Austin Blackstone / Mbed 2 deprecated client-lwip-lightswitch-demo-expanded

mbed client lightswitch demo

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of mbed-client-classic-example-lwip by Austin Blackstone

mbed-rtos/rtx/TARGET_ARM7/rt_Mutex.c@11:cada08fc8a70, 2016-06-09 (annotated)

Committer:
mbedAustin
Date:
Thu Jun 09 17:08:36 2016 +0000
Revision:
11:cada08fc8a70
Commit for public Consumption

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbedAustin 11:cada08fc8a70 1 /*----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 2 * RL-ARM - RTX
mbedAustin 11:cada08fc8a70 3 *----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 4 * Name: RT_MUTEX.C
mbedAustin 11:cada08fc8a70 5 * Purpose: Implements mutex synchronization objects
mbedAustin 11:cada08fc8a70 6 * Rev.: V4.60
mbedAustin 11:cada08fc8a70 7 *----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 8 *
mbedAustin 11:cada08fc8a70 9 * Copyright (c) 1999-2009 KEIL, 2009-2015 ARM Germany GmbH
mbedAustin 11:cada08fc8a70 10 * All rights reserved.
mbedAustin 11:cada08fc8a70 11 * Redistribution and use in source and binary forms, with or without
mbedAustin 11:cada08fc8a70 12 * modification, are permitted provided that the following conditions are met:
mbedAustin 11:cada08fc8a70 13 * - Redistributions of source code must retain the above copyright
mbedAustin 11:cada08fc8a70 14 * notice, this list of conditions and the following disclaimer.
mbedAustin 11:cada08fc8a70 15 * - Redistributions in binary form must reproduce the above copyright
mbedAustin 11:cada08fc8a70 16 * notice, this list of conditions and the following disclaimer in the
mbedAustin 11:cada08fc8a70 17 * documentation and/or other materials provided with the distribution.
mbedAustin 11:cada08fc8a70 18 * - Neither the name of ARM nor the names of its contributors may be used
mbedAustin 11:cada08fc8a70 19 * to endorse or promote products derived from this software without
mbedAustin 11:cada08fc8a70 20 * specific prior written permission.
mbedAustin 11:cada08fc8a70 21 *
mbedAustin 11:cada08fc8a70 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbedAustin 11:cada08fc8a70 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbedAustin 11:cada08fc8a70 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
mbedAustin 11:cada08fc8a70 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
mbedAustin 11:cada08fc8a70 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
mbedAustin 11:cada08fc8a70 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
mbedAustin 11:cada08fc8a70 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbedAustin 11:cada08fc8a70 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbedAustin 11:cada08fc8a70 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
mbedAustin 11:cada08fc8a70 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
mbedAustin 11:cada08fc8a70 32 * POSSIBILITY OF SUCH DAMAGE.
mbedAustin 11:cada08fc8a70 33 *---------------------------------------------------------------------------*/
mbedAustin 11:cada08fc8a70 34
mbedAustin 11:cada08fc8a70 35 #include "rt_TypeDef.h"
mbedAustin 11:cada08fc8a70 36 #include "RTX_Conf.h"
mbedAustin 11:cada08fc8a70 37 #include "rt_List.h"
mbedAustin 11:cada08fc8a70 38 #include "rt_Task.h"
mbedAustin 11:cada08fc8a70 39 #include "rt_Mutex.h"
mbedAustin 11:cada08fc8a70 40 #include "rt_HAL_CM.h"
mbedAustin 11:cada08fc8a70 41
mbedAustin 11:cada08fc8a70 42
mbedAustin 11:cada08fc8a70 43 /*----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 44 * Functions
mbedAustin 11:cada08fc8a70 45 *---------------------------------------------------------------------------*/
mbedAustin 11:cada08fc8a70 46
mbedAustin 11:cada08fc8a70 47
mbedAustin 11:cada08fc8a70 48 /*--------------------------- rt_mut_init -----------------------------------*/
mbedAustin 11:cada08fc8a70 49
mbedAustin 11:cada08fc8a70 50 void rt_mut_init (OS_ID mutex) {
mbedAustin 11:cada08fc8a70 51 /* Initialize a mutex object */
mbedAustin 11:cada08fc8a70 52 P_MUCB p_MCB = mutex;
mbedAustin 11:cada08fc8a70 53
mbedAustin 11:cada08fc8a70 54 p_MCB->cb_type = MUCB;
mbedAustin 11:cada08fc8a70 55 p_MCB->prio = 0;
mbedAustin 11:cada08fc8a70 56 p_MCB->level = 0;
mbedAustin 11:cada08fc8a70 57 p_MCB->p_lnk = NULL;
mbedAustin 11:cada08fc8a70 58 p_MCB->owner = NULL;
mbedAustin 11:cada08fc8a70 59 }
mbedAustin 11:cada08fc8a70 60
mbedAustin 11:cada08fc8a70 61
mbedAustin 11:cada08fc8a70 62 /*--------------------------- rt_mut_delete ---------------------------------*/
mbedAustin 11:cada08fc8a70 63
mbedAustin 11:cada08fc8a70 64 #ifdef __CMSIS_RTOS
mbedAustin 11:cada08fc8a70 65 OS_RESULT rt_mut_delete (OS_ID mutex) {
mbedAustin 11:cada08fc8a70 66 /* Delete a mutex object */
mbedAustin 11:cada08fc8a70 67 P_MUCB p_MCB = mutex;
mbedAustin 11:cada08fc8a70 68 P_TCB p_TCB;
mbedAustin 11:cada08fc8a70 69
mbedAustin 11:cada08fc8a70 70 /* Restore owner task's priority. */
mbedAustin 11:cada08fc8a70 71 if (p_MCB->level != 0) {
mbedAustin 11:cada08fc8a70 72 p_MCB->owner->prio = p_MCB->prio;
mbedAustin 11:cada08fc8a70 73 if (p_MCB->owner != os_tsk.run) {
mbedAustin 11:cada08fc8a70 74 rt_resort_prio (p_MCB->owner);
mbedAustin 11:cada08fc8a70 75 }
mbedAustin 11:cada08fc8a70 76 }
mbedAustin 11:cada08fc8a70 77
mbedAustin 11:cada08fc8a70 78 while (p_MCB->p_lnk != NULL) {
mbedAustin 11:cada08fc8a70 79 /* A task is waiting for mutex. */
mbedAustin 11:cada08fc8a70 80 p_TCB = rt_get_first ((P_XCB)p_MCB);
mbedAustin 11:cada08fc8a70 81 rt_ret_val(p_TCB, 0/*osOK*/);
mbedAustin 11:cada08fc8a70 82 rt_rmv_dly(p_TCB);
mbedAustin 11:cada08fc8a70 83 p_TCB->state = READY;
mbedAustin 11:cada08fc8a70 84 rt_put_prio (&os_rdy, p_TCB);
mbedAustin 11:cada08fc8a70 85 }
mbedAustin 11:cada08fc8a70 86
mbedAustin 11:cada08fc8a70 87 if (os_rdy.p_lnk && (os_rdy.p_lnk->prio > os_tsk.run->prio)) {
mbedAustin 11:cada08fc8a70 88 /* preempt running task */
mbedAustin 11:cada08fc8a70 89 rt_put_prio (&os_rdy, os_tsk.run);
mbedAustin 11:cada08fc8a70 90 os_tsk.run->state = READY;
mbedAustin 11:cada08fc8a70 91 rt_dispatch (NULL);
mbedAustin 11:cada08fc8a70 92 }
mbedAustin 11:cada08fc8a70 93
mbedAustin 11:cada08fc8a70 94 p_MCB->cb_type = 0;
mbedAustin 11:cada08fc8a70 95
mbedAustin 11:cada08fc8a70 96 return (OS_R_OK);
mbedAustin 11:cada08fc8a70 97 }
mbedAustin 11:cada08fc8a70 98 #endif
mbedAustin 11:cada08fc8a70 99
mbedAustin 11:cada08fc8a70 100
mbedAustin 11:cada08fc8a70 101 /*--------------------------- rt_mut_release --------------------------------*/
mbedAustin 11:cada08fc8a70 102
mbedAustin 11:cada08fc8a70 103 OS_RESULT rt_mut_release (OS_ID mutex) {
mbedAustin 11:cada08fc8a70 104 /* Release a mutex object */
mbedAustin 11:cada08fc8a70 105 P_MUCB p_MCB = mutex;
mbedAustin 11:cada08fc8a70 106 P_TCB p_TCB;
mbedAustin 11:cada08fc8a70 107
mbedAustin 11:cada08fc8a70 108 if (p_MCB->level == 0 || p_MCB->owner != os_tsk.run) {
mbedAustin 11:cada08fc8a70 109 /* Unbalanced mutex release or task is not the owner */
mbedAustin 11:cada08fc8a70 110 return (OS_R_NOK);
mbedAustin 11:cada08fc8a70 111 }
mbedAustin 11:cada08fc8a70 112 if (--p_MCB->level != 0) {
mbedAustin 11:cada08fc8a70 113 return (OS_R_OK);
mbedAustin 11:cada08fc8a70 114 }
mbedAustin 11:cada08fc8a70 115 /* Restore owner task's priority. */
mbedAustin 11:cada08fc8a70 116 os_tsk.run->prio = p_MCB->prio;
mbedAustin 11:cada08fc8a70 117 if (p_MCB->p_lnk != NULL) {
mbedAustin 11:cada08fc8a70 118 /* A task is waiting for mutex. */
mbedAustin 11:cada08fc8a70 119 p_TCB = rt_get_first ((P_XCB)p_MCB);
mbedAustin 11:cada08fc8a70 120 #ifdef __CMSIS_RTOS
mbedAustin 11:cada08fc8a70 121 rt_ret_val(p_TCB, 0/*osOK*/);
mbedAustin 11:cada08fc8a70 122 #else
mbedAustin 11:cada08fc8a70 123 rt_ret_val(p_TCB, OS_R_MUT);
mbedAustin 11:cada08fc8a70 124 #endif
mbedAustin 11:cada08fc8a70 125 rt_rmv_dly (p_TCB);
mbedAustin 11:cada08fc8a70 126 /* A waiting task becomes the owner of this mutex. */
mbedAustin 11:cada08fc8a70 127 p_MCB->level = 1;
mbedAustin 11:cada08fc8a70 128 p_MCB->owner = p_TCB;
mbedAustin 11:cada08fc8a70 129 p_MCB->prio = p_TCB->prio;
mbedAustin 11:cada08fc8a70 130 /* Priority inversion, check which task continues. */
mbedAustin 11:cada08fc8a70 131 if (os_tsk.run->prio >= rt_rdy_prio()) {
mbedAustin 11:cada08fc8a70 132 rt_dispatch (p_TCB);
mbedAustin 11:cada08fc8a70 133 }
mbedAustin 11:cada08fc8a70 134 else {
mbedAustin 11:cada08fc8a70 135 /* Ready task has higher priority than running task. */
mbedAustin 11:cada08fc8a70 136 rt_put_prio (&os_rdy, os_tsk.run);
mbedAustin 11:cada08fc8a70 137 rt_put_prio (&os_rdy, p_TCB);
mbedAustin 11:cada08fc8a70 138 os_tsk.run->state = READY;
mbedAustin 11:cada08fc8a70 139 p_TCB->state = READY;
mbedAustin 11:cada08fc8a70 140 rt_dispatch (NULL);
mbedAustin 11:cada08fc8a70 141 }
mbedAustin 11:cada08fc8a70 142 }
mbedAustin 11:cada08fc8a70 143 else {
mbedAustin 11:cada08fc8a70 144 /* Check if own priority raised by priority inversion. */
mbedAustin 11:cada08fc8a70 145 if (rt_rdy_prio() > os_tsk.run->prio) {
mbedAustin 11:cada08fc8a70 146 rt_put_prio (&os_rdy, os_tsk.run);
mbedAustin 11:cada08fc8a70 147 os_tsk.run->state = READY;
mbedAustin 11:cada08fc8a70 148 rt_dispatch (NULL);
mbedAustin 11:cada08fc8a70 149 }
mbedAustin 11:cada08fc8a70 150 }
mbedAustin 11:cada08fc8a70 151 return (OS_R_OK);
mbedAustin 11:cada08fc8a70 152 }
mbedAustin 11:cada08fc8a70 153
mbedAustin 11:cada08fc8a70 154
mbedAustin 11:cada08fc8a70 155 /*--------------------------- rt_mut_wait -----------------------------------*/
mbedAustin 11:cada08fc8a70 156
mbedAustin 11:cada08fc8a70 157 OS_RESULT rt_mut_wait (OS_ID mutex, U16 timeout) {
mbedAustin 11:cada08fc8a70 158 /* Wait for a mutex, continue when mutex is free. */
mbedAustin 11:cada08fc8a70 159 P_MUCB p_MCB = mutex;
mbedAustin 11:cada08fc8a70 160
mbedAustin 11:cada08fc8a70 161 if (p_MCB->level == 0) {
mbedAustin 11:cada08fc8a70 162 p_MCB->owner = os_tsk.run;
mbedAustin 11:cada08fc8a70 163 p_MCB->prio = os_tsk.run->prio;
mbedAustin 11:cada08fc8a70 164 goto inc;
mbedAustin 11:cada08fc8a70 165 }
mbedAustin 11:cada08fc8a70 166 if (p_MCB->owner == os_tsk.run) {
mbedAustin 11:cada08fc8a70 167 /* OK, running task is the owner of this mutex. */
mbedAustin 11:cada08fc8a70 168 inc:p_MCB->level++;
mbedAustin 11:cada08fc8a70 169 return (OS_R_OK);
mbedAustin 11:cada08fc8a70 170 }
mbedAustin 11:cada08fc8a70 171 /* Mutex owned by another task, wait until released. */
mbedAustin 11:cada08fc8a70 172 if (timeout == 0) {
mbedAustin 11:cada08fc8a70 173 return (OS_R_TMO);
mbedAustin 11:cada08fc8a70 174 }
mbedAustin 11:cada08fc8a70 175 /* Raise the owner task priority if lower than current priority. */
mbedAustin 11:cada08fc8a70 176 /* This priority inversion is called priority inheritance. */
mbedAustin 11:cada08fc8a70 177 if (p_MCB->prio < os_tsk.run->prio) {
mbedAustin 11:cada08fc8a70 178 p_MCB->owner->prio = os_tsk.run->prio;
mbedAustin 11:cada08fc8a70 179 rt_resort_prio (p_MCB->owner);
mbedAustin 11:cada08fc8a70 180 }
mbedAustin 11:cada08fc8a70 181 if (p_MCB->p_lnk != NULL) {
mbedAustin 11:cada08fc8a70 182 rt_put_prio ((P_XCB)p_MCB, os_tsk.run);
mbedAustin 11:cada08fc8a70 183 }
mbedAustin 11:cada08fc8a70 184 else {
mbedAustin 11:cada08fc8a70 185 p_MCB->p_lnk = os_tsk.run;
mbedAustin 11:cada08fc8a70 186 os_tsk.run->p_lnk = NULL;
mbedAustin 11:cada08fc8a70 187 os_tsk.run->p_rlnk = (P_TCB)p_MCB;
mbedAustin 11:cada08fc8a70 188 }
mbedAustin 11:cada08fc8a70 189 rt_block(timeout, WAIT_MUT);
mbedAustin 11:cada08fc8a70 190 return (OS_R_TMO);
mbedAustin 11:cada08fc8a70 191 }
mbedAustin 11:cada08fc8a70 192
mbedAustin 11:cada08fc8a70 193
mbedAustin 11:cada08fc8a70 194 /*----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 195 * end of file
mbedAustin 11:cada08fc8a70 196 *---------------------------------------------------------------------------*/
mbedAustin 11:cada08fc8a70 197