ceph/src/boost/libs/thread/test/sync/mutual_exclusion/locks/shared_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 shared_lock;
  18
  19 // shared_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::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  44     BOOST_TEST(lk.owns_lock() == false);
  45   }
  46   {
  47     boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  48     BOOST_TEST(lk.owns_lock() == false);
  49   }
  50   {
  51     boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  52     BOOST_TEST(lk.owns_lock() == false);
  53   }
  54   for (;;)
  55   {
  56     boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  57     if (lk.owns_lock()) break;
  58   }
  59   time_point t1 = Clock::now();
  60   ns d = t1 - t0 - ms(250);
  61   // This test is spurious as it depends on the time the thread system switches the threads
  62   BOOST_TEST(d < ns(50000000)+ms(1000)); // within 50ms
  63 #else
  64 //  time_point t0 = Clock::now();
  65 //  {
  66 //    boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  67 //    BOOST_TEST(lk.owns_lock() == false);
  68 //  }
  69 //  {
  70 //    boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  71 //    BOOST_TEST(lk.owns_lock() == false);
  72 //  }
  73 //  {
  74 //    boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  75 //    BOOST_TEST(lk.owns_lock() == false);
  76 //  }
  77   for (;;)
  78   {
  79     boost::shared_lock<boost::shared_mutex> lk(m, boost::try_to_lock);
  80     if (lk.owns_lock()) break;
  81   }
  82   //time_point t1 = Clock::now();
  83   //ns d = t1 - t0 - ms(250);
  84   // This test is spurious as it depends on the time the thread system switches the threads
  85   //BOOST_TEST(d < ns(50000000)+ms(1000)); // within 50ms
  86 #endif
  87 }
  88
  89 int main()
  90 {
  91   m.lock();
  92   boost::thread t(f);
  93 #if defined BOOST_THREAD_USES_CHRONO
  94   boost::this_thread::sleep_for(ms(250));
  95 #else
  96 #endif
  97   m.unlock();
  98   t.join();
  99
 100   return boost::report_errors();
 101 }
 102