ceph/src/boost/libs/thread/test/sync/mutual_exclusion/locks/unique_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 unique_lock;
  18
  19 // unique_lock(mutex_type& m, try_to_lock_t);
  20
  21
  22 #include <boost/thread/lock_types.hpp>
  23 #include <boost/thread/mutex.hpp>
  24 #include <boost/thread/thread.hpp>
  25 #include <boost/detail/lightweight_test.hpp>
  26
  27
  28 boost::mutex m;
  29
  30 #if defined BOOST_THREAD_USES_CHRONO
  31 typedef boost::chrono::system_clock Clock;
  32 typedef Clock::time_point time_point;
  33 typedef Clock::duration duration;
  34 typedef boost::chrono::milliseconds ms;
  35 typedef boost::chrono::nanoseconds ns;
  36 #else
  37 #endif
  38
  39 void f()
  40 {
  41 #if defined BOOST_THREAD_USES_CHRONO
  42   time_point t0 = Clock::now();
  43   {
  44     boost::unique_lock<boost::mutex> lk(m, boost::try_to_lock);
  45     BOOST_TEST(lk.owns_lock() == false);
  46   }
  47   {
  48     boost::unique_lock<boost::mutex> lk(m, boost::try_to_lock);
  49     BOOST_TEST(lk.owns_lock() == false);
  50   }
  51   {
  52     boost::unique_lock<boost::mutex> lk(m, boost::try_to_lock);
  53     BOOST_TEST(lk.owns_lock() == false);
  54   }
  55   while (true)
  56   {
  57     boost::unique_lock<boost::mutex> lk(m, boost::try_to_lock);
  58     if (lk.owns_lock()) break;
  59   }
  60   time_point t1 = Clock::now();
  61   //m.unlock();
  62   ns d = t1 - t0 - ms(250);
  63   // This test is spurious as it depends on the time the thread system switches the threads
  64   BOOST_TEST(d < ns(50000000)+ms(1000)); // within 50ms
  65 #else
  66 //  time_point t0 = Clock::now();
  67 //  {
  68 //    boost::unique_lock<boost::mutex> lk(m, boost::try_to_lock);
  69 //    BOOST_TEST(lk.owns_lock() == false);
  70 //  }
  71 //  {
  72 //    boost::unique_lock<boost::mutex> lk(m, boost::try_to_lock);
  73 //    BOOST_TEST(lk.owns_lock() == false);
  74 //  }
  75 //  {
  76 //    boost::unique_lock<boost::mutex> lk(m, boost::try_to_lock);
  77 //    BOOST_TEST(lk.owns_lock() == false);
  78 //  }
  79   while (true)
  80   {
  81     boost::unique_lock<boost::mutex> lk(m, boost::try_to_lock);
  82     if (lk.owns_lock()) break;
  83   }
  84   //time_point t1 = Clock::now();
  85   //ns d = t1 - t0 - ms(250);
  86   // This test is spurious as it depends on the time the thread system switches the threads
  87   //BOOST_TEST(d < ns(50000000)+ms(1000)); // within 50ms
  88 #endif
  89 }
  90
  91 int main()
  92 {
  93   m.lock();
  94   boost::thread t(f);
  95 #if defined BOOST_THREAD_USES_CHRONO
  96   boost::this_thread::sleep_for(ms(250));
  97 #else
  98 #endif
  99   m.unlock();
 100   t.join();
 101
 102   return boost::report_errors();
 103 }
 104