PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult 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 POSIX.1‐2017, <pthread.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1-2017,  Standard  for  Information Technology -- Portable Operating System Interface
       (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C)  2018  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 .

       Any typographical or formatting errors that appear in this page are most  likely  to  have
       been  introduced  during  the conversion of the source files to man page format. To report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .