[ac7d5ef0] | 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, 1990, 1991, 1992, 1993, 1994. |
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| 19 | * On-Line Applications Research Corporation (OAR). |
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| 20 | * All rights assigned to U.S. Government, 1994. |
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| 21 | * |
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| 22 | * This material may be reproduced by or for the U.S. Government pursuant |
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| 23 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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| 24 | * notice must appear in all copies of this file and its derivatives. |
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| 25 | * |
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| 26 | * $Id$ |
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| 27 | */ |
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| 28 | |
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| 29 | #include <rtems/system.h> |
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[3235ad9] | 30 | #include <rtems/support.h> |
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[ac7d5ef0] | 31 | #include <rtems/attr.h> |
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| 32 | #include <rtems/config.h> |
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| 33 | #include <rtems/isr.h> |
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| 34 | #include <rtems/object.h> |
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| 35 | #include <rtems/options.h> |
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| 36 | #include <rtems/sem.h> |
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| 37 | #include <rtems/states.h> |
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| 38 | #include <rtems/thread.h> |
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| 39 | #include <rtems/threadq.h> |
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| 40 | #include <rtems/mpci.h> |
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| 41 | |
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| 42 | /*PAGE |
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| 43 | * |
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| 44 | * _Semaphore_Manager_initialization |
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| 45 | * |
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| 46 | * This routine initializes all semaphore manager related data structures. |
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| 47 | * |
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| 48 | * Input parameters: |
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| 49 | * maximum_semaphores - maximum configured semaphores |
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| 50 | * |
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| 51 | * Output parameters: NONE |
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| 52 | */ |
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| 53 | |
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| 54 | void _Semaphore_Manager_initialization( |
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| 55 | unsigned32 maximum_semaphores |
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| 56 | ) |
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| 57 | { |
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| 58 | _Objects_Initialize_information( |
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| 59 | &_Semaphore_Information, |
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[3235ad9] | 60 | OBJECTS_RTEMS_SEMAPHORES, |
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[ac7d5ef0] | 61 | TRUE, |
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| 62 | maximum_semaphores, |
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[3235ad9] | 63 | sizeof( Semaphore_Control ), |
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| 64 | FALSE, |
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| 65 | RTEMS_MAXIMUM_NAME_LENGTH |
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[ac7d5ef0] | 66 | ); |
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| 67 | } |
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| 68 | |
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| 69 | /*PAGE |
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| 70 | * |
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| 71 | * rtems_semaphore_create |
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| 72 | * |
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| 73 | * This directive creates a semaphore and sets the initial value based |
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| 74 | * on the given count. A semaphore id is returned. |
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| 75 | * |
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| 76 | * Input parameters: |
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| 77 | * name - user defined semaphore name |
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| 78 | * count - initial count of semaphore |
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| 79 | * attribute_set - semaphore attributes |
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| 80 | * id - pointer to semaphore id |
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| 81 | * |
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| 82 | * Output parameters: |
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| 83 | * id - semaphore id |
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| 84 | * RTEMS_SUCCESSFUL - if successful |
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| 85 | * error code - if unsuccessful |
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| 86 | */ |
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| 87 | |
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| 88 | rtems_status_code rtems_semaphore_create( |
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[3235ad9] | 89 | rtems_name name, |
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[ac7d5ef0] | 90 | unsigned32 count, |
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| 91 | rtems_attribute attribute_set, |
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| 92 | Objects_Id *id |
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| 93 | ) |
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| 94 | { |
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| 95 | register Semaphore_Control *the_semaphore; |
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| 96 | |
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[3235ad9] | 97 | if ( !rtems_is_name_valid( name ) ) |
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[ac7d5ef0] | 98 | return ( RTEMS_INVALID_NAME ); |
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| 99 | |
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| 100 | if ( _Attributes_Is_global( attribute_set ) ) { |
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| 101 | |
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| 102 | if ( !_Configuration_Is_multiprocessing() ) |
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| 103 | return( RTEMS_MP_NOT_CONFIGURED ); |
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| 104 | |
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| 105 | if ( _Attributes_Is_inherit_priority( attribute_set ) ) |
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| 106 | return( RTEMS_NOT_DEFINED ); |
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| 107 | |
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| 108 | } else if ( _Attributes_Is_inherit_priority( attribute_set ) ) { |
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| 109 | |
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| 110 | if ( ! ( _Attributes_Is_binary_semaphore( attribute_set ) && |
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| 111 | _Attributes_Is_priority( attribute_set ) ) ) |
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| 112 | return( RTEMS_NOT_DEFINED ); |
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| 113 | |
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| 114 | } |
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| 115 | |
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| 116 | if ( _Attributes_Is_binary_semaphore( attribute_set ) && ( count > 1 ) ) |
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| 117 | return( RTEMS_INVALID_NUMBER ); |
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| 118 | |
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| 119 | _Thread_Disable_dispatch(); /* prevents deletion */ |
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| 120 | |
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| 121 | the_semaphore = _Semaphore_Allocate(); |
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| 122 | |
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| 123 | if ( !the_semaphore ) { |
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| 124 | _Thread_Enable_dispatch(); |
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| 125 | return( RTEMS_TOO_MANY ); |
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| 126 | } |
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| 127 | |
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| 128 | if ( _Attributes_Is_global( attribute_set ) && |
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| 129 | !( _Objects_MP_Open( &_Semaphore_Information, name, |
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| 130 | the_semaphore->Object.id, FALSE ) ) ) { |
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| 131 | _Semaphore_Free( the_semaphore ); |
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| 132 | _Thread_Enable_dispatch(); |
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| 133 | return( RTEMS_TOO_MANY ); |
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| 134 | } |
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| 135 | |
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| 136 | the_semaphore->attribute_set = attribute_set; |
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| 137 | the_semaphore->count = count; |
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| 138 | |
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| 139 | if ( _Attributes_Is_binary_semaphore( attribute_set ) && count == 0 ) { |
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| 140 | the_semaphore->nest_count = 1; |
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| 141 | the_semaphore->holder = _Thread_Executing; |
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| 142 | the_semaphore->holder_id = _Thread_Executing->Object.id; |
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| 143 | _Thread_Executing->resource_count++; |
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| 144 | } else { |
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| 145 | the_semaphore->nest_count = 0; |
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| 146 | the_semaphore->holder = NULL; |
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| 147 | the_semaphore->holder_id = 0; |
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| 148 | } |
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| 149 | |
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| 150 | _Thread_queue_Initialize( &the_semaphore->Wait_queue, |
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| 151 | attribute_set, STATES_WAITING_FOR_SEMAPHORE ); |
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| 152 | |
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[3235ad9] | 153 | _Objects_Open( &_Semaphore_Information, &the_semaphore->Object, &name ); |
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[ac7d5ef0] | 154 | |
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| 155 | *id = the_semaphore->Object.id; |
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| 156 | |
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| 157 | if ( _Attributes_Is_global( attribute_set ) ) |
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| 158 | _Semaphore_MP_Send_process_packet( |
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| 159 | SEMAPHORE_MP_ANNOUNCE_CREATE, |
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| 160 | the_semaphore->Object.id, |
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| 161 | name, |
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| 162 | 0 /* Not used */ |
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| 163 | ); |
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| 164 | _Thread_Enable_dispatch(); |
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| 165 | return( RTEMS_SUCCESSFUL ); |
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| 166 | } |
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| 167 | |
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| 168 | /*PAGE |
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| 169 | * |
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| 170 | * rtems_semaphore_ident |
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| 171 | * |
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| 172 | * This directive returns the system ID associated with |
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| 173 | * the semaphore name. |
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| 174 | * |
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| 175 | * Input parameters: |
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| 176 | * name - user defined semaphore name |
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| 177 | * node - node(s) to be searched |
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| 178 | * id - pointer to semaphore id |
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| 179 | * |
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| 180 | * Output parameters: |
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| 181 | * *id - semaphore id |
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| 182 | * RTEMS_SUCCESSFUL - if successful |
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| 183 | * error code - if unsuccessful |
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| 184 | */ |
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| 185 | |
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| 186 | rtems_status_code rtems_semaphore_ident( |
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[3235ad9] | 187 | rtems_name name, |
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[ac7d5ef0] | 188 | unsigned32 node, |
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| 189 | Objects_Id *id |
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| 190 | ) |
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| 191 | { |
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[3235ad9] | 192 | return( _Objects_Name_to_id( &_Semaphore_Information, &name, node, id ) ); |
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[ac7d5ef0] | 193 | } |
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| 194 | |
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| 195 | /*PAGE |
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| 196 | * |
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| 197 | * rtems_semaphore_delete |
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| 198 | * |
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| 199 | * This directive allows a thread to delete a semaphore specified by |
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| 200 | * the semaphore id. The semaphore is freed back to the inactive |
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| 201 | * semaphore chain. |
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| 202 | * |
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| 203 | * Input parameters: |
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| 204 | * id - semaphore id |
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| 205 | * |
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| 206 | * Output parameters: |
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| 207 | * RTEMS_SUCCESSFUL - if successful |
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| 208 | * error code - if unsuccessful |
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| 209 | */ |
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| 210 | |
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| 211 | rtems_status_code rtems_semaphore_delete( |
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| 212 | Objects_Id id |
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| 213 | ) |
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| 214 | { |
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| 215 | register Semaphore_Control *the_semaphore; |
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| 216 | Objects_Locations location; |
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| 217 | |
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| 218 | the_semaphore = _Semaphore_Get( id, &location ); |
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| 219 | switch ( location ) { |
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| 220 | case OBJECTS_ERROR: |
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| 221 | return( RTEMS_INVALID_ID ); |
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| 222 | case OBJECTS_REMOTE: |
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| 223 | _Thread_Dispatch(); |
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| 224 | return( RTEMS_ILLEGAL_ON_REMOTE_OBJECT ); |
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| 225 | case OBJECTS_LOCAL: |
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| 226 | if ( _Attributes_Is_binary_semaphore( the_semaphore->attribute_set) && |
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| 227 | ( the_semaphore->count == 0 ) ) { |
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| 228 | _Thread_Enable_dispatch(); |
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| 229 | return( RTEMS_RESOURCE_IN_USE ); |
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| 230 | } |
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| 231 | |
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| 232 | _Objects_Close( &_Semaphore_Information, &the_semaphore->Object ); |
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| 233 | |
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| 234 | _Thread_queue_Flush( |
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| 235 | &the_semaphore->Wait_queue, |
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| 236 | _Semaphore_MP_Send_object_was_deleted |
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| 237 | ); |
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| 238 | |
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| 239 | _Semaphore_Free( the_semaphore ); |
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| 240 | |
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| 241 | if ( _Attributes_Is_global( the_semaphore->attribute_set ) ) { |
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| 242 | |
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| 243 | _Objects_MP_Close( &_Semaphore_Information, the_semaphore->Object.id ); |
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| 244 | |
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| 245 | _Semaphore_MP_Send_process_packet( |
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| 246 | SEMAPHORE_MP_ANNOUNCE_DELETE, |
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| 247 | the_semaphore->Object.id, |
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| 248 | 0, /* Not used */ |
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| 249 | 0 /* Not used */ |
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| 250 | ); |
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| 251 | } |
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| 252 | _Thread_Enable_dispatch(); |
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| 253 | return( RTEMS_SUCCESSFUL ); |
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| 254 | } |
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| 255 | |
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| 256 | return( RTEMS_INTERNAL_ERROR ); /* unreached - only to remove warnings */ |
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| 257 | } |
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| 258 | |
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| 259 | /*PAGE |
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| 260 | * |
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| 261 | * rtems_semaphore_obtain |
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| 262 | * |
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| 263 | * This directive allows a thread to acquire a semaphore. |
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| 264 | * |
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| 265 | * Input parameters: |
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| 266 | * id - semaphore id |
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| 267 | * option_set - wait option |
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| 268 | * timeout - number of ticks to wait (0 means wait forever) |
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| 269 | * |
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| 270 | * Output parameters: |
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| 271 | * RTEMS_SUCCESSFUL - if successful |
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| 272 | * error code - if unsuccessful |
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| 273 | */ |
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| 274 | |
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| 275 | rtems_status_code rtems_semaphore_obtain( |
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| 276 | Objects_Id id, |
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| 277 | unsigned32 option_set, |
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| 278 | rtems_interval timeout |
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| 279 | ) |
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| 280 | { |
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| 281 | register Semaphore_Control *the_semaphore; |
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| 282 | Objects_Locations location; |
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| 283 | |
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| 284 | the_semaphore = _Semaphore_Get( id, &location ); |
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| 285 | switch ( location ) { |
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| 286 | case OBJECTS_ERROR: |
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| 287 | return( RTEMS_INVALID_ID ); |
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| 288 | case OBJECTS_REMOTE: |
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| 289 | return _Semaphore_MP_Send_request_packet( |
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| 290 | SEMAPHORE_MP_OBTAIN_REQUEST, |
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| 291 | id, |
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| 292 | option_set, |
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| 293 | timeout |
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| 294 | ); |
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| 295 | case OBJECTS_LOCAL: |
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| 296 | if ( !_Semaphore_Seize( the_semaphore, option_set ) ) { |
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| 297 | if ( _Attributes_Is_inherit_priority( the_semaphore->attribute_set ) && |
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| 298 | the_semaphore->holder->current_priority > |
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| 299 | _Thread_Executing->current_priority ) { |
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| 300 | _Thread_Change_priority( |
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| 301 | the_semaphore->holder, _Thread_Executing->current_priority ); |
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| 302 | } |
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| 303 | _Thread_queue_Enqueue( &the_semaphore->Wait_queue, timeout ); |
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| 304 | } |
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| 305 | _Thread_Enable_dispatch(); |
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| 306 | return( _Thread_Executing->Wait.return_code ); |
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| 307 | } |
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| 308 | |
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| 309 | return( RTEMS_INTERNAL_ERROR ); /* unreached - only to remove warnings */ |
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| 310 | } |
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| 311 | |
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| 312 | /*PAGE |
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| 313 | * |
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| 314 | * rtems_semaphore_release |
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| 315 | * |
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| 316 | * This directive allows a thread to release a semaphore. |
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| 317 | * |
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| 318 | * Input parameters: |
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| 319 | * id - semaphore id |
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| 320 | * |
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| 321 | * Output parameters: |
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| 322 | * RTEMS_SUCCESSFUL - if successful |
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| 323 | * error code - if unsuccessful |
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| 324 | */ |
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| 325 | |
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| 326 | rtems_status_code rtems_semaphore_release( |
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| 327 | Objects_Id id |
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| 328 | ) |
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| 329 | { |
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| 330 | register Semaphore_Control *the_semaphore; |
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| 331 | Objects_Locations location; |
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| 332 | Thread_Control *the_thread; |
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| 333 | |
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| 334 | the_semaphore = _Semaphore_Get( id, &location ); |
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| 335 | switch ( location ) { |
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| 336 | case OBJECTS_ERROR: |
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| 337 | return( RTEMS_INVALID_ID ); |
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| 338 | case OBJECTS_REMOTE: |
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| 339 | return( |
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| 340 | _Semaphore_MP_Send_request_packet( |
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| 341 | SEMAPHORE_MP_RELEASE_REQUEST, |
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| 342 | id, |
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| 343 | 0, /* Not used */ |
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| 344 | MPCI_DEFAULT_TIMEOUT |
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| 345 | ) |
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| 346 | ); |
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| 347 | case OBJECTS_LOCAL: |
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| 348 | if ( _Attributes_Is_binary_semaphore( the_semaphore->attribute_set)) { |
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| 349 | |
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| 350 | if ( !_Objects_Are_ids_equal( |
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| 351 | _Thread_Executing->Object.id, the_semaphore->holder_id ) ) { |
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| 352 | _Thread_Enable_dispatch(); |
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| 353 | return( RTEMS_NOT_OWNER_OF_RESOURCE ); |
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| 354 | } |
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| 355 | |
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| 356 | the_semaphore->nest_count--; |
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| 357 | |
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| 358 | if ( the_semaphore->nest_count != 0 ) { |
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| 359 | _Thread_Enable_dispatch(); |
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| 360 | return( RTEMS_SUCCESSFUL ); |
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| 361 | } |
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| 362 | |
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| 363 | _Thread_Executing->resource_count--; |
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| 364 | the_semaphore->holder = NULL; |
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| 365 | the_semaphore->holder_id = 0; |
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| 366 | |
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| 367 | /* |
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| 368 | * Whether or not someone is waiting for the semaphore, an |
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| 369 | * inherited priority must be lowered if this is the last |
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| 370 | * semaphore (i.e. resource) this task has. |
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| 371 | */ |
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| 372 | |
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| 373 | if ( _Attributes_Is_inherit_priority(the_semaphore->attribute_set) && |
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| 374 | _Thread_Executing->resource_count == 0 && |
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| 375 | _Thread_Executing->real_priority != |
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| 376 | _Thread_Executing->current_priority ) { |
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| 377 | _Thread_Change_priority( |
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| 378 | _Thread_Executing, _Thread_Executing->real_priority ); |
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| 379 | } |
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| 380 | |
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| 381 | } |
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| 382 | |
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| 383 | if ( (the_thread = _Thread_queue_Dequeue(&the_semaphore->Wait_queue)) ) { |
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| 384 | |
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| 385 | if ( !_Objects_Is_local_id( the_thread->Object.id ) ) { |
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| 386 | the_thread->receive_packet->return_code = RTEMS_SUCCESSFUL; |
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| 387 | |
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| 388 | if ( _Attributes_Is_binary_semaphore(the_semaphore->attribute_set) ) { |
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| 389 | the_semaphore->holder = NULL; |
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| 390 | the_semaphore->holder_id = the_thread->Object.id; |
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| 391 | the_semaphore->nest_count = 1; |
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| 392 | } |
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| 393 | |
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| 394 | _Semaphore_MP_Send_response_packet( |
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| 395 | SEMAPHORE_MP_OBTAIN_RESPONSE, |
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| 396 | id, |
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| 397 | the_thread |
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| 398 | ); |
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| 399 | } else { |
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| 400 | |
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| 401 | if ( _Attributes_Is_binary_semaphore(the_semaphore->attribute_set) ) { |
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| 402 | the_semaphore->holder = the_thread; |
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| 403 | the_semaphore->holder_id = the_thread->Object.id; |
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| 404 | the_thread->resource_count++; |
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| 405 | the_semaphore->nest_count = 1; |
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| 406 | } |
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| 407 | |
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| 408 | /* |
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| 409 | * No special action for priority inheritance because the_thread |
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| 410 | * is guaranteed to be the highest priority thread waiting for |
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| 411 | * the semaphore. |
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| 412 | */ |
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| 413 | } |
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| 414 | } else |
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| 415 | the_semaphore->count += 1; |
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| 416 | |
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| 417 | _Thread_Enable_dispatch(); |
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| 418 | return( RTEMS_SUCCESSFUL ); |
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| 419 | } |
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| 420 | |
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| 421 | return( RTEMS_INTERNAL_ERROR ); /* unreached - only to remove warnings */ |
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| 422 | } |
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| 423 | |
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| 424 | /*PAGE |
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| 425 | * |
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| 426 | * _Semaphore_Seize |
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| 427 | * |
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| 428 | * This routine attempts to allocate a semaphore to the calling thread. |
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| 429 | * |
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| 430 | * Input parameters: |
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| 431 | * the_semaphore - pointer to semaphore control block |
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| 432 | * option_set - acquire semaphore options |
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| 433 | * |
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| 434 | * Output parameters: |
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| 435 | * TRUE - if semaphore allocated |
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| 436 | * FALSE - if semaphore NOT allocated |
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| 437 | * |
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| 438 | * INTERRUPT LATENCY: |
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| 439 | * available |
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| 440 | * wait |
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| 441 | */ |
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| 442 | |
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| 443 | boolean _Semaphore_Seize( |
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| 444 | Semaphore_Control *the_semaphore, |
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| 445 | rtems_option option_set |
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| 446 | ) |
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| 447 | { |
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| 448 | Thread_Control *executing; |
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| 449 | ISR_Level level; |
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| 450 | |
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| 451 | executing = _Thread_Executing; |
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| 452 | executing->Wait.return_code = RTEMS_SUCCESSFUL; |
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| 453 | _ISR_Disable( level ); |
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| 454 | if ( the_semaphore->count != 0 ) { |
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| 455 | the_semaphore->count -= 1; |
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| 456 | if ( _Attributes_Is_binary_semaphore( the_semaphore->attribute_set ) ) { |
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| 457 | the_semaphore->holder = executing; |
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| 458 | the_semaphore->holder_id = executing->Object.id; |
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| 459 | the_semaphore->nest_count = 1; |
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| 460 | executing->resource_count++; |
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| 461 | } |
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| 462 | _ISR_Enable( level ); |
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| 463 | return( TRUE ); |
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| 464 | } |
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| 465 | |
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| 466 | if ( _Options_Is_no_wait( option_set ) ) { |
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| 467 | _ISR_Enable( level ); |
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| 468 | executing->Wait.return_code = RTEMS_UNSATISFIED; |
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| 469 | return( TRUE ); |
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| 470 | } |
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| 471 | |
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| 472 | if ( _Attributes_Is_binary_semaphore( the_semaphore->attribute_set ) ) { |
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| 473 | if ( _Objects_Are_ids_equal( |
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| 474 | _Thread_Executing->Object.id, the_semaphore->holder_id ) ) { |
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| 475 | the_semaphore->nest_count++; |
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| 476 | _ISR_Enable( level ); |
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| 477 | return( TRUE ); |
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| 478 | } |
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| 479 | } |
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| 480 | |
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| 481 | the_semaphore->Wait_queue.sync = TRUE; |
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| 482 | executing->Wait.queue = &the_semaphore->Wait_queue; |
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| 483 | executing->Wait.id = the_semaphore->Object.id; |
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| 484 | executing->Wait.option_set = option_set; |
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| 485 | _ISR_Enable( level ); |
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| 486 | return( FALSE ); |
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| 487 | } |
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