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-.\" Copyright 2003 Abhijit Menon-Sen <ams@wiw.org>
-.\" and Copyright (C) 2008 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH gettid 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-gettid \- get thread identification
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #define _GNU_SOURCE
-.B #include <unistd.h>
-.P
-.B pid_t gettid(void);
-.fi
-.SH DESCRIPTION
-.BR gettid ()
-returns the caller's thread ID (TID).
-In a single-threaded process, the thread ID
-is equal to the process ID (PID, as returned by
-.BR getpid (2)).
-In a multithreaded process, all threads
-have the same PID, but each one has a unique TID.
-For further details, see the discussion of
-.B CLONE_THREAD
-in
-.BR clone (2).
-.SH RETURN VALUE
-On success, returns the thread ID of the calling thread.
-.SH ERRORS
-This call is always successful.
-.SH STANDARDS
-Linux.
-.SH HISTORY
-Linux 2.4.11,
-glibc 2.30.
-.SH NOTES
-The thread ID returned by this call is not the same thing as a
-POSIX thread ID (i.e., the opaque value returned by
-.BR pthread_self (3)).
-.P
-In a new thread group created by a
-.BR clone (2)
-call that does not specify the
-.B CLONE_THREAD
-flag (or, equivalently, a new process created by
-.BR fork (2)),
-the new process is a thread group leader,
-and its thread group ID (the value returned by
-.BR getpid (2))
-is the same as its thread ID (the value returned by
-.BR gettid ()).
-.SH SEE ALSO
-.BR capget (2),
-.BR clone (2),
-.BR fcntl (2),
-.BR fork (2),
-.BR get_robust_list (2),
-.BR getpid (2),
-.\" .BR kcmp (2),
-.BR ioprio_set (2),
-.\" .BR move_pages (2),
-.\" .BR migrate_pages (2),
-.BR perf_event_open (2),
-.\" .BR process_vm_readv (2),
-.\" .BR ptrace (2),
-.BR sched_setaffinity (2),
-.BR sched_setparam (2),
-.BR sched_setscheduler (2),
-.BR tgkill (2),
-.BR timer_create (2)