Ivi_UnlockSession lockup

[pblase]

I found a weirdness with an Ivi driver that I'm writing:

When finished, during the xxx_close routine, the driver locked up on the Ivi_Dispose(vi) call. More disturbingly, the LabWindows/CVI force-break and force-termination wouldn't work. Turns out that I had a call to Ivi_UnlockSession  just before Ivi_Dispose, but had not initially called Ivi_LockSession first. When I put in the IviLockSession call things worked properly. Huh?

[NestorG]

Hi pblase,

This is expected behavior.
If you do not have a LockSession paired with the UnlockSession, the UnlockSession will continue to block the critical section - the Dispose() function. 

In fact, this pair is required as specified in the CVI Help Required Instrument Driver Functions.