Can't threads be executed in the remapping script?

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17 Dec 2021 12:17 #229284 by chen1234
I created a thread in the remapping code, but it cannot execute the loop in the thread.
I remapped a code to receive an external io signal. I need to read this signal in a loop for judgment, so I created a thread and let this loop execute in the thread. But when I tested this code, I found that it could not execute the function in this thread. I don't know why. My thread was created successfully. Hope someone can give me advice.
#!/usr/bin/env python3

import struct
import sys 
import os
from interpreter import *
import hal
import linuxcnc
import _thread



def Z_jogs(self,a):
        print('a = ',a)
        b=a
        print('b=',b)
        while True :
            x = hal.get_value('lcec.0.5.RXPDO-5') #read EtherCAT io  
            print('x_in5 =',x)
            if x == 1:
                print("in5 = ",x)
                self.execute("G0 Z %d"%b)    #Control Z axis movement
                b += a
            elif x == 0:
                print("in5 = ",x)
            if hal.get_value('lcec.0.5.TXPDO-2') == 1:   
                break 

# read EtherCAT io 
def m203(self,**words):
    yield INTERP_EXECUTE_FINISH
    if self.task:
        self.Z_jogs = Z_jogs()
        a = (words['s'])
        print("a=",a)
        try:
           _thread.start_new_thread(Z_jogs,(a,))
           print('qw')
        except:
           print('erro')

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17 Dec 2021 13:06 #229288 by andypugh
I haven't tried this, but I really wouldn't expect it to work.

Why do you want to start a thread? Can you explain what you are trying to do?

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20 Dec 2021 01:43 #229535 by chen1234
Thank you for your reply,
my job is like this: I need to control the Z-axis movement by receiving the feed signal of the scanning head.
It works as follows: When the device is in the hole-making state during operation, it will send a high-level signal to my EtherCAT board. When I receive this signal, I need to control the Z-axis movement for a specified distance. This high-level signal It is not continuous, so I need a thread to let it execute the read signal in a loop. But the problem I currently encounter is that the thread is successfully created and the function is not executed. Is the remapping code not supporting threads? Or is there another way?

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20 Dec 2021 03:17 #229536 by cmorley

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21 Dec 2021 20:47 #229652 by andypugh
You can probably do this with a custom HAL component and the external offsets feature.
linuxcnc.org/docs/2.8/html/motion/external-offsets.html

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