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+.\" Copyright (C) 1994, 1995, Daniel Quinlan <quinlan@yggdrasil.com>
+.\" Copyright (C) 2002-2008, 2017, Michael Kerrisk <mtk.manpages@gmail.com>
+.\" Copyright (C) 2023, Alejandro Colomar <alx@kernel.org>
+.\"
+.\" SPDX-License-Identifier: GPL-3.0-or-later
+.\"
+.TH proc_pid_task 5 2023-08-15 "Linux man-pages 6.7"
+.SH NAME
+/proc/pid/task/, /proc/tid/, /proc/thread\-self/ \- thread information
+.SH DESCRIPTION
+.TP
+.IR /proc/ pid /task/ " (since Linux 2.6.0)"
+.\" Precisely: Linux 2.6.0-test6
+This is a directory that contains one subdirectory
+for each thread in the process.
+The name of each subdirectory is the numerical thread ID
+.RI ( tid )
+of the thread (see
+.BR gettid (2)).
+.IP
+Within each of these subdirectories, there is a set of
+files with the same names and contents as under the
+.IR /proc/ pid
+directories.
+For attributes that are shared by all threads, the contents for
+each of the files under the
+.IR task/ tid
+subdirectories will be the same as in the corresponding
+file in the parent
+.IR /proc/ pid
+directory
+(e.g., in a multithreaded process, all of the
+.IR task/ tid /cwd
+files will have the same value as the
+.IR /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
+.IR task/ tid
+may have different values (e.g., various fields in each of the
+.IR task/ tid /status
+files may be different for each thread),
+.\" in particular: "children" :/
+or they might not exist in
+.IR /proc/ pid
+at all.
+.IP
+.\" The following was still true as at kernel 2.6.13
+In a multithreaded process, the contents of the
+.IR /proc/ pid /task
+directory are not available if the main thread has already terminated
+(typically by calling
+.BR pthread_exit (3)).
+.TP
+.IR /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
+.IR tid .
+The contents of these directories are the same as the corresponding
+.IR /proc/ pid /task/ tid
+directories.
+.IP
+The
+.IR /proc/ tid
+subdirectories are
+.I not
+visible when iterating through
+.I /proc
+with
+.BR getdents (2)
+(and thus are
+.I not
+visible when one uses
+.BR ls (1)
+to view the contents of
+.IR /proc ).
+However, the pathnames of these directories are visible to
+(i.e., usable as arguments in)
+system calls that operate on pathnames.
+.TP
+.IR /proc/thread\-self/ " (since Linux 3.17)"
+.\" commit 0097875bd41528922fb3bb5f348c53f17e00e2fd
+This directory refers to the thread accessing the
+.I /proc
+filesystem,
+and is identical to the
+.IR /proc/self/task/ tid
+directory named by the process thread ID
+.RI ( tid )
+of the same thread.
+.SH SEE ALSO
+.BR proc (5)