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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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