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.
The pthread_detach() function shall indicate to the implementation
that storage for the thread thread can be reclaimed when that thread
terminates. If thread has not terminated, pthread_detach() shall not
cause it to terminate.
The behavior is undefined if the value specified by the thread
argument to pthread_detach() does not refer to a joinable thread.
The pthread_join() or pthread_detach() functions should eventually be
called for every thread that is created so that storage associated
with the thread may be reclaimed.
It has been suggested that a ``detach'' function is not necessary;
the detachstate thread creation attribute is sufficient, since a
thread need never be dynamically detached. However, need arises in at
least two cases:
1. In a cancellation handler for a pthread_join() it is nearly
essential to have a pthread_detach() function in order to detach
the thread on which pthread_join() was waiting. Without it, it
would be necessary to have the handler do another pthread_join()
to attempt to detach the thread, which would both delay the
cancellation processing for an unbounded period and introduce a
new call to pthread_join(), which might itself need a
cancellation handler. A dynamic detach is nearly essential in
2. In order to detach the ``initial thread'' (as may be desirable in
processes that set up server threads).
If an implementation detects that the value specified by the thread
argument to pthread_detach() does not refer to a joinable thread, it
is recommended that the function should fail and report an [EINVAL]
If an implementation detects use of a thread ID after the end of its
lifetime, it is recommended that the function should fail and report
an [ESRCH] error.
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 http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
IEEE/The Open Group 2013 PTHREAD_DETACH(3P)