Infrastructure Software

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