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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 IEEE Std 1003.1-2001, <pthread.h>


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open  Group  Base
       Specifications Issue 6, Copyright (C) 2001-2003 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 .