how kernel distinguish threads

["Feng Xian" <feng.xian@xxxxxxxxx>]

Hi, I am working on a project about reducing page faults of
multi-threaded programs. I am using latest Fedora core (Linux 2.6) and pthread library. In
this project, each user-level  thread (created by pthread_create()
function) needs to pass a value to the task structure in the kernel
which corresponds to the thread. The first step is getting a unique id
of the task structure of each thread. But what is this unique id? 

I tried to use getpid() to get the process id of each thread
and use it as unique id. But this didnt work out since all threads in a
process share the same pid. I tried to use the thread_id returned by
pthread_create() function but this id is meaningless to the kernel.
Could anyone help me out on this? Thanks!

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