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

Subject: RE: devSNMP: Thread error?
From: "Kagarmanov, Albert" <[email protected]>
To: "Andrew Johnson" <[email protected]>
Cc: "Bertrand H.J. Biritz" <[email protected]>, <[email protected]>
Date: Tue, 14 Nov 2006 18:32:22 +0100
		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:[email protected]] 
>Sent: Tuesday, November 14, 2006 4:58 PM
>To: Kagarmanov, Albert
>Cc: Bertrand H.J. Biritz; [email protected]
>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
>


Replies:
Re: devSNMP: Thread error? Bertrand H.J. Biritz
References:
Re: devSNMP: Thread error? Andrew Johnson

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