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 #include <iostream>
  25 #include <cassert>
  26
  27 #if defined BOOST_THREAD_USES_CHRONO
  28
  29 struct Clock
  30 {
  31   typedef boost::chrono::milliseconds duration;
  32   typedef duration::rep rep;
  33   typedef duration::period period;
  34   typedef boost::chrono::time_point<Clock> time_point;
  35   static const bool is_steady = true;
  36
  37   static time_point now()
  38   {
  39     using namespace boost::chrono;
  40     return time_point(duration_cast<duration> (steady_clock::now().time_since_epoch()));
  41   }
  42 };
  43
  44 boost::condition_variable cv;
  45 boost::mutex mut;
  46
  47 int test1 = 0;
  48 int test2 = 0;
  49
  50 int runs = 0;
  51
  52 void f()
  53 {
  54   try {
  55     boost::unique_lock < boost::mutex > lk(mut);
  56     assert(test2 == 0);
  57     test1 = 1;
  58     cv.notify_one();
  59     Clock::time_point t0 = Clock::now();
  60     Clock::time_point t = t0 + Clock::duration(250);
  61     int count=0;
  62     while (test2 == 0 && cv.wait_until(lk, t) == boost::cv_status::no_timeout)
  63       count++;
  64     Clock::time_point t1 = Clock::now();
  65     if (runs == 0)
  66     {
  67       assert(t1 - t0 < Clock::duration(250));
  68       assert(test2 != 0);
  69     }
  70     else
  71     {
  72       // This test is spurious as it depends on the time the thread system switches the threads
  73       assert(t1 - t0 - Clock::duration(250) < Clock::duration(count*250+5+1000));
  74       assert(test2 == 0);
  75     }
  76     ++runs;
  77   } catch(...) {
  78       assert(false);
  79       std::cout << "ERROR exception" << __LINE__ << std::endl;
  80   }
  81 }
  82
  83 int main()
  84 {
  85   try
  86   {
  87     boost::unique_lock < boost::mutex > lk(mut);
  88     boost::thread t(f);
  89     BOOST_TEST(test1 == 0);
  90     while (test1 == 0)
  91       cv.wait(lk);
  92     BOOST_TEST(test1 != 0);
  93     test2 = 1;
  94     lk.unlock();
  95     cv.notify_one();
  96     t.join();
  97   } catch(...) {
  98     BOOST_TEST(false);
  99     std::cout << "ERROR exception" << __LINE__ << std::endl;
 100   }
 101
 102   test1 = 0;
 103   test2 = 0;
 104   try
 105   {
 106     boost::unique_lock < boost::mutex > lk(mut);
 107     boost::thread t(f);
 108     BOOST_TEST(test1 == 0);
 109     while (test1 == 0)
 110       cv.wait(lk);
 111     BOOST_TEST(test1 != 0);
 112     lk.unlock();
 113     t.join();
 114   } catch(...) {
 115     BOOST_TEST(false);
 116     std::cout << "ERROR exception" << __LINE__ << std::endl;
 117   }
 118
 119   return boost::report_errors();
 120 }
 121
 122 #else
 123 #error "Test not applicable: BOOST_THREAD_USES_CHRONO not defined for this platform as not supported"
 124 #endif