[lkml]   [1996]   [Jul]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: proc fs and shared pids
    >Kernelthreads? They dont shre the same pid. Userthreads are not visible to
    >the kernel at all and therefore there is no proc entry.

    As I understand it, kernel threads are implemented in linux with
    clone(), and hence they *can* share the same PID. Whether this
    is a good idea is perhaps another matter.

    Just did some experimenting with clone() and the CLONE_PID flag.

    This creates a new process with the same process ID as the original
    process. The proc fs has two directory entries for this with the same
    i-number. (!) So I guess the status of one of the two processes can never
    be retrieved.

    IMHO this is yet another severe shortcoming of /proc. It would perhaps
    be better to create a device which you can read and then returns the
    status of all processes. I just wrote a module that does exactly that.
    Michiel Boland <>
    University of Nijmegen
    The Netherlands

     \ /
      Last update: 2005-03-22 13:38    [W:3.461 / U:0.272 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site