1  /* Test support for single-thread optimizations.  No threads.
       2     Copyright (C) 2020-2023 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>