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How do I get the same thread id as supplied by 'ps -AL' in LWP column



Hi
 
I'm running 2.6.18-1.2786.fc6 and I'm trying to debug an extravagantly threaded program (sixteen separate threads, not my code). 
 
The problem I've got is that although each of the threads is uniquely identifiable using 'ps -AL' or '/proc/PID/task' (information which is also available on creation and destruction to gdb) I cannot get the same identifiers programmatically.  I've tried pthread_self() and syscall(_NR_gettid) but they just return the identifier of the initiating thread rather than the thread I'm calling them from.  This makes debugging extremely difficult, for example I can see from 'ps -AL' that some of the threads are doing the <defunct> zombie thing, but I don't know which ones they are.
 
Any suggestions
 
Thanks
 
John
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