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/* Stack cache management for NPTL.
Copyright (C) 2002-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _NPTL_STACK_H
#define _NPTL_STACK_H
#include <nptl/descr.h>
#include <ldsodefs.h>
#include <list.h>
#include <stdbool.h>
/* Maximum size of the cache, in bytes. 40 MiB by default. */
extern size_t __nptl_stack_cache_maxsize attribute_hidden;
/* Should allow stacks to use hugetlb. (1) is default. */
extern int32_t __nptl_stack_hugetlb;
/* Check whether the stack is still used or not. */
static inline bool
__nptl_stack_in_use (struct pthread *pd)
{
return pd->tid <= 0;
}
/* Remove the stack ELEM from its list. */
void __nptl_stack_list_del (list_t *elem);
libc_hidden_proto (__nptl_stack_list_del)
/* Add ELEM to a stack list. LIST can be either &GL (dl_stack_used)
or &GL (dl_stack_cache). */
void __nptl_stack_list_add (list_t *elem, list_t *list);
libc_hidden_proto (__nptl_stack_list_add)
/* Free allocated stack. */
extern void __nptl_deallocate_stack (struct pthread *pd);
libc_hidden_proto (__nptl_deallocate_stack)
/* Free stacks until cache size is lower than LIMIT. */
void __nptl_free_stacks (size_t limit) attribute_hidden;
/* Compute the size of the static TLS area based on data from the
dynamic loader. */
static inline size_t
__nptl_tls_static_size_for_stack (void)
{
return roundup (GLRO (dl_tls_static_size), GLRO (dl_tls_static_align));
}
#endif /* _NPTL_STACK_H */
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