Experimental Physics and
Industrial Control System

Pete and Mark,
thanks for timely response. A tarball might be difficult to produce
because in addition to the soft IOC with SNL, it would also need
some DB in another IOC relating the strcmd strrsp PVs (in our case
they are linked via the PMAC driver sending strcmd content to PMAC
and posting response into strrsp). In any case the problem has been
resolved by adding either pvFlush() or using pvPut(str_cmd, SYNC)
per Lewis' suggestion (thanks Lewis!).
The weird thing is that such actions are not required with the same
code compiled under VxWorks: looks like the VxWorks and Linux
defaults are opposite.

Thanks everyone for help,

-- Sergey and Oleg.

Pete Jemian wrote:

Oleg:

I'd like the tarball as well to test. I see Sergey's Support Request Case HD12639 on this topic.

Pete

J. Lewis Muir wrote:

On 3/16/09 4:08 PM, Oleg Makarov wrote:

Hi Mark,

I tried the test with this fix. The problem is not resolved by

epicsThreadSleep code change in the osdThread.c.

CA requests are not being send out as they arise, some buffering of the

requests occurs to make network communication more efficient. If you
look at the camonitor output, it shows a 3-second period, exactly as
expected.

Are there way to force CA requests to go out as they arise, with no

buffering?

Hi, Oleg.

pvFlush() will flush the SEQ PV layer, but maybe that's not what you're
asking about.

You can also do a synchronous put:

  pvPut(str_cmd, SYNC);

But still, I don't understand why str_rsp would ever contain one of the
commands from str_cmd (e.g. "I522") like your output shows, unless
something is messed up with what's happening in and beyond "{dev}StrCmd"
and "{dev}StrRsp".

Lewis

Replies:

RE: weird behaviour of SNL test program running on Soft IOC on LINUX Mark Rivers

References:

weird behaviour of SNL test program running on Soft IOC on LINUX Oleg Makarov

RE: weird behaviour of SNL test program running on Soft IOC on LINUX Mark Rivers

Re: weird behaviour of SNL test program running on Soft IOC on LINUX Oleg Makarov

Re: weird behaviour of SNL test program running on Soft IOC on LINUX J. Lewis Muir

Re: weird behaviour of SNL test program running on Soft IOC on LINUX Pete Jemian

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