ceph/src/boost/libs/thread/test/sync/conditions/condition_variable/wait_until_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 // Copyright (C) 2011 Vicente J. Botet Escriba
  10 //
  11 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
  12 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  13
  14 // <boost/thread/condition_variable>
  15
  16 // class condition_variable;
  17
  18 // condition_variable(const condition_variable&) = delete;
  19
  20 #include <boost/thread/condition_variable.hpp>
  21 #include <boost/thread/mutex.hpp>
  22 #include <boost/thread/thread.hpp>
  23 #include <boost/detail/lightweight_test.hpp>
  24
  25 #if defined BOOST_THREAD_USES_CHRONO
  26
  27 struct Clock
  28 {
  29   typedef boost::chrono::milliseconds duration;
  30   typedef duration::rep rep;
  31   typedef duration::period period;
  32   typedef boost::chrono::time_point<Clock> time_point;
  33   static const bool is_steady = true;
  34
  35   static time_point now()
  36   {
  37     using namespace boost::chrono;
  38     return time_point(duration_cast<duration> (steady_clock::now().time_since_epoch()));
  39   }
  40 };
  41
  42 boost::condition_variable cv;
  43 boost::mutex mut;
  44
  45 int test1 = 0;
  46 int test2 = 0;
  47
  48 int runs = 0;
  49
  50 void f()
  51 {
  52   boost::unique_lock < boost::mutex > lk(mut);
  53   BOOST_TEST(test2 == 0);
  54   test1 = 1;
  55   cv.notify_one();
  56   Clock::time_point t0 = Clock::now();
  57   Clock::time_point t = t0 + Clock::duration(250);
  58   int count=0;
  59   while (test2 == 0 && cv.wait_until(lk, t) == boost::cv_status::no_timeout)
  60     count++;
  61   Clock::time_point t1 = Clock::now();
  62   if (runs == 0)
  63   {
  64     BOOST_TEST(t1 - t0 < Clock::duration(250));
  65     BOOST_TEST(test2 != 0);
  66   }
  67   else
  68   {
  69     // This test is spurious as it depends on the time the thread system switches the threads
  70     BOOST_TEST(t1 - t0 - Clock::duration(250) < Clock::duration(count*250+5+1000));
  71     BOOST_TEST(test2 == 0);
  72   }
  73   ++runs;
  74 }
  75
  76 int main()
  77 {
  78   {
  79     boost::unique_lock < boost::mutex > lk(mut);
  80     boost::thread t(f);
  81     BOOST_TEST(test1 == 0);
  82     while (test1 == 0)
  83       cv.wait(lk);
  84     BOOST_TEST(test1 != 0);
  85     test2 = 1;
  86     lk.unlock();
  87     cv.notify_one();
  88     t.join();
  89   }
  90   test1 = 0;
  91   test2 = 0;
  92   {
  93     boost::unique_lock < boost::mutex > lk(mut);
  94     boost::thread t(f);
  95     BOOST_TEST(test1 == 0);
  96     while (test1 == 0)
  97       cv.wait(lk);
  98     BOOST_TEST(test1 != 0);
  99     lk.unlock();
 100     t.join();
 101   }
 102
 103   return boost::report_errors();
 104 }
 105
 106 #else
 107 #error "Test not applicable: BOOST_THREAD_USES_CHRONO not defined for this platform as not supported"
 108 #endif