1 | /* |
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2 | * Semaphore Manager |
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3 | * |
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4 | * DESCRIPTION: |
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5 | * |
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6 | * This package is the implementation of the Semaphore Manager. |
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7 | * This manager utilizes standard Dijkstra counting semaphores to provide |
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8 | * synchronization and mutual exclusion capabilities. |
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9 | * |
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10 | * Directives provided are: |
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11 | * |
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12 | * + create a semaphore |
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13 | * + get an ID of a semaphore |
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14 | * + delete a semaphore |
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15 | * + acquire a semaphore |
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16 | * + release a semaphore |
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17 | * |
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18 | * COPYRIGHT (c) 1989-1999. |
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19 | * On-Line Applications Research Corporation (OAR). |
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20 | * |
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21 | * The license and distribution terms for this file may be |
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22 | * found in the file LICENSE in this distribution or at |
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23 | * http://www.OARcorp.com/rtems/license.html. |
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24 | * |
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25 | * $Id$ |
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26 | */ |
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27 | |
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28 | #include <rtems/system.h> |
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29 | #include <rtems/rtems/status.h> |
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30 | #include <rtems/rtems/support.h> |
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31 | #include <rtems/rtems/attr.h> |
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32 | #include <rtems/score/isr.h> |
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33 | #include <rtems/score/object.h> |
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34 | #include <rtems/rtems/options.h> |
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35 | #include <rtems/rtems/sem.h> |
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36 | #include <rtems/score/coremutex.h> |
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37 | #include <rtems/score/coresem.h> |
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38 | #include <rtems/score/states.h> |
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39 | #include <rtems/score/thread.h> |
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40 | #include <rtems/score/threadq.h> |
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41 | #if defined(RTEMS_MULTIPROCESSING) |
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42 | #include <rtems/score/mpci.h> |
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43 | #endif |
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44 | #include <rtems/score/sysstate.h> |
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45 | |
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46 | #include <rtems/score/interr.h> |
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47 | |
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48 | /*PAGE |
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49 | * |
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50 | * rtems_semaphore_delete |
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51 | * |
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52 | * This directive allows a thread to delete a semaphore specified by |
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53 | * the semaphore id. The semaphore is freed back to the inactive |
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54 | * semaphore chain. |
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55 | * |
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56 | * Input parameters: |
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57 | * id - semaphore id |
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58 | * |
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59 | * Output parameters: |
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60 | * RTEMS_SUCCESSFUL - if successful |
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61 | * error code - if unsuccessful |
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62 | */ |
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63 | |
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64 | rtems_status_code rtems_semaphore_delete( |
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65 | Objects_Id id |
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66 | ) |
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67 | { |
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68 | register Semaphore_Control *the_semaphore; |
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69 | Objects_Locations location; |
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70 | |
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71 | the_semaphore = _Semaphore_Get( id, &location ); |
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72 | switch ( location ) { |
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73 | |
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74 | case OBJECTS_REMOTE: |
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75 | #if defined(RTEMS_MULTIPROCESSING) |
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76 | _Thread_Dispatch(); |
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77 | return RTEMS_ILLEGAL_ON_REMOTE_OBJECT; |
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78 | #endif |
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79 | |
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80 | case OBJECTS_ERROR: |
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81 | return RTEMS_INVALID_ID; |
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82 | |
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83 | case OBJECTS_LOCAL: |
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84 | if ( !_Attributes_Is_counting_semaphore(the_semaphore->attribute_set) ) { |
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85 | if ( _CORE_mutex_Is_locked( &the_semaphore->Core_control.mutex ) ) { |
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86 | _Thread_Enable_dispatch(); |
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87 | return RTEMS_RESOURCE_IN_USE; |
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88 | } |
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89 | else |
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90 | _CORE_mutex_Flush( |
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91 | &the_semaphore->Core_control.mutex, |
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92 | #if defined(RTEMS_MULTIPROCESSING) |
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93 | _Semaphore_MP_Send_object_was_deleted, |
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94 | #else |
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95 | NULL, |
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96 | #endif |
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97 | CORE_MUTEX_WAS_DELETED |
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98 | ); |
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99 | } |
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100 | else |
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101 | _CORE_semaphore_Flush( |
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102 | &the_semaphore->Core_control.semaphore, |
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103 | #if defined(RTEMS_MULTIPROCESSING) |
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104 | _Semaphore_MP_Send_object_was_deleted, |
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105 | #else |
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106 | NULL, |
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107 | #endif |
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108 | CORE_SEMAPHORE_WAS_DELETED |
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109 | ); |
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110 | |
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111 | _Objects_Close( &_Semaphore_Information, &the_semaphore->Object ); |
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112 | |
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113 | _Semaphore_Free( the_semaphore ); |
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114 | |
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115 | #if defined(RTEMS_MULTIPROCESSING) |
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116 | if ( _Attributes_Is_global( the_semaphore->attribute_set ) ) { |
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117 | |
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118 | _Objects_MP_Close( &_Semaphore_Information, the_semaphore->Object.id ); |
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119 | |
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120 | _Semaphore_MP_Send_process_packet( |
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121 | SEMAPHORE_MP_ANNOUNCE_DELETE, |
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122 | the_semaphore->Object.id, |
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123 | 0, /* Not used */ |
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124 | 0 /* Not used */ |
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125 | ); |
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126 | } |
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127 | #endif |
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128 | _Thread_Enable_dispatch(); |
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129 | return RTEMS_SUCCESSFUL; |
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130 | } |
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131 | |
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132 | return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ |
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133 | } |
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