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+.\" Hey Emacs! This file is -*- nroff -*- source.
+.\"
+.\" Copyright 2003 Abhijit Menon-Sen <ams@wiw.org>
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of this
+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\" 
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
+.\" the use of the information contained herein.  The author(s) may not
+.\" have taken the same level of care in the production of this manual,
+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\" 
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\"
+.TH GETTID 2 "2003-02-01" "Linux 2.4.20" "Linux Programmer's Manual"
+.SH NAME
+gettid \- get thread identification
+.SH SYNOPSIS
+.B #include <sys/types.h>
+.br
+.B #include <linux/unistd.h>
+.sp
+.B _syscall0(pid_t,gettid)
+.sp
+.B pid_t gettid(void);
+.SH DESCRIPTION
+\fBgettid\fP returns the thread ID of the current process. This is equal
+to the process ID (as returned by
+.BR getpid (2)),
+unless the process is part of a thread group (created by specifying
+the CLONE_THREAD flag to the
+.BR clone (2)
+system call). All processes in the same thread group
+have the same PID, but each one has a unique TID.
+.SH "RETURN VALUE"
+On success, returns the thread ID of the current process.
+.SH ERRORS
+This call is always successful.
+.SH "CONFORMING TO"
+\fBgettid\fP is Linux specific and should not be used in programs that
+are intended to be portable.
+.SH "SEE ALSO"
+.BR clone (2),
+.BR fork (2),
+.BR getpid (2)