diff options
Diffstat (limited to 'nptl')
| -rw-r--r-- | nptl/Makefile | 1 | ||||
| -rw-r--r-- | nptl/register-atfork.c | 150 |
2 files changed, 0 insertions, 151 deletions
diff --git a/nptl/Makefile b/nptl/Makefile index 33766eaf7a..e5d69e8858 100644 --- a/nptl/Makefile +++ b/nptl/Makefile @@ -74,7 +74,6 @@ routines = \ pthread_self \ pthread_setschedparam \ pthread_sigmask \ - register-atfork \ shared-only-routines = forward static-only-routines = pthread_atfork diff --git a/nptl/register-atfork.c b/nptl/register-atfork.c deleted file mode 100644 index 30c16fba40..0000000000 --- a/nptl/register-atfork.c +++ /dev/null @@ -1,150 +0,0 @@ -/* Copyright (C) 2002-2021 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. - - 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/>. */ - -#include <errno.h> -#include <stdlib.h> -#include <string.h> -#include <fork.h> -#include <atomic.h> - -#define DYNARRAY_ELEMENT struct fork_handler -#define DYNARRAY_STRUCT fork_handler_list -#define DYNARRAY_PREFIX fork_handler_list_ -#define DYNARRAY_INITIAL_SIZE 48 -#include <malloc/dynarray-skeleton.c> - -static struct fork_handler_list fork_handlers; -static bool fork_handler_init = false; - -static int atfork_lock = LLL_LOCK_INITIALIZER; - -int -__register_atfork (void (*prepare) (void), void (*parent) (void), - void (*child) (void), void *dso_handle) -{ - lll_lock (atfork_lock, LLL_PRIVATE); - - if (!fork_handler_init) - { - fork_handler_list_init (&fork_handlers); - fork_handler_init = true; - } - - struct fork_handler *newp = fork_handler_list_emplace (&fork_handlers); - if (newp != NULL) - { - newp->prepare_handler = prepare; - newp->parent_handler = parent; - newp->child_handler = child; - newp->dso_handle = dso_handle; - } - - /* Release the lock. */ - lll_unlock (atfork_lock, LLL_PRIVATE); - - return newp == NULL ? ENOMEM : 0; -} -libc_hidden_def (__register_atfork) - -static struct fork_handler * -fork_handler_list_find (struct fork_handler_list *fork_handlers, - void *dso_handle) -{ - for (size_t i = 0; i < fork_handler_list_size (fork_handlers); i++) - { - struct fork_handler *elem = fork_handler_list_at (fork_handlers, i); - if (elem->dso_handle == dso_handle) - return elem; - } - return NULL; -} - -void -__unregister_atfork (void *dso_handle) -{ - lll_lock (atfork_lock, LLL_PRIVATE); - - struct fork_handler *first = fork_handler_list_find (&fork_handlers, - dso_handle); - /* Removing is done by shifting the elements in the way the elements - that are not to be removed appear in the beginning in dynarray. - This avoid the quadradic run-time if a naive strategy to remove and - shift one element at time. */ - if (first != NULL) - { - struct fork_handler *new_end = first; - first++; - for (; first != fork_handler_list_end (&fork_handlers); ++first) - { - if (first->dso_handle != dso_handle) - { - *new_end = *first; - ++new_end; - } - } - - ptrdiff_t removed = first - new_end; - for (size_t i = 0; i < removed; i++) - fork_handler_list_remove_last (&fork_handlers); - } - - lll_unlock (atfork_lock, LLL_PRIVATE); -} - -void -__run_fork_handlers (enum __run_fork_handler_type who, _Bool do_locking) -{ - struct fork_handler *runp; - - if (who == atfork_run_prepare) - { - if (do_locking) - lll_lock (atfork_lock, LLL_PRIVATE); - size_t sl = fork_handler_list_size (&fork_handlers); - for (size_t i = sl; i > 0; i--) - { - runp = fork_handler_list_at (&fork_handlers, i - 1); - if (runp->prepare_handler != NULL) - runp->prepare_handler (); - } - } - else - { - size_t sl = fork_handler_list_size (&fork_handlers); - for (size_t i = 0; i < sl; i++) - { - runp = fork_handler_list_at (&fork_handlers, i); - if (who == atfork_run_child && runp->child_handler) - runp->child_handler (); - else if (who == atfork_run_parent && runp->parent_handler) - runp->parent_handler (); - } - if (do_locking) - lll_unlock (atfork_lock, LLL_PRIVATE); - } -} - - -libc_freeres_fn (free_mem) -{ - lll_lock (atfork_lock, LLL_PRIVATE); - - fork_handler_list_free (&fork_handlers); - - lll_unlock (atfork_lock, LLL_PRIVATE); -} |