schedule.h

   1 /** @file schedule.h
   2  *      @brief Thread scheduler.
   3  */
   4
   5 #ifndef __SCHEDULE_H__
   6 #define __SCHEDULE_H__
   7
   8 #include "mymemory.h"
   9 #include "modeltypes.h"
  10 #include "classlist.h"
  11
  12 typedef enum enabled_type {
  13         THREAD_DISABLED,
  14         THREAD_ENABLED,
  15         THREAD_SLEEP_SET
  16 } enabled_type_t;
  17
  18 void enabled_type_to_string(enabled_type_t e, char *str);
  19
  20 /** @brief The Scheduler class performs the mechanics of Thread execution
  21  * scheduling. */
  22 class Scheduler {
  23 public:
  24         Scheduler();
  25         void register_engine(ModelExecution *execution);
  26
  27         void add_thread(Thread *t);
  28         void remove_thread(Thread *t);
  29         void sleep(Thread *t);
  30         void wake(Thread *t);
  31         Thread * select_next_thread();
  32         void set_current_thread(Thread *t);
  33         Thread * get_current_thread() const;
  34         void print() const;
  35         enabled_type_t * get_enabled_array() const { return enabled; };
  36         void remove_sleep(Thread *t);
  37         void add_sleep(Thread *t);
  38         enabled_type_t get_enabled(const Thread *t) const;
  39         bool is_enabled(const Thread *t) const;
  40         bool is_enabled(thread_id_t tid) const;
  41         bool is_sleep_set(const Thread *t) const;
  42         bool all_threads_sleeping() const;
  43         void set_scheduler_thread(thread_id_t tid);
  44
  45         SNAPSHOTALLOC
  46 private:
  47         ModelExecution *execution;
  48         /** The list of available Threads that are not currently running */
  49         enabled_type_t *enabled;
  50         int enabled_len;
  51         int curr_thread_index;
  52         void set_enabled(Thread *t, enabled_type_t enabled_status);
  53
  54         /** The currently-running Thread */
  55         Thread *current;
  56 };
  57
  58 #endif  /* __SCHEDULE_H__ */