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SET_TID_ADDRESS
Section: Linux Programmer's Manual (2)
Updated: 2004-09-10
Index
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NAME
set_tid_address - set pointer to thread ID
SYNOPSIS
#include <linux/unistd.h>
long set_tid_address(int *tidptr);
DESCRIPTION
The kernel keeps for each process two values called
set_child_tid
and
clear_child_tid
that are NULL by default.
set_child_tid
If a process is started using
clone(2)
with the
CLONE_CHILD_SETTID
flag,
set_child_tid
is set to
child_tidptr,
the fifth argument of that system call.
When
set_child_tid
is set, the very first thing the new process does
is writing its PID at this address.
clear_child_tid
If a process is started using
clone(2)
with the
CLONE_CHILD_CLEARTID
flag,
clear_child_tid
is set to
child_tidptr,
the fifth argument of that system call.
The system call
set_tid_address()
sets the
clear_child_tid
value for the calling process to
tidptr.
When
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
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.
RETURN VALUE
set_tid_address()
always returns the PID of the calling process.
ERRORS
set_tid_address()
always succeeds.
VERSIONS
This call is present since Linux 2.5.48.
Details as given here are valid since Linux 2.5.49.
CONFORMING TO
This system call is Linux-specific.
SEE ALSO
clone(2),
futex(2)
COLOPHON
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- set_child_tid
-
- clear_child_tid
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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