1/* pthread_cond_destroy. Generic version.
2 Copyright (C) 2002-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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 <pthread.h>
20#include <pt-internal.h>
21
22int
23__pthread_cond_destroy (pthread_cond_t *cond)
24{
25 /* Set the wake request flag. */
26 unsigned int wrefs = atomic_fetch_or_acquire (&cond->__wrefs, 1);
27
28 __pthread_spin_wait (&cond->__lock);
29 if (cond->__queue)
30 {
31 __pthread_spin_unlock (&cond->__lock);
32 return EBUSY;
33 }
34 __pthread_spin_unlock (&cond->__lock);
35
36 while (wrefs >> 1 != 0)
37 {
38 __gsync_wait (__mach_task_self (), (vm_offset_t) &cond->__wrefs, wrefs,
39 0, 0, 0);
40 wrefs = atomic_load_acquire (&cond->__wrefs);
41 }
42 /* The memory the condvar occupies can now be reused. */
43
44 return 0;
45}
46
47weak_alias (__pthread_cond_destroy, pthread_cond_destroy);
48

source code of glibc/sysdeps/htl/pt-cond-destroy.c