PTHREAD_EQUAL(P) POSIX Programmer's Manual PTHREAD_EQUAL(P)NAMEpthread_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 detec‐
tion 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 ALSOpthread_create() , pthread_self() , the Base Definitions volume of
IEEE Std 1003.1-2001, <pthread.h>
COPYRIGHT
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 .
IEEE/The Open Group 2003 PTHREAD_EQUAL(P)
