nptl/tst-thread-setspecific.c

   1 /* Test to verify that passing a pointer to an uninitialized object
   2    to pthread_setspecific doesn't trigger bogus uninitialized warnings.
   3    Copyright (C) 2021-2024 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <pthread.h>
  21 #include <stdlib.h>
  22 #include <libc-diag.h>
  23
  24 /* Turn uninitialized warnings into errors to detect the problem.
  25    See BZ #27714.  */
  26
  27 DIAG_PUSH_NEEDS_COMMENT;
  28 DIAG_IGNORE_NEEDS_COMMENT (6, "-Wmaybe-uninitialized");
  29 DIAG_IGNORE_NEEDS_COMMENT (6, "-Wuninitialized");
  30
  31 static int
  32 do_test (void)
  33 {
  34   void *p = malloc (1);   /* Deliberately uninitialized.  */
  35   pthread_setspecific (pthread_self (), p);
  36
  37   void *q = pthread_getspecific (pthread_self ());
  38
  39   return p == q;
  40 }
  41
  42 DIAG_POP_NEEDS_COMMENT;
  43
  44 #include <support/test-driver.c>