text: //------------------------------------------------------------------------------
  /*
      This file is part of calld: https://github.com/call/calld
      Copyright (c) 2012, 2013 Call Labs Inc.
  
      Permission to use, copy, modify, and/or distribute this software for any
      purpose  with  or without fee is hereby granted, provided that the above
      copyright notice and this permission notice appear in all copies.
  
      THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
      MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
      ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
      ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
      OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
  //==============================================================================
  
  #include <BeastConfig.h>
  #include <call/core/JobQueue.h>
  #include <test/jtx.h>
  #include <chrono>
  #include <condition_variable>
  #include <mutex>
  
  namespace call {
  namespace test {
  
  class Coroutine_test : public beast::unit_test::suite
  {
  public:
      class gate
      {
      private:
          std::condition_variable cv_;
          std::mutex mutex_;
          bool signaled_ = false;
  
      public:
          // Thread safe, blocks until signaled or period expires.
          // Returns `true` if signaled.
          template <class Rep, class Period>
          bool
          wait_for(std::chrono::duration<Rep, Period> const& rel_time)
          {
              std::unique_lock<std::mutex> lk(mutex_);
              auto b = cv_.wait_for(lk, rel_time, [=]{ return signaled_; });
              signaled_ = false;
              return b;
          }
  
          void
          signal()
          {
              std::lock_guard<std::mutex> lk(mutex_);
              signaled_ = true;
              cv_.notify_all();
          }
      };
  
      void
      correct_order()
      {
          using namespace std::chrono_literals;
          using namespace jtx;
          Env env(*this);
          auto& jq = env.app().getJobQueue();
          jq.setThreadCount(0, false);
          gate g1, g2;
          std::shared_ptr<JobQueue::Coro> c;
          jq.postCoro(jtCLIENT, "Coroutine-Test",
              [&](auto const& cr)
              {
                  c = cr;
                  g1.signal();
                  c->yield();
                  g2.signal();
              });
          BEAST_EXPECT(g1.wait_for(5s));
          c->join();
          c->post();
          BEAST_EXPECT(g2.wait_for(5s));
      }
  
      void
      incorrect_order()
      {
          using namespace std::chrono_literals;
          using namespace jtx;
          Env env(*this);
          auto& jq = env.app().getJobQueue();
          jq.setThreadCount(0, false);
          gate g;
          jq.postCoro(jtCLIENT, "Coroutine-Test",
              [&](auto const& c)
              {
                  c->post();
                  c->yield();
                  g.signal();
              });
          BEAST_EXPECT(g.wait_for(5s));
      }
  
      void
      thread_specific_storage()
      {
          using namespace std::chrono_literals;
          using namespace jtx;
          Env env(*this);
          auto& jq = env.app().getJobQueue();
          jq.setThreadCount(0, true);
          static int const N = 4;
          std::array<std::shared_ptr<JobQueue::Coro>, N> a;
  
          LocalValue<int> lv(-1);
          BEAST_EXPECT(*lv == -1);
  
          gate g;
          jq.addJob(jtCLIENT, "LocalValue-Test",
              [&](auto const& job)
              {
                  this->BEAST_EXPECT(*lv == -1);
                  *lv = -2;
                  this->BEAST_EXPECT(*lv == -2);
                  g.signal();
              });
          BEAST_EXPECT(g.wait_for(5s));
          BEAST_EXPECT(*lv == -1);
  
          for(int i = 0; i < N; ++i)
          {
              jq.postCoro(jtCLIENT, "Coroutine-Test",
                  [&, id = i](auto const& c)
                  {
                      a[id] = c;
                      g.signal();
                      c->yield();
  
                      this->BEAST_EXPECT(*lv == -1);
                      *lv = id;
                      this->BEAST_EXPECT(*lv == id);
                      g.signal();
                      c->yield();
  
                      this->BEAST_EXPECT(*lv == id);
                  });
              BEAST_EXPECT(g.wait_for(5s));
              a[i]->join();
          }
          for(auto const& c : a)
          {
              c->post();
              BEAST_EXPECT(g.wait_for(5s));
              c->join();
          }
          for(auto const& c : a)
          {
              c->post();
              c->join();
          }
  
          jq.addJob(jtCLIENT, "LocalValue-Test",
              [&](auto const& job)
              {
                  this->BEAST_EXPECT(*lv == -2);
                  g.signal();
              });
          BEAST_EXPECT(g.wait_for(5s));
          BEAST_EXPECT(*lv == -1);
      }
  
      void
      run()
      {
          correct_order();
          incorrect_order();
          thread_specific_storage();
      }
  };
  
  BEAST_DEFINE_TESTSUITE(Coroutine,core,call);
  
  } // test
  } // call
  