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Subject: RE: Stream Device: infinite loop when remote closes connection
From: Mazanec Tomáš <[email protected]>
To: "[email protected]" <[email protected]>, "[email protected]" <[email protected]>, "[email protected]" <[email protected]>
Date: Mon, 30 Nov 2015 10:01:59 +0000
Hi Ambroz

I see a resemblance to my disconnect/reconnect problems (http://www.aps.anl.gov/epics/tech-talk/2014/msg00605.php) regarding AsynDriverInterface.cc writeHandler(). 
If I recall correctly, the patches were applied to synApps SVN/GIT.

Cheers,
Tomas

________________________________________
Od: [email protected] [[email protected]] za uživatele [email protected] [[email protected]]
Odesláno: 25. listopadu 2015 20:07
Komu: [email protected]; [email protected]
Předmět: 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


Replies:
RE: Stream Device: infinite loop when remote closes connection Mark Rivers
References:
Stream Device: infinite loop when remote closes connection ambroz . bizjak

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