1 | /* rtems/posix/semaphore.h |
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2 | * |
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3 | * This include file contains all the private support information for |
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4 | * POSIX Semaphores. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1998. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * Copyright assigned to U.S. Government, 1994. |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.OARcorp.com/rtems/license.html. |
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13 | * |
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14 | * $Id$ |
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15 | */ |
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16 | |
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17 | #ifndef __RTEMS_POSIX_SEMAPHORE_h |
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18 | #define __RTEMS_POSIX_SEMAPHORE_h |
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19 | |
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20 | #ifdef __cplusplus |
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21 | extern "C" { |
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22 | #endif |
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23 | |
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24 | #include <rtems/score/coresem.h> |
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25 | |
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26 | #define SEM_FAILED (sem_t *) -1 |
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27 | |
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28 | /* |
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29 | * Data Structure used to manage a POSIX semaphore |
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30 | */ |
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31 | |
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32 | typedef struct { |
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33 | Objects_Control Object; |
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34 | int process_shared; |
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35 | boolean named; |
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36 | boolean linked; |
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37 | unsigned32 open_count; |
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38 | CORE_semaphore_Control Semaphore; |
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39 | } POSIX_Semaphore_Control; |
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40 | |
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41 | /* |
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42 | * The following defines the information control block used to manage |
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43 | * this class of objects. |
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44 | */ |
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45 | |
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46 | POSIX_EXTERN Objects_Information _POSIX_Semaphore_Information; |
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47 | |
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48 | /* |
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49 | * _POSIX_Semaphore_Manager_initialization |
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50 | * |
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51 | * DESCRIPTION: |
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52 | * |
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53 | * This routine performs the initialization necessary for this manager. |
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54 | */ |
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55 | |
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56 | void _POSIX_Semaphore_Manager_initialization( |
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57 | unsigned32 maximum_semaphorees |
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58 | ); |
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59 | |
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60 | /* |
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61 | * _POSIX_Semaphore_Allocate |
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62 | * |
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63 | * DESCRIPTION: |
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64 | * |
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65 | * This function allocates a semaphore control block from |
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66 | * the inactive chain of free semaphore control blocks. |
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67 | */ |
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68 | |
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69 | RTEMS_INLINE_ROUTINE POSIX_Semaphore_Control *_POSIX_Semaphore_Allocate( void ); |
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70 | |
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71 | /* |
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72 | * _POSIX_Semaphore_Free |
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73 | * |
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74 | * DESCRIPTION: |
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75 | * |
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76 | * This routine frees a semaphore control block to the |
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77 | * inactive chain of free semaphore control blocks. |
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78 | */ |
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79 | |
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80 | RTEMS_INLINE_ROUTINE void _POSIX_Semaphore_Free ( |
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81 | POSIX_Semaphore_Control *the_semaphore |
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82 | ); |
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83 | |
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84 | /* |
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85 | * _POSIX_Semaphore_Get |
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86 | * |
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87 | * DESCRIPTION: |
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88 | * |
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89 | * This function maps semaphore IDs to semaphore control blocks. |
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90 | * If ID corresponds to a local semaphore, then it returns |
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91 | * the_semaphore control pointer which maps to ID and location |
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92 | * is set to OBJECTS_LOCAL. if the semaphore ID is global and |
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93 | * resides on a remote node, then location is set to OBJECTS_REMOTE, |
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94 | * and the_semaphore is undefined. Otherwise, location is set |
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95 | * to OBJECTS_ERROR and the_semaphore is undefined. |
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96 | */ |
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97 | |
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98 | RTEMS_INLINE_ROUTINE POSIX_Semaphore_Control *_POSIX_Semaphore_Get ( |
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99 | Objects_Id *id, |
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100 | Objects_Locations *location |
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101 | ); |
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102 | |
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103 | /* |
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104 | * _POSIX_Semaphore_Is_null |
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105 | * |
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106 | * DESCRIPTION: |
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107 | * |
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108 | * This function returns TRUE if the_semaphore is NULL and FALSE otherwise. |
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109 | */ |
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110 | |
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111 | RTEMS_INLINE_ROUTINE boolean _POSIX_Semaphore_Is_null ( |
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112 | POSIX_Semaphore_Control *the_semaphore |
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113 | ); |
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114 | |
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115 | /* |
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116 | * _POSIX_Semaphore_Name_to_id |
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117 | * |
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118 | * DESCRIPTION: |
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119 | * |
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120 | * XXX |
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121 | */ |
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122 | |
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123 | int _POSIX_Semaphore_Name_to_id( |
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124 | const char *name, |
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125 | Objects_Id *id |
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126 | ); |
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127 | |
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128 | #include <rtems/posix/semaphore.inl> |
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129 | #if defined(RTEMS_MULTIPROCESSING) |
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130 | #include <rtems/posix/semaphoremp.h> |
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131 | #endif |
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132 | |
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133 | #ifdef __cplusplus |
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134 | } |
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135 | #endif |
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136 | |
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137 | #endif |
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138 | /* end of include file */ |
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139 | |
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