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-.\" Copyright (C) 2004 Andries Brouwer (aeb@cwi.nl)
-.\"
-.\" 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-.\" manual page may be incorrect or out-of-date.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 SET_TID_ADDRESS 2 2004-09-10 "Linux" "Linux Programmer's Manual"
-.SH NAME
-set_tid_address \- set pointer to thread ID
-.SH SYNOPSIS
-.nf
-.B #include <linux/unistd.h>
-.sp
-.BI "long set_tid_address(int *" tidptr );
-.fi
-.SH DESCRIPTION
-The kernel keeps for each process two values called
-.I set_child_tid
-and
-.I clear_child_tid
-that are NULL by default.
-.SS set_child_tid
-If a process is started using
-.BR clone (2)
-with the
-.B CLONE_CHILD_SETTID
-flag,
-.I set_child_tid
-is set to
-.IR child_tidptr ,
-the fifth argument of that system call.
-.LP
-When
-.I set_child_tid
-is set, the very first thing the new process does
-is writing its PID at this address.
-.SS clear_child_tid
-If a process is started using
-.BR clone (2)
-with the
-.B CLONE_CHILD_CLEARTID
-flag,
-.I clear_child_tid
-is set to
-.IR child_tidptr ,
-the fifth argument of that system call.
-.LP
-The system call
-.BR set_tid_address ()
-sets the
-.I clear_child_tid
-value for the calling process to
-.IR tidptr .
-.LP
-When
-.I clear_child_tid
-is set, and the process exits, and the process was sharing memory
-with other processes or threads, then 0 is written at this address,
-and a
-.I futex(child_tidptr, FUTEX_WAKE, 1, NULL, NULL, 0);
-call is done.
-(That is, wake a single process waiting on this futex.)
-Errors are ignored.
-.SH "RETURN VALUE"
-.BR set_tid_address ()
-always returns the PID of the calling process.
-.SH ERRORS
-.BR set_tid_address ()
-always succeeds.
-.SH VERSIONS
-This call is present since Linux 2.5.48.
-Details as given here are valid since Linux 2.5.49.
-.SH "CONFORMING TO"
-This system call is Linux-specific.
-.SH "SEE ALSO"
-.BR clone (2),
-.BR futex (2)