message: Replace Sleep(0) with yield() call on Windows
diff: @@ -152,8 +152,18 @@ public:
  if (job)
  return job;
  }
  - if (strategies[k].sleep_duration.count() > 0)
  + if (strategies[k].sleep_duration.count() > 0) {
  +#ifdef CAF_MSVC
  + // Windows cannot sleep less than 1000 us, so timeout is conveted to 0
  + // inside sleep_for(), but Sleep(0) is dangerous so replace it with yield()
  + if (strategies[k].sleep_duration.count() < 1000)
  + std::this_thread::yield();
  + else
  std::this_thread::sleep_for(strategies[k].sleep_duration);
  +#else
  + std::this_thread::sleep_for(strategies[k].sleep_duration);
  +#endif
  + }
  }
  }
  // we assume pretty much nothing is going on so we can relax polling
  