Is the Modbus of CK3M thread-safe?

[11hours]

I upadte some data of "double" by saving them in ModbusBuffer.

The updating function code is some like below:

{
  double *g_modbus_buff  = (double*)(pshm->ModbusServerBuffer);
  g_modbus_buff[0] = something_i;
  g_modbus_buff[1] = something_ii;
  g_modbus_buff[2] = something_iii;
  g_modbus_buff[3] = something_iv;
  g_modbus_buff[4] = something_v;
  ......
}

I put the code in "Realtime Routines" directory, and call the code in "user_pid_ctrl".

Is there any potential risk of "thread-safety" problem when I read holding registers from PC continuously? After all the Servo Frequency is 20kHz, "user_pid_ctrl" running so fast. 

Or, on the other hand, if the read-write process is thread-safe, will the modbus function slow down the servo task?

Edited October 8 by 11hours

[steve.milici]

Modbus is a background task in Power PMAC, so if you have enabled the server sockets (Sys.ModbusServerEnable = 1) for the documented Modbus use then this will not function properly in Power PMAC "Realtime Routines".

[11hours]

2 hours ago, steve.milici said:

Modbus is a background task in Power PMAC, so if you have enabled the server sockets (Sys.ModbusServerEnable = 1) for the documented Modbus use then this will not function properly in Power PMAC "Realtime Routines".

thank you Steve, I will move this code to background.