gettid man page on Oracle

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GETTID(2)		   Linux Programmer's Manual		     GETTID(2)

NAME
       gettid - get thread identification

SYNOPSIS
       #include <sys/types.h>

       pid_t gettid(void);

       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).

RETURN VALUE
       On success, returns the thread ID of the calling process.

ERRORS
       This call is always successful.

VERSIONS
       The gettid() system call first appeared on Linux in kernel 2.4.11.

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)).

SEE ALSO
       capget(2), clone(2), fcntl(2), fork(2), get_robust_list(2),  getpid(2),
       ioprio_set(2),	perf_event_open(2),  sched_setaffinity(2),  sched_set‐
       param(2), sched_setscheduler(2), timer_create(2), tgkill(2)

COLOPHON
       This page is part of release 3.53 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/.

Linux				  2013-02-04			     GETTID(2)
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