| 1 | /* Stack cache management for NPTL. |
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| 2 | Copyright (C) 2002-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef _NPTL_STACK_H |
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| 20 | #define _NPTL_STACK_H |
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| 21 | |
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| 22 | #include <nptl/descr.h> |
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| 23 | #include <ldsodefs.h> |
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| 24 | #include <list.h> |
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| 25 | #include <stdbool.h> |
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| 26 | |
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| 27 | /* Maximum size of the cache, in bytes. 40 MiB by default. */ |
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| 28 | extern size_t __nptl_stack_cache_maxsize attribute_hidden; |
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| 29 | |
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| 30 | /* Should allow stacks to use hugetlb. (1) is default. */ |
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| 31 | extern int32_t __nptl_stack_hugetlb; |
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| 32 | |
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| 33 | /* Check whether the stack is still used or not. */ |
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| 34 | static inline bool |
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| 35 | __nptl_stack_in_use (struct pthread *pd) |
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| 36 | { |
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| 37 | return pd->tid <= 0; |
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| 38 | } |
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| 39 | |
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| 40 | /* Remove the stack ELEM from its list. */ |
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| 41 | void __nptl_stack_list_del (list_t *elem); |
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| 42 | libc_hidden_proto (__nptl_stack_list_del) |
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| 43 | |
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| 44 | /* Add ELEM to a stack list. LIST can be either &GL (dl_stack_used) |
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| 45 | or &GL (dl_stack_cache). */ |
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| 46 | void __nptl_stack_list_add (list_t *elem, list_t *list); |
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| 47 | libc_hidden_proto (__nptl_stack_list_add) |
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| 48 | |
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| 49 | /* Free allocated stack. */ |
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| 50 | extern void __nptl_deallocate_stack (struct pthread *pd); |
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| 51 | libc_hidden_proto (__nptl_deallocate_stack) |
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| 52 | |
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| 53 | /* Free stacks until cache size is lower than LIMIT. */ |
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| 54 | void __nptl_free_stacks (size_t limit) attribute_hidden; |
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| 55 | |
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| 56 | /* Compute the size of the static TLS area based on data from the |
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| 57 | dynamic loader. */ |
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| 58 | static inline size_t |
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| 59 | __nptl_tls_static_size_for_stack (void) |
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| 60 | { |
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| 61 | return roundup (GLRO (dl_tls_static_size), GLRO (dl_tls_static_align)); |
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| 62 | } |
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| 63 | |
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| 64 | #endif /* _NPTL_STACK_H */ |
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| 65 | |
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