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1063 | tullio | 1 | |
2 | /* |
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3 | * This program is free software; you can redistribute it and/or modify |
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4 | * it under the terms of the GNU General Public License as published by |
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5 | * the Free Software Foundation; either version 2 of the License, or |
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6 | * (at your option) any later version. |
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7 | * |
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8 | * This program is distributed in the hope that it will be useful, |
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9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 | * GNU General Public License for more details. |
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12 | * |
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13 | * You should have received a copy of the GNU General Public License |
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14 | * along with this program; if not, write to the Free Software |
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15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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16 | * |
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17 | */ |
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18 | |||
929 | lipari | 19 | /** |
20 | @file Shared Objects |
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21 | */ |
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22 | |||
881 | trimarchi | 23 | //fsf_shared_objects.h |
24 | //================================================== |
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25 | // FFFFFFIII RRRRR SSTTTTTTT |
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26 | // FF IIR RR SS |
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27 | // FF IR SS |
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28 | // FFFFFF RRRR SSSSST |
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29 | // FF FI RRR SS |
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30 | // FF II RRR SS |
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31 | // FF IIIIIR RS |
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32 | // |
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33 | // FSF(FIRST Scheduling Framework) |
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34 | // shared objects functionality |
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35 | //==================================================== |
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36 | |||
37 | #include <pthread.h> |
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38 | #include "fsf_basic_types.h" |
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39 | #include "fsf_core.h" |
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40 | |||
41 | #ifndef _FSF_SHARED_OBJECTS_H_ |
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42 | #define _FSF_SHARED_OBJECTS_H_ |
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43 | |||
44 | #define FSF_SHARED_OBJECTS_MODULE_SUPPORTED 1 |
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45 | |||
46 | |||
47 | // These constants are defined in the fsf_configuration_parameters.h |
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48 | // file: |
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49 | |||
50 | //#define FSF_MAX_N_SHARED_OBJECTS 100 |
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51 | //#define FSF_MAX_N_CRITICAL_SECTIONS 20 |
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52 | |||
53 | |||
54 | //// The definition of this types is in fsf_basic_types.h |
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55 | // |
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56 | //// Shared object identifier (null character terminated string) |
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57 | //typedef char * fsf_shared_obj_id_t; |
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58 | // |
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59 | //// Shared object handle (opaque type) |
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60 | //typedef FSF_SHARED_OBJ_HANDLE_T_OPAQUE fsf_shared_obj_handle_t; |
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61 | // |
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62 | //// Critical section data |
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63 | //typedef struct { |
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64 | // fsf_shared_obj_handle_t obj_handle; |
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65 | // struct timespec wcet; //Execution time |
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66 | //} fsf_critical_section_data_t; |
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67 | // |
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68 | //// List of critical sections |
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69 | //typedef struct { |
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70 | // int size; // = 0 |
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71 | // fsf_critical_section_data_t |
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72 | // section[FSF_MAX_N_CRITICAL_SECTIONS]; |
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73 | //} fsf_critical_sections_t; |
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74 | // |
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75 | |||
76 | ///////////////////////////////////////////////////// |
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77 | // SHARED OBJECTS & OPERATIONS MANAGEMENT |
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78 | ///////////////////////////////////////////////////// |
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79 | |||
928 | trimarchi | 80 | /** |
81 | \ingroup shobjmodule |
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82 | |||
83 | Initialization of shared objects. If the object identified by |
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84 | obj_id does not yet exist it is created, a handle to the object is |
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85 | returned in the variable pointed to by obj_handle, and the |
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86 | specified mutex is initialized with the appropriate attributes |
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87 | necessary for the current implementation. If the object already |
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88 | exists, the function fails. |
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89 | |||
90 | @param [in] obj_id shared object id |
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91 | @param [out] obj_handle pointer to a shared object handle |
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92 | @param [out] mutex pointer to a mutex variable |
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93 | |||
94 | @retval 0 if the operation is succesful |
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95 | @retval FSF_ERR_BAD_ARGUMENT if obj_id, obj_handle, or mutex are NULL |
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96 | @retval FSF_ERR_SHARED_OBJ_ALREADY_INITIALIZED if the object identified |
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881 | trimarchi | 97 | by obj_id already exists |
928 | trimarchi | 98 | @retval others It may also return any of the error codes that are |
99 | returned by the pthread_mutex_init() POSIX function call |
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881 | trimarchi | 100 | */ |
101 | int fsf_init_shared_object |
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102 | (fsf_shared_obj_id_t obj_id, |
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103 | fsf_shared_obj_handle_t *obj_handle, |
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104 | pthread_mutex_t *mutex); |
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105 | |||
106 | |||
928 | trimarchi | 107 | /** |
108 | \ingroup shobjmodule |
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109 | |||
110 | Getting the handle of shared |
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111 | objects. If the object already exists a handle to the object is |
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112 | returned in the variable pointed to by obj_handle. Otherwise, an |
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113 | error code is returned by the function. |
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114 | |||
115 | @param [in] obj_id shared object id |
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116 | @param [out] obj_handle pointer to a shared object handle |
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117 | |||
118 | @retval 0 if the operation is succesful |
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119 | @retval FSF_ERR_BAD_ARGUMENT if obj_id or obj_handle are NULL |
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120 | @retval FSF_ERR_SHARED_OBJ_NOT_INITIALIZED if the shared object identified |
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881 | trimarchi | 121 | by obj_id does not exist |
928 | trimarchi | 122 | @retval FSF_ERR_NOT_SCHEDULED_CALLING_THREAD : if the calling thread is not |
881 | trimarchi | 123 | scheduled under the FSF |
928 | trimarchi | 124 | @retval FSF_ERR_INVALID_SCHEDULER_REPLY the scheduler is wrong or not |
125 | running |
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126 | @retval FSF_ERR_NOT_CONTRACTED_SERVER : if the server of the calling |
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127 | thread has been cancelled or it is not valid |
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881 | trimarchi | 128 | */ |
129 | int fsf_get_shared_object_handle |
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130 | (fsf_shared_obj_id_t obj_id, |
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131 | fsf_shared_obj_handle_t *obj_handle); |
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132 | |||
928 | trimarchi | 133 | /** |
134 | \ingroup shobjmodule |
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135 | |||
136 | Getting the mutex of shared objects. If the object exists, a |
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137 | pointer to its associated mutex is returned in the variable pointed |
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138 | to by mutex. Otherwise, an error code is returned by the function. |
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139 | |||
140 | @param [in] obj_handle shared object handle |
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141 | @param [out] mutex pointer to a pointer to a mutex variable, |
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142 | (remember that the function give back a pointer to a mutex!) |
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143 | |||
144 | @retval 0 if the operation is succesful |
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985 | julio | 145 | @retval FSF_ERR_BAD_ARGUMENT if obj_handle or mutex are NULL or obj_handle |
146 | is not correct or reference a wrong shared object |
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928 | trimarchi | 147 | @retval FSF_ERR_NOT_SCHEDULED_CALLING_THREAD : if the calling thread is not |
881 | trimarchi | 148 | scheduled under the FSF |
928 | trimarchi | 149 | @retval FSF_ERR_INVALID_SCHEDULER_REPLY the scheduler is wrong or not |
150 | running |
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151 | @retval FSF_ERR_NOT_CONTRACTED_SERVER if the server of the calling thread |
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881 | trimarchi | 152 | has been cancelled or it is not valid |
153 | */ |
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154 | int fsf_get_shared_object_mutex |
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155 | (fsf_shared_obj_handle_t obj_handle, |
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156 | pthread_mutex_t **mutex); |
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157 | |||
158 | |||
159 | ///////////////////////////////////////////////////// |
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160 | // CONTRACT PARAMETERS |
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161 | ///////////////////////////////////////////////////// |
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162 | |||
928 | trimarchi | 163 | /** |
164 | \ingroup shobjmodule |
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165 | |||
166 | The operation updates the specified contract parameters object by |
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167 | setting its critical sections to the specified input parameter. |
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168 | |||
169 | |||
170 | @param[in] contract the service contract |
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171 | @param[in] critical_sections list of critical sections accessed by tasks |
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172 | belonging to the contract |
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173 | |||
174 | @retval 0 if the operation is succesful |
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175 | @retval FSF_ERR_BAD_ARGUMENT :if any of the pointers is NULL or |
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881 | trimarchi | 176 | the size of the critical_sections structure is less than zero |
177 | or grater than FSF_MAX_N_CRITICAL_SECTIONS |
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178 | */ |
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179 | int |
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180 | fsf_set_contract_synchronization_parameters |
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181 | (fsf_contract_parameters_t *contract, |
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182 | const fsf_critical_sections_t *critical_sections); |
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183 | |||
184 | |||
928 | trimarchi | 185 | /** |
186 | \ingroup shobjmodule |
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187 | |||
188 | The operation obtains from the specified contract parameters object |
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189 | its critical sections, and copies them to the places pointed to by |
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190 | the specified input parameter. Only those critical_section_data |
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191 | records that are in use in the critical_sections structure are |
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192 | copied (according to its size field). |
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193 | |||
194 | @param[in] contract pointer to a contract |
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195 | @param[out] critical_sections list of critical sections to be filled |
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196 | |||
197 | @retval 0 if the operation is succesful |
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198 | @retval FSF_ERR_BAD_ARGUMENT if any of the pointers is NULL |
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889 | trimarchi | 199 | */ |
881 | trimarchi | 200 | int |
201 | fsf_get_contract_synchronization_parameters |
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202 | (const fsf_contract_parameters_t *contract, |
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203 | fsf_critical_sections_t *critical_sections); |
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204 | |||
205 | |||
206 | #endif // _FSF_SHARED_OBJECTS_H_ |