Re: Asyn VXI-11 Driver and VXI-11 Locking

[Eric Norum <eric@norum.ca>]

Here's the code at the beginning of the vxiCreateDeviceLink routine.  As you can see, the lockDevice parameter is always set to 0.

static BOOL vxiCreateDeviceLink(vxiPort * pvxiPort,
    char *devName,Device_Link *pDevice_Link)
{
    enum clnt_stat   clntStat;
    Create_LinkParms crLinkP;
    Create_LinkResp  crLinkR;
    BOOL             rtnVal = FALSE;
    asynUser         *pasynUser = pvxiPort->pasynUser;

    crLinkP.clientId = (long) pvxiPort->rpcClient;
    crLinkP.lockDevice = 0;  /* do not try to lock the device */
    crLinkP.lock_timeout = 0;/* if device is locked, forget it */
    crLinkP.device = devName;
.
.
.


You could try setting lockDevice to 1 and see if this gets you the effect that you want.
I don't have my VXI-11 documents handy right now to see what happens if a client disappears suddenly (from a power-fail or such) without explicitly releasing the lock.


On Dec 2, 2010, at 9:10 AM, William Lu wrote:

> Hello,
> 
> I am using asyn records with the vxi-11 driver in a soft ioc to control the HP3458A GPIB devices through an ICS 8065 Ethernet-GPIB Controller.  I want to lock the devices using the vxi-11 locking so that the ioc has an exclusive access to the devices.  Does asyn vxi-11 driver or asyn record already provide the vxi-11 locking function for users to lock and unlock GPIB devices and if they do, how do I use them?
> 
> Best regards,
> William Lu
> 
> -- 
> Weiwei Lu
> 757-269-7476
> weiwei@jlab.org
> 

-- 
Eric Norum
eric@norum.ca