followed by a newline character. For
    #   example, if crond was process number 25, /var/run/crond.pid
    #   would contain three characters: two, five, and newline.

    pid = os.getpid()
    pidfile.write("%s\n" % pid)
    pidfile.close() 

def pipe(bufsize=8192):
        """Creates overlapped (asynchronous) pipe.
        """
        name = r'\\.\pipe\pycos-pipe-%d-%d' % (os.getpid(), next(_pipe_id))
        openmode = (win32pipe.PIPE_ACCESS_INBOUND | win32file.FILE_FLAG_OVERLAPPED |
                    FILE_FLAG_FIRST_PIPE_INSTANCE)
        pipemode = (win32pipe.PIPE_TYPE_BYTE | win32pipe.PIPE_READMODE_BYTE)
        rh = wh = None
        try:
            rh = win32pipe.CreateNamedPipe(
                name, openmode, pipemode, 1, bufsize, bufsize,
                win32pipe.NMPWAIT_USE_DEFAULT_WAIT, None)

            wh = win32file.CreateFile(
                name, win32file.GENERIC_WRITE | winnt.FILE_READ_ATTRIBUTES, 0, None,
                win32file.OPEN_EXISTING, win32file.FILE_FLAG_OVERLAPPED, None)

            overlapped = pywintypes.OVERLAPPED()
            # 'yield' can't be used in constructor so use sync wait
            # (in this case it is should be okay)
            overlapped.hEvent = win32event.CreateEvent(None, 0, 0, None)
            rc = win32pipe.ConnectNamedPipe(rh, overlapped)
            if rc == winerror.ERROR_PIPE_CONNECTED:
                win32event.SetEvent(overlapped.hEvent)
            rc = win32event.WaitForSingleObject(overlapped.hEvent, 1000)
            overlapped = None
            if rc != win32event.WAIT_OBJECT_0:
                pycos.logger.warning('connect failed: %s' % rc)
                raise Exception(rc)
            return (rh, wh)
        except:
            if rh is not None:
                win32file.CloseHandle(rh)
            if wh is not None:
                win32file.CloseHandle(wh)
            raise 

def pipe(bufsize=8192):
        """Creates overlapped (asynchronous) pipe.
        """
        name = r'\\.\pipe\pycos-pipe-%d-%d' % (os.getpid(), next(_pipe_id))
        openmode = (win32pipe.PIPE_ACCESS_INBOUND | win32file.FILE_FLAG_OVERLAPPED |
                    FILE_FLAG_FIRST_PIPE_INSTANCE)
        pipemode = (win32pipe.PIPE_TYPE_BYTE | win32pipe.PIPE_READMODE_BYTE)
        rh = wh = None
        try:
            rh = win32pipe.CreateNamedPipe(
                name, openmode, pipemode, 1, bufsize, bufsize,
                win32pipe.NMPWAIT_USE_DEFAULT_WAIT, None)

            wh = win32file.CreateFile(
                name, win32file.GENERIC_WRITE | winnt.FILE_READ_ATTRIBUTES, 0, None,
                win32file.OPEN_EXISTING, win32file.FILE_FLAG_OVERLAPPED, None)

            overlapped = pywintypes.OVERLAPPED()
            # 'yield' can't be used in constructor so use sync wait
            # (in this case it is should be okay)
            overlapped.hEvent = win32event.CreateEvent(None, 0, 0, None)
            rc = win32pipe.ConnectNamedPipe(rh, overlapped)
            if rc == winerror.ERROR_PIPE_CONNECTED:
                win32event.SetEvent(overlapped.hEvent)
            rc = win32event.WaitForSingleObject(overlapped.hEvent, 1000)
            overlapped = None
            if rc != win32event.WAIT_OBJECT_0:
                pycos.logger.warning('connect failed: %s' % rc)
                raise Exception(rc)
            return (rh, wh)
        except:
            if rh is not None:
                win32file.CloseHandle(rh)
            if wh is not None:
                win32file.CloseHandle(wh)
            raise 

def acquire(self, blocking=True):
        """Acquire the lock if possible.

        If the lock is in use and ``blocking`` is ``False``, return
        ``False``.

        Otherwise, check every `self.delay` seconds until it acquires
        lock or exceeds `self.timeout` and raises an `~AcquisitionError`.

        """
        start = time.time()
        while True:

            self._validate_lockfile()

            try:
                fd = os.open(self.lockfile, os.O_CREAT | os.O_EXCL | os.O_RDWR)
                with os.fdopen(fd, 'w') as fd:
                    fd.write('{0}'.format(os.getpid()))
                break
            except OSError as err:
                if err.errno != errno.EEXIST:  # pragma: no cover
                    raise

                if self.timeout and (time.time() - start) >= self.timeout:
                    raise AcquisitionError('Lock acquisition timed out.')
                if not blocking:
                    return False
                time.sleep(self.delay)

        self._locked = True
        return True 

def open_pid():
    # Get the PID of this process
    # Exit if a version of the script is already running
    if os.path.isfile(PID_FILE):
        print_and_log("PID already open, exiting script", error=True)
        sys.exit(1)
    else:
        # Create the lock file for the script
        pid = str(os.getpid())
        open(PID_FILE, 'w').write(pid) 

def i_am_locking(self):
        """ Test if the lock is held by the current process.

        Returns ``True`` if the current process ID matches the
        number stored in the PID file.
        """
        return self.is_locked() and os.getpid() == self.read_pid() 

def __init__(self, path, threaded=True, timeout=None):
        """
        >>> lock = LockBase('somefile')
        >>> lock = LockBase('somefile', threaded=False)
        """
        super(LockBase, self).__init__(path)
        self.lock_file = os.path.abspath(path) + ".lock"
        self.hostname = socket.gethostname()
        self.pid = os.getpid()
        if threaded:
            t = threading.current_thread()
            # Thread objects in Python 2.4 and earlier do not have ident
            # attrs.  Worm around that.
            ident = getattr(t, "ident", hash(t))
            self.tname = "-%x" % (ident & 0xffffffff)
        else:
            self.tname = ""
        dirname = os.path.dirname(self.lock_file)

        # unique name is mostly about the current process, but must
        # also contain the path -- otherwise, two adjacent locked
        # files conflict (one file gets locked, creating lock-file and
        # unique file, the other one gets locked, creating lock-file
        # and overwriting the already existing lock-file, then one
        # gets unlocked, deleting both lock-file and unique file,
        # finally the last lock errors out upon releasing.
        self.unique_name = os.path.join(dirname,
                                        "%s%s.%s%s" % (self.hostname,
                                                       self.tname,
                                                       self.pid,
                                                       hash(self.path)))
        self.timeout = timeout 

def pseudo_tempname(self):
        """Return a pseudo-tempname base in the install directory.
        This code is intentionally naive; if a malicious party can write to
        the target directory you're already in deep doodoo.
        """
        try:
            pid = os.getpid()
        except Exception:
            pid = random.randint(0, sys.maxsize)
        return os.path.join(self.install_dir, "test-easy-install-%s" % pid)