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, 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 .