Lock Synchronization

[Elfernro]

Hello,
I have a sequence that works in parallel mode with test sockets. All are using a DAQ, whose subvi are with "Clone execution" (VI Properties/Execution/Reentrancy), despite this I have errors that the source is reserved.
In the Steps that use this DAQ subvis in "properties"/"Synchronization" I have selected the "Use Lock to allow Only Thread at a Time to Execute the Step" with the same Lock Name for all and in Batch Synchronization: "Serial(one thread at a time)", but I'm not sure if this is the right option or "Use sequence file at a time".
I have searched in the manual but I cannot find the different options in this case explained.
Can you please help me with this?

 

Thanks so much in advance!!

[Oli_Wachno]

I don't understand your case completely, but maybe the folloing might help:

- changing reentrancy settings on driver VIs will enable the VIs to be called in parallel, yet I doesn't make the hardware ressource available for all parallel threads at the same time). Reserved Resource error message indicates, that one thread/ execution has reserved the ressource while the others are denied access.

- The Synchronization Steps/ Options you are referring to are only functional with the Batch Model not with the Parallel .  In the Parallel Model, you have to use lock steps.

[Elfernro]

Hello Oli,

thank you very much for your response. So it's just doing the Lock for me? It doesn't matter what I am selecting in "Batch Synchronization",right?

Is this Lock in synchronization/Properties the same as the one used in "Insert Step"/"Synchronization/Lock?

thanks so much for your time!!

[Oli_Wachno · Accepted solution]

---

@Elfernro wrote:

Hello Oli,

thank you very much for your response. So it's just doing the Lock for me? It doesn't matter what I am selecting in "Batch Synchronization",right?

---

Exactly. Will be used only by the Batch Model

---

@Elfernro wrote:

Is this Lock in synchronization/Properties the same as the one used in "Insert Step"/"Synchronization/Lock?

thanks so much for your time!!

---

Same but different 😉

The Lock Property you can configure in the step settings only refers to this very step. If you need to include more than one step in a locked section, you better off defining a section by using dedicated Lock Steps.

Though I have to admit, I do prefer using explicit lock steps also for just a single one, since it doesn't hide the property somewhere in the step.

[Elfernro]

Now everything is clear. Thank you very much!!