With your help, I managed to implement the lock mechanism :-D
But, after some tests, I realize I need to improve this mechanism.
I'm thinking in the following approach :
Instead of using a spinlock scalar, this object will be a leaf in a table.
But to do this, I will have to modify the handler for that table with the
following algorithm:
mainTable_handler(netsnmp_mib_handler *handler, ..)
{
If(column is the spinlockObject)
{
case MODE_SET_RESERVE1:
if ( spinLockValue != table.spinlockLeaf)
netsnmp_set_request_error(reqinfo, requests,
SNMP_ERR_WRONGVALUE);
break;
case MODE_SET_ACTION:
Table.spinlockLeaf ++;
}
}
Does this make any sense ? :-D
----- Original Message -----
From: "Dave Shield" <[EMAIL PROTECTED]>
To: "vsaavedra" <[EMAIL PROTECTED]>
Cc: <[email protected]>
Sent: Tuesday, October 23, 2007 3:48 PM
Subject: Re: Semaphore / Synchronizing write operations
> On 23/10/2007, vsaavedra <[EMAIL PROTECTED]> wrote:
> > When using a spinlock aproach, should I do :
> >
> > snmpset -v 2c -c public localhost SpinLockObject i 0 MyLeaf i 1
>
> No.
>
> First of all, the spinLockObject is a scalar object, so you need
> to give the OID of the (sole) instance - i.e. spinLockObject.0
>
> Secondly, you need to give the correct spin-lock value - not 0.
> Otherwise the SET will fail. That's the whole point of a spin-lock.
>
> I suggest you re-read the description of the TestAndIncr syntax
> (in the SNMPv2-TC MIB)
>
> Dave
>
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