Thread Per-Request (Cont.)

First, the data structures.

/* struct used to hold data about the active threads. */
struct active_threads {
  pthread_mutex_t mutex; /* protect data in the struct.     */
  pthread_cond_t cond;   /* for notifying of dying threads. */
  int num_threads;       /* number of active threads.       */
  int max_num_threads;   /* max active threads that may be. */
};

/* struct used to pass data to a request processing thread. */
struct handler_thread_data {
  struct active_threads* threads;
  struct request* request;
};

/* struct for the manager thread. */
struct mgr_thread_data {
  struct active_threads* threads;
  struct request_queue* q;
  int* should_exit;
};