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NAME | DESCRIPTION | SEE ALSO | COLOPHON |
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proc_pid_task(5) File Formats Manual proc_pid_task(5)
/proc/pid/task/, /proc/tid/, /proc/thread-self/ - thread
information
/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.
proc(5)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-05-17 proc_pid_task(5)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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