Movatterモバイル変換

gettid(2) — Linux manual page

NAME \|LIBRARY \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ERRORS \|STANDARDS \|HISTORY \|NOTES \|SEE ALSO \|COLOPHON

gettid(2)                  System Calls Manualgettid(2)

NAME top

       gettid - get thread identification

LIBRARY top

       Standard C library (libc,-lc)

SYNOPSIS top

#define _GNU_SOURCE#include <unistd.h>pid_t gettid(void);

DESCRIPTION top

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 bygetpid(2)).  In a multithreaded process, all       threads have the same PID, but each one has a unique TID.  For       further details, see the discussion ofCLONE_THREADinclone(2).

RETURN VALUE top

       On success, returns the thread ID of the calling thread.

ERRORS top

       This call is always successful.

STANDARDS top

       Linux.

HISTORY top

       Linux 2.4.11, glibc 2.30.

NOTES top

       The thread ID returned by this call is not the same thing as a       POSIX thread ID (i.e., the opaque value returned bypthread_self(3)).       In a new thread group created by aclone(2) call that does not       specify theCLONE_THREADflag (or, equivalently, a new process       created byfork(2)), the new process is a thread group leader, and       its thread group ID (the value returned bygetpid(2)) is the same       as its thread ID (the value returned bygettid()).

COLOPHON top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17gettid(2)

Pages that refer to this page:kill(1), strace(1), capget(2), clone(2), F_GETSIG(2const), futex(2), getpid(2), get_robust_list(2), ioprio_set(2), PR_SET_NAME(2const), ptrace(2), sched_setaffinity(2), sched_setparam(2), sched_setscheduler(2), seccomp(2), set_tid_address(2), syscalls(2), timer_create(2), tkill(2), id_t(3type), pthread_self(3), sd_event_new(3), proc_pid_status(5), proc_pid_task(5), cgroups(7), cpuset(7), pthreads(7)