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



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 detec-
       tion  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,  Copyright  (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.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003                     PTHREAD_EQUAL(P)