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Dependencies:   F7_Ethernet WebSocketClient mbed mcp3008

Fork of Nucleo_F746ZG_Ethernet by Dieter Graef

mbed-rtos/rtx/TARGET_CORTEX_M/rt_Mutex.c@0:f9b6112278fe, 2016-06-18 (annotated)

Committer:
DieterGraef
Date:
Sat Jun 18 10:49:12 2016 +0000
Revision:
0:f9b6112278fe
Ethernet for the NUCLEO STM32F746 Board Testprogram uses DHCP and NTP to set the clock

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DieterGraef 0:f9b6112278fe 1 /*----------------------------------------------------------------------------
DieterGraef 0:f9b6112278fe 2 * CMSIS-RTOS - RTX
DieterGraef 0:f9b6112278fe 3 *----------------------------------------------------------------------------
DieterGraef 0:f9b6112278fe 4 * Name: RT_MUTEX.C
DieterGraef 0:f9b6112278fe 5 * Purpose: Implements mutex synchronization objects
DieterGraef 0:f9b6112278fe 6 * Rev.: V4.79
DieterGraef 0:f9b6112278fe 7 *----------------------------------------------------------------------------
DieterGraef 0:f9b6112278fe 8 *
DieterGraef 0:f9b6112278fe 9 * Copyright (c) 1999-2009 KEIL, 2009-2015 ARM Germany GmbH
DieterGraef 0:f9b6112278fe 10 * All rights reserved.
DieterGraef 0:f9b6112278fe 11 * Redistribution and use in source and binary forms, with or without
DieterGraef 0:f9b6112278fe 12 * modification, are permitted provided that the following conditions are met:
DieterGraef 0:f9b6112278fe 13 * - Redistributions of source code must retain the above copyright
DieterGraef 0:f9b6112278fe 14 * notice, this list of conditions and the following disclaimer.
DieterGraef 0:f9b6112278fe 15 * - Redistributions in binary form must reproduce the above copyright
DieterGraef 0:f9b6112278fe 16 * notice, this list of conditions and the following disclaimer in the
DieterGraef 0:f9b6112278fe 17 * documentation and/or other materials provided with the distribution.
DieterGraef 0:f9b6112278fe 18 * - Neither the name of ARM nor the names of its contributors may be used
DieterGraef 0:f9b6112278fe 19 * to endorse or promote products derived from this software without
DieterGraef 0:f9b6112278fe 20 * specific prior written permission.
DieterGraef 0:f9b6112278fe 21 *
DieterGraef 0:f9b6112278fe 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
DieterGraef 0:f9b6112278fe 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
DieterGraef 0:f9b6112278fe 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
DieterGraef 0:f9b6112278fe 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
DieterGraef 0:f9b6112278fe 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
DieterGraef 0:f9b6112278fe 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
DieterGraef 0:f9b6112278fe 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
DieterGraef 0:f9b6112278fe 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
DieterGraef 0:f9b6112278fe 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
DieterGraef 0:f9b6112278fe 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
DieterGraef 0:f9b6112278fe 32 * POSSIBILITY OF SUCH DAMAGE.
DieterGraef 0:f9b6112278fe 33 *---------------------------------------------------------------------------*/
DieterGraef 0:f9b6112278fe 34
DieterGraef 0:f9b6112278fe 35 #include "rt_TypeDef.h"
DieterGraef 0:f9b6112278fe 36 #include "RTX_Config.h"
DieterGraef 0:f9b6112278fe 37 #include "rt_List.h"
DieterGraef 0:f9b6112278fe 38 #include "rt_Task.h"
DieterGraef 0:f9b6112278fe 39 #include "rt_Mutex.h"
DieterGraef 0:f9b6112278fe 40 #include "rt_HAL_CM.h"
DieterGraef 0:f9b6112278fe 41
DieterGraef 0:f9b6112278fe 42
DieterGraef 0:f9b6112278fe 43 /*----------------------------------------------------------------------------
DieterGraef 0:f9b6112278fe 44 * Functions
DieterGraef 0:f9b6112278fe 45 *---------------------------------------------------------------------------*/
DieterGraef 0:f9b6112278fe 46
DieterGraef 0:f9b6112278fe 47
DieterGraef 0:f9b6112278fe 48 /*--------------------------- rt_mut_init -----------------------------------*/
DieterGraef 0:f9b6112278fe 49
DieterGraef 0:f9b6112278fe 50 void rt_mut_init (OS_ID mutex) {
DieterGraef 0:f9b6112278fe 51 /* Initialize a mutex object */
DieterGraef 0:f9b6112278fe 52 P_MUCB p_MCB = mutex;
DieterGraef 0:f9b6112278fe 53
DieterGraef 0:f9b6112278fe 54 p_MCB->cb_type = MUCB;
DieterGraef 0:f9b6112278fe 55 p_MCB->level = 0U;
DieterGraef 0:f9b6112278fe 56 p_MCB->p_lnk = NULL;
DieterGraef 0:f9b6112278fe 57 p_MCB->owner = NULL;
DieterGraef 0:f9b6112278fe 58 p_MCB->p_mlnk = NULL;
DieterGraef 0:f9b6112278fe 59 }
DieterGraef 0:f9b6112278fe 60
DieterGraef 0:f9b6112278fe 61
DieterGraef 0:f9b6112278fe 62 /*--------------------------- rt_mut_delete ---------------------------------*/
DieterGraef 0:f9b6112278fe 63
DieterGraef 0:f9b6112278fe 64 #ifdef __CMSIS_RTOS
DieterGraef 0:f9b6112278fe 65 OS_RESULT rt_mut_delete (OS_ID mutex) {
DieterGraef 0:f9b6112278fe 66 /* Delete a mutex object */
DieterGraef 0:f9b6112278fe 67 P_MUCB p_MCB = mutex;
DieterGraef 0:f9b6112278fe 68 P_TCB p_TCB;
DieterGraef 0:f9b6112278fe 69 P_MUCB p_mlnk;
DieterGraef 0:f9b6112278fe 70 U8 prio;
DieterGraef 0:f9b6112278fe 71
DieterGraef 0:f9b6112278fe 72 if (p_MCB->level != 0U) {
DieterGraef 0:f9b6112278fe 73
DieterGraef 0:f9b6112278fe 74 p_TCB = p_MCB->owner;
DieterGraef 0:f9b6112278fe 75
DieterGraef 0:f9b6112278fe 76 /* Remove mutex from task mutex owner list. */
DieterGraef 0:f9b6112278fe 77 p_mlnk = p_TCB->p_mlnk;
DieterGraef 0:f9b6112278fe 78 if (p_mlnk == p_MCB) {
DieterGraef 0:f9b6112278fe 79 p_TCB->p_mlnk = p_MCB->p_mlnk;
DieterGraef 0:f9b6112278fe 80 }
DieterGraef 0:f9b6112278fe 81 else {
DieterGraef 0:f9b6112278fe 82 while (p_mlnk) {
DieterGraef 0:f9b6112278fe 83 if (p_mlnk->p_mlnk == p_MCB) {
DieterGraef 0:f9b6112278fe 84 p_mlnk->p_mlnk = p_MCB->p_mlnk;
DieterGraef 0:f9b6112278fe 85 break;
DieterGraef 0:f9b6112278fe 86 }
DieterGraef 0:f9b6112278fe 87 p_mlnk = p_mlnk->p_mlnk;
DieterGraef 0:f9b6112278fe 88 }
DieterGraef 0:f9b6112278fe 89 }
DieterGraef 0:f9b6112278fe 90
DieterGraef 0:f9b6112278fe 91 /* Restore owner task's priority. */
DieterGraef 0:f9b6112278fe 92 prio = p_TCB->prio_base;
DieterGraef 0:f9b6112278fe 93 p_mlnk = p_TCB->p_mlnk;
DieterGraef 0:f9b6112278fe 94 while (p_mlnk) {
DieterGraef 0:f9b6112278fe 95 if ((p_mlnk->p_lnk != NULL) && (p_mlnk->p_lnk->prio > prio)) {
DieterGraef 0:f9b6112278fe 96 /* A task with higher priority is waiting for mutex. */
DieterGraef 0:f9b6112278fe 97 prio = p_mlnk->p_lnk->prio;
DieterGraef 0:f9b6112278fe 98 }
DieterGraef 0:f9b6112278fe 99 p_mlnk = p_mlnk->p_mlnk;
DieterGraef 0:f9b6112278fe 100 }
DieterGraef 0:f9b6112278fe 101 if (p_TCB->prio != prio) {
DieterGraef 0:f9b6112278fe 102 p_TCB->prio = prio;
DieterGraef 0:f9b6112278fe 103 if (p_TCB != os_tsk.run) {
DieterGraef 0:f9b6112278fe 104 rt_resort_prio (p_TCB);
DieterGraef 0:f9b6112278fe 105 }
DieterGraef 0:f9b6112278fe 106 }
DieterGraef 0:f9b6112278fe 107
DieterGraef 0:f9b6112278fe 108 }
DieterGraef 0:f9b6112278fe 109
DieterGraef 0:f9b6112278fe 110 while (p_MCB->p_lnk != NULL) {
DieterGraef 0:f9b6112278fe 111 /* A task is waiting for mutex. */
DieterGraef 0:f9b6112278fe 112 p_TCB = rt_get_first ((P_XCB)p_MCB);
DieterGraef 0:f9b6112278fe 113 rt_ret_val(p_TCB, 0U/*osOK*/);
DieterGraef 0:f9b6112278fe 114 rt_rmv_dly(p_TCB);
DieterGraef 0:f9b6112278fe 115 p_TCB->state = READY;
DieterGraef 0:f9b6112278fe 116 rt_put_prio (&os_rdy, p_TCB);
DieterGraef 0:f9b6112278fe 117 }
DieterGraef 0:f9b6112278fe 118
DieterGraef 0:f9b6112278fe 119 if ((os_rdy.p_lnk != NULL) && (os_rdy.p_lnk->prio > os_tsk.run->prio)) {
DieterGraef 0:f9b6112278fe 120 /* preempt running task */
DieterGraef 0:f9b6112278fe 121 rt_put_prio (&os_rdy, os_tsk.run);
DieterGraef 0:f9b6112278fe 122 os_tsk.run->state = READY;
DieterGraef 0:f9b6112278fe 123 rt_dispatch (NULL);
DieterGraef 0:f9b6112278fe 124 }
DieterGraef 0:f9b6112278fe 125
DieterGraef 0:f9b6112278fe 126 p_MCB->cb_type = 0U;
DieterGraef 0:f9b6112278fe 127
DieterGraef 0:f9b6112278fe 128 return (OS_R_OK);
DieterGraef 0:f9b6112278fe 129 }
DieterGraef 0:f9b6112278fe 130 #endif
DieterGraef 0:f9b6112278fe 131
DieterGraef 0:f9b6112278fe 132
DieterGraef 0:f9b6112278fe 133 /*--------------------------- rt_mut_release --------------------------------*/
DieterGraef 0:f9b6112278fe 134
DieterGraef 0:f9b6112278fe 135 OS_RESULT rt_mut_release (OS_ID mutex) {
DieterGraef 0:f9b6112278fe 136 /* Release a mutex object */
DieterGraef 0:f9b6112278fe 137 P_MUCB p_MCB = mutex;
DieterGraef 0:f9b6112278fe 138 P_TCB p_TCB;
DieterGraef 0:f9b6112278fe 139 P_MUCB p_mlnk;
DieterGraef 0:f9b6112278fe 140 U8 prio;
DieterGraef 0:f9b6112278fe 141
DieterGraef 0:f9b6112278fe 142 if ((p_MCB->level == 0U) || (p_MCB->owner != os_tsk.run)) {
DieterGraef 0:f9b6112278fe 143 /* Unbalanced mutex release or task is not the owner */
DieterGraef 0:f9b6112278fe 144 return (OS_R_NOK);
DieterGraef 0:f9b6112278fe 145 }
DieterGraef 0:f9b6112278fe 146 if (--p_MCB->level != 0U) {
DieterGraef 0:f9b6112278fe 147 return (OS_R_OK);
DieterGraef 0:f9b6112278fe 148 }
DieterGraef 0:f9b6112278fe 149
DieterGraef 0:f9b6112278fe 150 /* Remove mutex from task mutex owner list. */
DieterGraef 0:f9b6112278fe 151 p_mlnk = os_tsk.run->p_mlnk;
DieterGraef 0:f9b6112278fe 152 if (p_mlnk == p_MCB) {
DieterGraef 0:f9b6112278fe 153 os_tsk.run->p_mlnk = p_MCB->p_mlnk;
DieterGraef 0:f9b6112278fe 154 }
DieterGraef 0:f9b6112278fe 155 else {
DieterGraef 0:f9b6112278fe 156 while (p_mlnk) {
DieterGraef 0:f9b6112278fe 157 if (p_mlnk->p_mlnk == p_MCB) {
DieterGraef 0:f9b6112278fe 158 p_mlnk->p_mlnk = p_MCB->p_mlnk;
DieterGraef 0:f9b6112278fe 159 break;
DieterGraef 0:f9b6112278fe 160 }
DieterGraef 0:f9b6112278fe 161 p_mlnk = p_mlnk->p_mlnk;
DieterGraef 0:f9b6112278fe 162 }
DieterGraef 0:f9b6112278fe 163 }
DieterGraef 0:f9b6112278fe 164
DieterGraef 0:f9b6112278fe 165 /* Restore owner task's priority. */
DieterGraef 0:f9b6112278fe 166 prio = os_tsk.run->prio_base;
DieterGraef 0:f9b6112278fe 167 p_mlnk = os_tsk.run->p_mlnk;
DieterGraef 0:f9b6112278fe 168 while (p_mlnk) {
DieterGraef 0:f9b6112278fe 169 if ((p_mlnk->p_lnk != NULL) && (p_mlnk->p_lnk->prio > prio)) {
DieterGraef 0:f9b6112278fe 170 /* A task with higher priority is waiting for mutex. */
DieterGraef 0:f9b6112278fe 171 prio = p_mlnk->p_lnk->prio;
DieterGraef 0:f9b6112278fe 172 }
DieterGraef 0:f9b6112278fe 173 p_mlnk = p_mlnk->p_mlnk;
DieterGraef 0:f9b6112278fe 174 }
DieterGraef 0:f9b6112278fe 175 os_tsk.run->prio = prio;
DieterGraef 0:f9b6112278fe 176
DieterGraef 0:f9b6112278fe 177 if (p_MCB->p_lnk != NULL) {
DieterGraef 0:f9b6112278fe 178 /* A task is waiting for mutex. */
DieterGraef 0:f9b6112278fe 179 p_TCB = rt_get_first ((P_XCB)p_MCB);
DieterGraef 0:f9b6112278fe 180 #ifdef __CMSIS_RTOS
DieterGraef 0:f9b6112278fe 181 rt_ret_val(p_TCB, 0U/*osOK*/);
DieterGraef 0:f9b6112278fe 182 #else
DieterGraef 0:f9b6112278fe 183 rt_ret_val(p_TCB, OS_R_MUT);
DieterGraef 0:f9b6112278fe 184 #endif
DieterGraef 0:f9b6112278fe 185 rt_rmv_dly (p_TCB);
DieterGraef 0:f9b6112278fe 186 /* A waiting task becomes the owner of this mutex. */
DieterGraef 0:f9b6112278fe 187 p_MCB->level = 1U;
DieterGraef 0:f9b6112278fe 188 p_MCB->owner = p_TCB;
DieterGraef 0:f9b6112278fe 189 p_MCB->p_mlnk = p_TCB->p_mlnk;
DieterGraef 0:f9b6112278fe 190 p_TCB->p_mlnk = p_MCB;
DieterGraef 0:f9b6112278fe 191 /* Priority inversion, check which task continues. */
DieterGraef 0:f9b6112278fe 192 if (os_tsk.run->prio >= rt_rdy_prio()) {
DieterGraef 0:f9b6112278fe 193 rt_dispatch (p_TCB);
DieterGraef 0:f9b6112278fe 194 }
DieterGraef 0:f9b6112278fe 195 else {
DieterGraef 0:f9b6112278fe 196 /* Ready task has higher priority than running task. */
DieterGraef 0:f9b6112278fe 197 rt_put_prio (&os_rdy, os_tsk.run);
DieterGraef 0:f9b6112278fe 198 rt_put_prio (&os_rdy, p_TCB);
DieterGraef 0:f9b6112278fe 199 os_tsk.run->state = READY;
DieterGraef 0:f9b6112278fe 200 p_TCB->state = READY;
DieterGraef 0:f9b6112278fe 201 rt_dispatch (NULL);
DieterGraef 0:f9b6112278fe 202 }
DieterGraef 0:f9b6112278fe 203 }
DieterGraef 0:f9b6112278fe 204 else {
DieterGraef 0:f9b6112278fe 205 /* Check if own priority lowered by priority inversion. */
DieterGraef 0:f9b6112278fe 206 if (rt_rdy_prio() > os_tsk.run->prio) {
DieterGraef 0:f9b6112278fe 207 rt_put_prio (&os_rdy, os_tsk.run);
DieterGraef 0:f9b6112278fe 208 os_tsk.run->state = READY;
DieterGraef 0:f9b6112278fe 209 rt_dispatch (NULL);
DieterGraef 0:f9b6112278fe 210 }
DieterGraef 0:f9b6112278fe 211 }
DieterGraef 0:f9b6112278fe 212 return (OS_R_OK);
DieterGraef 0:f9b6112278fe 213 }
DieterGraef 0:f9b6112278fe 214
DieterGraef 0:f9b6112278fe 215
DieterGraef 0:f9b6112278fe 216 /*--------------------------- rt_mut_wait -----------------------------------*/
DieterGraef 0:f9b6112278fe 217
DieterGraef 0:f9b6112278fe 218 OS_RESULT rt_mut_wait (OS_ID mutex, U16 timeout) {
DieterGraef 0:f9b6112278fe 219 /* Wait for a mutex, continue when mutex is free. */
DieterGraef 0:f9b6112278fe 220 P_MUCB p_MCB = mutex;
DieterGraef 0:f9b6112278fe 221
DieterGraef 0:f9b6112278fe 222 if (p_MCB->level == 0U) {
DieterGraef 0:f9b6112278fe 223 p_MCB->owner = os_tsk.run;
DieterGraef 0:f9b6112278fe 224 p_MCB->p_mlnk = os_tsk.run->p_mlnk;
DieterGraef 0:f9b6112278fe 225 os_tsk.run->p_mlnk = p_MCB;
DieterGraef 0:f9b6112278fe 226 goto inc;
DieterGraef 0:f9b6112278fe 227 }
DieterGraef 0:f9b6112278fe 228 if (p_MCB->owner == os_tsk.run) {
DieterGraef 0:f9b6112278fe 229 /* OK, running task is the owner of this mutex. */
DieterGraef 0:f9b6112278fe 230 inc:p_MCB->level++;
DieterGraef 0:f9b6112278fe 231 return (OS_R_OK);
DieterGraef 0:f9b6112278fe 232 }
DieterGraef 0:f9b6112278fe 233 /* Mutex owned by another task, wait until released. */
DieterGraef 0:f9b6112278fe 234 if (timeout == 0U) {
DieterGraef 0:f9b6112278fe 235 return (OS_R_TMO);
DieterGraef 0:f9b6112278fe 236 }
DieterGraef 0:f9b6112278fe 237 /* Raise the owner task priority if lower than current priority. */
DieterGraef 0:f9b6112278fe 238 /* This priority inversion is called priority inheritance. */
DieterGraef 0:f9b6112278fe 239 if (p_MCB->owner->prio < os_tsk.run->prio) {
DieterGraef 0:f9b6112278fe 240 p_MCB->owner->prio = os_tsk.run->prio;
DieterGraef 0:f9b6112278fe 241 rt_resort_prio (p_MCB->owner);
DieterGraef 0:f9b6112278fe 242 }
DieterGraef 0:f9b6112278fe 243 if (p_MCB->p_lnk != NULL) {
DieterGraef 0:f9b6112278fe 244 rt_put_prio ((P_XCB)p_MCB, os_tsk.run);
DieterGraef 0:f9b6112278fe 245 }
DieterGraef 0:f9b6112278fe 246 else {
DieterGraef 0:f9b6112278fe 247 p_MCB->p_lnk = os_tsk.run;
DieterGraef 0:f9b6112278fe 248 os_tsk.run->p_lnk = NULL;
DieterGraef 0:f9b6112278fe 249 os_tsk.run->p_rlnk = (P_TCB)p_MCB;
DieterGraef 0:f9b6112278fe 250 }
DieterGraef 0:f9b6112278fe 251 rt_block(timeout, WAIT_MUT);
DieterGraef 0:f9b6112278fe 252 return (OS_R_TMO);
DieterGraef 0:f9b6112278fe 253 }
DieterGraef 0:f9b6112278fe 254
DieterGraef 0:f9b6112278fe 255
DieterGraef 0:f9b6112278fe 256 /*----------------------------------------------------------------------------
DieterGraef 0:f9b6112278fe 257 * end of file
DieterGraef 0:f9b6112278fe 258 *---------------------------------------------------------------------------*/
DieterGraef 0:f9b6112278fe 259