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//fsf_shared_objects.h

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//

// FSF(FIRST Scheduling Framework) 

// shared objects functionality

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

#include <pthread.h>

#include "fsf_basic_types.h"

#include "fsf_core.h"

#ifndef _FSF_SHARED_OBJECTS_H_

#define _FSF_SHARED_OBJECTS_H_

#define FSF_SHARED_OBJECTS_MODULE_SUPPORTED       1

// These constants are defined in the fsf_configuration_parameters.h

// file:

//#define FSF_MAX_N_SHARED_OBJECTS    100

//#define FSF_MAX_N_CRITICAL_SECTIONS 20

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

//

//// Shared object identifier (null character terminated string)

//typedef char  * fsf_shared_obj_id_t;     

//

//// Shared object handle (opaque type)

//typedef FSF_SHARED_OBJ_HANDLE_T_OPAQUE  fsf_shared_obj_handle_t; 

//

//// Critical section data

//typedef struct {

//   fsf_shared_obj_handle_t obj_handle;

//   struct timespec         wcet;  //Execution time

//} fsf_critical_section_data_t;

//

//// List of critical sections

//typedef struct {

//  int size; // = 0

//  fsf_critical_section_data_t  

//      section[FSF_MAX_N_CRITICAL_SECTIONS];

//} fsf_critical_sections_t;

//

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

//           SHARED OBJECTS & OPERATIONS MANAGEMENT

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

/**

   \ingroup shobjmodule

   Initialization of shared objects. If the object identified by

   obj_id does not yet exist it is created, a handle to the object is

   returned in the variable pointed to by obj_handle, and the

   specified mutex is initialized with the appropriate attributes

   necessary for the current implementation.  If the object already

   exists, the function fails.

   @param [in] obj_id shared object id

   @param [out] obj_handle pointer to a shared object handle

   @param [out] mutex pointer to a mutex variable

   @retval 0 if the operation is succesful

   @retval FSF_ERR_BAD_ARGUMENT if obj_id, obj_handle, or mutex are NULL

   @retval FSF_ERR_SHARED_OBJ_ALREADY_INITIALIZED if the object identified

       by obj_id already exists

   @retval others It may also return any of the error codes that are

       returned by the pthread_mutex_init() POSIX function call

*/

int fsf_init_shared_object

   (fsf_shared_obj_id_t      obj_id,

    fsf_shared_obj_handle_t *obj_handle,

    pthread_mutex_t         *mutex);

/**

   \ingroup shobjmodule

   Getting the handle of shared

   objects. If the object already exists a handle to the object is

   returned in the variable pointed to by obj_handle. Otherwise, an

   error code is returned by the function.

   @param [in] obj_id shared object id

   @param [out] obj_handle pointer to a shared object handle

   @retval 0 if the operation is succesful

   @retval FSF_ERR_BAD_ARGUMENT if obj_id or obj_handle are NULL

   @retval FSF_ERR_SHARED_OBJ_NOT_INITIALIZED if the shared object identified

       by obj_id does not exist

   @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_get_shared_object_handle

   (fsf_shared_obj_id_t      obj_id,

    fsf_shared_obj_handle_t *obj_handle);

/**

   \ingroup shobjmodule

   Getting the mutex of shared objects. If the object exists, a

   pointer to its associated mutex is returned in the variable pointed

   to by mutex. Otherwise, an error code is returned by the function.

   @param [in] obj_handle  shared object handle

   @param [out] mutex pointer to a pointer to a mutex variable,

        (remember that the function give back a pointer to a mutex!)

   @retval 0 if the operation is succesful

   @retval FSF_ERR_BAD_ARGUMENT if obj_handle or mutex are NULL

   @retval FSF_ERR_SHARED_OBJ_NOT_INITIALIZED if the shared object identified

       by obj_id does not exist

   @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_get_shared_object_mutex

   (fsf_shared_obj_handle_t  obj_handle,

    pthread_mutex_t          **mutex);

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

//                       CONTRACT PARAMETERS

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

/**

   \ingroup shobjmodule

   The operation updates the specified contract parameters object by

   setting its critical sections to the specified input parameter.

   @param[in] contract the service contract

   @param[in] critical_sections list of critical sections accessed by tasks

       belonging to the contract

   @retval 0 if the operation is succesful

   @retval FSF_ERR_BAD_ARGUMENT :if any of the pointers is NULL or

       the size of the critical_sections structure is less than zero

       or grater than FSF_MAX_N_CRITICAL_SECTIONS

*/

int

fsf_set_contract_synchronization_parameters

  (fsf_contract_parameters_t     *contract,

   const fsf_critical_sections_t *critical_sections);

/**

   \ingroup shobjmodule

   The operation obtains from the specified contract parameters object

   its critical sections, and copies them to the places pointed to by

   the specified input parameter.  Only those critical_section_data

   records that are in use in the critical_sections structure are

   copied (according to its size field).

   @param[in] contract pointer to a contract

   @param[out] critical_sections list of critical sections to be filled

   @retval 0 if the operation is succesful

   @retval FSF_ERR_BAD_ARGUMENT if any of the pointers is NULL

*/

int

fsf_get_contract_synchronization_parameters

  (const fsf_contract_parameters_t *contract,

   fsf_critical_sections_t         *critical_sections);

#endif // _FSF_SHARED_OBJECTS_H_