1/* Copyright (C) 2002-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include "pthreadP.h"
21#include <atomic.h>
22
23
24int
25__pthread_detach (pthread_t th)
26{
27 struct pthread *pd = (struct pthread *) th;
28
29 /* Make sure the descriptor is valid. */
30 if (INVALID_NOT_TERMINATED_TD_P (pd))
31 /* Not a valid thread handle. */
32 return ESRCH;
33
34 int result = 0;
35
36 /* Mark the thread as detached. */
37 if (atomic_compare_and_exchange_bool_acq (&pd->joinid, pd, NULL))
38 {
39 /* There are two possibilities here. First, the thread might
40 already be detached. In this case we return EINVAL.
41 Otherwise there might already be a waiter. The standard does
42 not mention what happens in this case. */
43 if (IS_DETACHED (pd))
44 result = EINVAL;
45 }
46 else
47 /* Check whether the thread terminated meanwhile. In this case we
48 will just free the TCB. */
49 if ((pd->cancelhandling & EXITING_BITMASK) != 0)
50 /* Note that the code in __free_tcb makes sure each thread
51 control block is freed only once. */
52 __free_tcb (pd);
53
54 return result;
55}
56weak_alias (__pthread_detach, pthread_detach)
57