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//=====================================================================

//       FFFFFFIII   RRRRR      SSTTTTTTT

//      FF         IIR   RR    SS

//     FF           IR        SS

//    FFFFFF         RRRR    SSSSST      

//   FF       FI       RRR  SS

//  FF         II     RRR  SS

// FF           IIIIIR    RS 

//       

// Basic FSF(FIRST Scheduling Framework) contract management

// S.Ha.R.K. Implementation

//=====================================================================

#include "fsf_contract.h"

#include "fsf_server.h"

#include <pthread.h>

#include <stdlib.h>

//#define FSF_DEBUG

int fsf_server_level;

int FSF_register_module(int server_level)

{

  printk("FSF Module\n");

  fsf_server_level = server_level;

  return 0;

}

/* Convert the contract specification to

 * budget parameters

 */

int set_SERVER_budget_from_contract

  (const fsf_contract_parameters_t *contract,

   int *budget)

{

  int local_scheduler_level = 0;

   switch (contract->local_scheduler_id) {

     case FSF_SCHEDULER_POSIX:

       local_scheduler_level = POSIXSTAR_register_level(fsf_server_level,5000,32);

       break;

     case FSF_SCHEDULER_EDF:

       local_scheduler_level = EDFSTAR_register_level(fsf_server_level);

       break;

     case FSF_SCHEDULER_RM:

       local_scheduler_level = RMSTAR_register_level(fsf_server_level);

       break;

   }    

  *budget = SERVER_setbudget(fsf_server_level,

                              TIMESPEC2USEC(&(contract->budget_min)),

                              TIMESPEC2USEC(&(contract->period_max)),

                              local_scheduler_level,contract->local_scheduler_id);

  return 0;

}

int adjust_SERVER_budget_from_contract

  (const fsf_contract_parameters_t *contract,

   int budget)

{

  SERVER_adjust_budget(fsf_server_level,

                       TIMESPEC2USEC(&(contract->budget_min)),

                       TIMESPEC2USEC(&(contract->period_max)),

                       budget);

  return 0;

}

/* Admission Test function */

int add_contract(const fsf_contract_parameters_t *contract)

{

  return 0;

}

int link_contract_to_server(const fsf_contract_parameters_t *contract,

                            fsf_server_id_t server)

{

  return 0;

}

int remove_contract(fsf_server_id_t server)

{

  return 0;

}

int fsf_negotiate_contract

  (const fsf_contract_parameters_t *contract,

   fsf_server_id_t                 *server)

{

  /* Check if contract is initialized */

  if (!contract) return FSF_ERR_NOT_INITIALIZED;

  /* Admission Test */

  if (FSF_ADMISSION_TEST_IS_ENABLED)

    if (add_contract(contract))

      return FSF_ERR_CONTRACT_REJECTED;

  /* SERVER => BUDGET */    

  set_SERVER_budget_from_contract(contract,server);

  #ifdef FSF_DEBUG

    kern_printf("(New Server %d)",*server);

  #endif

  if (*server >= 0)

    link_contract_to_server(contract,*server);

  else

    return FSF_ERR_CREATE_SERVER;

  return 0;

}

int fsf_create_thread

  (fsf_server_id_t    server,

   pthread_t         *thread,

   pthread_attr_t    *attr,

   fsf_thread_code_t  thread_code,

   void              *arg,

   void              *local_scheduler_arg)

{

  NRT_TASK_MODEL nrt;

  int local_scheduler_level,scheduler_id;

  /* Move thread from the posix module to local scheduler */

  #ifdef FSF_DEBUG 

    kern_printf("(FSF:Insert thread = %d to Server = %d)",thread,server);

  #endif

  /* Check if server and thread exsist */

  if (server == NIL)

    return FSF_ERR_INVALID_SERVER;

  local_scheduler_level = SERVER_get_local_scheduler_level_from_budget(fsf_server_level,server);

  scheduler_id = SERVER_get_local_scheduler_id_from_budget(fsf_server_level,server);

  /* Check if thread is already bind */

  switch (scheduler_id) {

    case FSF_SCHEDULER_POSIX:

      nrt_task_default_model(nrt);

      nrt_task_def_save_arrivals(nrt);

      nrt_task_def_arg(nrt,arg);

      nrt_task_def_ctrl_jet(nrt);

      nrt_task_def_level(nrt,local_scheduler_level);

      *thread = task_create("POSIXSTAR", thread_code, &nrt, NULL);

      if (*thread == NIL)

        return FSF_ERR_CREATE_THREAD;

      POSIXSTAR_setbudget(local_scheduler_level, *thread, (int)(server));

      task_activate(*thread);

    break;

    case FSF_SCHEDULER_EDF:

      break;

    case FSF_SCHEDULER_RM:

    default:

      return FSF_ERR_INVALID_SERVER;

      break;

  }

  return 0;

}

int fsf_get_server

  (fsf_server_id_t *server,

   pthread_t       thread)

{

  int local_scheduler_level, scheduler_id;

  local_scheduler_level = SERVER_get_local_scheduler_level_from_pid(fsf_server_level,thread);

  scheduler_id = SERVER_get_local_scheduler_id_from_pid(fsf_server_level, thread);

  switch (scheduler_id) {

    case FSF_SCHEDULER_POSIX:  

      return POSIXSTAR_getbudget(local_scheduler_level,thread);

    case FSF_SCHEDULER_EDF:

      return EDFSTAR_getbudget(local_scheduler_level,thread);

    case FSF_SCHEDULER_RM:

      return RMSTAR_getbudget(local_scheduler_level,thread);

    default:

      return -1;

  }

  return -1;

}

int fsf_cancel_contract

  (fsf_server_id_t *server)

{

  int local_scheduler_level, scheduler_id;

  #ifdef FSF_DEBUG

    kern_printf("(Remove server %d)",*server);

  #endif

  /* Check server id */

  if (*server < 0)

    return FSF_ERR_INVALID_SERVER;

  local_scheduler_level = SERVER_get_local_scheduler_level_from_budget(fsf_server_level,*server);

  scheduler_id = SERVER_get_local_scheduler_id_from_budget(fsf_server_level,*server);

  switch (scheduler_id) {

    case FSF_SCHEDULER_POSIX:

      /* Check if some thread use the server */

      if(POSIXSTAR_budget_has_thread(local_scheduler_level,*server))

        return FSF_ERR_SERVER_USED;

      break;

    case FSF_SCHEDULER_EDF:

      /* Check if some thread use the server */

      if(EDFSTAR_budget_has_thread(local_scheduler_level,*server))

        return FSF_ERR_SERVER_USED;

      break;

    case FSF_SCHEDULER_RM:

      /* Check if some thread use the server */

      if(RMSTAR_budget_has_thread(local_scheduler_level,*server))

        return FSF_ERR_SERVER_USED;

      break;

  }

  SERVER_removebudget(fsf_server_level,*server);

  level_free_descriptor(local_scheduler_level);

  remove_contract(*server);

  *server = -1;

  return 0;

}

int fsf_renegotiate_contract

  (const fsf_contract_parameters_t *new_contract,

   fsf_server_id_t server)

{

  #ifdef FSF_DEBUG

    kern_printf("(Renegotiate for server %d)",server);

  #endif

  if (!new_contract)

    return FSF_ERR_NOT_INITIALIZED;

  if (server < 0)

    return FSF_ERR_INVALID_SERVER;

  return adjust_SERVER_budget_from_contract(new_contract,server);

}