proc_tid

proc_pid_task(5) File Formats Manual proc_pid_task(5)

NAME

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

DESCRIPTION

   /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 get
          tid(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 multi
          threaded  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 work
          ing 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 subdirec
          tory 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).  How
          ever, 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

   proc(5)

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