bionic (3) pthread_equal.3posix.gz

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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.1‐2008, <pthread.h>


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers,  Inc
       and  The  Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/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 .