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

12       pthread_equal - compare thread IDs
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SYNOPSIS

15       #include <pthread.h>
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17       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  detached).
47       Since  the  C  language does not support comparison on structure types,
48       the pthread_equal() function is provided to compare thread IDs.
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FUTURE DIRECTIONS

51       None.
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SEE ALSO

54       pthread_create(),  pthread_self(),  the  Base  Definitions  volume   of
55       IEEE Std 1003.1-2001, <pthread.h>
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58       Portions  of  this text are reprinted and reproduced in electronic form
59       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
60       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
61       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
62       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
63       event of any discrepancy between this version and the original IEEE and
64       The  Open Group Standard, the original IEEE and The Open Group Standard
65       is the referee document. The original Standard can be  obtained  online
66       at http://www.opengroup.org/unix/online.html .
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70IEEE/The Open Group                  2003                    PTHREAD_EQUAL(3P)
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