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Multithreading issue on Solaris 8 branded zone

807559Sep 14 2009
Hi,

We are facing a multithreading problem in Solaris 8 container (branded zone) on Solaris 10.

The core file shows 2 LWPs for a single thread.

First LWP
---------------
(dbx) lwp
current LWP ($lwp) is l@1403
(dbx) print this->m_ThreadId->m_IdImpl.m_PosixId
this->m_ThreadId.m_IdImpl.m_PosixId = 1404U

Second LWP
-------------------
(dbx) lwp
current LWP ($lwp) is l@1404
(dbx) print this->m_ThreadId->m_IdImpl.m_PosixId
this->m_ThreadId.m_IdImpl.m_PosixId = 1404U

Another point to note is that dbx returns 'MT support is disabled' for this program even though it has been built using the -mt option. The dbx version is Sun Dbx Debugger 7.5 2005/10/13.

As far as I have read, the Solaris 8 branded zone uses the alternate T2 thread library. Note also that this program is linked with the alternate thread library @ /usr/lib/lwp.

This alternate thread library is supposed to use the 1:1 thread model.
Can someone explain why are we then seeing 2 LWPs for a single thread ?

Thanks,
Best regards,
Raj Iyer

Comments

user434854
Is a Parameter list beeing transmitted to the report ?

If yes, try :

ADD_PARAMETER(v_list_id, 'PARAMFORM', TEXT_PARAMETER, 'YES');

Maybe you need to explicitely set this parameter in the report when calling it through the run_report_object built-in.
1 person found this helpful
708420
A parameter list is not currently being sent, but i can try to create a parameter list and send the one you suggest. I'll see how that works.

Thanks!
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Post Details

Locked on Oct 12 2009
Added on Sep 14 2009
#oracle-solaris, #solaris-zones
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