libstdc++-v3/testsuite/18_support/96817.cc

   1 // Copyright (C) 2020-2024 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8 //
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do run }
  19 // { dg-additional-options "-pthread" { target pthread } }
  20 // { dg-require-effective-target hosted }
  21
  22 // Static init cannot detect recursion for gthreads targets without futexes
  23 // (and the futex case can only detect it if __libc_single_threaded==true).
  24 // { dg-skip-if "unsupported" { gthreads && { ! futex } } }
  25
  26 // PR libstdc++/96817
  27
  28 #include <exception>
  29 #include <stdlib.h>
  30
  31 int init()
  32 {
  33 #if __has_include(<sys/single_threaded.h>)
  34   // This deadlocks unless __libc_single_threaded is available in Glibc,
  35   // because __cxa_guard_acquire uses __gthread_active_p and the
  36   // multithreaded init can't detect recursion (see PR 97211).
  37   static int i = init();
  38 #endif
  39   return 0;
  40 }
  41
  42 void clean_terminate() { _Exit(0); }
  43
  44 int
  45 main ()
  46 {
  47   std::set_terminate(clean_terminate);
  48   init();
  49 }