Multiprocessing 2 sensors

[lixinghe1999]

I use two identical sensors with bus 1 and bus 6, all detected by i2cdetect and can run perfectly individually.
However, when I try to run them at the same time by multiprocessing, I get the below question. And such error can occur on both sensor.

I have no idea it is the problem of multiprocessing or quick2wire i2c. PLEASE help me if possible.

File "/usr/local/lib/python3.6/multiprocessing/process.py", line 258, in _bootstrap
self.run()
File "/usr/local/lib/python3.6/multiprocessing/process.py", line 93, in run
self._target(*self._args, **self._kwargs)
File "GY-85_Raspberry-Pi/datarecord.py", line 48, in acc_save
if adxl345.getInterruptStatus():
File "/home/pi/audioproject/GY-85_Raspberry-Pi/i2clibraries/i2c_adxl345.py", line 115, in getInterruptStatus
self.InterruptSource)
File "/home/pi/audioproject/GY-85_Raspberry-Pi/i2clibraries/i2c_adxl345.py", line 283, in getOptions
options_bin = self.bus.read_byte(register)
File "/home/pi/audioproject/GY-85_Raspberry-Pi/i2clibraries/i2c.py", line 19, in read_byte
reading(self.addr, 1))[0][0]
File "/home/pi/audioproject/quick2wire-python-api/quick2wire/i2c.py", line 78, in transaction
ioctl(self.fd, I2C_RDWR, ioctl_arg)
TimeoutError: [Errno 110] Connection timed out