text: #ifndef __COROUTINE_SPECIFIC_H__
  #define __COROUTINE_SPECIFIC_H__
  
  extern pthread_key_t gCoroutineHostbufKey;
  
  extern void *coroutine_getspecific(pthread_key_t key);
  extern int coroutine_setspecific(pthread_key_t key, const void *value);
  
  void coroutine_pthread_key_init();
  
  #endif  // __COROUTINE_SPECIFIC_H__
  