libstdc++-v3/testsuite/util/thread/all.h

   1 // -*- C++ -*-
   2 // Utilities for testing threads for the C++ library testsuite.
   3 //
   4 // Copyright (C) 2009-2020 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20 //
  21
  22 #ifndef _GLIBCXX_TESTSUITE_THREAD_H
  23 #define _GLIBCXX_TESTSUITE_THREAD_H
  24
  25 #include <sstream>
  26 #include <stdexcept>
  27 #include <type_traits>
  28 #include <thread>
  29
  30 // C++11 only.
  31 namespace __gnu_test
  32 {
  33   // Assume _Tp::native_handle_type.
  34   // Check C++ to native_handle_type characteristics: size and alignment.
  35   template<typename _Tp>
  36     void
  37     compare_type_to_native_type()
  38     {
  39       typedef _Tp test_type;
  40
  41       // Remove possible pointer type.
  42       typedef typename test_type::native_handle_type native_handle;
  43       // For std::thread native_handle_type is the type of its data member,
  44       // for other types it's a pointer to the type of the data member.
  45       typedef typename std::conditional<
  46         std::is_same<test_type, std::thread>::value,
  47         native_handle,
  48         typename std::remove_pointer<native_handle>::type>::type native_type;
  49
  50       int st = sizeof(test_type);
  51       int snt = sizeof(native_type);
  52       int at = __alignof__(test_type);
  53       int ant = __alignof__(native_type);
  54       if (st != snt || at != ant)
  55         {
  56           std::ostringstream s;
  57           s << std::endl;
  58           s << "size of _Tp: " << st << std::endl;
  59           s << "alignment of _Tp: " << st << std::endl;
  60           s << "size of *(_Tp::native_handle_type): " << snt << std::endl;
  61           s << "alignment of *(_Tp::native_handle_type): " << snt << std::endl;
  62           throw std::runtime_error(s.str());
  63         }
  64     }
  65 } // namespace __gnu_test
  66
  67 #endif // _GLIBCXX_TESTSUITE_THREAD_H
  68