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/*
 *                               POK header
 * 
 * The following file is a part of the POK project. Any modification should
 * made according to the POK licence. You CANNOT use this file or a part of
 * this file is this part of a file for your own project
 *
 * For more information on the POK licence, please see our LICENCE FILE
 *
 * Please follow the coding guidelines described in doc/CODING_GUIDELINES
 *
 *                                      Copyright (c) 2007-2009 POK team 
 *
 * Created by julien on Thu Jan 15 23:34:13 2009 
 */

#ifndef __POK_SCHED_H__
#define __POK_SCHED_H__

#if defined (POK_NEEDS_SCHED) || defined (POK_NEEDS_THREADS)

#include <types.h>
#include <errno.h>
#include <core/schedvalues.h>

#ifdef POK_NEEDS_PARTITIONS
extern uint8_t pok_current_partition;
#define POK_SCHED_CURRENT_PARTITION pok_current_partition
#endif


extern uint32_t  current_thread;
#define POK_SCHED_CURRENT_THREAD current_thread

typedef enum
{
  POK_STATE_STOPPED = 0,
  POK_STATE_RUNNABLE = 1,
  POK_STATE_WAITING = 2,
  POK_STATE_LOCK = 3,
  POK_STATE_WAIT_NEXT_ACTIVATION = 4,
  POK_STATE_DELAYED_START = 5
} pok_state_t;

void pok_sched_init (void); /* Initialize scheduling stuff */

void pok_sched (void);      /* Main scheduling function, this function
                             * schedules everything
                             */

/* Get priority function, return are made according to a scheduler */
uint8_t pok_sched_get_priority_min (const pok_sched_t sched_type);
uint8_t pok_sched_get_priority_max (const pok_sched_t sched_type);

/* Scheduler election method */
uint8_t pok_sched_election (void);
uint32_t pok_sched_part_rr (const uint32_t ,const uint32_t,const uint32_t prev_thread,const uint32_t current_thread);
uint32_t pok_sched_part_rms (const uint32_t ,const uint32_t,const uint32_t prev_thread,const uint32_t current_thread);

/* Context switch functions */
void pok_sched_context_switch (const uint32_t);
void pok_partition_switch (void);

/*
 * Functions to lock threads
 */
void pok_sched_lock_thread (const uint32_t);
void pok_sched_unlock_thread (const uint32_t);
void pok_sched_lock_current_thread (void);
void pok_sched_lock_current_thread_timed (const uint64_t time);
void pok_sched_stop_thread (const uint32_t tid);
void pok_sched_stop_self (void);
pok_ret_t pok_sched_end_period ();

#ifdef POK_NEEDS_PARTITIONS
void pok_sched_activate_error_thread (void);
#endif

uint32_t pok_sched_get_current(uint32_t *thread_id);

#endif /* POK_NEEDS.... */

#endif /* !__POK_SCHED_H__ */