ceph/src/boost/libs/thread/test/sync/mutual_exclusion/shared_mutex/try_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) 2012 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/shared_mutex.hpp>
  16
  17 // class shared_mutex;
  18
  19 // bool try_lock();
  20
  21 #include <boost/thread/shared_mutex.hpp>
  22 #include <boost/thread/thread.hpp>
  23 #include <boost/detail/lightweight_test.hpp>
  24
  25 boost::shared_mutex m;
  26
  27 #if defined BOOST_THREAD_USES_CHRONO
  28 typedef boost::chrono::system_clock Clock;
  29 typedef Clock::time_point time_point;
  30 typedef Clock::duration duration;
  31 typedef boost::chrono::milliseconds ms;
  32 typedef boost::chrono::nanoseconds ns;
  33 #else
  34 #endif
  35
  36 #ifdef BOOST_THREAD_PLATFORM_WIN32
  37 const ms max_diff(250);
  38 #else
  39 const ms max_diff(75);
  40 #endif
  41
  42 void f()
  43 {
  44 #if defined BOOST_THREAD_USES_CHRONO
  45   time_point t0 = Clock::now();
  46   BOOST_TEST(!m.try_lock());
  47   BOOST_TEST(!m.try_lock());
  48   BOOST_TEST(!m.try_lock());
  49   while (!m.try_lock())
  50     ;
  51   time_point t1 = Clock::now();
  52   m.unlock();
  53   ns d = t1 - t0 - ms(250);
  54   BOOST_TEST(d < max_diff);
  55 #else
  56   //time_point t0 = Clock::now();
  57   //BOOST_TEST(!m.try_lock());
  58   //BOOST_TEST(!m.try_lock());
  59   //BOOST_TEST(!m.try_lock());
  60   while (!m.try_lock())
  61     ;
  62   //time_point t1 = Clock::now();
  63   m.unlock();
  64   //ns d = t1 - t0 - ms(250);
  65   //BOOST_TEST(d < max_diff);
  66 #endif
  67 }
  68
  69 int main()
  70 {
  71   m.lock();
  72   boost::thread t(f);
  73 #if defined BOOST_THREAD_USES_CHRONO
  74   boost::this_thread::sleep_for(ms(250));
  75 #else
  76 #endif
  77   m.unlock();
  78   t.join();
  79
  80   return boost::report_errors();
  81 }
  82