elf/tst-single_threaded.c

   1 /* Test support for single-thread optimizations.  No threads.
   2    Copyright (C) 2020-2024 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 <stddef.h>
  20 #include <stdio.h>
  21 #include <support/check.h>
  22 #include <support/namespace.h>
  23 #include <support/xdlfcn.h>
  24 #include <sys/single_threaded.h>
  25
  26 /* Defined in tst-single-threaded-mod1.so.  */
  27 extern _Bool single_threaded_1 (void);
  28
  29 /* Initialized via dlsym.  */
  30 _Bool (*single_threaded_2) (void);
  31 _Bool (*single_threaded_3) (void);
  32
  33 static void
  34 subprocess (void *closure)
  35 {
  36   TEST_VERIFY (__libc_single_threaded);
  37   TEST_VERIFY (single_threaded_1 ());
  38   if (single_threaded_2 != NULL)
  39     TEST_VERIFY (single_threaded_2 ());
  40   if (single_threaded_3 != NULL)
  41     TEST_VERIFY (!single_threaded_3 ());
  42 }
  43
  44 static int
  45 do_test (void)
  46 {
  47   TEST_VERIFY (__libc_single_threaded);
  48   TEST_VERIFY (single_threaded_1 ());
  49   support_isolate_in_subprocess (subprocess, NULL);
  50
  51   void *handle_mod2 = xdlopen ("tst-single_threaded-mod2.so", RTLD_LAZY);
  52   single_threaded_2 = xdlsym (handle_mod2, "single_threaded_2");
  53   TEST_VERIFY (single_threaded_2 ());
  54   support_isolate_in_subprocess (subprocess, NULL);
  55
  56   /* The current implementation treats the inner namespace as
  57      multi-threaded.  */
  58   void *handle_mod3 = dlmopen (LM_ID_NEWLM, "tst-single_threaded-mod3.so",
  59                                RTLD_LAZY);
  60   single_threaded_3 = xdlsym (handle_mod3, "single_threaded_3");
  61   TEST_VERIFY (!single_threaded_3 ());
  62   support_isolate_in_subprocess (subprocess, NULL);
  63
  64   xdlclose (handle_mod3);
  65   xdlclose (handle_mod2);
  66
  67   return 0;
  68 }
  69
  70 #include <support/test-driver.c>