Experimental Physics and
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<== Date ==>		<== Thread ==>

Subject:	Pointer corruption on Windows
From:	"Koennecke Mark \(PSI\) via Tech-talk" <[email protected]>
To:	"[email protected]" <[email protected]>
Date:	Wed, 31 Jul 2019 07:41:46 +0000

Hi,

I am trying to write a motor record driver for the PXI7344 motor controller from

National Instruments and I am experiencing a weird pointer corruption problem.

First the environment:

- Windows 10, PSI computer security wants that

- MS Visual Studio 2010, I have to interface with the NI FlexMotion library which is EOL and from

this time

- base-3-14-12

- asyn4-25

- motorR6-9

I am using the asynMotorController. What I see in my debugger is that everything is fine with my

pointer until epicsEventSignal(pollEventId_) is called in asynMotorController::wakeupPoller().

After that call my this pointer is corrupted and everything goes downhill from then. I tried to

override wakeupPoller() to an empty method in order to get more information but then

I get the pointer corruption on the call to epicsEventWaitWithTimeout(pollEventId_, timeout) in

asynMotorController::asynMotorPoller()

Any ideas what could be wrong here?

Best Regards,

Mark Koennecke

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ANJ, 07 Aug 2019