libs/thread/test/sync/mutual_exclusion/locks/upgrade_lock/obs/owns_lock_pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 // Copyright (C) 2011 Vicente J. Botet Escriba
  11 //
  12 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
  13 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  14
  15 // <boost/thread/locks.hpp>
  16
  17 // template <class Mutex> class upgrade_lock;
  18
  19 // bool owns_lock() const;
  20
  21 #include <boost/thread/lock_types.hpp>
  22 #include <boost/thread/shared_mutex.hpp>
  23 #include <boost/detail/lightweight_test.hpp>
  24
  25 boost::shared_mutex m;
  26
  27 int main()
  28 {
  29   boost::upgrade_lock<boost::shared_mutex> lk0;
  30   BOOST_TEST(lk0.owns_lock() == false);
  31   boost::upgrade_lock<boost::shared_mutex> lk1(m);
  32   BOOST_TEST(lk1.owns_lock() == true);
  33   lk1.unlock();
  34   BOOST_TEST(lk1.owns_lock() == false);
  35
  36
  37   return boost::report_errors();
  38 }
  39