How do I get the LWP pid of linux threads?

I remember getpid() return different pid in seperated threads in redhat 7, but it return the same pid in redhat 9 and later. I think the latter should follows the POSIX thread specification, but I want the the old form reult now.

getpid() returns the process pid. POSIX-ly correct, all threads of a process execute under that process id, hence getpid() returning the same value. You wouldn't want it to make up values, or use the values of another process, would you?

I want to know which thread is the busiest one. but on the redhat9 the 'top' or 'ps' could only tell me the pid of differnce thread. and in the code I can got thread id only. I can't figure the mapping among them.

the follow is the output of 'ps -C npserver -m -o pid,tid,pcpu,tname,stat,psr,cmd'

  PID TID %CPU TTY    STAT PSR CMD
15489 -  0.1 ?        S      - /usr/local/bin/npserver
15490 -  0.0 ?        S      - /usr/local/bin/npserver
15492 -  0.0 ?        S      - /usr/local/bin/npserver
15493 -  0.0 ?        S      - /usr/local/bin/npserver
15494 -  0.0 ?        S      - /usr/local/bin/npserver
15495 -  0.0 ?        S      - /usr/local/bin/npserver
15496 -  0.0 ?        S      - /usr/local/bin/npserver
15497 -  0.0 ?        S      - /usr/local/bin/npserver
15498 -  0.0 ?        S      - /usr/local/bin/npserver

on Redhat AS4, I got the following output

  PID   TID %CPU TTY      STAT PSR CMD
14470     -  0.0 ?        -      - /usr/local/bin/npserver
    - 14470  0.0 -        Sl     0 -
    - 14471  0.0 -        Sl     0 -
    - 14472  0.0 -        Sl     0 -
    - 14473  0.0 -        Sl     0 -
    - 14474  0.0 -        Sl     0 -
    - 14475  0.1 -        Sl     0 -
    - 14476  0.0 -        Sl     0 -
    - 14477  0.0 -        Sl     0 -
    - 14478  0.0 -        Sl     0 -
    - 14480  0.0 -        Sl     0 -

How about putting something like this at the beginning of each thread?

printf("%s: Starting this thread[pid = %d] ...\n",
__FUNCTION__, getpid());

-bbeers

thanks£¬but the getpid() got the same value in all threads.
I have found it, the gettid() is just what I want£¬but in redhat 9, it could only be referenced by syscall() form.