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.
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.
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.
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/>. */
22 #include "semaphoreP.h"
27 struct inuse_sem
*rec
;
31 walker (const void *inodep
, VISIT which
, void *closure0
)
33 struct walk_closure
*closure
= closure0
;
34 struct inuse_sem
*nodep
= *(struct inuse_sem
**) inodep
;
36 if (nodep
->sem
== closure
->the_sem
)
42 sem_close (sem_t
*sem
)
47 lll_lock (__sem_mappings_lock
, LLL_PRIVATE
);
49 /* Locate the entry for the mapping the caller provided. */
50 struct inuse_sem
*rec
;
52 struct walk_closure closure
= { .the_sem
= sem
, .rec
= NULL
};
53 __twalk_r (__sem_mappings
, walker
, &closure
);
58 /* Check the reference counter. If it is going to be zero, free
60 if (--rec
->refcnt
== 0)
62 /* Remove the record from the tree. */
63 (void) __tdelete (rec
, &__sem_mappings
, __sem_search
);
65 result
= munmap (rec
->sem
, sizeof (sem_t
));
72 /* This is no valid semaphore. */
77 /* Release the lock. */
78 lll_unlock (__sem_mappings_lock
, LLL_PRIVATE
);