1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Get Pointer to Next Object that is Active |
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5 | * @ingroup ScoreObject |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-1999. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <rtems/score/objectimpl.h> |
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22 | |
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23 | /* |
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24 | * _Objects_Get_next |
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25 | * |
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26 | * Like _Objects_Get, but considers the 'id' as a "hint" and |
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27 | * finds next valid one after that point. |
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28 | * Mostly used for monitor and debug traversal of an object. |
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29 | * |
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30 | * Input parameters: |
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31 | * information - pointer to entry in table for this class |
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32 | * id - object id to search for |
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33 | * location - address of where to store the location |
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34 | * next_id - address to store next id to try |
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35 | * |
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36 | * Output parameters: |
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37 | * returns - address of object if local |
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38 | * location - one of the following: |
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39 | * OBJECTS_ERROR - invalid object ID |
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40 | * OBJECTS_REMOTE - remote object |
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41 | * OBJECTS_LOCAL - local object |
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42 | * next_id - will contain a reasonable "next" id to continue traversal |
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43 | * |
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44 | * NOTE: |
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45 | * assumes can add '1' to an id to get to next index. |
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46 | */ |
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47 | |
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48 | Objects_Control * |
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49 | _Objects_Get_next( |
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50 | Objects_Information *information, |
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51 | Objects_Id id, |
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52 | Objects_Locations *location_p, |
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53 | Objects_Id *next_id_p |
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54 | ) |
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55 | { |
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56 | Objects_Control *object; |
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57 | Objects_Id next_id; |
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58 | |
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59 | if ( !information ) |
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60 | return NULL; |
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61 | |
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62 | if ( !location_p ) |
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63 | return NULL; |
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64 | |
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65 | if ( !next_id_p ) |
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66 | return NULL; |
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67 | |
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68 | if (_Objects_Get_index(id) == OBJECTS_ID_INITIAL_INDEX) |
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69 | next_id = information->minimum_id; |
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70 | else |
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71 | next_id = id; |
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72 | |
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73 | do { |
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74 | /* walked off end of list? */ |
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75 | if (_Objects_Get_index(next_id) > information->maximum) |
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76 | { |
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77 | *location_p = OBJECTS_ERROR; |
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78 | goto final; |
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79 | } |
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80 | |
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81 | /* try to grab one */ |
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82 | object = _Objects_Get(information, next_id, location_p); |
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83 | |
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84 | next_id++; |
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85 | |
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86 | } while (*location_p != OBJECTS_LOCAL); |
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87 | |
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88 | *next_id_p = next_id; |
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89 | return object; |
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90 | |
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91 | final: |
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92 | *next_id_p = OBJECTS_ID_FINAL; |
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93 | return 0; |
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94 | } |
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