Re: Semaphore / Synchronizing write operations

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" <D.T.Shield@liverpool.ac.uk>
To: "vsaavedra" <vsaavedra@maisis.pt>
Cc: <net-snmp-users@lists.sourceforge.net>
Sent: Tuesday, October 23, 2007 3:48 PM
Subject: Re: Semaphore / Synchronizing write operations


> On 23/10/2007, vsaavedra <vsaavedra@maisis.pt> 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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