• 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
  
  This page is part of release 3.19 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/.

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