Python threading._RLock() Examples

def init(with_threads=1):
    """Initialize threading.

    Don't bother calling this.  If it needs to happen, it will happen.
    """
    global threaded, _synchLockCreator, XLock

    if with_threads:
        if not threaded:
            if threadingmodule is not None:
                threaded = True

                class XLock(threadingmodule._RLock, object):
                    def __reduce__(self):
                        return (unpickle_lock, ())

                _synchLockCreator = XLock()
            else:
                raise RuntimeError("Cannot initialize threading, platform lacks thread support")
    else:
        if threaded:
            raise RuntimeError("Cannot uninitialize threads")
        else:
            pass 

def init(with_threads=1):
    """Initialize threading.

    Don't bother calling this.  If it needs to happen, it will happen.
    """
    global threaded, _synchLockCreator, XLock

    if with_threads:
        if not threaded:
            if threadingmodule is not None:
                threaded = True

                class XLock(threadingmodule._RLock, object):
                    def __reduce__(self):
                        return (unpickle_lock, ())

                _synchLockCreator = XLock()
            else:
                raise RuntimeError("Cannot initialize threading, platform lacks thread support")
    else:
        if threaded:
            raise RuntimeError("Cannot uninitialize threads")
        else:
            pass 

def init(with_threads=1):
    """Initialize threading.

    Don't bother calling this.  If it needs to happen, it will happen.
    """
    global threaded, _synchLockCreator, XLock

    if with_threads:
        if not threaded:
            if threadmodule is not None:
                threaded = True

                class XLock(threadingmodule._RLock, object):
                    def __reduce__(self):
                        return (unpickle_lock, ())

                _synchLockCreator = XLock()
            else:
                raise RuntimeError("Cannot initialize threading, platform lacks thread support")
    else:
        if threaded:
            raise RuntimeError("Cannot uninitialize threads")
        else:
            pass 

def init(with_threads=1):
    """Initialize threading.

    Don't bother calling this.  If it needs to happen, it will happen.
    """
    global threaded, _synchLockCreator, XLock

    if with_threads:
        if not threaded:
            if threadmodule is not None:
                threaded = True

                class XLock(threadingmodule._RLock, object):
                    def __reduce__(self):
                        return (unpickle_lock, ())

                _synchLockCreator = XLock()
            else:
                raise RuntimeError("Cannot initialize threading, platform lacks thread support")
    else:
        if threaded:
            raise RuntimeError("Cannot uninitialize threads")
        else:
            pass 

def __init__(self, *args):
            from OpenSSL import SSL as _ssl
            self._ssl_conn = apply(_ssl.Connection, args)
            from threading import _RLock
            self._lock = _RLock() 

def test_needs_underscored_versions(self):
        self.assertEqual(threading.Lock, threading._Lock)
        self.assertEqual(threading.RLock, threading._RLock) 

def __init__(self, *args):
            from OpenSSL import SSL as _ssl
            self._ssl_conn = apply(_ssl.Connection, args)
            from threading import _RLock
            self._lock = _RLock() 

def test_needs_underscored_versions(self):
        self.assertEqual(threading.Lock, threading._Lock)
        self.assertEqual(threading.RLock, threading._RLock) 

def getRst( self ):
        """
        Get data necessary for a restart of the running calculation.
        Locks, file handles and private data are *NOT* saved.
        Override if necessary but call this method in child method.

        @return: {..}, dict with 'pickleable' fields of master
        @rtype: dict
        """
        self.status.lock.acquire()

        ## collect master parameters that can be pickled
        rst = {}
        for k,v in self.__dict__.items():

            skip = 0
            for t in [ Thread, _RLock, _Condition, Status, file ]:
                if isinstance( v, t ):
                    skip = 1

            if str(k)[0] == '_':
                skip = 1

            if not skip:
                rst[k] = copy.copy( v )

        rst['status_objects'] = copy.deepcopy( self.status.objects )
        rst['master_class'] = self.__class__

        self.status.lock.release()

        return rst 

def test_needs_underscored_versions(self):
        self.assertEqual(threading.Lock, threading._Lock)
        self.assertEqual(threading.RLock, threading._RLock) 

def _safe_lock_release_py2(rlock):
  """Ensure that a threading.RLock is fully released for Python 2.

  The RLock release code is:
    https://github.com/python/cpython/blob/2.7/Lib/threading.py#L187

  The RLock object's release method does not release all of its state if an
  exception is raised in the middle of its operation.  There are three pieces of
  internal state that must be cleaned up:
  - owning thread ident, an integer.
  - entry count, an integer that counts how many times the current owner has
      locked the RLock.
  - internal lock, a threading.Lock instance that handles blocking.

  Args:
    rlock: threading.RLock, lock to fully release.

  Yields:
    None.
  """
  assert isinstance(rlock, threading._RLock)
  ident = _thread.get_ident()
  expected_count = 0
  if rlock._RLock__owner == ident:
    expected_count = rlock._RLock__count
  try:
    yield
  except ThreadTerminationError:
    # Check if the current thread still owns the lock by checking if we can
    # acquire the underlying lock.
    if rlock._RLock__block.acquire(0):
      # Lock is clean, so unlock and we are done.
      rlock._RLock__block.release()
    elif rlock._RLock__owner == ident and expected_count > 0:
      # The lock is still held up the stack, so make sure the count is accurate.
      if rlock._RLock__count != expected_count:
        rlock._RLock__count = expected_count
    elif rlock._RLock__owner == ident or rlock._RLock__owner is None:
      # The internal lock is still acquired, but either this thread or no thread
      # owns it, which means it needs to be hard reset.
      rlock._RLock__owner = None
      rlock._RLock__count = 0
      rlock._RLock__block.release()
    raise
# pylint: enable=protected-access