proc_pid_task(5) — Linux manual page

NAME | DESCRIPTION | SEE ALSO | COLOPHON

proc_pid_task(5)           File Formats Manual          proc_pid_task(5)

NAME         top

       /proc/pid/task/, /proc/tid/, /proc/thread-self/ - thread
       information

DESCRIPTION         top

       /proc/pid/task/ (since Linux 2.6.0)
              This is a directory that contains one subdirectory for
              each thread in the process.  The name of each subdirectory
              is the numerical thread ID (tid) of the thread (see
              gettid(2)).

              Within each of these subdirectories, there is a set of
              files with the same names and contents as under the
              /proc/pid directories.  For attributes that are shared by
              all threads, the contents for each of the files under the
              task/tid subdirectories will be the same as in the
              corresponding file in the parent /proc/pid directory
              (e.g., in a multithreaded process, all of the task/tid/cwd
              files will have the same value as the /proc/pid/cwd file
              in the parent directory, since all of the threads in a
              process share a working directory).  For attributes that
              are distinct for each thread, the corresponding files
              under task/tid may have different values (e.g., various
              fields in each of the task/tid/status files may be
              different for each thread), or they might not exist in
              /proc/pid at all.

              In a multithreaded process, the contents of the
              /proc/pid/task directory are not available if the main
              thread has already terminated (typically by calling
              pthread_exit(3)).

       /proc/tid/
              There  is a numerical subdirectory for each running thread
              that is not a thread group leader (i.e., a thread whose
              thread ID is not the same as its process ID); the
              subdirectory is named by the thread ID.  Each one of these
              subdirectories contains files and subdirectories exposing
              information about the thread with the thread ID tid.  The
              contents of these directories are the same as the
              corresponding /proc/pid/task/tid directories.

              The /proc/tid subdirectories are not visible when
              iterating through /proc with getdents(2) (and thus are not
              visible when one uses ls(1) to view the contents of
              /proc).  However, the pathnames of these directories are
              visible to (i.e., usable as arguments in) system calls
              that operate on pathnames.

       /proc/thread-self/ (since Linux 3.17)
              This directory refers to the thread accessing the /proc
              filesystem, and is identical to the /proc/self/task/tid
              directory named by the process thread ID (tid) of the same
              thread.

SEE ALSO         top

       proc(5)

COLOPHON         top

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Linux man-pages 6.9.1          2024-05-02               proc_pid_task(5)