Data synchronize when calling another VI

[lvfanqie]

Saying I have A.vi and B.vi, A called B. I want to display a waveform in A and B is collecting data in a while loop.

The question is how the waveform is updated in real-time when B is running? I tried global variables but looks like A.vi is not in thread when calling B, so the data can't pass to A in real-time.

Any suggestions?

[Ben · Accepted solution]

You will want to search for "Producer/Consumer" for info on that design pattern. It consists of a Producer that shares data using an Action Engine or a queue to pass the data between the threads.

Another approach could make use of a control reference to the waveform display (chart or graph) and use "the "Vlaue" property to write to the display in a manner SIMILAR to just writing to the terminal.

Ben

[lvfanqie]

Thanks a lot. Control reference is a greate approch and easier in my case.