PTHREAD_DETACH(3P)          POSIX Programmer's Manual         PTHREAD_DETACH(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.

       pthread_detach — detach a thread

       #include <pthread.h>

       int pthread_detach(pthread_t thread);

       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.

       If the call succeeds, pthread_detach() shall return 0; otherwise, an
       error number shall be returned to indicate the error.

       The pthread_detach() function shall not return an error code of [EINTR].

       The following sections are informative.



       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

        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 this case.

        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] error.

       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.



       The Base Definitions volume of POSIX.1‐2017, <pthread.h>

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       Any typographical or formatting errors that appear in this page are most
       likely to have been introduced during the conversion of the source files
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IEEE/The Open Group                   2017                    PTHREAD_DETACH(3P)