ceph/src/boost/libs/thread/test/sync/mutual_exclusion/locks/upgrade_lock/cons/try_to_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 // upgrade_lock(mutex_type& m, try_to_lock_t);
  20
  21
  22 #include <boost/thread/lock_types.hpp>
  23 #include <boost/thread/shared_mutex.hpp>
  24 #include <boost/thread/thread.hpp>
  25 #include <boost/detail/lightweight_test.hpp>
  26
  27 boost::shared_mutex m;
  28
  29 #if defined BOOST_THREAD_USES_CHRONO
  30 typedef boost::chrono::system_clock Clock;
  31 typedef Clock::time_point time_point;
  32 typedef Clock::duration duration;
  33 typedef boost::chrono::milliseconds ms;
  34 typedef boost::chrono::nanoseconds ns;
  35 #else
  36 #endif
  37
  38 void f()
  39 {
  40 #if defined BOOST_THREAD_USES_CHRONO
  41   time_point t0 = Clock::now();
  42   {
  43     boost::upgrade_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  44     BOOST_TEST(lk.owns_lock() == false);
  45   }
  46   {
  47     boost::upgrade_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  48     BOOST_TEST(lk.owns_lock() == false);
  49   }
  50   {
  51     boost::upgrade_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  52     BOOST_TEST(lk.owns_lock() == false);
  53   }
  54   for (;;)
  55   {
  56     boost::upgrade_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  57     if (lk.owns_lock()) break;
  58   }
  59   time_point t1 = Clock::now();
  60   //m.unlock();
  61   ns d = t1 - t0 - ms(250);
  62   // This test is spurious as it depends on the time the thread system switches the threads
  63   BOOST_TEST(d < ns(50000000)+ms(1000)); // within 50ms
  64 #else
  65 //  time_point t0 = Clock::now();
  66 //  {
  67 //    boost::upgrade_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  68 //    BOOST_TEST(lk.owns_lock() == false);
  69 //  }
  70 //  {
  71 //    boost::upgrade_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  72 //    BOOST_TEST(lk.owns_lock() == false);
  73 //  }
  74 //  {
  75 //    boost::upgrade_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  76 //    BOOST_TEST(lk.owns_lock() == false);
  77 //  }
  78   for (;;)
  79   {
  80     boost::upgrade_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  81     if (lk.owns_lock()) break;
  82   }
  83   //time_point t1 = Clock::now();
  84   //ns d = t1 - t0 - ms(250);
  85   // This test is spurious as it depends on the time the thread system switches the threads
  86   //BOOST_TEST(d < ns(50000000)+ms(1000)); // within 50ms
  87 #endif
  88 }
  89
  90 int main()
  91 {
  92   m.lock();
  93   boost::thread t(f);
  94 #if defined BOOST_THREAD_USES_CHRONO
  95   boost::this_thread::sleep_for(ms(250));
  96 #else
  97 #endif
  98   m.unlock();
  99   t.join();
 100
 101   return boost::report_errors();
 102 }
 103