Name
gettid — get thread identification
Synopsis
#include <sys/types.h>
pid_t
gettid( |
void); |
![[Note]](../stylesheet/note.png) |
Note |
|---|---|
| There is no glibc wrapper for this system call; see NOTES. |
DESCRIPTION
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
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 CLONE_THREAD in
clone(2).
CONFORMING TO
gettid() is Linux-specific
and should not be used in programs that are intended to be
portable.
NOTES
Glibc does not provide a wrapper for this system call; call it using syscall(2).
The thread ID returned by this call is not the same thing as a POSIX thread ID (i.e., the opaque value returned by pthread_self(3)).
In a new thread group created by a clone(2) call that does not
specify the CLONE_THREAD flag
(or, equivalently, a new process created by fork(2)), the new process
is a thread group leader, and its thread group ID (the value
returned by getpid(2)) is the same as
its thread ID (the value returned by gettid()).
SEE ALSO
capget(2), clone(2), fcntl(2), fork(2), get_robust_list(2), gettid(2), ioprio_set(2), perf_event_open(2), sched_setaffinity(2), sched_setparam(2), sched_setscheduler(2), tgkill(2), timer_create(2)
COLOPHON
This page is part of release 4.07 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright 2003 Abhijit Menon-Sen <amswiw.org> and Copyright (C) 2008 Michael Kerrisk <mtk.manpagesgmail.com> %%%LICENSE_START(VERBATIM) 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 Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date.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. %%%LICENSE_END |