libstdc++-v3/testsuite/30_threads/try_lock/2.cc

   1 // { dg-do run }
   2 // { dg-additional-options "-pthread" { target pthread } }
   3 // { dg-require-effective-target c++11 }
   4 // { dg-require-gthreads "" }
   5
   6 // Copyright (C) 2008-2021 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23
  24 #include <mutex>
  25 #include <system_error>
  26 #include <testsuite_hooks.h>
  27
  28 typedef std::unique_lock<std::mutex> lock_type;
  29
  30 void test01()
  31 {
  32   try
  33     {
  34       std::mutex m1, m2, m3;
  35       lock_type l1(m1);
  36       int result = std::try_lock(m1, m2, m3);
  37       VERIFY( result == 0 );
  38       VERIFY( l1.owns_lock() );
  39       lock_type l2(m2);
  40       lock_type l3(m3);
  41     }
  42   catch (const std::system_error& e)
  43     {
  44       VERIFY( false );
  45     }
  46   catch (...)
  47     {
  48       VERIFY( false );
  49     }
  50 }
  51
  52 void test02()
  53 {
  54   try
  55     {
  56       std::mutex m1, m2, m3;
  57       lock_type l2(m2);
  58       int result = std::try_lock(m1, m2, m3);
  59       VERIFY( result == 1 );
  60       VERIFY( l2.owns_lock() );
  61       lock_type l1(m1);
  62       lock_type l3(m3);
  63     }
  64   catch (const std::system_error& e)
  65     {
  66       VERIFY( false );
  67     }
  68   catch (...)
  69     {
  70       VERIFY( false );
  71     }
  72 }
  73
  74 void test03()
  75 {
  76   try
  77     {
  78       std::mutex m1, m2, m3;
  79       lock_type l3(m3);
  80       int result = std::try_lock(m1, m2, m3);
  81       VERIFY( result == 2 );
  82       VERIFY( l3.owns_lock() );
  83       lock_type l1(m1);
  84       lock_type l2(m2);
  85     }
  86   catch (const std::system_error& e)
  87     {
  88       VERIFY( false );
  89     }
  90   catch (...)
  91     {
  92       VERIFY( false );
  93     }
  94 }
  95
  96 int main()
  97 {
  98   test01();
  99   test02();
 100   test03();
 101   return 0;
 102 }