1/* Stack cache management for NPTL.
2 Copyright (C) 2002-2023 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#ifndef _NPTL_STACK_H
20#define _NPTL_STACK_H
21
22#include <nptl/descr.h>
23#include <ldsodefs.h>
24#include <list.h>
25#include <stdbool.h>
26
27/* Maximum size of the cache, in bytes. 40 MiB by default. */
28extern size_t __nptl_stack_cache_maxsize attribute_hidden;
29
30/* Should allow stacks to use hugetlb. (1) is default. */
31extern int32_t __nptl_stack_hugetlb;
32
33/* Check whether the stack is still used or not. */
34static inline bool
35__nptl_stack_in_use (struct pthread *pd)
36{
37 return pd->tid <= 0;
38}
39
40/* Remove the stack ELEM from its list. */
41void __nptl_stack_list_del (list_t *elem);
42libc_hidden_proto (__nptl_stack_list_del)
43
44/* Add ELEM to a stack list. LIST can be either &GL (dl_stack_used)
45 or &GL (dl_stack_cache). */
46void __nptl_stack_list_add (list_t *elem, list_t *list);
47libc_hidden_proto (__nptl_stack_list_add)
48
49/* Free allocated stack. */
50extern void __nptl_deallocate_stack (struct pthread *pd);
51libc_hidden_proto (__nptl_deallocate_stack)
52
53/* Free stacks until cache size is lower than LIMIT. */
54void __nptl_free_stacks (size_t limit) attribute_hidden;
55
56/* Compute the size of the static TLS area based on data from the
57 dynamic loader. */
58static inline size_t
59__nptl_tls_static_size_for_stack (void)
60{
61 return roundup (GLRO (dl_tls_static_size), GLRO (dl_tls_static_align));
62}
63
64#endif /* _NPTL_STACK_H */
65