RE: devSNMP: Thread error?

["Kagarmanov, Albert" <albert.kagarmanov@desy.de>]

		Hi Andrew,
	Yes, it's clear that using
epicsThreadGetStackSize(epicsThreadStackBig) is much more universal than
pure constants as 10000 or 132096.
Small constant can cause warning (like we at DESY had before in our
SL2.6/R3.14.7.2, when we used stackSize=10000) or even error (like you
wrote).
Thank you for advice!
	I've already re-compile, test and add this your changing in our
DESY devSNMP download page 
(http://www-mks2.desy.de/content/e4/e40/e41/e12212/)

Best regards,
Albert

>-----Original Message-----
>From: Andrew Johnson [mailto:anj@aps.anl.gov] 
>Sent: Tuesday, November 14, 2006 4:58 PM
>To: Kagarmanov, Albert
>Cc: Bertrand H.J. Biritz; tech-talk@aps.anl.gov
>Subject: Re: devSNMP: Thread error?
>
>
>Albert,
>
>Kagarmanov, Albert wrote:
>> 	This is not a real error, it's warning from 
>pthread_attr_setstacksize 
>> system-call, which invoked in devSnmp.c in function
>> 		int epicsSnmpInit(int param)
>
>Actually it is an error, in the epicsSnmpInit() code.
>
>> It looks like 10000 stack-size is small enough for your Linux (See 
>> http://docs.sun.com/app/docs/doc/816-5137/6mba5vpja?a=view 
>for detail)
>> 
>> We've changed this size till 128K as it recommended in 
>> $EPICS/base/documentation/RELEASE_NOTES.html and don't have this 
>> warning. See our http://www-mks2.desy.de/content/e4/e40/e41/e12212/ 
>> for detail.
>
>The stackSize parameter to the epicsThreadCreate() call should 
>not be a 
>number as the sizes needed can be different on different 
>architectures. 
>  The epicsSnmpInit() function should be passing 
>epicsThreadGetStackSize() one of three values epicsThreadStackSmall, 
>epicsThreadStackMedium or epicsThreadStackBig according to how much 
>stack the thread is expected to need, and using the return value from 
>epicsThreadGetStackSize() as the parameter to 
>epicsThreadCreate(). As an 
>example, here's an excerpt from base/src/db/callback.c:
>
>     callbackTaskId[ind] = epicsThreadCreate(taskName, priority,
>         epicsThreadGetStackSize(epicsThreadStackBig),
>         (EPICSTHREADFUNC)callbackTask, &priorityValue[ind]);
>
>By using this approach, the problem should not arise in the 
>future as a 
>new architecture with a bigger or smaller stack requirement that gets 
>added to Base can adjust the absolute amount of memory 
>allocated to the 
>three sizes.
>
>My appologies if the wording in RELEASE_NOTES.html was confusing, and 
>the Application Developers Guide entry for epicsThreadCreate() 
>probably 
>didn't help much either; I have just revised both documents.
>
>- Andrew
>-- 
>There is considerable overlap between the intelligence of the 
>smartest bears and the dumbest tourists -- Yosemite National 
>Park Ranger
>