[c06d8f64] | 1 | /* |
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| 2 | * Semaphore Manager |
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| 3 | * |
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| 4 | * DESCRIPTION: |
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| 5 | * |
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| 6 | * This package is the implementation of the Semaphore Manager. |
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| 7 | * This manager utilizes standard Dijkstra counting semaphores to provide |
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| 8 | * synchronization and mutual exclusion capabilities. |
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| 9 | * |
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| 10 | * Directives provided are: |
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| 11 | * |
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| 12 | * + create a semaphore |
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| 13 | * + get an ID of a semaphore |
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| 14 | * + delete a semaphore |
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| 15 | * + acquire a semaphore |
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| 16 | * + release a semaphore |
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| 17 | * |
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[08311cc3] | 18 | * COPYRIGHT (c) 1989-1999. |
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[c06d8f64] | 19 | * On-Line Applications Research Corporation (OAR). |
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| 20 | * |
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| 21 | * The license and distribution terms for this file may be |
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| 22 | * found in the file LICENSE in this distribution or at |
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| 23 | * http://www.OARcorp.com/rtems/license.html. |
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| 24 | * |
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| 25 | * $Id$ |
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| 26 | */ |
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| 27 | |
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| 28 | #include <rtems/system.h> |
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| 29 | #include <rtems/rtems/status.h> |
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| 30 | #include <rtems/rtems/support.h> |
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| 31 | #include <rtems/rtems/attr.h> |
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| 32 | #include <rtems/score/isr.h> |
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| 33 | #include <rtems/score/object.h> |
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| 34 | #include <rtems/rtems/options.h> |
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| 35 | #include <rtems/rtems/sem.h> |
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| 36 | #include <rtems/score/coremutex.h> |
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| 37 | #include <rtems/score/coresem.h> |
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| 38 | #include <rtems/score/states.h> |
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| 39 | #include <rtems/score/thread.h> |
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| 40 | #include <rtems/score/threadq.h> |
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| 41 | #if defined(RTEMS_MULTIPROCESSING) |
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| 42 | #include <rtems/score/mpci.h> |
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| 43 | #endif |
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| 44 | #include <rtems/score/sysstate.h> |
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| 45 | |
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| 46 | #include <rtems/score/interr.h> |
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| 47 | |
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| 48 | /*PAGE |
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| 49 | * |
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| 50 | * rtems_semaphore_release |
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| 51 | * |
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| 52 | * This directive allows a thread to release a semaphore. |
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| 53 | * |
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| 54 | * Input parameters: |
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| 55 | * id - semaphore id |
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| 56 | * |
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| 57 | * Output parameters: |
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| 58 | * RTEMS_SUCCESSFUL - if successful |
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| 59 | * error code - if unsuccessful |
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| 60 | */ |
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| 61 | |
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[ab654be] | 62 | #if defined(RTEMS_MULTIPROCESSING) |
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| 63 | #define MUTEX_MP_SUPPORT _Semaphore_Core_mutex_mp_support |
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| 64 | #else |
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| 65 | #define MUTEX_MP_SUPPORT NULL |
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| 66 | #endif |
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| 67 | |
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[c06d8f64] | 68 | rtems_status_code rtems_semaphore_release( |
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| 69 | Objects_Id id |
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| 70 | ) |
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| 71 | { |
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| 72 | register Semaphore_Control *the_semaphore; |
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| 73 | Objects_Locations location; |
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| 74 | CORE_mutex_Status mutex_status; |
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| 75 | CORE_semaphore_Status semaphore_status; |
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| 76 | |
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| 77 | the_semaphore = _Semaphore_Get( id, &location ); |
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| 78 | switch ( location ) { |
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| 79 | |
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| 80 | case OBJECTS_REMOTE: |
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| 81 | #if defined(RTEMS_MULTIPROCESSING) |
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| 82 | return _Semaphore_MP_Send_request_packet( |
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| 83 | SEMAPHORE_MP_RELEASE_REQUEST, |
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| 84 | id, |
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| 85 | 0, /* Not used */ |
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| 86 | MPCI_DEFAULT_TIMEOUT |
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| 87 | ); |
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| 88 | #endif |
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| 89 | |
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| 90 | case OBJECTS_ERROR: |
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| 91 | return RTEMS_INVALID_ID; |
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| 92 | |
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| 93 | case OBJECTS_LOCAL: |
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[5870ac55] | 94 | if ( !_Attributes_Is_counting_semaphore(the_semaphore->attribute_set) ) { |
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[c06d8f64] | 95 | mutex_status = _CORE_mutex_Surrender( |
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[ab654be] | 96 | &the_semaphore->Core_control.mutex, |
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| 97 | id, |
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| 98 | MUTEX_MP_SUPPORT |
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| 99 | ); |
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[c06d8f64] | 100 | _Thread_Enable_dispatch(); |
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| 101 | return _Semaphore_Translate_core_mutex_return_code( mutex_status ); |
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[ab654be] | 102 | } else { |
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[c06d8f64] | 103 | semaphore_status = _CORE_semaphore_Surrender( |
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[ab654be] | 104 | &the_semaphore->Core_control.semaphore, |
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| 105 | id, |
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| 106 | MUTEX_MP_SUPPORT |
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| 107 | ); |
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[c06d8f64] | 108 | _Thread_Enable_dispatch(); |
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| 109 | return |
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| 110 | _Semaphore_Translate_core_semaphore_return_code( semaphore_status ); |
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[ab654be] | 111 | } |
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[c06d8f64] | 112 | } |
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| 113 | |
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| 114 | return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ |
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| 115 | } |
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