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How to use _acquire_send_lock method in fMBT

Best Python code snippet using fMBT_python

__init__.py

Source:__init__.py

...59            except (socket.error, IOError):60                pass61def _send(msg, destination, acquire_send_lock=True, pickle=True):62    if acquire_send_lock:63        _acquire_send_lock(destination)64    try:65        if pickle:66            cPickle.dump(msg, destination, 2)67        else:68            destination.write(msg)69        destination.flush()70    finally:71        if acquire_send_lock:72            _release_send_lock(destination)73_send.locks = {}74def _send_opt(msg, destination, recv_caps, acquire_send_lock=True):75    data = cPickle.dumps(msg, 2)76    data_length = len(data)77    if data_length < _SEND_OPT_MESSAGE_MIN:78        _send(data, destination, acquire_send_lock=acquire_send_lock, pickle=False)79        return None80    if recv_caps & messages.RECV_CAP_COMPRESSION:81        # Try if compressing makes sense. For instance, at least 20 %82        # compression could be required for the first block to compress83        # everything.84        compress_block_len = min(data_length, _SEND_OPT_COMPRESS_TRIAL)85        compressed_block = zlib.compress(data[:compress_block_len],86                                         _SEND_OPT_COMPRESSION_LEVEL)87        if len(compressed_block) < compress_block_len * _SEND_OPT_COMPRESS_MIN:88            _uncompressed_data_length = data_length89            if compress_block_len == data_length:90                # everything got compressed for trial91                data = compressed_block92            else:93                # only first bytes were compressed in trial, compress all now94                data = zlib.compress(data, _SEND_OPT_COMPRESSION_LEVEL)95            data_length = len(data)96            compression_info = "compressed(%s)" % (_uncompressed_data_length,)97        else:98            compression_info = "no_compression"99    else:100        compression_info = "no_compression"101    data_info = messages.Data_info(102        data_type="Exec_rv",103        data_length=data_length,104        data_format=compression_info + ",pickled,allinone")105    if acquire_send_lock:106        _acquire_send_lock(destination)107    try:108        _send(data_info, destination, acquire_send_lock=False)109        bytes_sent = 0110        while bytes_sent < data_length:111            block_len = min(_SEND_OPT_BLOCK_SIZE, data_length-bytes_sent)112            data_block = data[bytes_sent:bytes_sent+block_len]113            # this may raise socket.error, let it raise through114            destination.write(data_block)115            destination.flush()116            bytes_sent += block_len117    finally:118        _release_send_lock(destination)119    return data_info120def _recv(source, acquire_recv_lock=True):121    """returns the first message from source"""122    if acquire_recv_lock:123        _acquire_recv_lock(source)124    try:125        try:126            return cPickle.load(source)127        except (ValueError, cPickle.UnpicklingError), e:128            return messages.Unloadable(str(e))129        except EOFError:130            raise131        except socket.error, e:132            raise EOFError("socket.error: " + str(e))133        except AttributeError, e:134            # If another thread closes the connection between send/recv,135            # cPickle.load() may raise "'NoneType' has no attribute 'recv'".136            # Make this look like EOF (connection lost)137            raise EOFError(str(e))138        except Exception, e:139            return messages.Unloadable("load error %s: %s" % (type(e).__name__, e))140    finally:141        if acquire_recv_lock:142            _release_recv_lock(source)143_recv.locks = {}144def _recv_with_info(source, acquire_recv_lock=True):145    """returns the first payload message from source that may/may not be146    preceded by Data_info147    """148    if acquire_recv_lock:149        _acquire_recv_lock(source)150    try:151        msg = _recv(source, False)152        if not isinstance(msg, messages.Data_info):153            return msg154        data = source.read(msg.data_length)155        if len(data) != msg.data_length:156            raise EOFError()157        if "compressed(" in msg.data_format:158            data = zlib.decompress(data)159        try:160            return cPickle.loads(data)161        except (ValueError, cPickle.UnpicklingError), e:162            return messages.Unloadable(str(e))163        except Exception, e:164            return messages.Unloadable("load error %s: %s" % (type(e).__name__, e))165    finally:166        if acquire_recv_lock:167            _release_recv_lock(source)168def _forward(source, destination, data_length,169             acquire_send_lock=True,170             acquire_recv_lock=True):171    if acquire_recv_lock:172        _acquire_recv_lock(source)173    if acquire_send_lock:174        _acquire_send_lock(destination)175    destination_ok = True176    try:177        bytes_sent = 0178        bytes_read = 0179        forward_block_size = _SEND_OPT_BLOCK_SIZE180        while bytes_read < data_length:181            forward_block = source.read(182                min(forward_block_size, data_length - bytes_read))183            bytes_read += len(forward_block)184            if forward_block:185                if destination_ok:186                    try:187                        destination.write(forward_block)188                        destination.flush()189                        bytes_sent += len(forward_block)190                    except socket.error:191                        destination_ok = False192                        # must still keep reading everything from the source193            else:194                raise EOFError() # source run out of data195        return bytes_sent196    finally:197        if acquire_recv_lock:198            _release_recv_lock(source)199        if acquire_send_lock:200            _release_send_lock(destination)201def _acquire_recv_lock(source):202    if not source in _recv.locks:203        _recv.locks[source] = thread.allocate_lock()204    _recv.locks[source].acquire()205def _acquire_send_lock(destination):206    if not destination in _send.locks:207        _send.locks[destination] = thread.allocate_lock()208    _send.locks[destination].acquire()209def _release_recv_lock(source):210    try:211        _recv.locks[source].release()212    except thread.error:213        pass # already released214def _release_send_lock(destination):215    try:216        _send.locks[destination].release()217    except thread.error:218        pass # already released219_g_hooks = {}...

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