1 /* Stack cache management for NPTL. 2 Copyright (C) 2002-2022 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. */ 28 extern size_t __nptl_stack_cache_maxsize attribute_hidden; 29 30 /* Check whether the stack is still used or not. */ 31 static inline bool __nptl_stack_in_use(struct pthread * pd)32__nptl_stack_in_use (struct pthread *pd) 33 { 34 return pd->tid <= 0; 35 } 36 37 /* Remove the stack ELEM from its list. */ 38 void __nptl_stack_list_del (list_t *elem); 39 libc_hidden_proto (__nptl_stack_list_del) 40 41 /* Add ELEM to a stack list. LIST can be either &GL (dl_stack_used) 42 or &GL (dl_stack_cache). */ 43 void __nptl_stack_list_add (list_t *elem, list_t *list); 44 libc_hidden_proto (__nptl_stack_list_add) 45 46 /* Free allocated stack. */ 47 extern void __nptl_deallocate_stack (struct pthread *pd); 48 libc_hidden_proto (__nptl_deallocate_stack) 49 50 /* Free stacks until cache size is lower than LIMIT. */ 51 void __nptl_free_stacks (size_t limit) attribute_hidden; 52 53 /* Compute the size of the static TLS area based on data from the 54 dynamic loader. */ 55 static inline size_t __nptl_tls_static_size_for_stack(void)56__nptl_tls_static_size_for_stack (void) 57 { 58 return roundup (GLRO (dl_tls_static_size), GLRO (dl_tls_static_align)); 59 } 60 61 #endif /* _NPTL_STACK_H */ 62