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



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

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 .



IEEE/The Open Group                  2017                     PTHREAD_EQUAL(3)
