Clone of mbed rtos 2 for easy accessibility.
Fork of mbed-rtos by
rtx/TARGET_CORTEX_M/rt_Mutex.c@125:5713cbbdb706, 2017-07-04 (annotated)
- Committer:
- Kojto
- Date:
- Tue Jul 04 13:32:20 2017 +0100
- Revision:
- 125:5713cbbdb706
- Parent:
- 112:53ace74b190c
replace mbed_rtx by mbed_rtx4
Not causing a conflict with mbed_rtx that is for newer rtos
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 49:77c8e4604045 | 1 | /*---------------------------------------------------------------------------- |
mbed_official | 112:53ace74b190c | 2 | * CMSIS-RTOS - RTX |
mbed_official | 49:77c8e4604045 | 3 | *---------------------------------------------------------------------------- |
mbed_official | 49:77c8e4604045 | 4 | * Name: RT_MUTEX.C |
mbed_official | 49:77c8e4604045 | 5 | * Purpose: Implements mutex synchronization objects |
mbed_official | 112:53ace74b190c | 6 | * Rev.: V4.79 |
mbed_official | 49:77c8e4604045 | 7 | *---------------------------------------------------------------------------- |
mbed_official | 49:77c8e4604045 | 8 | * |
mbed_official | 112:53ace74b190c | 9 | * Copyright (c) 1999-2009 KEIL, 2009-2015 ARM Germany GmbH |
mbed_official | 49:77c8e4604045 | 10 | * All rights reserved. |
mbed_official | 49:77c8e4604045 | 11 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 49:77c8e4604045 | 12 | * modification, are permitted provided that the following conditions are met: |
mbed_official | 49:77c8e4604045 | 13 | * - Redistributions of source code must retain the above copyright |
mbed_official | 49:77c8e4604045 | 14 | * notice, this list of conditions and the following disclaimer. |
mbed_official | 49:77c8e4604045 | 15 | * - Redistributions in binary form must reproduce the above copyright |
mbed_official | 49:77c8e4604045 | 16 | * notice, this list of conditions and the following disclaimer in the |
mbed_official | 49:77c8e4604045 | 17 | * documentation and/or other materials provided with the distribution. |
mbed_official | 49:77c8e4604045 | 18 | * - Neither the name of ARM nor the names of its contributors may be used |
mbed_official | 49:77c8e4604045 | 19 | * to endorse or promote products derived from this software without |
mbed_official | 49:77c8e4604045 | 20 | * specific prior written permission. |
mbed_official | 49:77c8e4604045 | 21 | * |
mbed_official | 49:77c8e4604045 | 22 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
mbed_official | 49:77c8e4604045 | 23 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
mbed_official | 49:77c8e4604045 | 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
mbed_official | 49:77c8e4604045 | 25 | * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE |
mbed_official | 49:77c8e4604045 | 26 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
mbed_official | 49:77c8e4604045 | 27 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
mbed_official | 49:77c8e4604045 | 28 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
mbed_official | 49:77c8e4604045 | 29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
mbed_official | 49:77c8e4604045 | 30 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
mbed_official | 49:77c8e4604045 | 31 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
mbed_official | 49:77c8e4604045 | 32 | * POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 49:77c8e4604045 | 33 | *---------------------------------------------------------------------------*/ |
mbed_official | 49:77c8e4604045 | 34 | |
mbed_official | 49:77c8e4604045 | 35 | #include "rt_TypeDef.h" |
mbed_official | 112:53ace74b190c | 36 | #include "RTX_Config.h" |
mbed_official | 49:77c8e4604045 | 37 | #include "rt_List.h" |
mbed_official | 49:77c8e4604045 | 38 | #include "rt_Task.h" |
mbed_official | 49:77c8e4604045 | 39 | #include "rt_Mutex.h" |
mbed_official | 49:77c8e4604045 | 40 | #include "rt_HAL_CM.h" |
mbed_official | 49:77c8e4604045 | 41 | |
mbed_official | 49:77c8e4604045 | 42 | |
mbed_official | 49:77c8e4604045 | 43 | /*---------------------------------------------------------------------------- |
mbed_official | 49:77c8e4604045 | 44 | * Functions |
mbed_official | 49:77c8e4604045 | 45 | *---------------------------------------------------------------------------*/ |
mbed_official | 49:77c8e4604045 | 46 | |
mbed_official | 49:77c8e4604045 | 47 | |
mbed_official | 49:77c8e4604045 | 48 | /*--------------------------- rt_mut_init -----------------------------------*/ |
mbed_official | 49:77c8e4604045 | 49 | |
mbed_official | 49:77c8e4604045 | 50 | void rt_mut_init (OS_ID mutex) { |
mbed_official | 49:77c8e4604045 | 51 | /* Initialize a mutex object */ |
mbed_official | 49:77c8e4604045 | 52 | P_MUCB p_MCB = mutex; |
mbed_official | 49:77c8e4604045 | 53 | |
mbed_official | 49:77c8e4604045 | 54 | p_MCB->cb_type = MUCB; |
mbed_official | 112:53ace74b190c | 55 | p_MCB->level = 0U; |
mbed_official | 49:77c8e4604045 | 56 | p_MCB->p_lnk = NULL; |
mbed_official | 49:77c8e4604045 | 57 | p_MCB->owner = NULL; |
mbed_official | 112:53ace74b190c | 58 | p_MCB->p_mlnk = NULL; |
mbed_official | 49:77c8e4604045 | 59 | } |
mbed_official | 49:77c8e4604045 | 60 | |
mbed_official | 49:77c8e4604045 | 61 | |
mbed_official | 49:77c8e4604045 | 62 | /*--------------------------- rt_mut_delete ---------------------------------*/ |
mbed_official | 49:77c8e4604045 | 63 | |
mbed_official | 49:77c8e4604045 | 64 | #ifdef __CMSIS_RTOS |
mbed_official | 49:77c8e4604045 | 65 | OS_RESULT rt_mut_delete (OS_ID mutex) { |
mbed_official | 49:77c8e4604045 | 66 | /* Delete a mutex object */ |
mbed_official | 49:77c8e4604045 | 67 | P_MUCB p_MCB = mutex; |
mbed_official | 49:77c8e4604045 | 68 | P_TCB p_TCB; |
mbed_official | 112:53ace74b190c | 69 | P_MUCB p_mlnk; |
mbed_official | 112:53ace74b190c | 70 | U8 prio; |
mbed_official | 49:77c8e4604045 | 71 | |
mbed_official | 112:53ace74b190c | 72 | if (p_MCB->level != 0U) { |
mbed_official | 112:53ace74b190c | 73 | |
mbed_official | 112:53ace74b190c | 74 | p_TCB = p_MCB->owner; |
mbed_official | 112:53ace74b190c | 75 | |
mbed_official | 112:53ace74b190c | 76 | /* Remove mutex from task mutex owner list. */ |
mbed_official | 112:53ace74b190c | 77 | p_mlnk = p_TCB->p_mlnk; |
mbed_official | 112:53ace74b190c | 78 | if (p_mlnk == p_MCB) { |
mbed_official | 112:53ace74b190c | 79 | p_TCB->p_mlnk = p_MCB->p_mlnk; |
mbed_official | 112:53ace74b190c | 80 | } |
mbed_official | 112:53ace74b190c | 81 | else { |
mbed_official | 112:53ace74b190c | 82 | while (p_mlnk) { |
mbed_official | 112:53ace74b190c | 83 | if (p_mlnk->p_mlnk == p_MCB) { |
mbed_official | 112:53ace74b190c | 84 | p_mlnk->p_mlnk = p_MCB->p_mlnk; |
mbed_official | 112:53ace74b190c | 85 | break; |
mbed_official | 112:53ace74b190c | 86 | } |
mbed_official | 112:53ace74b190c | 87 | p_mlnk = p_mlnk->p_mlnk; |
mbed_official | 112:53ace74b190c | 88 | } |
mbed_official | 49:77c8e4604045 | 89 | } |
mbed_official | 112:53ace74b190c | 90 | |
mbed_official | 112:53ace74b190c | 91 | /* Restore owner task's priority. */ |
mbed_official | 112:53ace74b190c | 92 | prio = p_TCB->prio_base; |
mbed_official | 112:53ace74b190c | 93 | p_mlnk = p_TCB->p_mlnk; |
mbed_official | 112:53ace74b190c | 94 | while (p_mlnk) { |
mbed_official | 112:53ace74b190c | 95 | if ((p_mlnk->p_lnk != NULL) && (p_mlnk->p_lnk->prio > prio)) { |
mbed_official | 112:53ace74b190c | 96 | /* A task with higher priority is waiting for mutex. */ |
mbed_official | 112:53ace74b190c | 97 | prio = p_mlnk->p_lnk->prio; |
mbed_official | 112:53ace74b190c | 98 | } |
mbed_official | 112:53ace74b190c | 99 | p_mlnk = p_mlnk->p_mlnk; |
mbed_official | 112:53ace74b190c | 100 | } |
mbed_official | 112:53ace74b190c | 101 | if (p_TCB->prio != prio) { |
mbed_official | 112:53ace74b190c | 102 | p_TCB->prio = prio; |
mbed_official | 112:53ace74b190c | 103 | if (p_TCB != os_tsk.run) { |
mbed_official | 112:53ace74b190c | 104 | rt_resort_prio (p_TCB); |
mbed_official | 112:53ace74b190c | 105 | } |
mbed_official | 112:53ace74b190c | 106 | } |
mbed_official | 112:53ace74b190c | 107 | |
mbed_official | 49:77c8e4604045 | 108 | } |
mbed_official | 49:77c8e4604045 | 109 | |
mbed_official | 49:77c8e4604045 | 110 | while (p_MCB->p_lnk != NULL) { |
mbed_official | 49:77c8e4604045 | 111 | /* A task is waiting for mutex. */ |
mbed_official | 49:77c8e4604045 | 112 | p_TCB = rt_get_first ((P_XCB)p_MCB); |
mbed_official | 112:53ace74b190c | 113 | rt_ret_val(p_TCB, 0U/*osOK*/); |
mbed_official | 49:77c8e4604045 | 114 | rt_rmv_dly(p_TCB); |
mbed_official | 49:77c8e4604045 | 115 | p_TCB->state = READY; |
mbed_official | 49:77c8e4604045 | 116 | rt_put_prio (&os_rdy, p_TCB); |
mbed_official | 49:77c8e4604045 | 117 | } |
mbed_official | 49:77c8e4604045 | 118 | |
mbed_official | 112:53ace74b190c | 119 | if ((os_rdy.p_lnk != NULL) && (os_rdy.p_lnk->prio > os_tsk.run->prio)) { |
mbed_official | 49:77c8e4604045 | 120 | /* preempt running task */ |
mbed_official | 49:77c8e4604045 | 121 | rt_put_prio (&os_rdy, os_tsk.run); |
mbed_official | 49:77c8e4604045 | 122 | os_tsk.run->state = READY; |
mbed_official | 49:77c8e4604045 | 123 | rt_dispatch (NULL); |
mbed_official | 49:77c8e4604045 | 124 | } |
mbed_official | 49:77c8e4604045 | 125 | |
mbed_official | 112:53ace74b190c | 126 | p_MCB->cb_type = 0U; |
mbed_official | 49:77c8e4604045 | 127 | |
mbed_official | 49:77c8e4604045 | 128 | return (OS_R_OK); |
mbed_official | 49:77c8e4604045 | 129 | } |
mbed_official | 49:77c8e4604045 | 130 | #endif |
mbed_official | 49:77c8e4604045 | 131 | |
mbed_official | 49:77c8e4604045 | 132 | |
mbed_official | 49:77c8e4604045 | 133 | /*--------------------------- rt_mut_release --------------------------------*/ |
mbed_official | 49:77c8e4604045 | 134 | |
mbed_official | 49:77c8e4604045 | 135 | OS_RESULT rt_mut_release (OS_ID mutex) { |
mbed_official | 49:77c8e4604045 | 136 | /* Release a mutex object */ |
mbed_official | 49:77c8e4604045 | 137 | P_MUCB p_MCB = mutex; |
mbed_official | 49:77c8e4604045 | 138 | P_TCB p_TCB; |
mbed_official | 112:53ace74b190c | 139 | P_MUCB p_mlnk; |
mbed_official | 112:53ace74b190c | 140 | U8 prio; |
mbed_official | 49:77c8e4604045 | 141 | |
mbed_official | 112:53ace74b190c | 142 | if ((p_MCB->level == 0U) || (p_MCB->owner != os_tsk.run)) { |
mbed_official | 49:77c8e4604045 | 143 | /* Unbalanced mutex release or task is not the owner */ |
mbed_official | 49:77c8e4604045 | 144 | return (OS_R_NOK); |
mbed_official | 49:77c8e4604045 | 145 | } |
mbed_official | 112:53ace74b190c | 146 | if (--p_MCB->level != 0U) { |
mbed_official | 49:77c8e4604045 | 147 | return (OS_R_OK); |
mbed_official | 49:77c8e4604045 | 148 | } |
mbed_official | 112:53ace74b190c | 149 | |
mbed_official | 112:53ace74b190c | 150 | /* Remove mutex from task mutex owner list. */ |
mbed_official | 112:53ace74b190c | 151 | p_mlnk = os_tsk.run->p_mlnk; |
mbed_official | 112:53ace74b190c | 152 | if (p_mlnk == p_MCB) { |
mbed_official | 112:53ace74b190c | 153 | os_tsk.run->p_mlnk = p_MCB->p_mlnk; |
mbed_official | 112:53ace74b190c | 154 | } |
mbed_official | 112:53ace74b190c | 155 | else { |
mbed_official | 112:53ace74b190c | 156 | while (p_mlnk) { |
mbed_official | 112:53ace74b190c | 157 | if (p_mlnk->p_mlnk == p_MCB) { |
mbed_official | 112:53ace74b190c | 158 | p_mlnk->p_mlnk = p_MCB->p_mlnk; |
mbed_official | 112:53ace74b190c | 159 | break; |
mbed_official | 112:53ace74b190c | 160 | } |
mbed_official | 112:53ace74b190c | 161 | p_mlnk = p_mlnk->p_mlnk; |
mbed_official | 112:53ace74b190c | 162 | } |
mbed_official | 112:53ace74b190c | 163 | } |
mbed_official | 112:53ace74b190c | 164 | |
mbed_official | 49:77c8e4604045 | 165 | /* Restore owner task's priority. */ |
mbed_official | 112:53ace74b190c | 166 | prio = os_tsk.run->prio_base; |
mbed_official | 112:53ace74b190c | 167 | p_mlnk = os_tsk.run->p_mlnk; |
mbed_official | 112:53ace74b190c | 168 | while (p_mlnk) { |
mbed_official | 112:53ace74b190c | 169 | if ((p_mlnk->p_lnk != NULL) && (p_mlnk->p_lnk->prio > prio)) { |
mbed_official | 112:53ace74b190c | 170 | /* A task with higher priority is waiting for mutex. */ |
mbed_official | 112:53ace74b190c | 171 | prio = p_mlnk->p_lnk->prio; |
mbed_official | 112:53ace74b190c | 172 | } |
mbed_official | 112:53ace74b190c | 173 | p_mlnk = p_mlnk->p_mlnk; |
mbed_official | 112:53ace74b190c | 174 | } |
mbed_official | 112:53ace74b190c | 175 | os_tsk.run->prio = prio; |
mbed_official | 112:53ace74b190c | 176 | |
mbed_official | 49:77c8e4604045 | 177 | if (p_MCB->p_lnk != NULL) { |
mbed_official | 49:77c8e4604045 | 178 | /* A task is waiting for mutex. */ |
mbed_official | 49:77c8e4604045 | 179 | p_TCB = rt_get_first ((P_XCB)p_MCB); |
mbed_official | 49:77c8e4604045 | 180 | #ifdef __CMSIS_RTOS |
mbed_official | 112:53ace74b190c | 181 | rt_ret_val(p_TCB, 0U/*osOK*/); |
mbed_official | 49:77c8e4604045 | 182 | #else |
mbed_official | 112:53ace74b190c | 183 | rt_ret_val(p_TCB, OS_R_MUT); |
mbed_official | 49:77c8e4604045 | 184 | #endif |
mbed_official | 49:77c8e4604045 | 185 | rt_rmv_dly (p_TCB); |
mbed_official | 49:77c8e4604045 | 186 | /* A waiting task becomes the owner of this mutex. */ |
mbed_official | 112:53ace74b190c | 187 | p_MCB->level = 1U; |
mbed_official | 112:53ace74b190c | 188 | p_MCB->owner = p_TCB; |
mbed_official | 112:53ace74b190c | 189 | p_MCB->p_mlnk = p_TCB->p_mlnk; |
mbed_official | 112:53ace74b190c | 190 | p_TCB->p_mlnk = p_MCB; |
mbed_official | 49:77c8e4604045 | 191 | /* Priority inversion, check which task continues. */ |
mbed_official | 49:77c8e4604045 | 192 | if (os_tsk.run->prio >= rt_rdy_prio()) { |
mbed_official | 49:77c8e4604045 | 193 | rt_dispatch (p_TCB); |
mbed_official | 49:77c8e4604045 | 194 | } |
mbed_official | 49:77c8e4604045 | 195 | else { |
mbed_official | 49:77c8e4604045 | 196 | /* Ready task has higher priority than running task. */ |
mbed_official | 49:77c8e4604045 | 197 | rt_put_prio (&os_rdy, os_tsk.run); |
mbed_official | 49:77c8e4604045 | 198 | rt_put_prio (&os_rdy, p_TCB); |
mbed_official | 49:77c8e4604045 | 199 | os_tsk.run->state = READY; |
mbed_official | 49:77c8e4604045 | 200 | p_TCB->state = READY; |
mbed_official | 49:77c8e4604045 | 201 | rt_dispatch (NULL); |
mbed_official | 49:77c8e4604045 | 202 | } |
mbed_official | 49:77c8e4604045 | 203 | } |
mbed_official | 49:77c8e4604045 | 204 | else { |
mbed_official | 112:53ace74b190c | 205 | /* Check if own priority lowered by priority inversion. */ |
mbed_official | 49:77c8e4604045 | 206 | if (rt_rdy_prio() > os_tsk.run->prio) { |
mbed_official | 49:77c8e4604045 | 207 | rt_put_prio (&os_rdy, os_tsk.run); |
mbed_official | 49:77c8e4604045 | 208 | os_tsk.run->state = READY; |
mbed_official | 49:77c8e4604045 | 209 | rt_dispatch (NULL); |
mbed_official | 49:77c8e4604045 | 210 | } |
mbed_official | 49:77c8e4604045 | 211 | } |
mbed_official | 49:77c8e4604045 | 212 | return (OS_R_OK); |
mbed_official | 49:77c8e4604045 | 213 | } |
mbed_official | 49:77c8e4604045 | 214 | |
mbed_official | 49:77c8e4604045 | 215 | |
mbed_official | 49:77c8e4604045 | 216 | /*--------------------------- rt_mut_wait -----------------------------------*/ |
mbed_official | 49:77c8e4604045 | 217 | |
mbed_official | 49:77c8e4604045 | 218 | OS_RESULT rt_mut_wait (OS_ID mutex, U16 timeout) { |
mbed_official | 49:77c8e4604045 | 219 | /* Wait for a mutex, continue when mutex is free. */ |
mbed_official | 49:77c8e4604045 | 220 | P_MUCB p_MCB = mutex; |
mbed_official | 49:77c8e4604045 | 221 | |
mbed_official | 112:53ace74b190c | 222 | if (p_MCB->level == 0U) { |
mbed_official | 112:53ace74b190c | 223 | p_MCB->owner = os_tsk.run; |
mbed_official | 112:53ace74b190c | 224 | p_MCB->p_mlnk = os_tsk.run->p_mlnk; |
mbed_official | 112:53ace74b190c | 225 | os_tsk.run->p_mlnk = p_MCB; |
mbed_official | 49:77c8e4604045 | 226 | goto inc; |
mbed_official | 49:77c8e4604045 | 227 | } |
mbed_official | 49:77c8e4604045 | 228 | if (p_MCB->owner == os_tsk.run) { |
mbed_official | 49:77c8e4604045 | 229 | /* OK, running task is the owner of this mutex. */ |
mbed_official | 49:77c8e4604045 | 230 | inc:p_MCB->level++; |
mbed_official | 49:77c8e4604045 | 231 | return (OS_R_OK); |
mbed_official | 49:77c8e4604045 | 232 | } |
mbed_official | 49:77c8e4604045 | 233 | /* Mutex owned by another task, wait until released. */ |
mbed_official | 112:53ace74b190c | 234 | if (timeout == 0U) { |
mbed_official | 49:77c8e4604045 | 235 | return (OS_R_TMO); |
mbed_official | 49:77c8e4604045 | 236 | } |
mbed_official | 49:77c8e4604045 | 237 | /* Raise the owner task priority if lower than current priority. */ |
mbed_official | 49:77c8e4604045 | 238 | /* This priority inversion is called priority inheritance. */ |
mbed_official | 112:53ace74b190c | 239 | if (p_MCB->owner->prio < os_tsk.run->prio) { |
mbed_official | 49:77c8e4604045 | 240 | p_MCB->owner->prio = os_tsk.run->prio; |
mbed_official | 49:77c8e4604045 | 241 | rt_resort_prio (p_MCB->owner); |
mbed_official | 49:77c8e4604045 | 242 | } |
mbed_official | 49:77c8e4604045 | 243 | if (p_MCB->p_lnk != NULL) { |
mbed_official | 49:77c8e4604045 | 244 | rt_put_prio ((P_XCB)p_MCB, os_tsk.run); |
mbed_official | 49:77c8e4604045 | 245 | } |
mbed_official | 49:77c8e4604045 | 246 | else { |
mbed_official | 49:77c8e4604045 | 247 | p_MCB->p_lnk = os_tsk.run; |
mbed_official | 49:77c8e4604045 | 248 | os_tsk.run->p_lnk = NULL; |
mbed_official | 49:77c8e4604045 | 249 | os_tsk.run->p_rlnk = (P_TCB)p_MCB; |
mbed_official | 49:77c8e4604045 | 250 | } |
mbed_official | 49:77c8e4604045 | 251 | rt_block(timeout, WAIT_MUT); |
mbed_official | 49:77c8e4604045 | 252 | return (OS_R_TMO); |
mbed_official | 49:77c8e4604045 | 253 | } |
mbed_official | 49:77c8e4604045 | 254 | |
mbed_official | 49:77c8e4604045 | 255 | |
mbed_official | 49:77c8e4604045 | 256 | /*---------------------------------------------------------------------------- |
mbed_official | 49:77c8e4604045 | 257 | * end of file |
mbed_official | 49:77c8e4604045 | 258 | *---------------------------------------------------------------------------*/ |
mbed_official | 49:77c8e4604045 | 259 |