sync-waiting-test.cpp

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/*
  SyncWaiting(Test)  -  check the monitor object based wait/notification
 
   Copyright (C)
     2008,            Hermann Vosseler <Ichthyostega@web.de>
 
 **Lumiera** is free software; you can redistribute it and/or modify it
 under the terms of the GNU General Public License as published by the
 Free Software Foundation; either version 2 of the License, or (at your
 option) any later version. See the file COPYING for further details.
 
* *****************************************************************/
 
#include "lib/test/run.hpp"
#include "lib/error.hpp"
 
#include "lib/thread.hpp"
#include "lib/sync.hpp"
 
#include <atomic>
 
using test::Test;
using std::atomic_uint;
using std::atomic_bool;
using std::this_thread::sleep_for;
using std::chrono_literals::operator ""ms;
 
 
namespace lib {
namespace test{
  
  namespace { // test subject...
    
    class SyncOnBool
      : public Sync<NonrecursiveLock_Waitable>
      {
        atomic_uint sum_{0}, input_{0};
        atomic_bool got_new_data_{false};
        
      public:
        void getIt()
          {
            Lock await{this, [&]{ return bool(got_new_data_); }};
            sum_ += input_;
          }
        
        void provide (uint val)
          {
            Lock sync{this};
            input_ = val;
            got_new_data_ = true;
            sync.notify_all();
          }
        
        uint result () { return sum_; }
      };
  }//(End) test subject.
  
  
  
  
  
  
  
  /************************************************************************/
  class SyncWaiting_test : public Test
    {
      
      virtual void
      run (Arg)
        {
          seedRand();
          SyncOnBool token;
          
          ThreadJoinable ping ("SyncWaiting ping", [&]{ token.getIt(); });
          ThreadJoinable pong ("SyncWaiting pong", [&]{ token.getIt(); });
          
          CHECK (ping);
          CHECK (pong);
          CHECK (0 == token.result());
          
          sleep_for (100ms);  // if the threads don't block correctly, they've missed their chance by now...
          
          // kick off the notification cascade...
          uint val = rani(1000);
          token.provide (val);
          
          // wait for the two Threads to finish their handshake
          pong.join();
          ping.join();
          
          CHECK (2*val == token.result());
        }
    };
  
  
  
  LAUNCHER (SyncWaiting_test, "unit common");
  
  
  
}} // namespace lib::test