1PTHREAD_DETACH(3P) POSIX Programmer's Manual PTHREAD_DETACH(3P)
2
6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
10
12 pthread_detach — detach a thread
13
15 #include <pthread.h>
16 int pthread_detach(pthread_t thread);
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20 The pthread_detach() function shall indicate to the implementation that
21 storage for the thread thread can be reclaimed when that thread termi‐
22 nates. If thread has not terminated, pthread_detach() shall not cause
23 it to terminate.
24 The behavior is undefined if the value specified by the thread argument
26 to pthread_detach() does not refer to a joinable thread.
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29 If the call succeeds, pthread_detach() shall return 0; otherwise, an
30 error number shall be returned to indicate the error.
31
33 The pthread_detach() function shall not return an error code of
34 [EINTR].
35 The following sections are informative.
37
39 None.
40
42 None.
43
45 The pthread_join() or pthread_detach() functions should eventually be
46 called for every thread that is created so that storage associated with
47 the thread may be reclaimed.
48 It has been suggested that a ``detach'' function is not necessary; the
50 detachstate thread creation attribute is sufficient, since a thread
51 need never be dynamically detached. However, need arises in at least
52 two cases:
53 1. In a cancellation handler for a pthread_join() it is nearly essen‐
55 tial to have a pthread_detach() function in order to detach the
56 thread on which pthread_join() was waiting. Without it, it would be
57 necessary to have the handler do another pthread_join() to attempt
58 to detach the thread, which would both delay the cancellation pro‐
59 cessing for an unbounded period and introduce a new call to
60 pthread_join(), which might itself need a cancellation handler. A
61 dynamic detach is nearly essential in this case.
62 2. In order to detach the ``initial thread'' (as may be desirable in
64 processes that set up server threads).
65 If an implementation detects that the value specified by the thread
67 argument to pthread_detach() does not refer to a joinable thread, it is
68 recommended that the function should fail and report an [EINVAL] error.
69 If an implementation detects use of a thread ID after the end of its
71 lifetime, it is recommended that the function should fail and report an
72 [ESRCH] error.
73
75 None.
76
78 pthread_join()
79 The Base Definitions volume of POSIX.1‐2017, <pthread.h>
81
83 Portions of this text are reprinted and reproduced in electronic form
84 from IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
85 table Operating System Interface (POSIX), The Open Group Base Specifi‐
86 cations Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of
87 Electrical and Electronics Engineers, Inc and The Open Group. In the
88 event of any discrepancy between this version and the original IEEE and
89 The Open Group Standard, the original IEEE and The Open Group Standard
90 is the referee document. The original Standard can be obtained online
91 at http://www.opengroup.org/unix/online.html .
92 Any typographical or formatting errors that appear in this page are
94 most likely to have been introduced during the conversion of the source
95 files to man page format. To report such errors, see https://www.ker‐
96 nel.org/doc/man-pages/reporting_bugs.html .
97IEEE/The Open Group 2017 PTHREAD_DETACH(3P)