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//fsf_hierarchical.h

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

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//

// FSF(FIRST Scheduling Framework) 

// hierarchical scheduling management

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

#include <time.h>

#include "fsf_basic_types.h"

#include "fsf_core.h"

#ifndef _FSF_HIERARCHICAL_H_

#define _FSF_HIERARCHICAL_H_

#define FSF_HIERARCHICAL_MODULE_SUPPORTED       1

//// The definition of this types is in fsf_basic_types.h

//

//// Scheduling policies

//typedef enum {FSF_FP, FSF_EDF, FSF_TABLE_DRIVEN, FSF_NONE} 

//    fsf_sched_policy_t;

//

//// Scheduling policy and parameters

//typedef struct {

//  fsf_sched_policy_t    policy;

//  void *                params;

//} fsf_sched_params_t;

//// The params member is a pointer to one of the 

//// following:

////    FP:  int (priority)

////    EDF: struct timespec (deadline)

////    TABLE_DRIVEN : struct fsf_table_driven_params_t

//

//

////Scheduling parameters for the table-driven policy (t.b.d)

//typedef struct {

//  // list of target windows (t.b.d.) 

//  // deadline (for the API): end of september

//} fsf_table_driven_params_t;

//

//

////Initialization information for a scheduling policy

//typedef void * fsf_sched_init_info_t;

//// It shall be one of the following:

////    FP:  none

////    EDF: none

////    TABLE_DRIVEN : struct timespec (schedule duration)

//

// Constants for assigning default values

#define FSF_DEFAULT_SCHED_POLICY        FSF_NONE

/**

   \ingroup hiermodule  

   This call has the following effects:

    - FP:  none

    - EDF: none

    - TABLE_DRIVEN :

       Records the schedule duration, and starts the

       schedule at the time of the call. After the

       schedule duration has elapsed, the schedule in

       the table is repeated.

     @param [in] server server id

     @param [in] info TBD

     @retval FSF_ERR_BAD_ARGUMENT if the value of the server argument

            is not in range or info is NULL

     @retval FSF_ERR_NOT_SCHEDULED_CALLING_THREAD if the calling thread is not

            scheduled under the FSF

     @retval FSF_ERR_INVALID_SCHEDULER_REPLY the scheduler is wrong or not

             running

     @retval FSF_ERR_NOT_CONTRACTED_SERVER if the server of the calling

             thread has been cancelled or it is not valid

*/

int fsf_init_local_scheduler(

   fsf_server_id_t       server,

   fsf_sched_init_info_t info);

/////////////////////////////////////////////////

//                       CONTRACT PARAMETERS

////////////////////////////////////////////////

/**

   \ingroup hiermodule

   The operation updates the specified contract parameters object by

   setting its scheduling policy to the specified input parameter.

   The default policy is FSF_NONE, which means that only one thread

   may be bound to the server

   @param [in] contract pointer to the contract

   @param [in] sched_policy local scheduling policy for this server.

     Can be FSF_FP, FSF_EDF, FSF_TABLE_DRIVEN, FSF_NONE.

   @retval 0 if the operation is succesful

   @retval FSF_ERR_BAD_ARGUMENT if sched_policy is not one of the supported

       ones, or contract is NULL

*/

int

fsf_set_contract_scheduling_policy

  (fsf_contract_parameters_t *contract,

   fsf_sched_policy_t         sched_policy);

/**

   \ingroup hiermodule

   This operation obtains from the specified contract parameters

   object its scheduling policy, and copies it to the place pointed to

   by the corresponding input parameter.

   @param [in] contract pointer to the contract

   @param [out] sched_policy pointer to a variable that will contain

                the scheduling policy

   @retval 0 if the operation is succesful

   @retval FSF_ERR_BAD_ARGUMENT if sched_policy or contract are NULL

*/

int

fsf_get_contract_scheduling_policy

  (const fsf_contract_parameters_t *contract,

   fsf_sched_policy_t              *sched_policy);

/**

   \ingroup hiermodule

   This operation creates a thread and binds it to the specified

   server, which must have a policy different than FSF_NONE. The new

   thread is created with the arguments thread, attr, thread_code and

   arg as they are defined for the pthread_create() POSIX function

   call, and its local scheduling parameters are set to the value

   stored in the variable pointed to by sched_params, which must be

   compatible with the server's scheduling policy. Then, the function

   binds the created thread to the new server. The attr parameter is

   overwritten as necessary to introduce the adequate scheduling

   policy and priority, according to the preemption level given in the

   contract and the fsf_priority_map() function defined by the user.

   @param [in] server server id

   @param [in] sched_params scheduling parameters for the thread

   @param [out] thread the thread id after creation

   @param [in] attr attributes for the task (see pthread_create())

   @param [in] thread_code pointer to a function that implements the

       thread code

   @param [in] arg arguments for the thread

   @retval 0 if the operation is succesful

   @retval FSF_ERR_BAD_ARGUMENT if the value of the server argument

           is not in range, or sched_params is NULL

   @retval FSF_ERR_SCHED_POLICY_NOT_COMPATIBLE if the scheduling policy

       in sched_params is not compatible to the server's one.

   @retval FSF_ERR_INTERNAL_ERROR erroneous binding or malfunction of the FSF

       main scheduler

   @retval FSF_ERR_NOT_CONTRACTED_SERVER if the referenced server is not valid

   @retval others It may also return any of  the errors that may be

       returned by the pthread_create()POSIX function call

*/

int

fsf_create_local_thread

  (fsf_server_id_t        server,

   fsf_sched_params_t    *sched_params,

   pthread_t             *thread,

   pthread_attr_t        *attr,

   fsf_thread_code_t      thread_code,

   void                  *arg);

/**

   \ingroup hiermodule

   This operation associates a thread with a server, which must have a

   policy different than FSF_NONE. The thread's local scheduling

   parameters are set to the value stored in the variable pointed to

   by sched_params, which must be compatible with the server's

   scheduling policy. After the call the thread starts consuming the

   server's budget and is executed according to the contract

   established for that server and to its scheduling policy. If the

   thread was already bound to another server, it is effectively

   unbound from it and bound to the specified one.

   Implementation dependent issue: In order to allow the usage of

   application defined schedulers, the given thread must not have the

   scheduling policy SCHED_APP and at the same time be attached to an

   application scheduler different than the fsf scheduler.

   @param [in] server server id

   @param [in] thread thread id

   @param [in] sched_params scheduling parameters for the thread

   @retval 0 if the operation is succesful

   @retval FSF_ERR_BAD_ARGUMENT if the server argument does not complain with

       the expected format or valid range, the given thread does not exist,

       or sched_params is NULL

   @retval FSF_ERR_SCHED_POLICY_NOT_COMPATIBLE if the scheduling policy

       in sched_params is not compatible to the server's one.

   @retval FSF_ERR_INTERNAL_ERROR erroneous binding or malfunction of the FSF

       main scheduler

   @retval FSF_ERR_UNKNOWN_APPSCHEDULED_THREAD if the thread is attached to

       an application defined scheduler different than the fsf scheduler

   @retval FSF_ERR_NOT_CONTRACTED_SERVER if the referenced server is not valid

*/

int  

fsf_bind_local_thread_to_server

  (fsf_server_id_t      server,

   pthread_t            thread,

   fsf_sched_params_t  *sched_params);

/**

   \ingroup hiermodule

   This function changes the local scheduling parameters of the thread

   to the value pointed to by sched_params. This value must be

   compatible with the scheduling policy of the server to which the

   thread is bound.

   @param [in] thread thread id

   @param [in] sched_params scheduling parameters

   @retval 0 if the operation is succesful

   @retval FSF_ERR_BAD_ARGUMENT if the given thread does not exist,

       or sched_params is NULL

   @retval FSF_ERR_SCHED_POLICY_NOT_COMPATIBLE if the thread is already bound

       and the scheduling policy in sched_params is not compatible to the

       one of the thread's server.

   @retval FSF_ERR_NOT_SCHEDULED_THREAD if the given thread is not scheduled

       under the FSF

   @retval FSF_ERR_INTERNAL_ERROR erroneous binding or malfunction of the FSF

       main scheduler

   @retval FSF_ERR_UNKNOWN_APPSCHEDULED_THREAD if the thread is attached to

       an application defined scheduler different than the fsf scheduler

   @retval FSF_ERR_NOT_CONTRACTED_SERVER if the thread is bound and its server

       is not valid

*/

int  

fsf_set_local_thread_sched_parameters

  (pthread_t                     thread,

   const fsf_sched_params_t  *sched_params);

/**

   \ingroup hiermodule

   This function stores the local scheduling parameters of the

   specified thread in the variable pointed to by sched_params

   @param [in] thread thread id

   @param [out] sched_params scheduling parameters

   @retval 0 if the operation is succesful

   @retval FSF_ERR_BAD_ARGUMENT if sched_params is NULL or the thread does

           not exist

   @retval FSF_ERR_NOT_SCHEDULED_THREAD if the given thread is not scheduled

       under the FSF

*/

int  

fsf_get_local_thread_sched_parameters

  (pthread_t            thread,

   fsf_sched_params_t  *sched_params);

#endif // _FSF_HIERARCHICAL_H_