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NAME

       gettid - get thread identification

SYNOPSIS

       #include <sys/types.h>

       pid_t gettid(void);

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

       clone(2), fork(2), getpid(2)

COLOPHON

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