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<== Date ==> <== Thread ==>

Subject: asynManager isConnected
From: <matthew.pearson@diamond.ac.uk>
To: <tech-talk@aps.anl.gov>
Date: Fri, 1 Jun 2012 11:17:09 +0000
Hi,

I'm trying to use asynManager isConnected() to test whether or not an IP port is connected to a device. But I'm finding that isConnected() only seems to report the connected status of the asynUser structure to the underlying device.

If I attempt to call drvAsynIPPort on an IP address that has nothing connected to it, the connection fails. Then I attempt to connect an asynUser to this port using asynOctetSyncIO connect(), which also fails. Then I call asynManager isConnected a few times, and I find that the first few calls return false, and then after iocInit it returns true. But still, in the background, asynManager is attempting to connect to the IP port via the autoConnect feature.

Is this behaviour correct? 

I can get around it by maintaining connected status myself. But the documentation seems to indicate that isConnected() shouldn't return true if the IP port is not connected.

Also, if I call asynOctetSyncIO writeRead, with a 5s timeout, I find it blocks forever if the IP port is not connected. 

Any ideas? 

Cheers,
Matt




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Replies:
RE: asynManager isConnected Mark Rivers
Re: asynManager isConnected J. Lewis Muir

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