1PTHREAD_EQUAL(3P)          POSIX Programmer's Manual         PTHREAD_EQUAL(3P)
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PROLOG

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

13       pthread_equal — compare thread IDs
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SYNOPSIS

16       #include <pthread.h>
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18       int pthread_equal(pthread_t t1, pthread_t t2);
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DESCRIPTION

21       This function shall compare the thread IDs t1 and t2.
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RETURN VALUE

24       The pthread_equal() function shall return a non-zero value if t1 and t2
25       are equal; otherwise, zero shall be returned.
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27       If either t1 or t2 are not valid thread IDs, the behavior is undefined.
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ERRORS

30       No errors are defined.
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32       The pthread_equal() function shall not return an error code of [EINTR].
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34       The following sections are informative.
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EXAMPLES

37       None.
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APPLICATION USAGE

40       None.
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RATIONALE

43       Implementations  may  choose to define a thread ID as a structure. This
44       allows additional flexibility and robustness over using  an  int.   For
45       example, a thread ID could include a sequence number that allows detec‐
46       tion of  ``dangling  IDs''  (copies  of  a  thread  ID  that  has  been
47       detached).  Since  the C language does not support comparison on struc‐
48       ture types, the pthread_equal() function is provided to compare  thread
49       IDs.
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FUTURE DIRECTIONS

52       None.
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SEE ALSO

55       pthread_create(), pthread_self()
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57       The Base Definitions volume of POSIX.1‐2008, <pthread.h>
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60       Portions  of  this text are reprinted and reproduced in electronic form
61       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
62       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
63       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
64       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
65       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
66       event of any discrepancy between this version and the original IEEE and
67       The Open Group Standard, the original IEEE and The Open Group  Standard
68       is  the  referee document. The original Standard can be obtained online
69       at http://www.unix.org/online.html .
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71       Any typographical or formatting errors that appear  in  this  page  are
72       most likely to have been introduced during the conversion of the source
73       files to man page format. To report such errors,  see  https://www.ker‐
74       nel.org/doc/man-pages/reporting_bugs.html .
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78IEEE/The Open Group                  2013                    PTHREAD_EQUAL(3P)
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