Section: POSIX Programmer's Manual (3P)
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.
--- compare thread IDs
int pthread_equal(pthread_t t1, pthread_t t2);
This function shall compare the thread IDs
function shall return a non-zero value if
are equal; otherwise, zero shall be returned.
are not valid thread IDs, the behavior is undefined.
No errors are defined.
function shall not return an error code of
The following sections are informative.
Implementations may choose to define a
thread ID as a structure. This allows additional flexibility and
robustness over using an
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
function is provided to compare thread IDs.
The Base Definitions volume of POSIX.1-2008,
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
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