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-.\" Copyright (C) 2004 Andries Brouwer (aeb@cwi.nl)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH set_tid_address 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-set_tid_address \- set pointer to thread ID
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.BR "#include <sys/syscall.h>" "      /* Definition of " SYS_* " constants */"
-.B #include <unistd.h>
-.P
-.BI "pid_t syscall(SYS_set_tid_address, int *" tidptr );
-.fi
-.P
-.IR Note :
-glibc provides no wrapper for
-.BR set_tid_address (),
-necessitating the use of
-.BR syscall (2).
-.SH DESCRIPTION
-For each thread, the kernel maintains two attributes (addresses) called
-.I set_child_tid
-and
-.IR clear_child_tid .
-These two attributes contain the value NULL by default.
-.TP
-.I set_child_tid
-If a thread is started using
-.BR clone (2)
-with the
-.B CLONE_CHILD_SETTID
-flag,
-.I set_child_tid
-is set to the value passed in the
-.I ctid
-argument of that system call.
-.IP
-When
-.I set_child_tid
-is set, the very first thing the new thread does
-is to write its thread ID at this address.
-.TP
-.I clear_child_tid
-If a thread is started using
-.BR clone (2)
-with the
-.B CLONE_CHILD_CLEARTID
-flag,
-.I clear_child_tid
-is set to the value passed in the
-.I ctid
-argument of that system call.
-.P
-The system call
-.BR set_tid_address ()
-sets the
-.I clear_child_tid
-value for the calling thread to
-.IR tidptr .
-.P
-When a thread whose
-.I clear_child_tid
-is not NULL terminates, then,
-if the thread is sharing memory with other threads,
-then 0 is written at the address specified in
-.I clear_child_tid
-and the kernel performs the following operation:
-.P
-.in +4n
-.EX
-futex(clear_child_tid, FUTEX_WAKE, 1, NULL, NULL, 0);
-.EE
-.in
-.P
-The effect of this operation is to wake a single thread that
-is performing a futex wait on the memory location.
-Errors from the futex wake operation are ignored.
-.SH RETURN VALUE
-.BR set_tid_address ()
-always returns the caller's thread ID.
-.SH ERRORS
-.BR set_tid_address ()
-always succeeds.
-.SH STANDARDS
-Linux.
-.SH HISTORY
-Linux 2.5.48.
-.P
-Details as given here are valid since Linux 2.5.49.
-.SH SEE ALSO
-.BR clone (2),
-.BR futex (2),
-.BR gettid (2)