ceph/src/boost/libs/thread/test/sync/conditions/condition_variable/wait_for_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 class Pred
  28 {
  29   int& i_;
  30 public:
  31   explicit Pred(int& i) :
  32     i_(i)
  33   {
  34   }
  35
  36   bool operator()()
  37   {
  38     return i_ != 0;
  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   typedef boost::chrono::system_clock Clock;
  53   typedef boost::chrono::milliseconds milliseconds;
  54   boost::unique_lock < boost::mutex > lk(mut);
  55   BOOST_TEST(test2 == 0);
  56   test1 = 1;
  57   cv.notify_one();
  58   Clock::time_point t0 = Clock::now();
  59   int count=0;
  60   //bool r =
  61       (void)cv.wait_for(lk, milliseconds(250), Pred(test2));
  62   count++;
  63   Clock::time_point t1 = Clock::now();
  64   if (runs == 0)
  65   {
  66     // This test is spurious as it depends on the time the thread system switches the threads
  67     BOOST_TEST(t1 - t0 < milliseconds(250+1000));
  68     BOOST_TEST(test2 != 0);
  69   }
  70   else
  71   {
  72     BOOST_TEST(t1 - t0 - milliseconds(250) < milliseconds(count*250+2));
  73     BOOST_TEST(test2 == 0);
  74   }
  75   ++runs;
  76 }
  77
  78 int main()
  79 {
  80   {
  81     boost::unique_lock < boost::mutex > lk(mut);
  82     boost::thread t(f);
  83     BOOST_TEST(test1 == 0);
  84     while (test1 == 0)
  85       cv.wait(lk);
  86     BOOST_TEST(test1 != 0);
  87     test2 = 1;
  88     lk.unlock();
  89     cv.notify_one();
  90     t.join();
  91   }
  92   test1 = 0;
  93   test2 = 0;
  94   {
  95     boost::unique_lock < boost::mutex > lk(mut);
  96     boost::thread t(f);
  97     BOOST_TEST(test1 == 0);
  98     while (test1 == 0)
  99       cv.wait(lk);
 100     BOOST_TEST(test1 != 0);
 101     lk.unlock();
 102     t.join();
 103   }
 104
 105   return boost::report_errors();
 106 }
 107
 108 #else
 109 #error "Test not applicable: BOOST_THREAD_USES_CHRONO not defined for this platform as not supported"
 110 #endif