Freeman Oldman / NUCLEO_STM32F401RE_CC3000_ILI9341

The code from https://github.com/vpcola/Nucleo

mbed-rtos/rtx/rt_Mutex.c@0:5464d5e415e5, 2014-10-08 (annotated)

Committer:
sinrab
Date:
Wed Oct 08 11:00:24 2014 +0000
Revision:
0:5464d5e415e5
The code from https://github.com/vpcola/Nucleo

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sinrab 0:5464d5e415e5 1 /*----------------------------------------------------------------------------
sinrab 0:5464d5e415e5 2 * RL-ARM - RTX
sinrab 0:5464d5e415e5 3 *----------------------------------------------------------------------------
sinrab 0:5464d5e415e5 4 * Name: RT_MUTEX.C
sinrab 0:5464d5e415e5 5 * Purpose: Implements mutex synchronization objects
sinrab 0:5464d5e415e5 6 * Rev.: V4.60
sinrab 0:5464d5e415e5 7 *----------------------------------------------------------------------------
sinrab 0:5464d5e415e5 8 *
sinrab 0:5464d5e415e5 9 * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
sinrab 0:5464d5e415e5 10 * All rights reserved.
sinrab 0:5464d5e415e5 11 * Redistribution and use in source and binary forms, with or without
sinrab 0:5464d5e415e5 12 * modification, are permitted provided that the following conditions are met:
sinrab 0:5464d5e415e5 13 * - Redistributions of source code must retain the above copyright
sinrab 0:5464d5e415e5 14 * notice, this list of conditions and the following disclaimer.
sinrab 0:5464d5e415e5 15 * - Redistributions in binary form must reproduce the above copyright
sinrab 0:5464d5e415e5 16 * notice, this list of conditions and the following disclaimer in the
sinrab 0:5464d5e415e5 17 * documentation and/or other materials provided with the distribution.
sinrab 0:5464d5e415e5 18 * - Neither the name of ARM nor the names of its contributors may be used
sinrab 0:5464d5e415e5 19 * to endorse or promote products derived from this software without
sinrab 0:5464d5e415e5 20 * specific prior written permission.
sinrab 0:5464d5e415e5 21 *
sinrab 0:5464d5e415e5 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
sinrab 0:5464d5e415e5 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sinrab 0:5464d5e415e5 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sinrab 0:5464d5e415e5 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
sinrab 0:5464d5e415e5 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
sinrab 0:5464d5e415e5 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
sinrab 0:5464d5e415e5 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
sinrab 0:5464d5e415e5 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
sinrab 0:5464d5e415e5 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
sinrab 0:5464d5e415e5 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
sinrab 0:5464d5e415e5 32 * POSSIBILITY OF SUCH DAMAGE.
sinrab 0:5464d5e415e5 33 *---------------------------------------------------------------------------*/
sinrab 0:5464d5e415e5 34
sinrab 0:5464d5e415e5 35 #include "rt_TypeDef.h"
sinrab 0:5464d5e415e5 36 #include "RTX_Conf.h"
sinrab 0:5464d5e415e5 37 #include "rt_List.h"
sinrab 0:5464d5e415e5 38 #include "rt_Task.h"
sinrab 0:5464d5e415e5 39 #include "rt_Mutex.h"
sinrab 0:5464d5e415e5 40 #include "rt_HAL_CM.h"
sinrab 0:5464d5e415e5 41
sinrab 0:5464d5e415e5 42
sinrab 0:5464d5e415e5 43 /*----------------------------------------------------------------------------
sinrab 0:5464d5e415e5 44 * Functions
sinrab 0:5464d5e415e5 45 *---------------------------------------------------------------------------*/
sinrab 0:5464d5e415e5 46
sinrab 0:5464d5e415e5 47
sinrab 0:5464d5e415e5 48 /*--------------------------- rt_mut_init -----------------------------------*/
sinrab 0:5464d5e415e5 49
sinrab 0:5464d5e415e5 50 void rt_mut_init (OS_ID mutex) {
sinrab 0:5464d5e415e5 51 /* Initialize a mutex object */
sinrab 0:5464d5e415e5 52 P_MUCB p_MCB = mutex;
sinrab 0:5464d5e415e5 53
sinrab 0:5464d5e415e5 54 p_MCB->cb_type = MUCB;
sinrab 0:5464d5e415e5 55 p_MCB->prio = 0;
sinrab 0:5464d5e415e5 56 p_MCB->level = 0;
sinrab 0:5464d5e415e5 57 p_MCB->p_lnk = NULL;
sinrab 0:5464d5e415e5 58 p_MCB->owner = NULL;
sinrab 0:5464d5e415e5 59 }
sinrab 0:5464d5e415e5 60
sinrab 0:5464d5e415e5 61
sinrab 0:5464d5e415e5 62 /*--------------------------- rt_mut_delete ---------------------------------*/
sinrab 0:5464d5e415e5 63
sinrab 0:5464d5e415e5 64 #ifdef __CMSIS_RTOS
sinrab 0:5464d5e415e5 65 OS_RESULT rt_mut_delete (OS_ID mutex) {
sinrab 0:5464d5e415e5 66 /* Delete a mutex object */
sinrab 0:5464d5e415e5 67 P_MUCB p_MCB = mutex;
sinrab 0:5464d5e415e5 68 P_TCB p_TCB;
sinrab 0:5464d5e415e5 69
sinrab 0:5464d5e415e5 70 /* Restore owner task's priority. */
sinrab 0:5464d5e415e5 71 if (p_MCB->level != 0) {
sinrab 0:5464d5e415e5 72 p_MCB->owner->prio = p_MCB->prio;
sinrab 0:5464d5e415e5 73 if (p_MCB->owner != os_tsk.run) {
sinrab 0:5464d5e415e5 74 rt_resort_prio (p_MCB->owner);
sinrab 0:5464d5e415e5 75 }
sinrab 0:5464d5e415e5 76 }
sinrab 0:5464d5e415e5 77
sinrab 0:5464d5e415e5 78 while (p_MCB->p_lnk != NULL) {
sinrab 0:5464d5e415e5 79 /* A task is waiting for mutex. */
sinrab 0:5464d5e415e5 80 p_TCB = rt_get_first ((P_XCB)p_MCB);
sinrab 0:5464d5e415e5 81 rt_ret_val(p_TCB, 0/*osOK*/);
sinrab 0:5464d5e415e5 82 rt_rmv_dly(p_TCB);
sinrab 0:5464d5e415e5 83 p_TCB->state = READY;
sinrab 0:5464d5e415e5 84 rt_put_prio (&os_rdy, p_TCB);
sinrab 0:5464d5e415e5 85 }
sinrab 0:5464d5e415e5 86
sinrab 0:5464d5e415e5 87 if (os_rdy.p_lnk && (os_rdy.p_lnk->prio > os_tsk.run->prio)) {
sinrab 0:5464d5e415e5 88 /* preempt running task */
sinrab 0:5464d5e415e5 89 rt_put_prio (&os_rdy, os_tsk.run);
sinrab 0:5464d5e415e5 90 os_tsk.run->state = READY;
sinrab 0:5464d5e415e5 91 rt_dispatch (NULL);
sinrab 0:5464d5e415e5 92 }
sinrab 0:5464d5e415e5 93
sinrab 0:5464d5e415e5 94 p_MCB->cb_type = 0;
sinrab 0:5464d5e415e5 95
sinrab 0:5464d5e415e5 96 return (OS_R_OK);
sinrab 0:5464d5e415e5 97 }
sinrab 0:5464d5e415e5 98 #endif
sinrab 0:5464d5e415e5 99
sinrab 0:5464d5e415e5 100
sinrab 0:5464d5e415e5 101 /*--------------------------- rt_mut_release --------------------------------*/
sinrab 0:5464d5e415e5 102
sinrab 0:5464d5e415e5 103 OS_RESULT rt_mut_release (OS_ID mutex) {
sinrab 0:5464d5e415e5 104 /* Release a mutex object */
sinrab 0:5464d5e415e5 105 P_MUCB p_MCB = mutex;
sinrab 0:5464d5e415e5 106 P_TCB p_TCB;
sinrab 0:5464d5e415e5 107
sinrab 0:5464d5e415e5 108 if (p_MCB->level == 0 || p_MCB->owner != os_tsk.run) {
sinrab 0:5464d5e415e5 109 /* Unbalanced mutex release or task is not the owner */
sinrab 0:5464d5e415e5 110 return (OS_R_NOK);
sinrab 0:5464d5e415e5 111 }
sinrab 0:5464d5e415e5 112 if (--p_MCB->level != 0) {
sinrab 0:5464d5e415e5 113 return (OS_R_OK);
sinrab 0:5464d5e415e5 114 }
sinrab 0:5464d5e415e5 115 /* Restore owner task's priority. */
sinrab 0:5464d5e415e5 116 os_tsk.run->prio = p_MCB->prio;
sinrab 0:5464d5e415e5 117 if (p_MCB->p_lnk != NULL) {
sinrab 0:5464d5e415e5 118 /* A task is waiting for mutex. */
sinrab 0:5464d5e415e5 119 p_TCB = rt_get_first ((P_XCB)p_MCB);
sinrab 0:5464d5e415e5 120 #ifdef __CMSIS_RTOS
sinrab 0:5464d5e415e5 121 rt_ret_val(p_TCB, 0/*osOK*/);
sinrab 0:5464d5e415e5 122 #else
sinrab 0:5464d5e415e5 123 rt_ret_val(p_TCB, OS_R_MUT);
sinrab 0:5464d5e415e5 124 #endif
sinrab 0:5464d5e415e5 125 rt_rmv_dly (p_TCB);
sinrab 0:5464d5e415e5 126 /* A waiting task becomes the owner of this mutex. */
sinrab 0:5464d5e415e5 127 p_MCB->level = 1;
sinrab 0:5464d5e415e5 128 p_MCB->owner = p_TCB;
sinrab 0:5464d5e415e5 129 p_MCB->prio = p_TCB->prio;
sinrab 0:5464d5e415e5 130 /* Priority inversion, check which task continues. */
sinrab 0:5464d5e415e5 131 if (os_tsk.run->prio >= rt_rdy_prio()) {
sinrab 0:5464d5e415e5 132 rt_dispatch (p_TCB);
sinrab 0:5464d5e415e5 133 }
sinrab 0:5464d5e415e5 134 else {
sinrab 0:5464d5e415e5 135 /* Ready task has higher priority than running task. */
sinrab 0:5464d5e415e5 136 rt_put_prio (&os_rdy, os_tsk.run);
sinrab 0:5464d5e415e5 137 rt_put_prio (&os_rdy, p_TCB);
sinrab 0:5464d5e415e5 138 os_tsk.run->state = READY;
sinrab 0:5464d5e415e5 139 p_TCB->state = READY;
sinrab 0:5464d5e415e5 140 rt_dispatch (NULL);
sinrab 0:5464d5e415e5 141 }
sinrab 0:5464d5e415e5 142 }
sinrab 0:5464d5e415e5 143 else {
sinrab 0:5464d5e415e5 144 /* Check if own priority raised by priority inversion. */
sinrab 0:5464d5e415e5 145 if (rt_rdy_prio() > os_tsk.run->prio) {
sinrab 0:5464d5e415e5 146 rt_put_prio (&os_rdy, os_tsk.run);
sinrab 0:5464d5e415e5 147 os_tsk.run->state = READY;
sinrab 0:5464d5e415e5 148 rt_dispatch (NULL);
sinrab 0:5464d5e415e5 149 }
sinrab 0:5464d5e415e5 150 }
sinrab 0:5464d5e415e5 151 return (OS_R_OK);
sinrab 0:5464d5e415e5 152 }
sinrab 0:5464d5e415e5 153
sinrab 0:5464d5e415e5 154
sinrab 0:5464d5e415e5 155 /*--------------------------- rt_mut_wait -----------------------------------*/
sinrab 0:5464d5e415e5 156
sinrab 0:5464d5e415e5 157 OS_RESULT rt_mut_wait (OS_ID mutex, U16 timeout) {
sinrab 0:5464d5e415e5 158 /* Wait for a mutex, continue when mutex is free. */
sinrab 0:5464d5e415e5 159 P_MUCB p_MCB = mutex;
sinrab 0:5464d5e415e5 160
sinrab 0:5464d5e415e5 161 if (p_MCB->level == 0) {
sinrab 0:5464d5e415e5 162 p_MCB->owner = os_tsk.run;
sinrab 0:5464d5e415e5 163 p_MCB->prio = os_tsk.run->prio;
sinrab 0:5464d5e415e5 164 goto inc;
sinrab 0:5464d5e415e5 165 }
sinrab 0:5464d5e415e5 166 if (p_MCB->owner == os_tsk.run) {
sinrab 0:5464d5e415e5 167 /* OK, running task is the owner of this mutex. */
sinrab 0:5464d5e415e5 168 inc:p_MCB->level++;
sinrab 0:5464d5e415e5 169 return (OS_R_OK);
sinrab 0:5464d5e415e5 170 }
sinrab 0:5464d5e415e5 171 /* Mutex owned by another task, wait until released. */
sinrab 0:5464d5e415e5 172 if (timeout == 0) {
sinrab 0:5464d5e415e5 173 return (OS_R_TMO);
sinrab 0:5464d5e415e5 174 }
sinrab 0:5464d5e415e5 175 /* Raise the owner task priority if lower than current priority. */
sinrab 0:5464d5e415e5 176 /* This priority inversion is called priority inheritance. */
sinrab 0:5464d5e415e5 177 if (p_MCB->prio < os_tsk.run->prio) {
sinrab 0:5464d5e415e5 178 p_MCB->owner->prio = os_tsk.run->prio;
sinrab 0:5464d5e415e5 179 rt_resort_prio (p_MCB->owner);
sinrab 0:5464d5e415e5 180 }
sinrab 0:5464d5e415e5 181 if (p_MCB->p_lnk != NULL) {
sinrab 0:5464d5e415e5 182 rt_put_prio ((P_XCB)p_MCB, os_tsk.run);
sinrab 0:5464d5e415e5 183 }
sinrab 0:5464d5e415e5 184 else {
sinrab 0:5464d5e415e5 185 p_MCB->p_lnk = os_tsk.run;
sinrab 0:5464d5e415e5 186 os_tsk.run->p_lnk = NULL;
sinrab 0:5464d5e415e5 187 os_tsk.run->p_rlnk = (P_TCB)p_MCB;
sinrab 0:5464d5e415e5 188 }
sinrab 0:5464d5e415e5 189 rt_block(timeout, WAIT_MUT);
sinrab 0:5464d5e415e5 190 return (OS_R_TMO);
sinrab 0:5464d5e415e5 191 }
sinrab 0:5464d5e415e5 192
sinrab 0:5464d5e415e5 193
sinrab 0:5464d5e415e5 194 /*----------------------------------------------------------------------------
sinrab 0:5464d5e415e5 195 * end of file
sinrab 0:5464d5e415e5 196 *---------------------------------------------------------------------------*/
sinrab 0:5464d5e415e5 197
sinrab 0:5464d5e415e5 198