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 void f()
  37 {
  38 #if defined BOOST_THREAD_USES_CHRONO
  39   time_point t0 = Clock::now();
  40   BOOST_TEST(!m.try_lock());
  41   BOOST_TEST(!m.try_lock());
  42   BOOST_TEST(!m.try_lock());
  43   while (!m.try_lock())
  44     ;
  45   time_point t1 = Clock::now();
  46   m.unlock();
  47   ns d = t1 - t0 - ms(250);
  48   // This test is spurious as it depends on the time the thread system switches the threads
  49   BOOST_TEST(d < ns(50000000)+ms(1000)); // within 50ms
  50 #else
  51   //time_point t0 = Clock::now();
  52   //BOOST_TEST(!m.try_lock());
  53   //BOOST_TEST(!m.try_lock());
  54   //BOOST_TEST(!m.try_lock());
  55   while (!m.try_lock())
  56     ;
  57   //time_point t1 = Clock::now();
  58   m.unlock();
  59   //ns d = t1 - t0 - ms(250);
  60   // This test is spurious as it depends on the time the thread system switches the threads
  61   //BOOST_TEST(d < ns(50000000)+ms(1000)); // within 50ms
  62 #endif
  63 }
  64
  65 int main()
  66 {
  67   m.lock();
  68   boost::thread t(f);
  69 #if defined BOOST_THREAD_USES_CHRONO
  70   boost::this_thread::sleep_for(ms(250));
  71 #else
  72 #endif
  73   m.unlock();
  74   t.join();
  75
  76   return boost::report_errors();
  77 }
  78