malloc/thread-freeres.c

   1 /* Free resources stored in thread-local variables on thread exit.
   2    Copyright (C) 2003-2022 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 #include <dlfcn/dlerror.h>
  20 #include <libc-internal.h>
  21 #include <malloc-internal.h>
  22 #include <resolv/resolv-internal.h>
  23 #include <rpc/rpc.h>
  24 #include <string.h>
  25 #include <tls-internal.h>
  26 #include <shlib-compat.h>
  27
  28 /* Thread shutdown function.  Note that this function must be called
  29    for threads during shutdown for correctness reasons.  Unlike
  30    __libc_subfreeres, skipping calls to it is not a valid optimization.
  31    This is called directly from pthread_create as the thread exits.  */
  32 void
  33 __libc_thread_freeres (void)
  34 {
  35 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_32)
  36   __rpc_thread_destroy ();
  37 #endif
  38   call_function_static_weak (__res_thread_freeres);
  39   call_function_static_weak (__glibc_tls_internal_free);
  40   call_function_static_weak (__libc_dlerror_result_free);
  41
  42   /* This should come last because it shuts down malloc for this
  43      thread and the other shutdown functions might well call free.  */
  44   call_function_static_weak (__malloc_arena_thread_freeres);
  45 }