1/* Stack cache management for NPTL.
2 Copyright (C) 2002-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20#ifndef _NPTL_STACK_H
21#define _NPTL_STACK_H
22
23#include <nptl/descr.h>
24#include <ldsodefs.h>
25#include <list.h>
26#include <stdbool.h>
27
28/* Maximum size of the cache, in bytes. 40 MiB by default. */
29extern size_t __nptl_stack_cache_maxsize attribute_hidden;
30
31/* Check whether the stack is still used or not. */
32static inline bool
33__nptl_stack_in_use (struct pthread *pd)
34{
35 return pd->tid <= 0;
36}
37
38/* Remove the stack ELEM from its list. */
39void __nptl_stack_list_del (list_t *elem);
40libc_hidden_proto (__nptl_stack_list_del)
41
42/* Add ELEM to a stack list. LIST can be either &GL (dl_stack_used)
43 or &GL (dl_stack_cache). */
44void __nptl_stack_list_add (list_t *elem, list_t *list);
45libc_hidden_proto (__nptl_stack_list_add)
46
47/* Free allocated stack. */
48extern void __nptl_deallocate_stack (struct pthread *pd);
49libc_hidden_proto (__nptl_deallocate_stack)
50
51/* Free stacks until cache size is lower than LIMIT. */
52void __nptl_free_stacks (size_t limit) attribute_hidden;
53
54/* Compute the size of the static TLS area based on data from the
55 dynamic loader. */
56static inline size_t
57__nptl_tls_static_size_for_stack (void)
58{
59 return roundup (GLRO (dl_tls_static_size), GLRO (dl_tls_static_align));
60}
61
62#endif /* _NPTL_STACK_H */
63