What process manages XA transaction for Corba clients?

Hello,
what process manages the XA transactions on behalf of Corba clients?
Is it ISL itself? Or should there be a transaction manager associated with the group that includes ISL? Or is a TM automatically associated with the ISL?
Here is an excerpt of the ubbconfig:
*GROUPS
SYS_GRP
LMID = "s1"
GRPNO = 1200
APP_GRP
LMID = "s1"
GRPNO = 1300
OPENINFO= "Oracle_XA:..."
CLOSEINFO= "Oracle_XA:..."
TMSNAME = "TMS_ORA"
TMSCOUNT = 6
Q_GRP
LMID = "s1"
GRPNO = 3700
OPENINFO = "TUXEDO/QM..."
TMSNAME = TMS_QM
TMSCOUNT = 6
*SERVERS
ISL
SRVGRP = SYS_GRP
SRVID = 1010
CLOPT = "-A -- -O -n //s1:4101 -d /dev/tcp"
SEQUENCE = 140
MIN = 1
MAX = 1
TMQUEUE
SRVGRP = Q_GRP
SRVID = 3200
GRACE = 0
RESTART = Y
CONV = N
MAXGEN=10
CLOPT = "-s TuxQSPACE:TMQUEUE -- "
SEQUENCE = 180
MIN = 21
MAX = 21
SvrApp
SRVGRP = APP_GRP
SRVID = 6100
RESTART = Y
CLOPT = "-A -- ..."
SEQUENCE = 250
MIN = 9
MAX = 9
The client uses a Corba object in SvrApp. SvrApp uses the DB and a Tuxedo queue.
The client uses the TransactionCurrent object in the ISL to start and finish the transaction. SvrApp uses TMS_ORA to handle the DB part of the transaction, and TMQUEUE uses TMS_QM to handle the queue part of the transaction. What coordinates the overall transaction?
Thanks...
Roger

Hi Todd,
we have been able to collect system call information with tusc. It appears that at times the client process is spinning on a semop() call. We only have a few samples, and they show 0, for or 6 semop() calls just before the commit.
Here is an excerpt from the tusc log:
1307433992.346554 gettimeofday(0x7fffd0f8, NULL) .................................... = 0
1307433992.346685 write(13, "0 7 - 1 0 : 0 6 : 3 2 . 3 4 6 ".., 119) .............. = 119
1307433992.347194 semop(516140, 0x7fffd210, 1) ...................................... = 0
1307433992.348095 semop(516140, 0x7fffd250, 1) ...................................... = 0
1307433992.350263 semop(516140, 0x7fffd080, 1) ...................................... = 0
1307433992.350408 semop(516140, 0x7fffd0c0, 1) ...................................... = 0
1307433992.350495 time(NULL) ........................................................ = 1307433992
1307433992.351105 msgsnd(2414006, 0x406be6e8, 300, IPC_NOWAIT|0) .................... = 0
1307433992.351375 time(NULL) ........................................................ = 1307433992
1307433994.046557 msgrcv(2839780, "0 \0\005\0\0\0Z \0+ T e4\0\0\0\0".., 5476, 805306373, 0) = 248
1307433994.047046 gettimeofday(0x7fffd118, NULL) .................................... = 0
1307433994.047336 write(13, "0 7 - 1 0 : 0 6 : 3 4 . 0 4 7 ".., 115) .............. = 115
The writes to socket 13 are our debug logging. The timezone is GMT + 2; 1307433992 is 10:06:32. Below is our debug logging.
07-10:06:32.345 (InfXaTransactionManager.cpp@[InfXaTransactionManager] 99) Entering InfXaTransactionManager::commit
07-10:06:32.345 (InfXaTransactionManager.cpp@[InfXaTransactionManager] 55) Entering InfXaTransactionManager::getCurrent
07-10:06:32.346 (InfXaTransactionManager.cpp@[InfXaTransactionManager] 55) Leaving InfXaTransactionManager::getCurrent
07-10:06:34.047 (InfXaTransactionManager.cpp@[InfXaTransactionManager] 99) Leaving InfXaTransactionManager::commit
Roger

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I would like to know more about to CORBA clients (C++ & Java) accessing
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>
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