mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 17:53:37 +08:00
54 lines
2.2 KiB
C
54 lines
2.2 KiB
C
/* Recursive locking implementation for the dynamic loader. NPTL version.
|
|
Copyright (C) 2021-2024 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/>. */
|
|
|
|
/* Use the mutex implementation in libc (assuming PTHREAD_IN_LIBC). */
|
|
|
|
#include <assert.h>
|
|
#include <first-versions.h>
|
|
#include <ldsodefs.h>
|
|
|
|
__typeof (pthread_mutex_lock) *___rtld_mutex_lock attribute_relro;
|
|
__typeof (pthread_mutex_unlock) *___rtld_mutex_unlock attribute_relro;
|
|
|
|
void
|
|
__rtld_mutex_init (void)
|
|
{
|
|
/* There is an implicit assumption here that the lock counters are
|
|
zero and this function is called while nothing is locked. For
|
|
early initialization of the mutex functions this is true because
|
|
it happens directly in dl_main in elf/rtld.c, and not some ELF
|
|
constructor while holding loader locks. */
|
|
|
|
struct link_map *libc_map = GL (dl_ns)[LM_ID_BASE].libc_map;
|
|
|
|
const ElfW(Sym) *sym
|
|
= _dl_lookup_direct (libc_map, "pthread_mutex_lock",
|
|
0x4f152227, /* dl_new_hash output. */
|
|
FIRST_VERSION_libc_pthread_mutex_lock_STRING,
|
|
FIRST_VERSION_libc_pthread_mutex_lock_HASH);
|
|
assert (sym != NULL);
|
|
___rtld_mutex_lock = DL_SYMBOL_ADDRESS (libc_map, sym);
|
|
|
|
sym = _dl_lookup_direct (libc_map, "pthread_mutex_unlock",
|
|
0x7dd7aaaa, /* dl_new_hash output. */
|
|
FIRST_VERSION_libc_pthread_mutex_unlock_STRING,
|
|
FIRST_VERSION_libc_pthread_mutex_unlock_HASH);
|
|
assert (sym != NULL);
|
|
___rtld_mutex_unlock = DL_SYMBOL_ADDRESS (libc_map, sym);
|
|
}
|