Experimental Physics and
Industrial Control System

Klemen Vodopivec via Tech-talk <[email protected]> · Tue, 28 May 2019 13:29:35 -0400

Hi,

while Mark focused on answering the crash, let me chip in about the

read-back not working.

It depends on your device implementation. In most simple case you may

want the same value that was pushed to writeInt32 to also show up in the

read-back record. This only reflects the fact that software has received

the requested value. Make sure to call setIntegerParam() followed by

callParamCallbacks(), or simply invoke asynPortDriver default

writeInt32() handler:

asynStatus MyDrv::writeInt32(asynUser *pasynUser, epicsInt32 value) {
  if (pasynUser->reason == BOARD_ID) {
    writeToDev(value);
    setIntegerParam(pasynUser->reason, value);
    callParamsCallbacks();
    return asynSuccess;
  }
  // rest of your code
}

or simply

asynStatus MyDrv::writeInt32(asynUser *pasynUser, epicsInt32 value) {
  if (pasynUser->reason == BOARD_ID) {
    writeToDev(value);
  }
  return asynPortDriver::writeInt32(pasynUser, value);
}

For this simple case you could also merge set-point and read-back

records into one by using asyn:READBACK.

What you probably want to do is to read value from the device. Once you

have the value, again make sure to use setIntegerParam() followed by

callParamCallbacks(). It's the callParamCallbacks() that schedules

processing of I/O Intr records.

-- Klemen

On 5/27/19 5:44 PM, Mark Rivers via Tech-talk wrote:

I forgot to CC tech-talk.

*From:*Mark Rivers
*Sent:* Monday, May 27, 2019 4:43 PM
*To:* 'Pilar' <[email protected]>
*Subject:* RE: I/O Intr scanning

Hi Pilar,

First, you have not provided enough information to let us help you

figure out the problem.  What is your driver doing when you write

BoardIDSet?  What you are trying to do should work, since there are lots

of other drivers that do the same sort of thing with no problems.

Second, you have set some compiler flags so that you are getting very

little useful information in your traceback.  It is not showing you the

line numbers, or demangling the C++ function names.

I have manually demangled the names of the last 3 functions called:

/home/epicsmgr/EPICS/support/asyn/lib/linux-x86_64/libasyn.so(_ZN8paramValD1Ev+0x11)[0x7f145d2d7611]

This is paramVal::~paramVal(), in asynPortDriver.

/home/xxx/bpm/bpm_epics/lib/linux-x86_64/libewbasyn.so(_ZN15EWBAsynGenPVPrmD0Ev+0x9)[0x7f145c09bec9]
This is EWBAsynGenPVPrm::~EWBAsynGenPVPrm(), in your class

/home/xxx/bpm/bpm_epics/lib/linux-x86_64/libewbasyn.so(_ZN15EWBAsynPortDrvr10writeToDevEii+0x4e)[0x7f145c09ad1e]
This is EWBAsynPortDrvr::writeToDev(int, int)

So your writeToDev function is calling the destructor for your

EWBAsynGenPVPrm object, which is in turn calling the destructor for the

paramVal object.  This seems unusual. What object are you destroying

when a new integer value is written to your driver?

You need a better traceback, and you will need to send your code if we

are to help.

Mark

*From:*[email protected]

<mailto:[email protected]> <[email protected]

<mailto:[email protected]>> *On Behalf Of *Pilar via Tech-talk

*Sent:* Monday, May 27, 2019 3:19 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* I/O Intr scanning

Dear all,

I'm using a asynPortDriver (4.33) with EPICS base (3.16).

The way I create my asynPortDriver is:

EWBAsynPortDrvr(const char *portName,int max_nprm)
: asynPortDriver(portName,
         1,

         (asynInt32Mask | asynFloat64Mask | asynOctetMask |

asynDrvUserMask), /* Interface mask */

         (asynInt32Mask | asynFloat64Mask | asynOctetMask), /* Interrupt

mask */

         0, /* asynFlags.  This driver does not block and it is not

multi-device, so flag is 0 */

         1, /* Autoconnect */
         0, /* Default priority */
         0), /* Default stack size*/

and I have one example PV defined as:

record(ao, "$(user):BoardIDSet")
{
     field(DTYP ,"asynInt32")
     field(OUT  ,"@asyn($(PORT),$(ADDR),$(TIMEOUT))board_ID")
     field(DESC ,"Board Identification")
     field(VAL , "3")
     field(LOPR, "0")
     field(HOPR, "5")
     field(PINI ,"YES")
}

record(ai, "$(user):BoardIDRdbk")
{
     field(DTYP ,"asynInt32")
     field(INP  ,"@asyn($(PORT),$(ADDR),$(TIMEOUT))board_ID")
     field(SCAN ,"I/O Intr")
     field(DESC ,"Board Identification")
}

If I set BoardIDSet to a certain value (for example: 3) BoardIDRdbk does

not see the change and it doesnt get updated. But if I try to write

again BoardIDSet following error ocurrs:

  Error in `/home/sevensols/bpm/bpm_epics/bin/linux-x86_64/AsynBPM7S':

double free or corruption (fasttop): 0x00000000023e1b70 ***

======= Backtrace: =========
/lib64/libc.so.6(+0x81489)[0x7f145ae31489]
/home/epicsmgr/EPICS/support/asyn/lib/linux-x86_64/libasyn.so(_ZN8paramValD1Ev+0x11)[0x7f145d2d7611]
/home/xxx/bpm/bpm_epics/lib/linux-x86_64/libewbasyn.so(_ZN15EWBAsynGenPVPrmD0Ev+0x9)[0x7f145c09bec9]
/home/xxx/bpm/bpm_epics/lib/linux-x86_64/libewbasyn.so(_ZN15EWBAsynPortDrvr10writeToDevEii+0x4e)[0x7f145c09ad1e]
/home/epicsmgr/EPICS/support/asyn/lib/linux-x86_64/libasyn.so(+0x37ae2)[0x7f145d2d8ae2]
/home/epicsmgr/EPICS/support/asyn/lib/linux-x86_64/libasyn.so(+0x44be5)[0x7f145d2e5be5]
/home/epicsmgr/EPICS/support/asyn/lib/linux-x86_64/libasyn.so(+0x16658)[0x7f145d2b7658]
/home/epicsmgr/EPICS/support/asyn/lib/linux-x86_64/libasyn.so(+0x45af9)[0x7f145d2e6af9]
/home/epicsmgr/EPICS/base/lib/linux-x86_64/libdbRecStd.so.3.16.1(+0xe998)[0x7f145ce3d998]
/home/epicsmgr/EPICS/base/lib/linux-x86_64/libdbCore.so.3.16.1(dbProcess+0x1d8)[0x7f145cbc4508]
/home/epicsmgr/EPICS/base/lib/linux-x86_64/libdbCore.so.3.16.1(dbPutField+0x3ce)[0x7f145cbc617e]
/home/epicsmgr/EPICS/base/lib/linux-x86_64/libdbCore.so.3.16.1(dbChannel_put+0x9e)[0x7f145cbe07fe]
/home/epicsmgr/EPICS/base/lib/linux-x86_64/libdbCore.so.3.16.1(+0x648a4)[0x7f145cc068a4]
/home/epicsmgr/EPICS/base/lib/linux-x86_64/libdbCore.so.3.16.1(camessage+0x9d)[0x7f145cc0515d]
/home/epicsmgr/EPICS/base/lib/linux-x86_64/libdbCore.so.3.16.1(camsgtask+0x13c)[0x7f145cc0203c]
/home/epicsmgr/EPICS/base/lib/linux-x86_64/libCom.so.3.16.1(+0x40b6c)[0x7f145c706b6c]

Can somebody tell me whay the I/O Scan is not working? And also why this

error ocurrs

Thank you very much in advance!

--

http://sevensols.com <http://sevensols.com>

Pilar Gil Jaldo

Embedded SW Engineer

This e-mail and any materials attached hereto, including, without

limitation, all content hereof and thereof are confidential and

proprietary to Seven Solutions,S.L and/or its affiliates, and are

**confidential**. Without the prior written consent of Seven Solutions,

this content may not (i) be disclosed to any third party, (ii) be

reproduced, modified or otherwise used by anyone other than current

employees of Seven Solutions or its affiliates. If you are not the

intended recipient or if this message has been received in error, please

immediately notify us via e-mail and delete it.

  This e-mail and any materials attached hereto, including, without

limitation, all content hereof and thereof are confidential and

proprietary to Seven Solutions,S.L and/or its affiliates, and are

*confidential*. Without the prior written consent of Seven Solutions,

this content may not (i) be disclosed to any third party, (ii) be

reproduced, modified or otherwise used by anyone other than current

employees of Seven Solutions or its affiliates. If you are not the

intended recipient or if this message has been received in error, please

notify us immediately via e-mail and delete it.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System