Multithreading rs232 in CVI

[holly7787]

i'm doing in this way:

main thread -> numeric dial callback -> event val changed -> get lock -> set value to device -> release lock

second thread -> get lock -> read request -> read response -> release lock

[RobertoBozzolo]

What happens if you change from val changed to commit event?

[holly7787]

is the same.

now i have a lock that don't process event and the software freeze for a while and sometime doesn't change the value,

if i change the lock to process event the software don't freeze and sometime doesn't change the value

[holly7787]

it's not working bad with the process event lock, it's happen rarely. i think i can keep it in this way

[holly7787]

still have problem, i have this idea:

in the second thread create a switch case statement with this case:

request_value

wait_value

send_setpoint

in the main thread if i want to send the setpoint i set a flag and get in the right case

[RobertoBozzolo]

---

holly7787 ha scritto:

still have problem, i have this idea:

in the second thread create a switch case statement with this case:

request_value

wait_value

send_setpoint

in the main thread if i want to send the setpoint i set a flag and get in the right case

---

I don't understand exactly what you are saying with that: can you explain it a bit more detailed?

I would try changing the UI function this way:

Loop {
   TryToGetLock
      Exit if lock acquired
   ProcesSystemEvents
   Sleep (10)
}
Send command to device

Keep this function to the shortest possible.

This way the user interface remains responsive and you should be able to send the command to the remote device. It can be a problem if the user hits the dial too frequently.

[holly7787]

tried your way, i have to test it more but seems ok.

i was thinking to do something like this

while(quit)
{
    switch(function)
    {
        case request_read:
            comwrite
            go to wait_value function
            break;
        case wait_value:
            comread
            go to request_read
            break;
        case setpoint:
            break;
    }
}

UI callback
{
    go to setpoint function
}