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Subject: RE: Stream Device: infinite loop when remote closes connection
From: Mark Rivers <[email protected]>
To: "'[email protected]'" <[email protected]>, "[email protected]" <[email protected]>, "[email protected]" <[email protected]>
Date: Wed, 25 Nov 2015 19:22:40 +0000
I would recommend changing it to:

    } while (status == asynSuccess);

That way it is robust against other types of errors being returned.

Mark

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of [email protected]
Sent: Wednesday, November 25, 2015 1:08 PM
To: [email protected]; [email protected]
Subject: Stream Device: infinite loop when remote closes connection

Hello all, Dirk,

I've found a bug in StreamDevice asynDriver code. In my case, whenever the remote TCP host closes connection, a thread in EPICS will enter an infinite loop, the connection failure will never be reported, and reconnection will never be attempted. I've tracked it down to this code in AsynDriverInterface.cc:

// now, we can write (called by asynManager)
void AsynDriverInterface::
writeHandler()
{
...
    } while (status != asynTimeout);
...

I observed that the read returns asynError and this loop continues forever. I was able to fix it by changing this line to:

    } while (status != asynTimeout && status != asynError);

Now it appears to be working correctly, the connection error is reported and reconnection works.

Best regards,
Ambroz Bizjak


References:
Stream Device: infinite loop when remote closes connection ambroz . bizjak

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