diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/register-atfork.c')
-rw-r--r-- | nptl/sysdeps/unix/sysv/linux/register-atfork.c | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/register-atfork.c b/nptl/sysdeps/unix/sysv/linux/register-atfork.c deleted file mode 100644 index 2cc49540b9..0000000000 --- a/nptl/sysdeps/unix/sysv/linux/register-atfork.c +++ /dev/null @@ -1,145 +0,0 @@ -/* Copyright (C) 2002-2014 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 - <http://www.gnu.org/licenses/>. */ - -#include <errno.h> -#include <stdlib.h> -#include <string.h> -#include <fork.h> -#include <atomic.h> - - -/* Lock to protect allocation and deallocation of fork handlers. */ -int __fork_lock = LLL_LOCK_INITIALIZER; - - -/* Number of pre-allocated handler entries. */ -#define NHANDLER 48 - -/* Memory pool for fork handler structures. */ -static struct fork_handler_pool -{ - struct fork_handler_pool *next; - struct fork_handler mem[NHANDLER]; -} fork_handler_pool; - - -static struct fork_handler * -fork_handler_alloc (void) -{ - struct fork_handler_pool *runp = &fork_handler_pool; - struct fork_handler *result = NULL; - unsigned int i; - - do - { - /* Search for an empty entry. */ - for (i = 0; i < NHANDLER; ++i) - if (runp->mem[i].refcntr == 0) - goto found; - } - while ((runp = runp->next) != NULL); - - /* We have to allocate a new entry. */ - runp = (struct fork_handler_pool *) calloc (1, sizeof (*runp)); - if (runp != NULL) - { - /* Enqueue the new memory pool into the list. */ - runp->next = fork_handler_pool.next; - fork_handler_pool.next = runp; - - /* We use the last entry on the page. This means when we start - searching from the front the next time we will find the first - entry unused. */ - i = NHANDLER - 1; - - found: - result = &runp->mem[i]; - result->refcntr = 1; - result->need_signal = 0; - } - - return result; -} - - -int -__register_atfork (prepare, parent, child, dso_handle) - void (*prepare) (void); - void (*parent) (void); - void (*child) (void); - void *dso_handle; -{ - /* Get the lock to not conflict with other allocations. */ - lll_lock (__fork_lock, LLL_PRIVATE); - - struct fork_handler *newp = fork_handler_alloc (); - - if (newp != NULL) - { - /* Initialize the new record. */ - newp->prepare_handler = prepare; - newp->parent_handler = parent; - newp->child_handler = child; - newp->dso_handle = dso_handle; - - __linkin_atfork (newp); - } - - /* Release the lock. */ - lll_unlock (__fork_lock, LLL_PRIVATE); - - return newp == NULL ? ENOMEM : 0; -} -libc_hidden_def (__register_atfork) - - -void -attribute_hidden -__linkin_atfork (struct fork_handler *newp) -{ - do - newp->next = __fork_handlers; - while (catomic_compare_and_exchange_bool_acq (&__fork_handlers, - newp, newp->next) != 0); -} - - -libc_freeres_fn (free_mem) -{ - /* Get the lock to not conflict with running forks. */ - lll_lock (__fork_lock, LLL_PRIVATE); - - /* No more fork handlers. */ - __fork_handlers = NULL; - - /* Free eventually allocated memory blocks for the object pool. */ - struct fork_handler_pool *runp = fork_handler_pool.next; - - memset (&fork_handler_pool, '\0', sizeof (fork_handler_pool)); - - /* Release the lock. */ - lll_unlock (__fork_lock, LLL_PRIVATE); - - /* We can free the memory after releasing the lock. */ - while (runp != NULL) - { - struct fork_handler_pool *oldp = runp; - runp = runp->next; - free (oldp); - } -} |