PTHREAD_EQUAL(3P)                                   POSIX Programmer's Manual                                  PTHREAD_EQUAL(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       pthread_equal - compare thread IDs

SYNOPSIS
       #include <pthread.h>

       int pthread_equal(pthread_t t1, pthread_t t2);


DESCRIPTION
       This function shall compare the thread IDs t1 and t2.

RETURN VALUE
       The pthread_equal() function shall return a non-zero value if t1 and t2 are equal; otherwise, zero shall be returned.

       If either t1 or t2 are not valid thread IDs, the behavior is undefined.

ERRORS
       No errors are defined.

       The pthread_equal() function shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       Implementations  may  choose to define a thread ID as a structure. This allows additional flexibility and robustness over
       using an int. For example, a thread ID could include a sequence number that allows detection of "dangling IDs" (copies of
       a  thread  ID  that  has  been  detached).  Since  the  C  language  does  not support comparison on structure types, the
       pthread_equal() function is provided to compare thread IDs.

FUTURE DIRECTIONS
       None.

SEE ALSO
       pthread_create(), pthread_self(), the Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy  between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard  is  the  referee   document.   The   original   Standard   can   be   obtained   online   at   http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                             PTHREAD_EQUAL(3P)