ceph/src/boost/libs/thread/test/sync/conditions/condition_variable/wait_until_pred_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 class Pred
  43 {
  44   int& i_;
  45 public:
  46   explicit Pred(int& i) :
  47     i_(i)
  48   {
  49   }
  50
  51   bool operator()()
  52   {
  53     return i_ != 0;
  54   }
  55 };
  56
  57 boost::condition_variable cv;
  58 boost::mutex mut;
  59
  60 int test1 = 0;
  61 int test2 = 0;
  62
  63 int runs = 0;
  64
  65 void f()
  66 {
  67   boost::unique_lock<boost::mutex> lk(mut);
  68   BOOST_TEST(test2 == 0);
  69   test1 = 1;
  70   cv.notify_one();
  71   Clock::time_point t0 = Clock::now();
  72   Clock::time_point t = t0 + Clock::duration(250);
  73   bool r = cv.wait_until(lk, t, Pred(test2));
  74   Clock::time_point t1 = Clock::now();
  75   if (runs == 0)
  76   {
  77     BOOST_TEST(t1 - t0 < Clock::duration(250));
  78     BOOST_TEST(test2 != 0);
  79     BOOST_TEST(r);
  80   }
  81   else
  82   {
  83     BOOST_TEST(t1 - t0 - Clock::duration(250) < Clock::duration(250+2));
  84     BOOST_TEST(test2 == 0);
  85     BOOST_TEST(!r);
  86   }
  87   ++runs;
  88 }
  89
  90 int main()
  91 {
  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     test2 = 1;
 100     lk.unlock();
 101     cv.notify_one();
 102     t.join();
 103   }
 104   test1 = 0;
 105   test2 = 0;
 106   {
 107     boost::unique_lock<boost::mutex> lk(mut);
 108     boost::thread t(f);
 109     BOOST_TEST(test1 == 0);
 110     while (test1 == 0)
 111       cv.wait(lk);
 112     BOOST_TEST(test1 != 0);
 113     lk.unlock();
 114     t.join();
 115   }
 116
 117   return boost::report_errors();
 118 }
 119
 120 #else
 121 #error "Test not applicable: BOOST_THREAD_USES_CHRONO not defined for this platform as not supported"
 122 #endif