Elapsed time reset in producer consumer loop

[mirelche]

Hi, everyone!

I have a producer(event handler) and consumer(state machine) structure. One of my states says: display message, then wait 5 sec, then display something else, then wait 3 sec, etc, so I have 5 timers with countdowns using the Elapsed time vi. 

I also a have a function which is supposed to start this state all over again, so all the timers need to start at the initial time.

For some reason, this is not working, although I am using the reset function on the elapsed time.

Has someone done this before and now how to reset the timers in a producer consumer loop?

Best regards

[johntrich1971]

Perhaps if you included your code it would be more clear what you are trying to do. It sounds to me like you're wanting to start multiple timers simultaneously, but I may be misunderstanding. If this is the case perhaps you need to build your own elapsed time code - it's really simple.

[mirelche]

Hi, 

I want the timers to execute one after another, see attached VI and then reset.

Best regards

[mirelche]

Hi, 

I want the timers to execute one after another, see attached VI, and then reset.

Best regards

[RTSLVU · Accepted solution]

What is going on here? Why the Producer/Consumer architecture? Is this part of a larger program?

[crossrulz]

Your queue utilization is a COMPLETE mess and you therefore have race conditions and circular code.  You need to implement a proper state machine in your message handling loop.  DO NOT LET THE PRODUCER DIRECTLY SET THE STATE.  A little trick I do here is to use the queue timeout.  You can store the timeout in shift register so you can change it.  Set it to -1 to wait forever or some other value.  On a timeout (ie, you did not get a message), you perform the next state in your state machine.  If you got a message you handle it.  Use another shift register to set whether or not to reset your timers.

[altenbach]

All you probably need is an single while loop containing a case structure (or maybe an event structure containing a case structure in the timeout case).

[mirelche]

Yes, it is part of a larger program, where I need the producer consumer.

[mirelche]

I thought this is what I do with the timeout case in the event structure by enqueing the Wait state there...

[altenbach]

See if this can give you some ideas. (i.e. how to switch states after some time).