[df49c60] | 1 | /* |
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| 2 | * RTEMS threads compatibily routines for libgcc2. |
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| 3 | * |
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| 4 | * by: Rosimildo da Silva ( rdasilva@connecttel.com |
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| 5 | * |
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| 6 | * Used ideas from: |
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| 7 | * W. Eric Norum |
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| 8 | * Canadian Light Source |
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| 9 | * University of Saskatchewan |
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| 10 | * Saskatoon, Saskatchewan, CANADA |
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| 11 | * eric@cls.usask.ca |
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| 12 | * |
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| 13 | * Eric sent some e-mail in the rtems-list as a start point for this |
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| 14 | * module implementation. |
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| 15 | * |
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[ab660e77] | 16 | * $Id$ |
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[df49c60] | 17 | */ |
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| 18 | |
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[f49a82f3] | 19 | /* |
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| 20 | * This file is only used if using gcc |
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| 21 | */ |
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| 22 | #if defined(__GNUC__) |
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| 23 | |
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[9c49db4] | 24 | #if HAVE_CONFIG_H |
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| 25 | #include "config.h" |
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| 26 | #endif |
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| 27 | |
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[df49c60] | 28 | /* We might not need, defined just in case */ |
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| 29 | #define __RTEMS_INSIDE__ 1 |
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| 30 | |
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| 31 | |
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| 32 | #include <stdlib.h> |
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| 33 | #include <stdio.h> |
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| 34 | |
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| 35 | #include <rtems.h> |
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| 36 | #include <rtems/system.h> |
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[c4477581] | 37 | #include <rtems/error.h> /* rtems_panic */ |
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[df49c60] | 38 | #include <rtems/rtems/tasks.h> |
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| 39 | |
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[50f32b11] | 40 | /* |
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[df49c60] | 41 | * These typedefs should match with the ones defined in the file |
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| 42 | * gcc/gthr-rtems.h in the gcc distribution. |
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[4a2fee47] | 43 | * FIXME: T.S, 2007/01/31: -> gcc/gthr-rtems.h still declares |
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| 44 | * void * __gthread_key_t; |
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[df49c60] | 45 | */ |
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[4a2fee47] | 46 | typedef struct __gthread_key_ { |
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| 47 | void *val; /* this is switched with the task */ |
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| 48 | void (*dtor)(void*); /* this remains in place for all tasks */ |
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| 49 | } __gthread_key, *__gthread_key_t; |
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[df49c60] | 50 | typedef int __gthread_once_t; |
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| 51 | typedef void *__gthread_mutex_t; |
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[f49a82f3] | 52 | typedef void *__gthread_recursive_mutex_t; |
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[df49c60] | 53 | |
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| 54 | /* uncomment this if you need to debug this interface */ |
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| 55 | |
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| 56 | /* |
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| 57 | #define DEBUG_GXX_WRAPPERS 1 |
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| 58 | */ |
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| 59 | |
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| 60 | #ifdef DEBUG_GXX_WRAPPERS |
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| 61 | /* local function to return the ID of the calling thread */ |
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| 62 | static rtems_id get_tid( void ) |
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| 63 | { |
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[50f32b11] | 64 | rtems_id id = 0; |
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[df49c60] | 65 | rtems_task_ident( RTEMS_SELF, 0, &id ); |
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| 66 | return id; |
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| 67 | } |
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| 68 | #endif |
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| 69 | |
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| 70 | |
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[616b9f5] | 71 | int rtems_gxx_once(__gthread_once_t *once, void (*func) (void)) |
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[df49c60] | 72 | { |
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| 73 | #ifdef DEBUG_GXX_WRAPPERS |
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| 74 | printk( "gxx_wrappers: once=%x, func=%x\n", *once, func ); |
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| 75 | #endif |
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[49155d9] | 76 | if( *(volatile __gthread_once_t *)once == 0 ) |
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[df49c60] | 77 | { |
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[49155d9] | 78 | rtems_mode saveMode; |
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[4a2fee47] | 79 | __gthread_once_t o; |
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[49155d9] | 80 | rtems_task_mode(RTEMS_NO_PREEMPT, RTEMS_PREEMPT_MASK, &saveMode); |
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[4a2fee47] | 81 | if( (o = *(volatile __gthread_once_t *)once) == 0 ) |
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[49155d9] | 82 | { |
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| 83 | *(volatile __gthread_once_t *)once = 1; |
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| 84 | } |
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| 85 | rtems_task_mode(saveMode, RTEMS_PREEMPT_MASK, &saveMode); |
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[4a2fee47] | 86 | if ( o == 0 ) |
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| 87 | (*func)(); |
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[df49c60] | 88 | } |
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| 89 | return 0; |
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| 90 | } |
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| 91 | |
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| 92 | |
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| 93 | int rtems_gxx_key_create (__gthread_key_t *key, void (*dtor) (void *)) |
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| 94 | { |
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| 95 | /* Ok, this can be a bit tricky. We are going to return a "key" as a |
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| 96 | * pointer to the buffer that will hold the value of the key itself. |
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[ab660e77] | 97 | * We have to to this, because the others functions on this interface |
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[df49c60] | 98 | * deal with the value of the key, as used with the POSIX API. |
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| 99 | */ |
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| 100 | /* Do not pull your hair, trust me this works. :-) */ |
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[4a2fee47] | 101 | __gthread_key_t new_key = ( __gthread_key_t )malloc( sizeof( *new_key ) ); |
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| 102 | *key = new_key; |
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| 103 | new_key->val = NULL; |
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| 104 | new_key->dtor = dtor; |
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[df49c60] | 105 | |
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| 106 | #ifdef DEBUG_GXX_WRAPPERS |
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| 107 | printk( "gxx_wrappers: create key=%x, dtor=%x, new_key=%x\n", key, dtor, new_key ); |
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| 108 | #endif |
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| 109 | /* register with RTEMS the buffer that will hold the key values */ |
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[4a2fee47] | 110 | if( rtems_task_variable_add( RTEMS_SELF, (void **)new_key, dtor ) == RTEMS_SUCCESSFUL ) |
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[df49c60] | 111 | return 0; |
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| 112 | return -1; |
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| 113 | } |
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| 114 | |
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| 115 | int rtems_gxx_key_dtor (__gthread_key_t key, void *ptr) |
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| 116 | { |
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| 117 | #ifdef DEBUG_GXX_WRAPPERS |
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| 118 | printk( "gxx_wrappers: dtor key=%x, ptr=%x\n", key, ptr ); |
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| 119 | #endif |
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[4a2fee47] | 120 | key->val = 0; |
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[df49c60] | 121 | return 0; |
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| 122 | } |
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| 123 | |
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| 124 | int rtems_gxx_key_delete (__gthread_key_t key) |
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| 125 | { |
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| 126 | #ifdef DEBUG_GXX_WRAPPERS |
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| 127 | printk( "gxx_wrappers: delete key=%x\n", key ); |
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| 128 | #endif |
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| 129 | /* register with RTEMS the buffer that will hold the key values */ |
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| 130 | if( rtems_task_variable_delete( RTEMS_SELF, (void **)key ) == RTEMS_SUCCESSFUL ) |
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| 131 | { |
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[4a2fee47] | 132 | /* Hmm - hopefully all tasks using this key have gone away... */ |
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[df49c60] | 133 | if( key ) free( (void *)key ); |
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| 134 | return 0; |
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| 135 | } |
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| 136 | return 0; |
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| 137 | } |
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| 138 | |
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| 139 | |
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| 140 | void *rtems_gxx_getspecific(__gthread_key_t key) |
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| 141 | { |
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| 142 | void *p= 0; |
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| 143 | |
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| 144 | /* register with RTEMS the buffer that will hold the key values */ |
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| 145 | if( rtems_task_variable_get( RTEMS_SELF, (void **)key, &p ) == RTEMS_SUCCESSFUL ) |
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| 146 | { |
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| 147 | /* We do not have to do this, but what the heck ! */ |
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[4a2fee47] | 148 | p= key->val; |
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[df49c60] | 149 | } |
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| 150 | else |
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| 151 | { |
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| 152 | /* fisrt time, always set to zero, it is unknown the value that the others |
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| 153 | * threads are using at the moment of this call |
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| 154 | */ |
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[4a2fee47] | 155 | if( rtems_task_variable_add( RTEMS_SELF, (void **)key, key->dtor ) != RTEMS_SUCCESSFUL ) |
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[df49c60] | 156 | { |
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[6d135639] | 157 | rtems_panic ("rtems_gxx_getspecific"); |
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[df49c60] | 158 | } |
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[4a2fee47] | 159 | key->val = (void *)0; |
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[df49c60] | 160 | } |
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| 161 | |
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| 162 | #ifdef DEBUG_GXX_WRAPPERS |
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| 163 | printk( "gxx_wrappers: getspecific key=%x, ptr=%x, id=%x\n", key, p, get_tid() ); |
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| 164 | #endif |
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| 165 | return p; |
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| 166 | } |
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| 167 | |
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| 168 | |
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| 169 | int rtems_gxx_setspecific(__gthread_key_t key, const void *ptr) |
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| 170 | { |
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| 171 | #ifdef DEBUG_GXX_WRAPPERS |
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| 172 | printk( "gxx_wrappers: setspecific key=%x, ptr=%x, id=%x\n", key, ptr, get_tid() ); |
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| 173 | #endif |
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| 174 | /* register with RTEMS the buffer that will hold the key values */ |
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[4a2fee47] | 175 | if( rtems_task_variable_add( RTEMS_SELF, (void **)key, key->dtor ) == RTEMS_SUCCESSFUL ) |
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[df49c60] | 176 | { |
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| 177 | /* now let's set the proper value */ |
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[4a2fee47] | 178 | key->val = (void *)ptr; |
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[df49c60] | 179 | return 0; |
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| 180 | } |
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| 181 | return -1; |
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| 182 | } |
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| 183 | |
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| 184 | |
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| 185 | /* |
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| 186 | * MUTEX support |
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| 187 | */ |
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| 188 | void rtems_gxx_mutex_init (__gthread_mutex_t *mutex) |
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| 189 | { |
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| 190 | #ifdef DEBUG_GXX_WRAPPERS |
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| 191 | printk( "gxx_wrappers: mutex init =%X\n", *mutex ); |
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| 192 | #endif |
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| 193 | if( rtems_semaphore_create( rtems_build_name ('G', 'C', 'C', '2'), |
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| 194 | 1, |
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| 195 | RTEMS_PRIORITY|RTEMS_BINARY_SEMAPHORE |
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| 196 | |RTEMS_INHERIT_PRIORITY | RTEMS_NO_PRIORITY_CEILING|RTEMS_LOCAL, |
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| 197 | 0, |
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| 198 | (rtems_id *)mutex ) != RTEMS_SUCCESSFUL ) |
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| 199 | { |
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[6d135639] | 200 | rtems_panic ("rtems_gxx_mutex_init"); |
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[df49c60] | 201 | } |
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| 202 | #ifdef DEBUG_GXX_WRAPPERS |
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| 203 | printk( "gxx_wrappers: mutex init complete =%X\n", *mutex ); |
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| 204 | #endif |
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| 205 | } |
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| 206 | |
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| 207 | int rtems_gxx_mutex_lock (__gthread_mutex_t *mutex) |
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| 208 | { |
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| 209 | #ifdef DEBUG_GXX_WRAPPERS |
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| 210 | printk( "gxx_wrappers: lock mutex=%X\n", *mutex ); |
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| 211 | #endif |
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[50f32b11] | 212 | return ( rtems_semaphore_obtain( (rtems_id)*mutex, |
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[df49c60] | 213 | RTEMS_WAIT, RTEMS_NO_TIMEOUT ) == RTEMS_SUCCESSFUL) ? 0 : -1; |
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| 214 | } |
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| 215 | |
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| 216 | int rtems_gxx_mutex_trylock (__gthread_mutex_t *mutex) |
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| 217 | { |
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| 218 | #ifdef DEBUG_GXX_WRAPPERS |
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| 219 | printk( "gxx_wrappers: trylock mutex=%X\n", *mutex ); |
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| 220 | #endif |
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[50f32b11] | 221 | return (rtems_semaphore_obtain ((rtems_id)*mutex, |
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[df49c60] | 222 | RTEMS_NO_WAIT, 0) == RTEMS_SUCCESSFUL) ? 0 : -1; |
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| 223 | } |
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| 224 | |
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| 225 | int rtems_gxx_mutex_unlock (__gthread_mutex_t *mutex) |
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| 226 | { |
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| 227 | #ifdef DEBUG_GXX_WRAPPERS |
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| 228 | printk( "gxx_wrappers: unlock mutex=%X\n", *mutex ); |
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| 229 | #endif |
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| 230 | return (rtems_semaphore_release( (rtems_id)*mutex ) == RTEMS_SUCCESSFUL) ? 0 :-1; |
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| 231 | } |
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[f49a82f3] | 232 | |
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[6d1e301a] | 233 | void rtems_gxx_recursive_mutex_init(__gthread_recursive_mutex_t *mutex) |
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[f49a82f3] | 234 | { |
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| 235 | rtems_gxx_mutex_init(mutex); |
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| 236 | } |
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| 237 | |
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| 238 | int rtems_gxx_recursive_mutex_lock(__gthread_recursive_mutex_t *mutex) |
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| 239 | { |
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| 240 | return rtems_gxx_mutex_lock(mutex); |
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| 241 | } |
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| 242 | |
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| 243 | int rtems_gxx_recursive_mutex_trylock(__gthread_recursive_mutex_t *mutex) |
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| 244 | { |
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| 245 | return rtems_gxx_mutex_trylock(mutex); |
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| 246 | } |
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| 247 | |
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| 248 | int rtems_gxx_recursive_mutex_unlock(__gthread_recursive_mutex_t *mutex) |
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| 249 | { |
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| 250 | return rtems_gxx_mutex_unlock(mutex); |
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| 251 | } |
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| 252 | |
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| 253 | #endif /* __GNUC__ */ |
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