[7f72217e] | 1 | /* |
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[eb5a7e07] | 2 | * $Id$ |
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[5e9b32b] | 3 | */ |
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| 4 | |
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| 5 | #include <stdarg.h> |
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| 6 | |
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| 7 | #include <errno.h> |
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| 8 | #include <fcntl.h> |
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| 9 | #include <pthread.h> |
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| 10 | #include <semaphore.h> |
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| 11 | #include <limits.h> |
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| 12 | |
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| 13 | #include <rtems/system.h> |
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| 14 | #include <rtems/score/object.h> |
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| 15 | #include <rtems/posix/semaphore.h> |
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| 16 | #include <rtems/posix/time.h> |
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| 17 | |
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| 18 | /*PAGE |
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| 19 | * |
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| 20 | * _POSIX_Semaphore_Manager_initialization |
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| 21 | * |
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| 22 | * This routine initializes all semaphore manager related data structures. |
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| 23 | * |
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| 24 | * Input parameters: |
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| 25 | * maximum_semaphores - maximum configured semaphores |
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| 26 | * |
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| 27 | * Output parameters: NONE |
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| 28 | */ |
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| 29 | |
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| 30 | void _POSIX_Semaphore_Manager_initialization( |
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| 31 | unsigned32 maximum_semaphores |
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| 32 | ) |
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| 33 | { |
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| 34 | _Objects_Initialize_information( |
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| 35 | &_POSIX_Semaphore_Information, |
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| 36 | OBJECTS_POSIX_SEMAPHORES, |
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| 37 | TRUE, |
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| 38 | maximum_semaphores, |
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| 39 | sizeof( POSIX_Semaphore_Control ), |
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| 40 | TRUE, |
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| 41 | _POSIX_PATH_MAX, |
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| 42 | FALSE |
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| 43 | ); |
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| 44 | } |
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| 45 | |
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| 46 | /*PAGE |
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| 47 | * |
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| 48 | * _POSIX_Semaphore_Create_support |
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| 49 | */ |
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| 50 | |
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| 51 | int _POSIX_Semaphore_Create_support( |
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| 52 | const char *name, |
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| 53 | int pshared, |
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| 54 | unsigned int value, |
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| 55 | POSIX_Semaphore_Control **the_sem |
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| 56 | ) |
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| 57 | { |
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| 58 | POSIX_Semaphore_Control *the_semaphore; |
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| 59 | CORE_semaphore_Attributes *the_sem_attr; |
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| 60 | |
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| 61 | _Thread_Disable_dispatch(); |
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| 62 | |
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| 63 | the_semaphore = _POSIX_Semaphore_Allocate(); |
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| 64 | |
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| 65 | if ( !the_semaphore ) { |
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| 66 | _Thread_Enable_dispatch(); |
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[05ce4e09] | 67 | set_errno_and_return_minus_one( ENOMEM ); |
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[5e9b32b] | 68 | } |
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| 69 | |
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| 70 | if ( pshared == PTHREAD_PROCESS_SHARED && |
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| 71 | !( _Objects_MP_Allocate_and_open( &_POSIX_Semaphore_Information, 0, |
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| 72 | the_semaphore->Object.id, FALSE ) ) ) { |
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| 73 | _POSIX_Semaphore_Free( the_semaphore ); |
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| 74 | _Thread_Enable_dispatch(); |
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[05ce4e09] | 75 | set_errno_and_return_minus_one( EAGAIN ); |
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[5e9b32b] | 76 | } |
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| 77 | |
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| 78 | the_semaphore->process_shared = pshared; |
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| 79 | |
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| 80 | if ( name ) { |
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| 81 | the_semaphore->named = TRUE; |
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| 82 | the_semaphore->open_count = 1; |
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| 83 | the_semaphore->linked = TRUE; |
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| 84 | } |
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| 85 | else |
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| 86 | the_semaphore->named = FALSE; |
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| 87 | |
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| 88 | the_sem_attr = &the_semaphore->Semaphore.Attributes; |
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| 89 | |
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| 90 | /* XXX |
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| 91 | * |
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| 92 | * Note should this be based on the current scheduling policy? |
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| 93 | */ |
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| 94 | |
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| 95 | the_sem_attr->discipline = CORE_SEMAPHORE_DISCIPLINES_FIFO; |
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| 96 | |
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| 97 | _CORE_semaphore_Initialize( |
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| 98 | &the_semaphore->Semaphore, |
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| 99 | OBJECTS_POSIX_SEMAPHORES, |
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| 100 | the_sem_attr, |
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| 101 | value, |
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| 102 | 0 /* XXX - proxy_extract_callout is unused */ |
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| 103 | ); |
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| 104 | |
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| 105 | /* XXX - need Names to be a string!!! */ |
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| 106 | _Objects_Open( |
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| 107 | &_POSIX_Semaphore_Information, |
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| 108 | &the_semaphore->Object, |
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| 109 | (char *) name |
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| 110 | ); |
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| 111 | |
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| 112 | *the_sem = the_semaphore; |
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| 113 | |
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| 114 | if ( pshared == PTHREAD_PROCESS_SHARED ) |
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| 115 | _POSIX_Semaphore_MP_Send_process_packet( |
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| 116 | POSIX_SEMAPHORE_MP_ANNOUNCE_CREATE, |
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| 117 | the_semaphore->Object.id, |
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| 118 | (char *) name, |
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| 119 | 0 /* proxy id - Not used */ |
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| 120 | ); |
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| 121 | |
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| 122 | _Thread_Enable_dispatch(); |
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| 123 | return 0; |
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| 124 | } |
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| 125 | |
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| 126 | |
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| 127 | /*PAGE |
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| 128 | * |
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| 129 | * 11.2.1 Initialize an Unnamed Semaphore, P1003.1b-1993, p.219 |
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| 130 | */ |
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| 131 | |
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| 132 | int sem_init( |
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| 133 | sem_t *sem, |
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| 134 | int pshared, |
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| 135 | unsigned int value |
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| 136 | ) |
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| 137 | { |
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| 138 | int status; |
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| 139 | POSIX_Semaphore_Control *the_semaphore; |
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| 140 | |
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| 141 | status = _POSIX_Semaphore_Create_support( |
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| 142 | NULL, |
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| 143 | pshared, |
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| 144 | value, |
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| 145 | &the_semaphore |
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| 146 | ); |
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| 147 | |
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| 148 | if ( status != -1 ) |
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| 149 | *sem = the_semaphore->Object.id; |
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| 150 | |
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| 151 | return status; |
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| 152 | } |
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| 153 | |
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| 154 | /*PAGE |
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| 155 | * |
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| 156 | * 11.2.2 Destroy an Unnamed Semaphore, P1003.1b-1993, p.220 |
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| 157 | */ |
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| 158 | |
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| 159 | int sem_destroy( |
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| 160 | sem_t *sem |
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| 161 | ) |
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| 162 | { |
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| 163 | register POSIX_Semaphore_Control *the_semaphore; |
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| 164 | Objects_Locations location; |
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| 165 | |
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| 166 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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| 167 | switch ( location ) { |
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| 168 | case OBJECTS_ERROR: |
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| 169 | seterrno( EINVAL ); |
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| 170 | return( -1 ); |
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| 171 | case OBJECTS_REMOTE: |
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| 172 | _Thread_Dispatch(); |
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| 173 | return POSIX_MP_NOT_IMPLEMENTED(); |
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| 174 | seterrno( EINVAL ); |
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| 175 | return( -1 ); |
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| 176 | case OBJECTS_LOCAL: |
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| 177 | /* |
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| 178 | * Undefined operation on a named semaphore. |
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| 179 | */ |
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| 180 | |
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| 181 | if ( the_semaphore->named == TRUE ) { |
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| 182 | seterrno( EINVAL ); |
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| 183 | return( -1 ); |
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| 184 | } |
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| 185 | |
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| 186 | _Objects_Close( &_POSIX_Semaphore_Information, &the_semaphore->Object ); |
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| 187 | |
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| 188 | _CORE_semaphore_Flush( |
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| 189 | &the_semaphore->Semaphore, |
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| 190 | _POSIX_Semaphore_MP_Send_object_was_deleted, |
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| 191 | -1 /* XXX should also seterrno -> EINVAL */ |
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| 192 | ); |
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| 193 | |
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| 194 | _POSIX_Semaphore_Free( the_semaphore ); |
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| 195 | |
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| 196 | if ( the_semaphore->process_shared == PTHREAD_PROCESS_SHARED ) { |
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| 197 | |
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| 198 | _Objects_MP_Close( |
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| 199 | &_POSIX_Semaphore_Information, |
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| 200 | the_semaphore->Object.id |
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| 201 | ); |
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| 202 | |
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| 203 | _POSIX_Semaphore_MP_Send_process_packet( |
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| 204 | POSIX_SEMAPHORE_MP_ANNOUNCE_DELETE, |
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| 205 | the_semaphore->Object.id, |
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| 206 | 0, /* Not used */ |
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| 207 | 0 /* Not used */ |
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| 208 | ); |
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| 209 | } |
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| 210 | _Thread_Enable_dispatch(); |
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| 211 | return 0; |
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| 212 | } |
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| 213 | return POSIX_BOTTOM_REACHED(); |
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| 214 | } |
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| 215 | |
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| 216 | /*PAGE |
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| 217 | * |
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| 218 | * 11.2.3 Initialize/Open a Named Semaphore, P1003.1b-1993, p.221 |
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| 219 | * |
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| 220 | * NOTE: When oflag is O_CREAT, then optional third and fourth |
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| 221 | * parameters must be present. |
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| 222 | */ |
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| 223 | |
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| 224 | sem_t *sem_open( |
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| 225 | const char *name, |
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| 226 | int oflag, |
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| 227 | ... |
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| 228 | /* mode_t mode, */ |
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| 229 | /* unsigned int value */ |
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| 230 | ) |
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| 231 | { |
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| 232 | va_list arg; |
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| 233 | mode_t mode; |
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| 234 | unsigned int value; |
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| 235 | int status; |
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| 236 | Objects_Id the_semaphore_id; |
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| 237 | POSIX_Semaphore_Control *the_semaphore; |
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| 238 | |
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| 239 | |
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| 240 | if ( oflag & O_CREAT ) { |
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| 241 | va_start(arg, oflag); |
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| 242 | mode = (mode_t) va_arg( arg, mode_t * ); |
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| 243 | value = (unsigned int) va_arg( arg, unsigned int * ); |
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| 244 | va_end(arg); |
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| 245 | } |
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| 246 | |
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| 247 | status = _POSIX_Semaphore_Name_to_id( name, &the_semaphore_id ); |
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| 248 | |
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| 249 | /* |
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| 250 | * If the name to id translation worked, then the semaphore exists |
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| 251 | * and we can just return a pointer to the id. Otherwise we may |
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| 252 | * need to check to see if this is a "semaphore does not exist" |
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| 253 | * or some other miscellaneous error on the name. |
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| 254 | */ |
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| 255 | |
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| 256 | if ( status ) { |
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| 257 | |
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| 258 | if ( status == EINVAL ) { /* name -> ID translation failed */ |
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| 259 | if ( !(oflag & O_CREAT) ) { /* willing to create it? */ |
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| 260 | seterrno( ENOENT ); |
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| 261 | return (sem_t *) -1; |
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| 262 | } |
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| 263 | /* we are willing to create it */ |
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| 264 | } |
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| 265 | seterrno( status ); /* some type of error */ |
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| 266 | return (sem_t *) -1; |
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| 267 | |
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| 268 | } else { /* name -> ID translation succeeded */ |
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| 269 | |
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| 270 | if ( (oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL) ) { |
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| 271 | seterrno( EEXIST ); |
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| 272 | return (sem_t *) -1; |
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| 273 | } |
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| 274 | |
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| 275 | /* |
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| 276 | * XXX In this case we need to do an ID->pointer conversion to |
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| 277 | * check the mode. This is probably a good place for a subroutine. |
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| 278 | */ |
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| 279 | |
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| 280 | the_semaphore->open_count += 1; |
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| 281 | |
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| 282 | return (sem_t *)&the_semaphore->Object.id; |
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| 283 | |
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| 284 | } |
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| 285 | |
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| 286 | /* XXX verify this comment... |
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| 287 | * |
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| 288 | * At this point, the semaphore does not exist and everything has been |
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| 289 | * checked. We should go ahead and create a semaphore. |
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| 290 | */ |
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| 291 | |
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| 292 | status = _POSIX_Semaphore_Create_support( |
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| 293 | name, |
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| 294 | TRUE, /* shared across processes */ |
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| 295 | value, |
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| 296 | &the_semaphore |
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| 297 | ); |
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| 298 | |
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| 299 | if ( status == -1 ) |
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| 300 | return (sem_t *) -1; |
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| 301 | |
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| 302 | return (sem_t *) &the_semaphore->Object.id; |
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| 303 | |
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| 304 | } |
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| 305 | |
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| 306 | /*PAGE |
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| 307 | * |
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| 308 | * _POSIX_Semaphore_Delete |
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| 309 | */ |
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| 310 | |
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| 311 | void _POSIX_Semaphore_Delete( |
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| 312 | POSIX_Semaphore_Control *the_semaphore |
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| 313 | ) |
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| 314 | { |
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| 315 | if ( !the_semaphore->linked && !the_semaphore->open_count ) { |
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| 316 | _POSIX_Semaphore_Free( the_semaphore ); |
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| 317 | |
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| 318 | if ( the_semaphore->process_shared == PTHREAD_PROCESS_SHARED ) { |
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| 319 | |
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| 320 | _Objects_MP_Close( |
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| 321 | &_POSIX_Semaphore_Information, |
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| 322 | the_semaphore->Object.id |
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| 323 | ); |
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| 324 | |
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| 325 | _POSIX_Semaphore_MP_Send_process_packet( |
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| 326 | POSIX_SEMAPHORE_MP_ANNOUNCE_DELETE, |
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| 327 | the_semaphore->Object.id, |
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| 328 | 0, /* Not used */ |
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| 329 | 0 /* Not used */ |
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| 330 | ); |
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| 331 | } |
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| 332 | |
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| 333 | } |
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| 334 | } |
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| 335 | |
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| 336 | /*PAGE |
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| 337 | * |
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| 338 | * 11.2.4 Close a Named Semaphore, P1003.1b-1993, p.224 |
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| 339 | */ |
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| 340 | |
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| 341 | int sem_close( |
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| 342 | sem_t *sem |
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| 343 | ) |
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| 344 | { |
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| 345 | register POSIX_Semaphore_Control *the_semaphore; |
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| 346 | Objects_Locations location; |
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| 347 | |
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| 348 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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| 349 | switch ( location ) { |
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| 350 | case OBJECTS_ERROR: |
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| 351 | seterrno( EINVAL ); |
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| 352 | return( -1 ); |
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| 353 | case OBJECTS_REMOTE: |
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| 354 | _Thread_Dispatch(); |
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| 355 | return POSIX_MP_NOT_IMPLEMENTED(); |
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| 356 | seterrno( EINVAL ); |
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| 357 | return( -1 ); |
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| 358 | case OBJECTS_LOCAL: |
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| 359 | the_semaphore->open_count -= 1; |
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| 360 | _POSIX_Semaphore_Delete( the_semaphore ); |
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| 361 | _Thread_Enable_dispatch(); |
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| 362 | return 0; |
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| 363 | } |
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| 364 | return POSIX_BOTTOM_REACHED(); |
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| 365 | } |
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| 366 | |
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| 367 | /*PAGE |
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| 368 | * |
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| 369 | * 11.2.5 Remove a Named Semaphore, P1003.1b-1993, p.225 |
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| 370 | */ |
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| 371 | |
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| 372 | int sem_unlink( |
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| 373 | const char *name |
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| 374 | ) |
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| 375 | { |
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| 376 | int status; |
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| 377 | register POSIX_Semaphore_Control *the_semaphore; |
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| 378 | Objects_Id the_semaphore_id; |
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| 379 | Objects_Locations location; |
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| 380 | |
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| 381 | status = _POSIX_Semaphore_Name_to_id( name, &the_semaphore_id ); |
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| 382 | |
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[05ce4e09] | 383 | if ( !status ) |
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| 384 | set_errno_and_return_minus_one( status ); |
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[5e9b32b] | 385 | |
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| 386 | the_semaphore = _POSIX_Semaphore_Get( &the_semaphore_id, &location ); |
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| 387 | switch ( location ) { |
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| 388 | case OBJECTS_ERROR: |
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| 389 | seterrno( EINVAL ); |
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| 390 | return( -1 ); |
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| 391 | case OBJECTS_REMOTE: |
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| 392 | _Thread_Dispatch(); |
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| 393 | return POSIX_MP_NOT_IMPLEMENTED(); |
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| 394 | seterrno( EINVAL ); |
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| 395 | return( -1 ); |
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| 396 | case OBJECTS_LOCAL: |
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| 397 | |
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| 398 | if ( the_semaphore->process_shared == PTHREAD_PROCESS_SHARED ) { |
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| 399 | _Objects_MP_Close( |
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| 400 | &_POSIX_Semaphore_Information, |
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| 401 | the_semaphore->Object.id |
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| 402 | ); |
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| 403 | } |
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| 404 | |
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| 405 | the_semaphore->linked = FALSE; |
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| 406 | |
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| 407 | _POSIX_Semaphore_Delete( the_semaphore ); |
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| 408 | |
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| 409 | _Thread_Enable_dispatch(); |
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| 410 | return 0; |
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| 411 | } |
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| 412 | return POSIX_BOTTOM_REACHED(); |
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| 413 | } |
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| 414 | |
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| 415 | /*PAGE |
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| 416 | * |
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| 417 | * _POSIX_Semaphore_Wait_support |
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| 418 | */ |
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| 419 | |
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| 420 | int _POSIX_Semaphore_Wait_support( |
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| 421 | sem_t *sem, |
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| 422 | boolean blocking, |
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| 423 | Watchdog_Interval timeout |
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| 424 | ) |
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| 425 | { |
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| 426 | register POSIX_Semaphore_Control *the_semaphore; |
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| 427 | Objects_Locations location; |
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| 428 | |
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| 429 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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| 430 | switch ( location ) { |
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| 431 | case OBJECTS_ERROR: |
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| 432 | seterrno( EINVAL ); |
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| 433 | return( -1 ); |
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| 434 | case OBJECTS_REMOTE: |
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| 435 | _Thread_Dispatch(); |
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| 436 | return POSIX_MP_NOT_IMPLEMENTED(); |
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| 437 | seterrno( EINVAL ); |
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| 438 | return( -1 ); |
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| 439 | case OBJECTS_LOCAL: |
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| 440 | _CORE_semaphore_Seize( |
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| 441 | &the_semaphore->Semaphore, |
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| 442 | the_semaphore->Object.id, |
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| 443 | blocking, |
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| 444 | timeout |
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| 445 | ); |
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| 446 | _Thread_Enable_dispatch(); |
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| 447 | return _Thread_Executing->Wait.return_code; |
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| 448 | } |
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| 449 | return POSIX_BOTTOM_REACHED(); |
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| 450 | } |
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| 451 | |
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| 452 | /*PAGE |
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| 453 | * |
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| 454 | * 11.2.6 Lock a Semaphore, P1003.1b-1993, p.226 |
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| 455 | * |
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| 456 | * NOTE: P1003.4b/D8 adds sem_timedwait(), p. 27 |
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| 457 | */ |
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| 458 | |
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| 459 | int sem_wait( |
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| 460 | sem_t *sem |
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| 461 | ) |
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| 462 | { |
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| 463 | return _POSIX_Semaphore_Wait_support( sem, TRUE, THREAD_QUEUE_WAIT_FOREVER ); |
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| 464 | } |
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| 465 | |
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| 466 | /*PAGE |
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| 467 | * |
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| 468 | * 11.2.6 Lock a Semaphore, P1003.1b-1993, p.226 |
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| 469 | * |
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| 470 | * NOTE: P1003.4b/D8 adds sem_timedwait(), p. 27 |
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| 471 | */ |
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| 472 | |
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| 473 | int sem_trywait( |
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| 474 | sem_t *sem |
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| 475 | ) |
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| 476 | { |
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| 477 | return _POSIX_Semaphore_Wait_support( sem, FALSE, THREAD_QUEUE_WAIT_FOREVER ); |
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| 478 | } |
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| 479 | |
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| 480 | /*PAGE |
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| 481 | * |
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| 482 | * 11.2.6 Lock a Semaphore, P1003.1b-1993, p.226 |
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| 483 | * |
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| 484 | * NOTE: P1003.4b/D8 adds sem_timedwait(), p. 27 |
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| 485 | */ |
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| 486 | |
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| 487 | int sem_timedwait( |
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| 488 | sem_t *sem, |
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| 489 | const struct timespec *timeout |
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| 490 | ) |
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| 491 | { |
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| 492 | return _POSIX_Semaphore_Wait_support( |
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| 493 | sem, |
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| 494 | TRUE, |
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[5b748a1] | 495 | _POSIX_Timespec_to_interval( timeout ) |
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[5e9b32b] | 496 | ); |
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| 497 | } |
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| 498 | |
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| 499 | /*PAGE |
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| 500 | * |
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| 501 | * 11.2.7 Unlock a Semaphore, P1003.1b-1993, p.227 |
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| 502 | */ |
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| 503 | |
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| 504 | void POSIX_Semaphore_MP_support( |
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| 505 | Thread_Control *the_thread, |
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| 506 | Objects_Id id |
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| 507 | ) |
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| 508 | { |
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| 509 | (void) POSIX_MP_NOT_IMPLEMENTED(); |
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| 510 | } |
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| 511 | |
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| 512 | |
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| 513 | int sem_post( |
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| 514 | sem_t *sem |
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| 515 | ) |
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| 516 | { |
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| 517 | register POSIX_Semaphore_Control *the_semaphore; |
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| 518 | Objects_Locations location; |
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| 519 | |
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| 520 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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| 521 | switch ( location ) { |
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| 522 | case OBJECTS_ERROR: |
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| 523 | seterrno( EINVAL ); |
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| 524 | return( -1 ); |
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| 525 | case OBJECTS_REMOTE: |
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| 526 | _Thread_Dispatch(); |
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| 527 | return POSIX_MP_NOT_IMPLEMENTED(); |
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| 528 | seterrno( EINVAL ); |
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| 529 | return( -1 ); |
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| 530 | case OBJECTS_LOCAL: |
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| 531 | _CORE_semaphore_Surrender( |
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| 532 | &the_semaphore->Semaphore, |
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| 533 | the_semaphore->Object.id, |
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| 534 | POSIX_Semaphore_MP_support |
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| 535 | ); |
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| 536 | _Thread_Enable_dispatch(); |
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| 537 | return 0; |
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| 538 | } |
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| 539 | return POSIX_BOTTOM_REACHED(); |
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| 540 | } |
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| 541 | |
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| 542 | /*PAGE |
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| 543 | * |
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| 544 | * 11.2.8 Get the Value of a Semaphore, P1003.1b-1993, p.229 |
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| 545 | */ |
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| 546 | |
---|
| 547 | int sem_getvalue( |
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| 548 | sem_t *sem, |
---|
| 549 | int *sval |
---|
| 550 | ) |
---|
| 551 | { |
---|
| 552 | register POSIX_Semaphore_Control *the_semaphore; |
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| 553 | Objects_Locations location; |
---|
| 554 | |
---|
| 555 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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| 556 | switch ( location ) { |
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| 557 | case OBJECTS_ERROR: |
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| 558 | seterrno( EINVAL ); |
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| 559 | return( -1 ); |
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| 560 | case OBJECTS_REMOTE: |
---|
| 561 | _Thread_Dispatch(); |
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| 562 | return POSIX_MP_NOT_IMPLEMENTED(); |
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| 563 | seterrno( EINVAL ); |
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| 564 | return( -1 ); |
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| 565 | case OBJECTS_LOCAL: |
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| 566 | *sval = _CORE_semaphore_Get_count( &the_semaphore->Semaphore ); |
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| 567 | _Thread_Enable_dispatch(); |
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| 568 | return 0; |
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| 569 | } |
---|
| 570 | return POSIX_BOTTOM_REACHED(); |
---|
| 571 | } |
---|