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

   1 // { dg-do run }
   2 // { dg-options "-pthread"  }
   3 // { dg-require-effective-target c++11 }
   4 // { dg-require-effective-target pthread }
   5 // { dg-require-gthreads "" }
   6
   7 // Copyright (C) 2008-2020 Free Software Foundation, Inc.
   8 //
   9 // This file is part of the GNU ISO C++ Library.  This library is free
  10 // software; you can redistribute it and/or modify it under the
  11 // terms of the GNU General Public License as published by the
  12 // Free Software Foundation; either version 3, or (at your option)
  13 // any later version.
  14
  15 // This library is distributed in the hope that it will be useful,
  16 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 // GNU General Public License for more details.
  19
  20 // You should have received a copy of the GNU General Public License along
  21 // with this library; see the file COPYING3.  If not see
  22 // <http://www.gnu.org/licenses/>.
  23
  24
  25 #include <mutex>
  26 #include <system_error>
  27 #include <testsuite_hooks.h>
  28
  29 typedef std::unique_lock<std::mutex> lock_type;
  30
  31 void test01()
  32 {
  33   try
  34     {
  35       std::mutex m1, m2, m3;
  36       lock_type l1(m1);
  37       int result = std::try_lock(m1, m2, m3);
  38       VERIFY( result == 0 );
  39       VERIFY( l1.owns_lock() );
  40       lock_type l2(m2);
  41       lock_type l3(m3);
  42     }
  43   catch (const std::system_error& e)
  44     {
  45       VERIFY( false );
  46     }
  47   catch (...)
  48     {
  49       VERIFY( false );
  50     }
  51 }
  52
  53 void test02()
  54 {
  55   try
  56     {
  57       std::mutex m1, m2, m3;
  58       lock_type l2(m2);
  59       int result = std::try_lock(m1, m2, m3);
  60       VERIFY( result == 1 );
  61       VERIFY( l2.owns_lock() );
  62       lock_type l1(m1);
  63       lock_type l3(m3);
  64     }
  65   catch (const std::system_error& e)
  66     {
  67       VERIFY( false );
  68     }
  69   catch (...)
  70     {
  71       VERIFY( false );
  72     }
  73 }
  74
  75 void test03()
  76 {
  77   try
  78     {
  79       std::mutex m1, m2, m3;
  80       lock_type l3(m3);
  81       int result = std::try_lock(m1, m2, m3);
  82       VERIFY( result == 2 );
  83       VERIFY( l3.owns_lock() );
  84       lock_type l1(m1);
  85       lock_type l2(m2);
  86     }
  87   catch (const std::system_error& e)
  88     {
  89       VERIFY( false );
  90     }
  91   catch (...)
  92     {
  93       VERIFY( false );
  94     }
  95 }
  96
  97 int main()
  98 {
  99   test01();
 100   test02();
 101   test03();
 102   return 0;
 103 }