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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 "cbsstar.h"

#include "posixstar.h"

#include "edfstar.h"

#include "posix.h"

#include "comm_message.h"

#include <pthread.h>

#include <stdlib.h>

//#define FSF_DEBUG

int fsf_cbsstar_level;

int fsf_posix_level;

int FSF_register_module(int posix_level, int cbsstar_level)

{

  printk("FSF Module\n");

  fsf_posix_level = posix_level;

  fsf_cbsstar_level = cbsstar_level;

  return 0;

}

/* Convert the contract specification to

 * budget parameters

 */

int set_CBSSTAR_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_cbsstar_level,5000,32);

       break;

     case FSF_SCHEDULER_EDF:

       local_scheduler_level = EDFSTAR_register_level(fsf_cbsstar_level);

       break;

     case FSF_SCHEDULER_RM:

       break;

   }    

  *budget = CBSSTAR_setbudget(fsf_cbsstar_level,

                              TIMESPEC2USEC(&(contract->budget_min)),

                              TIMESPEC2USEC(&(contract->period_max)),

                              local_scheduler_level,contract->local_scheduler_id);

  return 0;

}

int adjust_CBSSTAR_budget_from_contract

  (const fsf_contract_parameters_t *contract,

   int budget)

{

  CBSSTAR_adjust_budget(fsf_cbsstar_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_CBSSTAR_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_bind_thread_to_server

  (fsf_server_id_t server,

   pthread_t       thread,

   void            *rt_arg)

{

  STD_command_message *msg;

  int local_scheduler_level,scheduler_id;

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

  #ifdef FSF_DEBUG 

    kern_printf("(Bind thread = %d to Server = %d)",thread,server);

  #endif

  /* Check if server and thread exsist */

  if (server == -1 || thread == -1)

    return FSF_ERR_BIND_THREAD;

  local_scheduler_level = CBSSTAR_get_local_scheduler_level_from_budget(fsf_cbsstar_level,server);

  scheduler_id = CBSSTAR_get_local_scheduler_id_from_budget(fsf_cbsstar_level,server);

  /* Check if thread is already bind */

  switch (scheduler_id) {

    case FSF_SCHEDULER_POSIX:

      if (POSIXSTAR_getbudget(local_scheduler_level,thread) != -1)

        return FSF_ERR_BIND_THREAD;

      /* Set server on local scheduler */

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

      /* Send change level command to posix level */

      msg = (STD_command_message *)malloc(sizeof(STD_command_message));

      msg->command = STD_SET_NEW_MODEL;

      msg->param = (void *)(rt_arg);

      level_table[local_scheduler_level]->public_message(local_scheduler_level,thread,msg);

      msg->command = STD_SET_NEW_LEVEL;

      msg->param = (void *)(local_scheduler_level);

      task_message(msg,thread,0);

      free(msg);

    break;

    case FSF_SCHEDULER_EDF:

      if (EDFSTAR_getbudget(local_scheduler_level,thread) != -1)

        return FSF_ERR_BIND_THREAD;

      /* Set server on local scheduler */

      EDFSTAR_setbudget(local_scheduler_level,thread,(int)(server));

      /* Send change level command to posix level */

      msg = (STD_command_message *)malloc(sizeof(STD_command_message));

      msg->command = STD_SET_NEW_MODEL;

      msg->param = (void *)(rt_arg);

      level_table[local_scheduler_level]->public_message(local_scheduler_level,thread,msg);

      msg->command = STD_SET_NEW_LEVEL;

      msg->param = (void *)(local_scheduler_level);

      task_message(msg,thread,0);

      free(msg);

      break;

    case FSF_SCHEDULER_RM:

    default:

      return FSF_ERR_BIND_THREAD;

      break;

  }

  return 0;

}

int fsf_unbind_thread_from_server

  (pthread_t       thread)

{

  int local_scheduler_level, scheduler_id;

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

  #ifdef FSF_DEBUG

    kern_printf("(UnBind thread = %d)",thread);

  #endif

  /* Check if thread exsists */

  if (thread == -1)

    return FSF_ERR_UNBIND_THREAD;

  local_scheduler_level = CBSSTAR_get_local_scheduler_level_from_pid(fsf_cbsstar_level,thread);

  scheduler_id = CBSSTAR_get_local_scheduler_id_from_pid(fsf_cbsstar_level,thread);

  switch (scheduler_id) {

    case FSF_SCHEDULER_POSIX:

      /* Check if it is bind to a server */

      if (POSIXSTAR_getbudget(local_scheduler_level,thread) == -1)

        return FSF_ERR_UNBIND_THREAD;

      else {

        STD_command_message *msg;

        NRT_TASK_MODEL nrt;

        nrt_task_default_model(nrt);

        nrt_task_def_save_arrivals(nrt);

        /* Send change level command to local scheduler */

        msg = (STD_command_message *)malloc(sizeof(STD_command_message));

        msg->command = STD_SET_NEW_MODEL;

        msg->param = (void *)(&nrt);

        level_table[fsf_posix_level]->public_message(fsf_posix_level,thread,msg);

        msg->command = STD_SET_NEW_LEVEL;

        msg->param = (void *)(fsf_posix_level);

        task_message(msg,thread,0);

        free(msg);

      }

    break;

    case FSF_SCHEDULER_EDF:

      if (EDFSTAR_getbudget(local_scheduler_level,thread) == -1)

        return FSF_ERR_UNBIND_THREAD;

      else {

        STD_command_message *msg;

        NRT_TASK_MODEL nrt;

        nrt_task_default_model(nrt);

        nrt_task_def_save_arrivals(nrt);

        /* Send change level command to local scheduler */

        msg = (STD_command_message *)malloc(sizeof(STD_command_message));

        msg->command = STD_SET_NEW_MODEL;

        msg->param = (void *)(&nrt);

        level_table[fsf_posix_level]->public_message(fsf_posix_level,thread,msg);

        msg->command = STD_SET_NEW_LEVEL;

        msg->param = (void *)(fsf_posix_level);

        task_message(msg,thread,0);

        free(msg);

      }

      break;

    case FSF_SCHEDULER_RM:

      break;

  }

  return 0;

}

int fsf_negotiate_contract_for_new_thread

  (const fsf_contract_parameters_t *contract,

   fsf_server_id_t      *server,

   pthread_t            *thread,

   pthread_attr_t       *attr,

   fsf_thread_code_t     thread_code,

   void                 *arg,

   void                 *rt_arg)

{

  int error;

  /* Create server */

  error = fsf_negotiate_contract(contract, server);

  if (error) return error;

  /* Create pthread */

  if (pthread_create(thread, attr, thread_code, arg))

    return FSF_ERR_CREATE_THREAD;

  /* Bind thread to server */

  error = fsf_bind_thread_to_server(*server, *thread, rt_arg);

  if (error) return error;

  return 0;

}

int fsf_negotiate_contract_for_myself

  (const fsf_contract_parameters_t *contract,

   fsf_server_id_t *server,

   void            *rt_arg)

{

  int error;

  /* Create server */

  error = fsf_negotiate_contract(contract, server);

  if (error) return error;

  /* Bind current thread to server */

  error = fsf_bind_thread_to_server(*server, exec_shadow, rt_arg);

  if (error) return error;

  return 0;

}

int fsf_get_server

  (fsf_server_id_t *server,

   pthread_t       thread)

{

  int local_scheduler_level, scheduler_id;

  local_scheduler_level = CBSSTAR_get_local_scheduler_level_from_pid(fsf_cbsstar_level,thread);

  scheduler_id = CBSSTAR_get_local_scheduler_id_from_pid(fsf_cbsstar_level, thread);

  switch (scheduler_id) {

    case FSF_SCHEDULER_POSIX:  

      return POSIXSTAR_getbudget(local_scheduler_level,thread);

    case FSF_SCHEDULER_EDF:

    case FSF_SCHEDULER_RM:

      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 = CBSSTAR_get_local_scheduler_level_from_budget(fsf_cbsstar_level,*server);

  scheduler_id = CBSSTAR_get_local_scheduler_id_from_budget(fsf_cbsstar_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:

    case FSF_SCHEDULER_RM:

      break;

  }

  CBSSTAR_removebudget(fsf_cbsstar_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_CBSSTAR_budget_from_contract(new_contract,server);

}