gistfile1.cpp

static coroutine* curr_coroutine;  // getspecific, setspecific use this global var to know what is running

void resume (coroutine* target) {
  coroutine* self = curr_coroutine;
  { Unlocker unlocker;  // archive currently running coroutine
    curr_coroutine = target;
    switch_context(target);
    current_coroutine = self;
  } // here ~Unlocker will restore information from curr_coroutine.
}


// this is a coroutine entry point
void entry (coroutine* self) {
  curr_coroutine = self;
  { Locker lock;  // we are entering new coroutine
    invoke_javascript_code();
  }
}