gettid(2)

1GETTID(2)                  Linux Programmer's Manual                 GETTID(2)
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NAME

6       gettid - get thread identification
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SYNOPSIS

9       #include <sys/types.h>
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11       pid_t gettid(void);
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DESCRIPTION

14       gettid()  returns  the  caller's thread ID (TID).  In a single-threaded
15       process, the thread ID is equal to the process ID (PID, as returned  by
16       getpid(2)).  In a multithreaded process, all threads have the same PID,
17       but each one has a unique TID.  For further details, see the discussion
18       of CLONE_THREAD in clone(2).
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RETURN VALUE

21       On success, returns the thread ID of the calling process.
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ERRORS

24       This call is always successful.
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VERSIONS

27       The gettid() system call first appeared on Linux in kernel 2.4.11.
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CONFORMING TO

30       gettid()  is Linux-specific and should not be used in programs that are
31       intended to be portable.
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NOTES

34       Glibc does not provide a wrapper for this system call;  call  it  using
35       syscall(2).
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37       The  thread  ID  returned by this call is not the same thing as a POSIX
38       thread ID (i.e., the opaque value returned by pthread_self(3)).
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COLOPHON

44       This page is part of release 3.25 of the Linux  man-pages  project.   A
45       description  of  the project, and information about reporting bugs, can
46       be found at http://www.kernel.org/doc/man-pages/.
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50Linux                             2008-04-14                         GETTID(2)