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

Subject: Asyn port locking
From: <[email protected]>
To: <[email protected]>
Date: Fri, 19 Feb 2010 16:40:16 -0000
Hello,
 
I am debugging a module that depends on tpmac and streamDevice.

Both streams and tpmac access an asyn port that communicate with a
serial device (non multi-address).

I use streams in the synchronous mode, that is I don't have I/O
interrupt records.

I found errors caused by clashes and found two different methods of
locking an asyn port

1) lockPort/unlockPort (used by tpmac via asynOctetSyncIO)
2) blockProcessCallback/unblockProcessCallback(used by streams via
queueRequest)

The error I saw originate from a request sent by streams, followed by a
request sent by tpmac, before streams gets its reply. This causes the
replies to get garbled.

Is the lockPort/unlockPort method compatible with
blockProcessCallback/unblockProcessCallback ?

Thanks,

Ronaldo

Dr Ronaldo Mercado
Software Systems Engineer Photon Beamlines 
Phone: +44 (0)1235-778486 Mobile 07887 832623
Diamond Light Source Fax: +44 (0)1235-446713
Diamond House, Harwell Science and Innovation Campus, Didcot,
Oxfordshire, OX11 0DE
 
e-mail: [email protected]

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RE: Asyn port locking matthew.pearson

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