SparkFun Electronics / mbed-rtos

Fork of the mbed-rtos library by mbed.

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Fork of mbed-rtos by mbed official

rtx/TARGET_CORTEX_M/rt_Mutex.c@92:bc9729798a19, 2015-09-25 (annotated)

Committer:
mbed_official
Date:
Fri Sep 25 13:30:34 2015 +0100
Revision:
92:bc9729798a19
Parent:
49:77c8e4604045 
Synchronized with git revision e8c24ba90dd5507bdb7c1b46dd3aba8cfabb762b



Full URL: https://github.com/mbedmicro/mbed/commit/e8c24ba90dd5507bdb7c1b46dd3aba8cfabb762b/



RZ_A1H - Modify to support NEON for RTOS.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 49:77c8e4604045 1 /*----------------------------------------------------------------------------
mbed_official 49:77c8e4604045 2 * RL-ARM - 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 49:77c8e4604045 6 * Rev.: V4.60
mbed_official 49:77c8e4604045 7 *----------------------------------------------------------------------------
mbed_official 49:77c8e4604045 8 *
mbed_official 49:77c8e4604045 9 * Copyright (c) 1999-2009 KEIL, 2009-2012 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 49:77c8e4604045 36 #include "RTX_Conf.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 49:77c8e4604045 55 p_MCB->prio = 0;
mbed_official 49:77c8e4604045 56 p_MCB->level = 0;
mbed_official 49:77c8e4604045 57 p_MCB->p_lnk = NULL;
mbed_official 49:77c8e4604045 58 p_MCB->owner = 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 49:77c8e4604045 69
mbed_official 49:77c8e4604045 70 /* Restore owner task's priority. */
mbed_official 49:77c8e4604045 71 if (p_MCB->level != 0) {
mbed_official 49:77c8e4604045 72 p_MCB->owner->prio = p_MCB->prio;
mbed_official 49:77c8e4604045 73 if (p_MCB->owner != os_tsk.run) {
mbed_official 49:77c8e4604045 74 rt_resort_prio (p_MCB->owner);
mbed_official 49:77c8e4604045 75 }
mbed_official 49:77c8e4604045 76 }
mbed_official 49:77c8e4604045 77
mbed_official 49:77c8e4604045 78 while (p_MCB->p_lnk != NULL) {
mbed_official 49:77c8e4604045 79 /* A task is waiting for mutex. */
mbed_official 49:77c8e4604045 80 p_TCB = rt_get_first ((P_XCB)p_MCB);
mbed_official 49:77c8e4604045 81 rt_ret_val(p_TCB, 0/*osOK*/);
mbed_official 49:77c8e4604045 82 rt_rmv_dly(p_TCB);
mbed_official 49:77c8e4604045 83 p_TCB->state = READY;
mbed_official 49:77c8e4604045 84 rt_put_prio (&os_rdy, p_TCB);
mbed_official 49:77c8e4604045 85 }
mbed_official 49:77c8e4604045 86
mbed_official 49:77c8e4604045 87 if (os_rdy.p_lnk && (os_rdy.p_lnk->prio > os_tsk.run->prio)) {
mbed_official 49:77c8e4604045 88 /* preempt running task */
mbed_official 49:77c8e4604045 89 rt_put_prio (&os_rdy, os_tsk.run);
mbed_official 49:77c8e4604045 90 os_tsk.run->state = READY;
mbed_official 49:77c8e4604045 91 rt_dispatch (NULL);
mbed_official 49:77c8e4604045 92 }
mbed_official 49:77c8e4604045 93
mbed_official 49:77c8e4604045 94 p_MCB->cb_type = 0;
mbed_official 49:77c8e4604045 95
mbed_official 49:77c8e4604045 96 return (OS_R_OK);
mbed_official 49:77c8e4604045 97 }
mbed_official 49:77c8e4604045 98 #endif
mbed_official 49:77c8e4604045 99
mbed_official 49:77c8e4604045 100
mbed_official 49:77c8e4604045 101 /*--------------------------- rt_mut_release --------------------------------*/
mbed_official 49:77c8e4604045 102
mbed_official 49:77c8e4604045 103 OS_RESULT rt_mut_release (OS_ID mutex) {
mbed_official 49:77c8e4604045 104 /* Release a mutex object */
mbed_official 49:77c8e4604045 105 P_MUCB p_MCB = mutex;
mbed_official 49:77c8e4604045 106 P_TCB p_TCB;
mbed_official 49:77c8e4604045 107
mbed_official 49:77c8e4604045 108 if (p_MCB->level == 0 || p_MCB->owner != os_tsk.run) {
mbed_official 49:77c8e4604045 109 /* Unbalanced mutex release or task is not the owner */
mbed_official 49:77c8e4604045 110 return (OS_R_NOK);
mbed_official 49:77c8e4604045 111 }
mbed_official 49:77c8e4604045 112 if (--p_MCB->level != 0) {
mbed_official 49:77c8e4604045 113 return (OS_R_OK);
mbed_official 49:77c8e4604045 114 }
mbed_official 49:77c8e4604045 115 /* Restore owner task's priority. */
mbed_official 49:77c8e4604045 116 os_tsk.run->prio = p_MCB->prio;
mbed_official 49:77c8e4604045 117 if (p_MCB->p_lnk != NULL) {
mbed_official 49:77c8e4604045 118 /* A task is waiting for mutex. */
mbed_official 49:77c8e4604045 119 p_TCB = rt_get_first ((P_XCB)p_MCB);
mbed_official 49:77c8e4604045 120 #ifdef __CMSIS_RTOS
mbed_official 49:77c8e4604045 121 rt_ret_val(p_TCB, 0/*osOK*/);
mbed_official 49:77c8e4604045 122 #else
mbed_official 49:77c8e4604045 123 rt_ret_val(p_TCB, OS_R_MUT);
mbed_official 49:77c8e4604045 124 #endif
mbed_official 49:77c8e4604045 125 rt_rmv_dly (p_TCB);
mbed_official 49:77c8e4604045 126 /* A waiting task becomes the owner of this mutex. */
mbed_official 49:77c8e4604045 127 p_MCB->level = 1;
mbed_official 49:77c8e4604045 128 p_MCB->owner = p_TCB;
mbed_official 49:77c8e4604045 129 p_MCB->prio = p_TCB->prio;
mbed_official 49:77c8e4604045 130 /* Priority inversion, check which task continues. */
mbed_official 49:77c8e4604045 131 if (os_tsk.run->prio >= rt_rdy_prio()) {
mbed_official 49:77c8e4604045 132 rt_dispatch (p_TCB);
mbed_official 49:77c8e4604045 133 }
mbed_official 49:77c8e4604045 134 else {
mbed_official 49:77c8e4604045 135 /* Ready task has higher priority than running task. */
mbed_official 49:77c8e4604045 136 rt_put_prio (&os_rdy, os_tsk.run);
mbed_official 49:77c8e4604045 137 rt_put_prio (&os_rdy, p_TCB);
mbed_official 49:77c8e4604045 138 os_tsk.run->state = READY;
mbed_official 49:77c8e4604045 139 p_TCB->state = READY;
mbed_official 49:77c8e4604045 140 rt_dispatch (NULL);
mbed_official 49:77c8e4604045 141 }
mbed_official 49:77c8e4604045 142 }
mbed_official 49:77c8e4604045 143 else {
mbed_official 49:77c8e4604045 144 /* Check if own priority raised by priority inversion. */
mbed_official 49:77c8e4604045 145 if (rt_rdy_prio() > os_tsk.run->prio) {
mbed_official 49:77c8e4604045 146 rt_put_prio (&os_rdy, os_tsk.run);
mbed_official 49:77c8e4604045 147 os_tsk.run->state = READY;
mbed_official 49:77c8e4604045 148 rt_dispatch (NULL);
mbed_official 49:77c8e4604045 149 }
mbed_official 49:77c8e4604045 150 }
mbed_official 49:77c8e4604045 151 return (OS_R_OK);
mbed_official 49:77c8e4604045 152 }
mbed_official 49:77c8e4604045 153
mbed_official 49:77c8e4604045 154
mbed_official 49:77c8e4604045 155 /*--------------------------- rt_mut_wait -----------------------------------*/
mbed_official 49:77c8e4604045 156
mbed_official 49:77c8e4604045 157 OS_RESULT rt_mut_wait (OS_ID mutex, U16 timeout) {
mbed_official 49:77c8e4604045 158 /* Wait for a mutex, continue when mutex is free. */
mbed_official 49:77c8e4604045 159 P_MUCB p_MCB = mutex;
mbed_official 49:77c8e4604045 160
mbed_official 49:77c8e4604045 161 if (p_MCB->level == 0) {
mbed_official 49:77c8e4604045 162 p_MCB->owner = os_tsk.run;
mbed_official 49:77c8e4604045 163 p_MCB->prio = os_tsk.run->prio;
mbed_official 49:77c8e4604045 164 goto inc;
mbed_official 49:77c8e4604045 165 }
mbed_official 49:77c8e4604045 166 if (p_MCB->owner == os_tsk.run) {
mbed_official 49:77c8e4604045 167 /* OK, running task is the owner of this mutex. */
mbed_official 49:77c8e4604045 168 inc:p_MCB->level++;
mbed_official 49:77c8e4604045 169 return (OS_R_OK);
mbed_official 49:77c8e4604045 170 }
mbed_official 49:77c8e4604045 171 /* Mutex owned by another task, wait until released. */
mbed_official 49:77c8e4604045 172 if (timeout == 0) {
mbed_official 49:77c8e4604045 173 return (OS_R_TMO);
mbed_official 49:77c8e4604045 174 }
mbed_official 49:77c8e4604045 175 /* Raise the owner task priority if lower than current priority. */
mbed_official 49:77c8e4604045 176 /* This priority inversion is called priority inheritance. */
mbed_official 49:77c8e4604045 177 if (p_MCB->prio < os_tsk.run->prio) {
mbed_official 49:77c8e4604045 178 p_MCB->owner->prio = os_tsk.run->prio;
mbed_official 49:77c8e4604045 179 rt_resort_prio (p_MCB->owner);
mbed_official 49:77c8e4604045 180 }
mbed_official 49:77c8e4604045 181 if (p_MCB->p_lnk != NULL) {
mbed_official 49:77c8e4604045 182 rt_put_prio ((P_XCB)p_MCB, os_tsk.run);
mbed_official 49:77c8e4604045 183 }
mbed_official 49:77c8e4604045 184 else {
mbed_official 49:77c8e4604045 185 p_MCB->p_lnk = os_tsk.run;
mbed_official 49:77c8e4604045 186 os_tsk.run->p_lnk = NULL;
mbed_official 49:77c8e4604045 187 os_tsk.run->p_rlnk = (P_TCB)p_MCB;
mbed_official 49:77c8e4604045 188 }
mbed_official 49:77c8e4604045 189 rt_block(timeout, WAIT_MUT);
mbed_official 49:77c8e4604045 190 return (OS_R_TMO);
mbed_official 49:77c8e4604045 191 }
mbed_official 49:77c8e4604045 192
mbed_official 49:77c8e4604045 193
mbed_official 49:77c8e4604045 194 /*----------------------------------------------------------------------------
mbed_official 49:77c8e4604045 195 * end of file
mbed_official 49:77c8e4604045 196 *---------------------------------------------------------------------------*/
mbed_official 49:77c8e4604045 197