1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief RTEMS Semaphore Release |
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5 | * @ingroup ClassicSem Semaphores |
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6 | * |
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7 | * This file contains the implementation of the Classic API directive |
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8 | * rtems_semaphore_release(). |
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9 | */ |
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10 | |
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11 | /* |
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12 | * COPYRIGHT (c) 1989-2014. |
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13 | * On-Line Applications Research Corporation (OAR). |
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14 | * |
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15 | * The license and distribution terms for this file may be |
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16 | * found in the file LICENSE in this distribution or at |
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17 | * http://www.rtems.org/license/LICENSE. |
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18 | */ |
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19 | |
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20 | #if HAVE_CONFIG_H |
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21 | #include "config.h" |
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22 | #endif |
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23 | |
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24 | #include <rtems/rtems/semimpl.h> |
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25 | #include <rtems/rtems/statusimpl.h> |
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26 | |
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27 | rtems_status_code rtems_semaphore_release( rtems_id id ) |
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28 | { |
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29 | Semaphore_Control *the_semaphore; |
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30 | Thread_queue_Context queue_context; |
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31 | Thread_Control *executing; |
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32 | Status_Control status; |
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33 | |
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34 | the_semaphore = _Semaphore_Get( id, &queue_context ); |
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35 | |
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36 | if ( the_semaphore == NULL ) { |
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37 | #if defined(RTEMS_MULTIPROCESSING) |
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38 | return _Semaphore_MP_Release( id ); |
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39 | #else |
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40 | return RTEMS_INVALID_ID; |
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41 | #endif |
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42 | } |
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43 | |
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44 | executing = _Thread_Executing; |
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45 | |
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46 | _Thread_queue_Context_set_MP_callout( |
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47 | &queue_context, |
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48 | _Semaphore_Core_mutex_mp_support |
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49 | ); |
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50 | |
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51 | switch ( the_semaphore->variant ) { |
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52 | #if defined(RTEMS_SMP) |
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53 | case SEMAPHORE_VARIANT_MRSP: |
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54 | status = _MRSP_Surrender( |
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55 | &the_semaphore->Core_control.mrsp, |
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56 | executing, |
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57 | &queue_context |
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58 | ); |
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59 | break; |
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60 | #endif |
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61 | case SEMAPHORE_VARIANT_MUTEX: |
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62 | status = _CORE_mutex_Surrender( |
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63 | &the_semaphore->Core_control.Mutex.Recursive.Mutex, |
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64 | &queue_context |
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65 | ); |
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66 | break; |
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67 | case SEMAPHORE_VARIANT_MUTEX_PRIORITY_CEILING: |
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68 | status = _CORE_ceiling_mutex_Surrender( |
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69 | &the_semaphore->Core_control.Mutex, |
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70 | executing, |
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71 | &queue_context |
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72 | ); |
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73 | break; |
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74 | case SEMAPHORE_VARIANT_MUTEX_NO_PROTOCOL: |
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75 | _CORE_recursive_mutex_Surrender_no_protocol_classic( |
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76 | &the_semaphore->Core_control.Mutex.Recursive, |
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77 | _Semaphore_Get_operations( the_semaphore ), |
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78 | &queue_context |
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79 | ); |
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80 | status = STATUS_SUCCESSFUL; |
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81 | break; |
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82 | case SEMAPHORE_VARIANT_SIMPLE_BINARY: |
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83 | status = _CORE_semaphore_Surrender( |
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84 | &the_semaphore->Core_control.semaphore, |
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85 | _Semaphore_Get_operations( the_semaphore ), |
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86 | 1, |
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87 | &queue_context |
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88 | ); |
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89 | _Assert( |
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90 | status == STATUS_SUCCESSFUL |
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91 | || status == STATUS_MAXIMUM_COUNT_EXCEEDED |
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92 | ); |
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93 | status = STATUS_SUCCESSFUL; |
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94 | break; |
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95 | default: |
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96 | _Assert( the_semaphore->variant == SEMAPHORE_VARIANT_COUNTING ); |
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97 | status = _CORE_semaphore_Surrender( |
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98 | &the_semaphore->Core_control.semaphore, |
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99 | _Semaphore_Get_operations( the_semaphore ), |
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100 | UINT32_MAX, |
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101 | &queue_context |
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102 | ); |
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103 | break; |
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104 | } |
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105 | |
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106 | return _Status_Get( status ); |
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107 | } |
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