On 30/10/2007, andre robalo <[EMAIL PROTECTED]> wrote:
> In all examples i saw, the use of a spin lock object is only by scalar
> objects.
> I have a situation where I need to use this concept, but applied to a table.
A spin lock is typically *implemented* as a scalar object,
but it's perfectly common to use that (scalar) spin lock to protect a table.
Just retrieve the scalar spinlock value at the same time as the table
contents that you are interested in - and then include the (scalar)
spinlock assignment as part of the update request:
$ snmpget localhost snmpSetSerialNo.0 ifAdminStatus.2
snmpSetSerialNo.0 = 12345
ifAdminStatus.2= up(1)
$ snmpset localhost snmpSetSerialNo.0 i 12345 ifAdminStatus.2 i 2
snmpSetSerialNo.0 = 12345
ifAdminStatus.2= down(2)
You could implement the spinlock as a column object, but there's
typically no real need.
> In this situation, i would have a table column that is a spinlock
> (testAndIncr object).
>
> My first question is : Is this possible ?
Yes - it is possible.
You probably can't use the spinlock helper, which is designed
to implement a scalar object. But there's nothing special about
the code. You could perfectly easily implement this as an
integer column object.
The only special thing about a TestAndIncr object, is the check
that the assigned value matches the current one, and incrementing
this value at the end of a successful SET request.
> Am I doing anything wrong in my code?
In general, this looks mostly OK.
Two things spring out though:
> case MODE_SET_ACTION:
> data =
> netsnmp_table_data_set_find_column(rowData,COLUMN_SPINLOCK);
> if(data != NULL)
> data->data.voidp ++;
Shouldn't you be incrementing the value that voidp points to,
rather than the pointer itself?
> else
> data->data.voidp = 0;
More seriously, if data is NULL, then you can't access data->data!
Dave
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