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
  14 typedef enum enabled_type {
  15         THREAD_DISABLED,
  16         THREAD_ENABLED,
  17         THREAD_SLEEP_SET
  18 } enabled_type_t;
  19
  20 /** @brief The Scheduler class performs the mechanics of Thread execution
  21  * scheduling. */
  22 class Scheduler {
  23 public:
  24         Scheduler();
  25         void add_thread(Thread *t);
  26         void remove_thread(Thread *t);
  27         void sleep(Thread *t);
  28         void wake(Thread *t);
  29         Thread * next_thread(Thread *t);
  30         Thread * get_current_thread() const;
  31         void print() const;
  32         enabled_type_t * get_enabled() { return enabled; };
  33         bool is_enabled(Thread *t) const;
  34
  35         SNAPSHOTALLOC
  36 private:
  37         /** The list of available Threads that are not currently running */
  38         enabled_type_t *enabled;
  39         int enabled_len;
  40         int curr_thread_index;
  41         void set_enabled(Thread *t, enabled_type_t enabled_status);
  42
  43         /** The currently-running Thread */
  44         Thread *current;
  45 };
  46
  47 #endif /* __SCHEDULE_H__ */