[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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[93994fdb] | 17 | #include <rtems/posix/seterr.h> |
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[5e9b32b] | 18 | |
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| 19 | /*PAGE |
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| 20 | * |
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| 21 | * _POSIX_Semaphore_Manager_initialization |
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| 22 | * |
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| 23 | * This routine initializes all semaphore manager related data structures. |
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| 24 | * |
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| 25 | * Input parameters: |
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| 26 | * maximum_semaphores - maximum configured semaphores |
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| 27 | * |
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| 28 | * Output parameters: NONE |
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| 29 | */ |
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| 30 | |
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| 31 | void _POSIX_Semaphore_Manager_initialization( |
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| 32 | unsigned32 maximum_semaphores |
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| 33 | ) |
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| 34 | { |
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| 35 | _Objects_Initialize_information( |
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| 36 | &_POSIX_Semaphore_Information, |
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| 37 | OBJECTS_POSIX_SEMAPHORES, |
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| 38 | TRUE, |
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| 39 | maximum_semaphores, |
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| 40 | sizeof( POSIX_Semaphore_Control ), |
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| 41 | TRUE, |
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| 42 | _POSIX_PATH_MAX, |
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| 43 | FALSE |
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| 44 | ); |
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| 45 | } |
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| 46 | |
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| 47 | /*PAGE |
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| 48 | * |
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| 49 | * _POSIX_Semaphore_Create_support |
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| 50 | */ |
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| 51 | |
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| 52 | int _POSIX_Semaphore_Create_support( |
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| 53 | const char *name, |
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| 54 | int pshared, |
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| 55 | unsigned int value, |
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| 56 | POSIX_Semaphore_Control **the_sem |
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| 57 | ) |
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| 58 | { |
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| 59 | POSIX_Semaphore_Control *the_semaphore; |
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| 60 | CORE_semaphore_Attributes *the_sem_attr; |
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| 61 | |
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| 62 | _Thread_Disable_dispatch(); |
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| 63 | |
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[fd882ee] | 64 | /* Sharing semaphores among processes is not currently supported */ |
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| 65 | if (pshared != 0) { |
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| 66 | _Thread_Enable_dispatch(); |
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| 67 | set_errno_and_return_minus_one( ENOSYS ); |
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| 68 | } |
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| 69 | |
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[5e9b32b] | 70 | the_semaphore = _POSIX_Semaphore_Allocate(); |
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| 71 | |
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| 72 | if ( !the_semaphore ) { |
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| 73 | _Thread_Enable_dispatch(); |
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[fd882ee] | 74 | set_errno_and_return_minus_one( ENOSPC ); |
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[5e9b32b] | 75 | } |
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| 76 | |
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[93994fdb] | 77 | #if defined(RTEMS_MULTIPROCESSING) |
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[5e9b32b] | 78 | if ( pshared == PTHREAD_PROCESS_SHARED && |
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| 79 | !( _Objects_MP_Allocate_and_open( &_POSIX_Semaphore_Information, 0, |
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| 80 | the_semaphore->Object.id, FALSE ) ) ) { |
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| 81 | _POSIX_Semaphore_Free( the_semaphore ); |
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| 82 | _Thread_Enable_dispatch(); |
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[05ce4e09] | 83 | set_errno_and_return_minus_one( EAGAIN ); |
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[5e9b32b] | 84 | } |
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[93994fdb] | 85 | #endif |
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[5e9b32b] | 86 | |
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| 87 | the_semaphore->process_shared = pshared; |
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| 88 | |
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| 89 | if ( name ) { |
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| 90 | the_semaphore->named = TRUE; |
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| 91 | the_semaphore->open_count = 1; |
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| 92 | the_semaphore->linked = TRUE; |
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| 93 | } |
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| 94 | else |
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| 95 | the_semaphore->named = FALSE; |
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| 96 | |
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| 97 | the_sem_attr = &the_semaphore->Semaphore.Attributes; |
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| 98 | |
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| 99 | /* XXX |
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| 100 | * |
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| 101 | * Note should this be based on the current scheduling policy? |
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| 102 | */ |
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| 103 | |
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| 104 | the_sem_attr->discipline = CORE_SEMAPHORE_DISCIPLINES_FIFO; |
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[fd882ee] | 105 | |
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| 106 | /* |
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| 107 | * This effectively disables limit checking. |
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| 108 | */ |
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| 109 | |
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| 110 | the_sem_attr->maximum_count = 0xFFFFFFFF; |
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| 111 | |
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[5e9b32b] | 112 | _CORE_semaphore_Initialize( |
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| 113 | &the_semaphore->Semaphore, |
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| 114 | OBJECTS_POSIX_SEMAPHORES, |
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| 115 | the_sem_attr, |
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| 116 | value, |
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| 117 | 0 /* XXX - proxy_extract_callout is unused */ |
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| 118 | ); |
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| 119 | |
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| 120 | /* XXX - need Names to be a string!!! */ |
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| 121 | _Objects_Open( |
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| 122 | &_POSIX_Semaphore_Information, |
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| 123 | &the_semaphore->Object, |
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| 124 | (char *) name |
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| 125 | ); |
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| 126 | |
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| 127 | *the_sem = the_semaphore; |
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| 128 | |
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[93994fdb] | 129 | #if defined(RTEMS_MULTIPROCESSING) |
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[5e9b32b] | 130 | if ( pshared == PTHREAD_PROCESS_SHARED ) |
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| 131 | _POSIX_Semaphore_MP_Send_process_packet( |
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| 132 | POSIX_SEMAPHORE_MP_ANNOUNCE_CREATE, |
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| 133 | the_semaphore->Object.id, |
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| 134 | (char *) name, |
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| 135 | 0 /* proxy id - Not used */ |
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| 136 | ); |
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[93994fdb] | 137 | #endif |
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[5e9b32b] | 138 | |
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| 139 | _Thread_Enable_dispatch(); |
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| 140 | return 0; |
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| 141 | } |
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| 142 | |
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| 143 | |
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| 144 | /*PAGE |
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| 145 | * |
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| 146 | * 11.2.1 Initialize an Unnamed Semaphore, P1003.1b-1993, p.219 |
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| 147 | */ |
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| 148 | |
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| 149 | int sem_init( |
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| 150 | sem_t *sem, |
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| 151 | int pshared, |
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| 152 | unsigned int value |
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| 153 | ) |
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| 154 | { |
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| 155 | int status; |
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| 156 | POSIX_Semaphore_Control *the_semaphore; |
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| 157 | |
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| 158 | status = _POSIX_Semaphore_Create_support( |
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| 159 | NULL, |
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| 160 | pshared, |
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| 161 | value, |
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| 162 | &the_semaphore |
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| 163 | ); |
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| 164 | |
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| 165 | if ( status != -1 ) |
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| 166 | *sem = the_semaphore->Object.id; |
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| 167 | |
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| 168 | return status; |
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| 169 | } |
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| 170 | |
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| 171 | /*PAGE |
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| 172 | * |
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| 173 | * 11.2.2 Destroy an Unnamed Semaphore, P1003.1b-1993, p.220 |
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| 174 | */ |
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| 175 | |
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| 176 | int sem_destroy( |
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| 177 | sem_t *sem |
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| 178 | ) |
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| 179 | { |
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| 180 | register POSIX_Semaphore_Control *the_semaphore; |
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| 181 | Objects_Locations location; |
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| 182 | |
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| 183 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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| 184 | switch ( location ) { |
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| 185 | case OBJECTS_ERROR: |
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[93994fdb] | 186 | set_errno_and_return_minus_one( EINVAL ); |
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[5e9b32b] | 187 | case OBJECTS_REMOTE: |
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| 188 | _Thread_Dispatch(); |
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| 189 | return POSIX_MP_NOT_IMPLEMENTED(); |
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[93994fdb] | 190 | set_errno_and_return_minus_one( EINVAL ); |
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[5e9b32b] | 191 | case OBJECTS_LOCAL: |
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| 192 | /* |
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| 193 | * Undefined operation on a named semaphore. |
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| 194 | */ |
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| 195 | |
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| 196 | if ( the_semaphore->named == TRUE ) { |
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[93994fdb] | 197 | set_errno_and_return_minus_one( EINVAL ); |
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[5e9b32b] | 198 | } |
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| 199 | |
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| 200 | _Objects_Close( &_POSIX_Semaphore_Information, &the_semaphore->Object ); |
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| 201 | |
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| 202 | _CORE_semaphore_Flush( |
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| 203 | &the_semaphore->Semaphore, |
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[93994fdb] | 204 | #if defined(RTEMS_MULTIPROCESSING) |
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[5e9b32b] | 205 | _POSIX_Semaphore_MP_Send_object_was_deleted, |
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[93994fdb] | 206 | #else |
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| 207 | NULL, |
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| 208 | #endif |
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[5e9b32b] | 209 | -1 /* XXX should also seterrno -> EINVAL */ |
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| 210 | ); |
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| 211 | |
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| 212 | _POSIX_Semaphore_Free( the_semaphore ); |
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| 213 | |
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[93994fdb] | 214 | #if defined(RTEMS_MULTIPROCESSING) |
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[5e9b32b] | 215 | if ( the_semaphore->process_shared == PTHREAD_PROCESS_SHARED ) { |
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| 216 | |
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| 217 | _Objects_MP_Close( |
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| 218 | &_POSIX_Semaphore_Information, |
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| 219 | the_semaphore->Object.id |
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| 220 | ); |
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| 221 | |
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| 222 | _POSIX_Semaphore_MP_Send_process_packet( |
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| 223 | POSIX_SEMAPHORE_MP_ANNOUNCE_DELETE, |
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| 224 | the_semaphore->Object.id, |
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| 225 | 0, /* Not used */ |
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| 226 | 0 /* Not used */ |
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| 227 | ); |
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| 228 | } |
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[93994fdb] | 229 | #endif |
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[5e9b32b] | 230 | _Thread_Enable_dispatch(); |
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| 231 | return 0; |
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| 232 | } |
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| 233 | return POSIX_BOTTOM_REACHED(); |
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| 234 | } |
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| 235 | |
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| 236 | /*PAGE |
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| 237 | * |
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| 238 | * 11.2.3 Initialize/Open a Named Semaphore, P1003.1b-1993, p.221 |
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| 239 | * |
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| 240 | * NOTE: When oflag is O_CREAT, then optional third and fourth |
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| 241 | * parameters must be present. |
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| 242 | */ |
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| 243 | |
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| 244 | sem_t *sem_open( |
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| 245 | const char *name, |
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| 246 | int oflag, |
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| 247 | ... |
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| 248 | /* mode_t mode, */ |
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| 249 | /* unsigned int value */ |
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| 250 | ) |
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| 251 | { |
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| 252 | va_list arg; |
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| 253 | mode_t mode; |
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| 254 | unsigned int value; |
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| 255 | int status; |
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| 256 | Objects_Id the_semaphore_id; |
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| 257 | POSIX_Semaphore_Control *the_semaphore; |
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[fd882ee] | 258 | Objects_Locations location; |
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[5e9b32b] | 259 | |
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| 260 | |
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| 261 | if ( oflag & O_CREAT ) { |
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| 262 | va_start(arg, oflag); |
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[fd882ee] | 263 | /*mode = (mode_t) va_arg( arg, mode_t * );*/ |
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| 264 | mode = va_arg( arg, mode_t ); |
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| 265 | /*value = (unsigned int) va_arg( arg, unsigned int * );*/ |
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| 266 | value = va_arg( arg, unsigned int ); |
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[5e9b32b] | 267 | va_end(arg); |
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| 268 | } |
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| 269 | |
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| 270 | status = _POSIX_Semaphore_Name_to_id( name, &the_semaphore_id ); |
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| 271 | |
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| 272 | /* |
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| 273 | * If the name to id translation worked, then the semaphore exists |
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| 274 | * and we can just return a pointer to the id. Otherwise we may |
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| 275 | * need to check to see if this is a "semaphore does not exist" |
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| 276 | * or some other miscellaneous error on the name. |
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| 277 | */ |
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| 278 | |
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| 279 | if ( status ) { |
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| 280 | |
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| 281 | if ( status == EINVAL ) { /* name -> ID translation failed */ |
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| 282 | if ( !(oflag & O_CREAT) ) { /* willing to create it? */ |
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[93994fdb] | 283 | set_errno_and_return_minus_one_cast( ENOENT, sem_t * ); |
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[5e9b32b] | 284 | } |
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| 285 | /* we are willing to create it */ |
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| 286 | } |
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[93994fdb] | 287 | /* some type of error */ |
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[fd882ee] | 288 | /*set_errno_and_return_minus_one_cast( status, sem_t * );*/ |
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[5e9b32b] | 289 | |
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| 290 | } else { /* name -> ID translation succeeded */ |
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| 291 | |
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| 292 | if ( (oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL) ) { |
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[93994fdb] | 293 | set_errno_and_return_minus_one_cast( EEXIST, sem_t * ); |
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[5e9b32b] | 294 | } |
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| 295 | |
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| 296 | /* |
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| 297 | * XXX In this case we need to do an ID->pointer conversion to |
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| 298 | * check the mode. This is probably a good place for a subroutine. |
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| 299 | */ |
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| 300 | |
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[fd882ee] | 301 | the_semaphore = _POSIX_Semaphore_Get( &the_semaphore_id, &location ); |
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[5e9b32b] | 302 | the_semaphore->open_count += 1; |
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| 303 | |
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| 304 | return (sem_t *)&the_semaphore->Object.id; |
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| 305 | |
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| 306 | } |
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| 307 | |
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| 308 | /* XXX verify this comment... |
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| 309 | * |
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| 310 | * At this point, the semaphore does not exist and everything has been |
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| 311 | * checked. We should go ahead and create a semaphore. |
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| 312 | */ |
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| 313 | |
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| 314 | status = _POSIX_Semaphore_Create_support( |
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| 315 | name, |
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[fd882ee] | 316 | FALSE, /* not shared across processes */ |
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[5e9b32b] | 317 | value, |
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| 318 | &the_semaphore |
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| 319 | ); |
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| 320 | |
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| 321 | if ( status == -1 ) |
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| 322 | return (sem_t *) -1; |
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| 323 | |
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| 324 | return (sem_t *) &the_semaphore->Object.id; |
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| 325 | |
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| 326 | } |
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| 327 | |
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| 328 | /*PAGE |
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| 329 | * |
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| 330 | * _POSIX_Semaphore_Delete |
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| 331 | */ |
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| 332 | |
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| 333 | void _POSIX_Semaphore_Delete( |
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| 334 | POSIX_Semaphore_Control *the_semaphore |
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| 335 | ) |
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| 336 | { |
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| 337 | if ( !the_semaphore->linked && !the_semaphore->open_count ) { |
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| 338 | _POSIX_Semaphore_Free( the_semaphore ); |
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| 339 | |
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[93994fdb] | 340 | #if defined(RTEMS_MULTIPROCESSING) |
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[5e9b32b] | 341 | if ( the_semaphore->process_shared == PTHREAD_PROCESS_SHARED ) { |
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| 342 | |
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| 343 | _Objects_MP_Close( |
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| 344 | &_POSIX_Semaphore_Information, |
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| 345 | the_semaphore->Object.id |
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| 346 | ); |
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| 347 | |
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| 348 | _POSIX_Semaphore_MP_Send_process_packet( |
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| 349 | POSIX_SEMAPHORE_MP_ANNOUNCE_DELETE, |
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| 350 | the_semaphore->Object.id, |
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| 351 | 0, /* Not used */ |
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| 352 | 0 /* Not used */ |
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| 353 | ); |
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| 354 | } |
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[93994fdb] | 355 | #endif |
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[5e9b32b] | 356 | |
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| 357 | } |
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| 358 | } |
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| 359 | |
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| 360 | /*PAGE |
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| 361 | * |
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| 362 | * 11.2.4 Close a Named Semaphore, P1003.1b-1993, p.224 |
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| 363 | */ |
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| 364 | |
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| 365 | int sem_close( |
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| 366 | sem_t *sem |
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| 367 | ) |
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| 368 | { |
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| 369 | register POSIX_Semaphore_Control *the_semaphore; |
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| 370 | Objects_Locations location; |
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| 371 | |
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| 372 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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| 373 | switch ( location ) { |
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| 374 | case OBJECTS_ERROR: |
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[93994fdb] | 375 | set_errno_and_return_minus_one( EINVAL ); |
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[5e9b32b] | 376 | case OBJECTS_REMOTE: |
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| 377 | _Thread_Dispatch(); |
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| 378 | return POSIX_MP_NOT_IMPLEMENTED(); |
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[93994fdb] | 379 | set_errno_and_return_minus_one( EINVAL ); |
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[5e9b32b] | 380 | case OBJECTS_LOCAL: |
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| 381 | the_semaphore->open_count -= 1; |
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| 382 | _POSIX_Semaphore_Delete( the_semaphore ); |
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| 383 | _Thread_Enable_dispatch(); |
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| 384 | return 0; |
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| 385 | } |
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| 386 | return POSIX_BOTTOM_REACHED(); |
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| 387 | } |
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| 388 | |
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| 389 | /*PAGE |
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| 390 | * |
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| 391 | * 11.2.5 Remove a Named Semaphore, P1003.1b-1993, p.225 |
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| 392 | */ |
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| 393 | |
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| 394 | int sem_unlink( |
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| 395 | const char *name |
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| 396 | ) |
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| 397 | { |
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| 398 | int status; |
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| 399 | register POSIX_Semaphore_Control *the_semaphore; |
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| 400 | Objects_Id the_semaphore_id; |
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| 401 | Objects_Locations location; |
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| 402 | |
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| 403 | status = _POSIX_Semaphore_Name_to_id( name, &the_semaphore_id ); |
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| 404 | |
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[05ce4e09] | 405 | if ( !status ) |
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| 406 | set_errno_and_return_minus_one( status ); |
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[5e9b32b] | 407 | |
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| 408 | the_semaphore = _POSIX_Semaphore_Get( &the_semaphore_id, &location ); |
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| 409 | switch ( location ) { |
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| 410 | case OBJECTS_ERROR: |
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[93994fdb] | 411 | set_errno_and_return_minus_one( EINVAL ); |
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[5e9b32b] | 412 | case OBJECTS_REMOTE: |
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| 413 | _Thread_Dispatch(); |
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| 414 | return POSIX_MP_NOT_IMPLEMENTED(); |
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[93994fdb] | 415 | set_errno_and_return_minus_one( EINVAL ); |
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[5e9b32b] | 416 | case OBJECTS_LOCAL: |
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| 417 | |
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[93994fdb] | 418 | #if defined(RTEMS_MULTIPROCESSING) |
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[5e9b32b] | 419 | if ( the_semaphore->process_shared == PTHREAD_PROCESS_SHARED ) { |
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| 420 | _Objects_MP_Close( |
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| 421 | &_POSIX_Semaphore_Information, |
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| 422 | the_semaphore->Object.id |
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| 423 | ); |
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| 424 | } |
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[93994fdb] | 425 | #endif |
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[5e9b32b] | 426 | |
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| 427 | the_semaphore->linked = FALSE; |
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| 428 | |
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| 429 | _POSIX_Semaphore_Delete( the_semaphore ); |
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| 430 | |
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| 431 | _Thread_Enable_dispatch(); |
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| 432 | return 0; |
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| 433 | } |
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| 434 | return POSIX_BOTTOM_REACHED(); |
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| 435 | } |
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| 436 | |
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| 437 | /*PAGE |
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| 438 | * |
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| 439 | * _POSIX_Semaphore_Wait_support |
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| 440 | */ |
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| 441 | |
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| 442 | int _POSIX_Semaphore_Wait_support( |
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| 443 | sem_t *sem, |
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| 444 | boolean blocking, |
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| 445 | Watchdog_Interval timeout |
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| 446 | ) |
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| 447 | { |
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| 448 | register POSIX_Semaphore_Control *the_semaphore; |
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| 449 | Objects_Locations location; |
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[fd882ee] | 450 | int code; |
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[5e9b32b] | 451 | |
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| 452 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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| 453 | switch ( location ) { |
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| 454 | case OBJECTS_ERROR: |
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[93994fdb] | 455 | set_errno_and_return_minus_one( EINVAL ); |
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[5e9b32b] | 456 | case OBJECTS_REMOTE: |
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| 457 | _Thread_Dispatch(); |
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| 458 | return POSIX_MP_NOT_IMPLEMENTED(); |
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[93994fdb] | 459 | set_errno_and_return_minus_one( EINVAL ); |
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[5e9b32b] | 460 | case OBJECTS_LOCAL: |
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| 461 | _CORE_semaphore_Seize( |
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| 462 | &the_semaphore->Semaphore, |
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| 463 | the_semaphore->Object.id, |
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| 464 | blocking, |
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| 465 | timeout |
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| 466 | ); |
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| 467 | _Thread_Enable_dispatch(); |
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[fd882ee] | 468 | code = _Thread_Executing->Wait.return_code; |
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| 469 | switch (_Thread_Executing->Wait.return_code) { |
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| 470 | case 1: |
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| 471 | errno = EAGAIN; |
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| 472 | code = -1; |
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| 473 | break; |
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| 474 | case 3: |
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| 475 | errno = ETIMEDOUT; |
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| 476 | code = -1; |
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| 477 | break; |
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| 478 | } |
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| 479 | |
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| 480 | /*return _Thread_Executing->Wait.return_code;*/ |
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| 481 | return code; |
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[5e9b32b] | 482 | } |
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| 483 | return POSIX_BOTTOM_REACHED(); |
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| 484 | } |
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| 485 | |
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| 486 | /*PAGE |
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| 487 | * |
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| 488 | * 11.2.6 Lock a Semaphore, P1003.1b-1993, p.226 |
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| 489 | * |
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| 490 | * NOTE: P1003.4b/D8 adds sem_timedwait(), p. 27 |
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| 491 | */ |
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| 492 | |
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| 493 | int sem_wait( |
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| 494 | sem_t *sem |
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| 495 | ) |
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| 496 | { |
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| 497 | return _POSIX_Semaphore_Wait_support( sem, TRUE, THREAD_QUEUE_WAIT_FOREVER ); |
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| 498 | } |
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| 499 | |
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| 500 | /*PAGE |
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| 501 | * |
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| 502 | * 11.2.6 Lock a Semaphore, P1003.1b-1993, p.226 |
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| 503 | * |
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| 504 | * NOTE: P1003.4b/D8 adds sem_timedwait(), p. 27 |
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| 505 | */ |
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| 506 | |
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| 507 | int sem_trywait( |
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| 508 | sem_t *sem |
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| 509 | ) |
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| 510 | { |
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| 511 | return _POSIX_Semaphore_Wait_support( sem, FALSE, THREAD_QUEUE_WAIT_FOREVER ); |
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| 512 | } |
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| 513 | |
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| 514 | /*PAGE |
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| 515 | * |
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| 516 | * 11.2.6 Lock a Semaphore, P1003.1b-1993, p.226 |
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| 517 | * |
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| 518 | * NOTE: P1003.4b/D8 adds sem_timedwait(), p. 27 |
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| 519 | */ |
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| 520 | |
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| 521 | int sem_timedwait( |
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| 522 | sem_t *sem, |
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| 523 | const struct timespec *timeout |
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| 524 | ) |
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| 525 | { |
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| 526 | return _POSIX_Semaphore_Wait_support( |
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| 527 | sem, |
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| 528 | TRUE, |
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[5b748a1] | 529 | _POSIX_Timespec_to_interval( timeout ) |
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[5e9b32b] | 530 | ); |
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| 531 | } |
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| 532 | |
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| 533 | /*PAGE |
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| 534 | * |
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| 535 | * 11.2.7 Unlock a Semaphore, P1003.1b-1993, p.227 |
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| 536 | */ |
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| 537 | |
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| 538 | void POSIX_Semaphore_MP_support( |
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| 539 | Thread_Control *the_thread, |
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| 540 | Objects_Id id |
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| 541 | ) |
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| 542 | { |
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| 543 | (void) POSIX_MP_NOT_IMPLEMENTED(); |
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| 544 | } |
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| 545 | |
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| 546 | |
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| 547 | int sem_post( |
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| 548 | sem_t *sem |
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| 549 | ) |
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| 550 | { |
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| 551 | register POSIX_Semaphore_Control *the_semaphore; |
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| 552 | Objects_Locations location; |
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| 553 | |
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| 554 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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| 555 | switch ( location ) { |
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| 556 | case OBJECTS_ERROR: |
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[93994fdb] | 557 | set_errno_and_return_minus_one( EINVAL ); |
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[5e9b32b] | 558 | case OBJECTS_REMOTE: |
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| 559 | _Thread_Dispatch(); |
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| 560 | return POSIX_MP_NOT_IMPLEMENTED(); |
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[93994fdb] | 561 | set_errno_and_return_minus_one( EINVAL ); |
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[5e9b32b] | 562 | case OBJECTS_LOCAL: |
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| 563 | _CORE_semaphore_Surrender( |
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| 564 | &the_semaphore->Semaphore, |
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| 565 | the_semaphore->Object.id, |
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[93994fdb] | 566 | #if defined(RTEMS_MULTIPROCESSING) |
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[5e9b32b] | 567 | POSIX_Semaphore_MP_support |
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[93994fdb] | 568 | #else |
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| 569 | NULL |
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| 570 | #endif |
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[5e9b32b] | 571 | ); |
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| 572 | _Thread_Enable_dispatch(); |
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| 573 | return 0; |
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| 574 | } |
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| 575 | return POSIX_BOTTOM_REACHED(); |
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| 576 | } |
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| 577 | |
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| 578 | /*PAGE |
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| 579 | * |
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| 580 | * 11.2.8 Get the Value of a Semaphore, P1003.1b-1993, p.229 |
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| 581 | */ |
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| 582 | |
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| 583 | int sem_getvalue( |
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| 584 | sem_t *sem, |
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| 585 | int *sval |
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| 586 | ) |
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| 587 | { |
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| 588 | register POSIX_Semaphore_Control *the_semaphore; |
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| 589 | Objects_Locations location; |
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| 590 | |
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| 591 | the_semaphore = _POSIX_Semaphore_Get( sem, &location ); |
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| 592 | switch ( location ) { |
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| 593 | case OBJECTS_ERROR: |
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[93994fdb] | 594 | set_errno_and_return_minus_one( EINVAL ); |
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[5e9b32b] | 595 | case OBJECTS_REMOTE: |
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| 596 | _Thread_Dispatch(); |
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| 597 | return POSIX_MP_NOT_IMPLEMENTED(); |
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[93994fdb] | 598 | set_errno_and_return_minus_one( EINVAL ); |
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[5e9b32b] | 599 | case OBJECTS_LOCAL: |
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| 600 | *sval = _CORE_semaphore_Get_count( &the_semaphore->Semaphore ); |
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| 601 | _Thread_Enable_dispatch(); |
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| 602 | return 0; |
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| 603 | } |
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| 604 | return POSIX_BOTTOM_REACHED(); |
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| 605 | } |
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[fd882ee] | 606 | |
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| 607 | /*PAGE |
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| 608 | * |
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| 609 | * _POSIX_Semaphore_Name_to_id |
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| 610 | * |
---|
| 611 | * XXX |
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| 612 | */ |
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| 613 | |
---|
| 614 | int _POSIX_Semaphore_Name_to_id( |
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| 615 | const char *name, |
---|
| 616 | Objects_Id *id |
---|
| 617 | ) |
---|
| 618 | { |
---|
| 619 | Objects_Name_to_id_errors status; |
---|
| 620 | |
---|
| 621 | status = _Objects_Name_to_id( &_POSIX_Semaphore_Information, name, 0, id ); |
---|
| 622 | |
---|
| 623 | if ( status == OBJECTS_SUCCESSFUL ) { |
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| 624 | return 0; |
---|
| 625 | } else { |
---|
| 626 | return EINVAL; |
---|
| 627 | } |
---|
| 628 | } |
---|
| 629 | |
---|