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Linux 2.6 - man page for gettid (linux section 2)

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 por-
       table.

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_setparam(2),   sched_setscheduler(2),
       timer_create(2), tgkill(2)

COLOPHON
       This page is part of release 3.55 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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