Fw: TestAndIncr problem

I'm sorry I wasn't very clear in my last question. I understand how a
TestAndIncr works.

I need a separate spinlock object for each row.

I managed to implement this behavior, with a modified version of the
netsnmp_setserialno_handler as seen in 'mibgroup/mibII/setSerialNo.c'  .



But I'm having a problem when trying to increment the spinlock object. In
the first time, everything works OK, but after that the spinlock object isn'
t incremented.



In the handler function, I do :



In the MODE_SET_RESERVE1 I check if the value passed is equal to the one
stored in the mib.If not, I return an error (as seen in
'mibgroup/mibII/setSerialNo.c'  )



In the MODE_SET_ACTION, I get the lockObject in the mib, increment it and
store the value in the mib:



case SPINLOCKCOLUMN:



 rowData = netsnmp_extract_table_row_data(request);

 data = netsnmp_table_data_set_find_column(rowData, SPINLOCKCOLUMN);


setspinLock = *((long *) data->data.voidp);

setspinLock++;

*((long*)data->data.voidp) =  setspinLock;



This works fine the firs time.

The following tries, the value isn't increased. I put a simple debug and it
shows :


In the first time :

setspinLock : before increment: 0

setspinLock : after increment: 1

*((long*)data->data.voidp) = 1



In the next try:



setspinLock : before increment: 1

setspinLock : after increment: 2

*((long*)data->data.voidp) = 2



But, if I do a snmpset to the lock object, the value returned is 1.





Thanks once more.





----- Original Message ----- 
From: "Dave Shield" <[email protected]>
To: "vsaavedra" <[email protected]>
Cc: <[email protected]>
Sent: Friday, January 18, 2008 5:02 PM
Subject: Re: TestAndIncr problem


> On 18/01/2008, vsaavedra <[email protected]> wrote:
> > I'm trying to implement a TestAndIncr object as a column in table.
>
> So you need a separate spinlock object for each row of the table?
> That feels a bit overkill - it's more common to have a single scalar
> TestAndIncr object that controls the whole table.
>
> There is a helper routine  netsnmp_register_watched_spinlock()
> which implements this behaviour (for a scalar MIB object).
> All you have to do is provide the integer variable to hold the spinlock
> value, and the helper does the rest.
>
> See 'mibgroup/mibII/setSerialNo.c' for an example of this.
>
> You might be able to use the helper's handler routine to implement
> a column-based version of this, if you really must work at the level
> of per-row granularity.
>
>
>
>
> > This table as an OCTET STRING column, and I want to be able to increment
the
> > TestAndIncr object,  if the column name is updated.
>
> That's not how TestAndIncr works.
> The value is incremented when the spinlock value itself is SET
(successfully).
> Not some other MIB object.
>
> Please re-read the description of this syntax type for the defined
behaviour.
>
>
> Dave
>
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