1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup ClassicSem |
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5 | * |
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6 | * @brief Classic Semaphores Implementation |
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7 | */ |
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8 | |
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9 | /* COPYRIGHT (c) 1989-2008. |
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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 | #ifndef _RTEMS_RTEMS_SEMIMPL_H |
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18 | #define _RTEMS_RTEMS_SEMIMPL_H |
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19 | |
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20 | #include <rtems/rtems/sem.h> |
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21 | #include <rtems/score/coremuteximpl.h> |
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22 | #include <rtems/score/coresemimpl.h> |
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23 | #include <rtems/score/mrspimpl.h> |
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24 | |
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25 | #ifdef __cplusplus |
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26 | extern "C" { |
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27 | #endif |
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28 | |
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29 | /** |
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30 | * @brief Classic semaphore variants. |
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31 | * |
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32 | * Must be in synchronization with Semaphore_Control::variant. |
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33 | */ |
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34 | typedef enum { |
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35 | SEMAPHORE_VARIANT_MUTEX, |
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36 | SEMAPHORE_VARIANT_MUTEX_NO_PROTOCOL, |
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37 | SEMAPHORE_VARIANT_SIMPLE_BINARY, |
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38 | SEMAPHORE_VARIANT_COUNTING |
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39 | #if defined(RTEMS_SMP) |
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40 | , |
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41 | SEMAPHORE_VARIANT_MRSP |
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42 | #endif |
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43 | } Semaphore_Variant; |
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44 | |
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45 | typedef enum { |
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46 | SEMAPHORE_DISCIPLINE_PRIORITY, |
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47 | SEMAPHORE_DISCIPLINE_FIFO |
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48 | } Semaphore_Discipline; |
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49 | |
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50 | /** |
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51 | * The following defines the information control block used to manage |
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52 | * this class of objects. |
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53 | */ |
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54 | extern Objects_Information _Semaphore_Information; |
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55 | |
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56 | RTEMS_INLINE_ROUTINE const Thread_queue_Operations *_Semaphore_Get_operations( |
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57 | const Semaphore_Control *the_semaphore |
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58 | ) |
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59 | { |
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60 | if ( the_semaphore->discipline == SEMAPHORE_DISCIPLINE_PRIORITY ) { |
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61 | return &_Thread_queue_Operations_priority; |
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62 | } else { |
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63 | return &_Thread_queue_Operations_FIFO; |
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64 | } |
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65 | } |
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66 | |
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67 | /** |
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68 | * @brief Allocates a semaphore control block from |
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69 | * the inactive chain of free semaphore control blocks. |
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70 | * |
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71 | * This function allocates a semaphore control block from |
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72 | * the inactive chain of free semaphore control blocks. |
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73 | */ |
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74 | RTEMS_INLINE_ROUTINE Semaphore_Control *_Semaphore_Allocate( void ) |
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75 | { |
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76 | return (Semaphore_Control *) _Objects_Allocate( &_Semaphore_Information ); |
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77 | } |
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78 | |
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79 | /** |
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80 | * @brief Frees a semaphore control block to the |
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81 | * inactive chain of free semaphore control blocks. |
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82 | * |
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83 | * This routine frees a semaphore control block to the |
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84 | * inactive chain of free semaphore control blocks. |
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85 | */ |
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86 | RTEMS_INLINE_ROUTINE void _Semaphore_Free ( |
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87 | Semaphore_Control *the_semaphore |
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88 | ) |
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89 | { |
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90 | _Objects_Free( &_Semaphore_Information, &the_semaphore->Object ); |
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91 | } |
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92 | |
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93 | RTEMS_INLINE_ROUTINE Semaphore_Control *_Semaphore_Get( |
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94 | Objects_Id id, |
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95 | Thread_queue_Context *queue_context |
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96 | ) |
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97 | { |
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98 | _Thread_queue_Context_initialize( queue_context ); |
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99 | return (Semaphore_Control *) _Objects_Get( |
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100 | id, |
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101 | &queue_context->Lock_context, |
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102 | &_Semaphore_Information |
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103 | ); |
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104 | } |
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105 | |
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106 | #ifdef __cplusplus |
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107 | } |
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108 | #endif |
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109 | |
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110 | #ifdef RTEMS_MULTIPROCESSING |
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111 | #include <rtems/rtems/semmp.h> |
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112 | #endif |
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113 | |
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114 | #endif |
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115 | /* end of include file */ |
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