pthread_equal(3p) — Linux manual page

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 (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(3p), pthread_self(3p)

       The Base Definitions volume of POSIX.1‐2017, pthread.h(0p)

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(3P)

Pages that refer to this page: pthread.h(0p), pthread_self(3p)

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