schedule.h

   1 /** @file schedule.h
   2  *      @brief Thread scheduler.
   3  */
   4
   5 #ifndef __SCHEDULE_H__
   6 #define __SCHEDULE_H__
   7
   8 #include <list>
   9 #include "mymemory.h"
  10
  11 /* Forward declaration */
  12 class Thread;
  13 class Node;
  14
  15 typedef enum enabled_type {
  16         THREAD_DISABLED,
  17         THREAD_ENABLED,
  18         THREAD_SLEEP_SET
  19 } enabled_type_t;
  20
  21 /** @brief The Scheduler class performs the mechanics of Thread execution
  22  * scheduling. */
  23 class Scheduler {
  24 public:
  25         Scheduler();
  26         void add_thread(Thread *t);
  27         void remove_thread(Thread *t);
  28         void sleep(Thread *t);
  29         void wake(Thread *t);
  30         Thread * next_thread(Thread *t);
  31         Thread * get_current_thread() const;
  32         void print() const;
  33         enabled_type_t * get_enabled() { return enabled; };
  34         void remove_sleep(Thread *t);
  35         void add_sleep(Thread *t);
  36         enabled_type_t get_enabled(Thread *t);
  37         void update_sleep_set(Node *n);
  38         bool is_enabled(Thread *t) const;
  39         bool is_enabled(thread_id_t tid) const;
  40
  41         SNAPSHOTALLOC
  42 private:
  43         /** The list of available Threads that are not currently running */
  44         enabled_type_t *enabled;
  45         int enabled_len;
  46         int curr_thread_index;
  47         void set_enabled(Thread *t, enabled_type_t enabled_status);
  48
  49         /** The currently-running Thread */
  50         Thread *current;
  51 };
  52
  53 #endif /* __SCHEDULE_H__ */