Re: Object-oriented multithreading

One of the big issues is synchronization, especially
of memory reads and writes. For example, if we have

int shared_value = 0;
Mutex shared_value_mutex;
...

void thread_a() {
   shared_value_mutex.lock();
   shared_value += 10;
   shared_value_mutex.unlock();
  }
void thread_b() {
   shared_value_mutex.lock();
   shared_value += 20;
   shared_value_mutex.unlock();
  }

and we assume that thread_b() starts before thread_a()
finishes, it is conceivable that thread_a() will release
the mutex, and thread_b() will get it, before thread_a's
update of shared_value propagates to the processor running
thread_b.