Pierre Provent / USBHost

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Dependents:   TEST_USB_Nucleo_F429ZI Essais_USB_Nucleo_F429ZI SID_V3_Nucleo_F429ZI SID_V4_Nucleo_F429ZI_copy

mbed-rtos/rtx/TARGET_ARM7/rt_Mutex.c@0:77ca32e8e04e, 2020-09-25 (annotated)

Committer:
pierreprovent
Date:
Fri Sep 25 10:17:49 2020 +0000
Revision:
0:77ca32e8e04e
Programme acquisition en enregistrement sur clef USB carte Nucleo F429ZI cours ELE118 Cnam

Who changed what in which revision?

UserRevisionLine numberNew contents of line
pierreprovent 0:77ca32e8e04e 1 /*----------------------------------------------------------------------------
pierreprovent 0:77ca32e8e04e 2 * RL-ARM - RTX
pierreprovent 0:77ca32e8e04e 3 *----------------------------------------------------------------------------
pierreprovent 0:77ca32e8e04e 4 * Name: RT_MUTEX.C
pierreprovent 0:77ca32e8e04e 5 * Purpose: Implements mutex synchronization objects
pierreprovent 0:77ca32e8e04e 6 * Rev.: V4.60
pierreprovent 0:77ca32e8e04e 7 *----------------------------------------------------------------------------
pierreprovent 0:77ca32e8e04e 8 *
pierreprovent 0:77ca32e8e04e 9 * Copyright (c) 1999-2009 KEIL, 2009-2015 ARM Germany GmbH
pierreprovent 0:77ca32e8e04e 10 * All rights reserved.
pierreprovent 0:77ca32e8e04e 11 * Redistribution and use in source and binary forms, with or without
pierreprovent 0:77ca32e8e04e 12 * modification, are permitted provided that the following conditions are met:
pierreprovent 0:77ca32e8e04e 13 * - Redistributions of source code must retain the above copyright
pierreprovent 0:77ca32e8e04e 14 * notice, this list of conditions and the following disclaimer.
pierreprovent 0:77ca32e8e04e 15 * - Redistributions in binary form must reproduce the above copyright
pierreprovent 0:77ca32e8e04e 16 * notice, this list of conditions and the following disclaimer in the
pierreprovent 0:77ca32e8e04e 17 * documentation and/or other materials provided with the distribution.
pierreprovent 0:77ca32e8e04e 18 * - Neither the name of ARM nor the names of its contributors may be used
pierreprovent 0:77ca32e8e04e 19 * to endorse or promote products derived from this software without
pierreprovent 0:77ca32e8e04e 20 * specific prior written permission.
pierreprovent 0:77ca32e8e04e 21 *
pierreprovent 0:77ca32e8e04e 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
pierreprovent 0:77ca32e8e04e 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
pierreprovent 0:77ca32e8e04e 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
pierreprovent 0:77ca32e8e04e 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
pierreprovent 0:77ca32e8e04e 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
pierreprovent 0:77ca32e8e04e 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
pierreprovent 0:77ca32e8e04e 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
pierreprovent 0:77ca32e8e04e 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
pierreprovent 0:77ca32e8e04e 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
pierreprovent 0:77ca32e8e04e 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
pierreprovent 0:77ca32e8e04e 32 * POSSIBILITY OF SUCH DAMAGE.
pierreprovent 0:77ca32e8e04e 33 *---------------------------------------------------------------------------*/
pierreprovent 0:77ca32e8e04e 34
pierreprovent 0:77ca32e8e04e 35 #include "rt_TypeDef.h"
pierreprovent 0:77ca32e8e04e 36 #include "RTX_Conf.h"
pierreprovent 0:77ca32e8e04e 37 #include "rt_List.h"
pierreprovent 0:77ca32e8e04e 38 #include "rt_Task.h"
pierreprovent 0:77ca32e8e04e 39 #include "rt_Mutex.h"
pierreprovent 0:77ca32e8e04e 40 #include "rt_HAL_CM.h"
pierreprovent 0:77ca32e8e04e 41
pierreprovent 0:77ca32e8e04e 42
pierreprovent 0:77ca32e8e04e 43 /*----------------------------------------------------------------------------
pierreprovent 0:77ca32e8e04e 44 * Functions
pierreprovent 0:77ca32e8e04e 45 *---------------------------------------------------------------------------*/
pierreprovent 0:77ca32e8e04e 46
pierreprovent 0:77ca32e8e04e 47
pierreprovent 0:77ca32e8e04e 48 /*--------------------------- rt_mut_init -----------------------------------*/
pierreprovent 0:77ca32e8e04e 49
pierreprovent 0:77ca32e8e04e 50 void rt_mut_init (OS_ID mutex) {
pierreprovent 0:77ca32e8e04e 51 /* Initialize a mutex object */
pierreprovent 0:77ca32e8e04e 52 P_MUCB p_MCB = mutex;
pierreprovent 0:77ca32e8e04e 53
pierreprovent 0:77ca32e8e04e 54 p_MCB->cb_type = MUCB;
pierreprovent 0:77ca32e8e04e 55 p_MCB->prio = 0;
pierreprovent 0:77ca32e8e04e 56 p_MCB->level = 0;
pierreprovent 0:77ca32e8e04e 57 p_MCB->p_lnk = NULL;
pierreprovent 0:77ca32e8e04e 58 p_MCB->owner = NULL;
pierreprovent 0:77ca32e8e04e 59 }
pierreprovent 0:77ca32e8e04e 60
pierreprovent 0:77ca32e8e04e 61
pierreprovent 0:77ca32e8e04e 62 /*--------------------------- rt_mut_delete ---------------------------------*/
pierreprovent 0:77ca32e8e04e 63
pierreprovent 0:77ca32e8e04e 64 #ifdef __CMSIS_RTOS
pierreprovent 0:77ca32e8e04e 65 OS_RESULT rt_mut_delete (OS_ID mutex) {
pierreprovent 0:77ca32e8e04e 66 /* Delete a mutex object */
pierreprovent 0:77ca32e8e04e 67 P_MUCB p_MCB = mutex;
pierreprovent 0:77ca32e8e04e 68 P_TCB p_TCB;
pierreprovent 0:77ca32e8e04e 69
pierreprovent 0:77ca32e8e04e 70 /* Restore owner task's priority. */
pierreprovent 0:77ca32e8e04e 71 if (p_MCB->level != 0) {
pierreprovent 0:77ca32e8e04e 72 p_MCB->owner->prio = p_MCB->prio;
pierreprovent 0:77ca32e8e04e 73 if (p_MCB->owner != os_tsk.run) {
pierreprovent 0:77ca32e8e04e 74 rt_resort_prio (p_MCB->owner);
pierreprovent 0:77ca32e8e04e 75 }
pierreprovent 0:77ca32e8e04e 76 }
pierreprovent 0:77ca32e8e04e 77
pierreprovent 0:77ca32e8e04e 78 while (p_MCB->p_lnk != NULL) {
pierreprovent 0:77ca32e8e04e 79 /* A task is waiting for mutex. */
pierreprovent 0:77ca32e8e04e 80 p_TCB = rt_get_first ((P_XCB)p_MCB);
pierreprovent 0:77ca32e8e04e 81 rt_ret_val(p_TCB, 0/*osOK*/);
pierreprovent 0:77ca32e8e04e 82 rt_rmv_dly(p_TCB);
pierreprovent 0:77ca32e8e04e 83 p_TCB->state = READY;
pierreprovent 0:77ca32e8e04e 84 rt_put_prio (&os_rdy, p_TCB);
pierreprovent 0:77ca32e8e04e 85 }
pierreprovent 0:77ca32e8e04e 86
pierreprovent 0:77ca32e8e04e 87 if (os_rdy.p_lnk && (os_rdy.p_lnk->prio > os_tsk.run->prio)) {
pierreprovent 0:77ca32e8e04e 88 /* preempt running task */
pierreprovent 0:77ca32e8e04e 89 rt_put_prio (&os_rdy, os_tsk.run);
pierreprovent 0:77ca32e8e04e 90 os_tsk.run->state = READY;
pierreprovent 0:77ca32e8e04e 91 rt_dispatch (NULL);
pierreprovent 0:77ca32e8e04e 92 }
pierreprovent 0:77ca32e8e04e 93
pierreprovent 0:77ca32e8e04e 94 p_MCB->cb_type = 0;
pierreprovent 0:77ca32e8e04e 95
pierreprovent 0:77ca32e8e04e 96 return (OS_R_OK);
pierreprovent 0:77ca32e8e04e 97 }
pierreprovent 0:77ca32e8e04e 98 #endif
pierreprovent 0:77ca32e8e04e 99
pierreprovent 0:77ca32e8e04e 100
pierreprovent 0:77ca32e8e04e 101 /*--------------------------- rt_mut_release --------------------------------*/
pierreprovent 0:77ca32e8e04e 102
pierreprovent 0:77ca32e8e04e 103 OS_RESULT rt_mut_release (OS_ID mutex) {
pierreprovent 0:77ca32e8e04e 104 /* Release a mutex object */
pierreprovent 0:77ca32e8e04e 105 P_MUCB p_MCB = mutex;
pierreprovent 0:77ca32e8e04e 106 P_TCB p_TCB;
pierreprovent 0:77ca32e8e04e 107
pierreprovent 0:77ca32e8e04e 108 if (p_MCB->level == 0 || p_MCB->owner != os_tsk.run) {
pierreprovent 0:77ca32e8e04e 109 /* Unbalanced mutex release or task is not the owner */
pierreprovent 0:77ca32e8e04e 110 return (OS_R_NOK);
pierreprovent 0:77ca32e8e04e 111 }
pierreprovent 0:77ca32e8e04e 112 if (--p_MCB->level != 0) {
pierreprovent 0:77ca32e8e04e 113 return (OS_R_OK);
pierreprovent 0:77ca32e8e04e 114 }
pierreprovent 0:77ca32e8e04e 115 /* Restore owner task's priority. */
pierreprovent 0:77ca32e8e04e 116 os_tsk.run->prio = p_MCB->prio;
pierreprovent 0:77ca32e8e04e 117 if (p_MCB->p_lnk != NULL) {
pierreprovent 0:77ca32e8e04e 118 /* A task is waiting for mutex. */
pierreprovent 0:77ca32e8e04e 119 p_TCB = rt_get_first ((P_XCB)p_MCB);
pierreprovent 0:77ca32e8e04e 120 #ifdef __CMSIS_RTOS
pierreprovent 0:77ca32e8e04e 121 rt_ret_val(p_TCB, 0/*osOK*/);
pierreprovent 0:77ca32e8e04e 122 #else
pierreprovent 0:77ca32e8e04e 123 rt_ret_val(p_TCB, OS_R_MUT);
pierreprovent 0:77ca32e8e04e 124 #endif
pierreprovent 0:77ca32e8e04e 125 rt_rmv_dly (p_TCB);
pierreprovent 0:77ca32e8e04e 126 /* A waiting task becomes the owner of this mutex. */
pierreprovent 0:77ca32e8e04e 127 p_MCB->level = 1;
pierreprovent 0:77ca32e8e04e 128 p_MCB->owner = p_TCB;
pierreprovent 0:77ca32e8e04e 129 p_MCB->prio = p_TCB->prio;
pierreprovent 0:77ca32e8e04e 130 /* Priority inversion, check which task continues. */
pierreprovent 0:77ca32e8e04e 131 if (os_tsk.run->prio >= rt_rdy_prio()) {
pierreprovent 0:77ca32e8e04e 132 rt_dispatch (p_TCB);
pierreprovent 0:77ca32e8e04e 133 }
pierreprovent 0:77ca32e8e04e 134 else {
pierreprovent 0:77ca32e8e04e 135 /* Ready task has higher priority than running task. */
pierreprovent 0:77ca32e8e04e 136 rt_put_prio (&os_rdy, os_tsk.run);
pierreprovent 0:77ca32e8e04e 137 rt_put_prio (&os_rdy, p_TCB);
pierreprovent 0:77ca32e8e04e 138 os_tsk.run->state = READY;
pierreprovent 0:77ca32e8e04e 139 p_TCB->state = READY;
pierreprovent 0:77ca32e8e04e 140 rt_dispatch (NULL);
pierreprovent 0:77ca32e8e04e 141 }
pierreprovent 0:77ca32e8e04e 142 }
pierreprovent 0:77ca32e8e04e 143 else {
pierreprovent 0:77ca32e8e04e 144 /* Check if own priority raised by priority inversion. */
pierreprovent 0:77ca32e8e04e 145 if (rt_rdy_prio() > os_tsk.run->prio) {
pierreprovent 0:77ca32e8e04e 146 rt_put_prio (&os_rdy, os_tsk.run);
pierreprovent 0:77ca32e8e04e 147 os_tsk.run->state = READY;
pierreprovent 0:77ca32e8e04e 148 rt_dispatch (NULL);
pierreprovent 0:77ca32e8e04e 149 }
pierreprovent 0:77ca32e8e04e 150 }
pierreprovent 0:77ca32e8e04e 151 return (OS_R_OK);
pierreprovent 0:77ca32e8e04e 152 }
pierreprovent 0:77ca32e8e04e 153
pierreprovent 0:77ca32e8e04e 154
pierreprovent 0:77ca32e8e04e 155 /*--------------------------- rt_mut_wait -----------------------------------*/
pierreprovent 0:77ca32e8e04e 156
pierreprovent 0:77ca32e8e04e 157 OS_RESULT rt_mut_wait (OS_ID mutex, U16 timeout) {
pierreprovent 0:77ca32e8e04e 158 /* Wait for a mutex, continue when mutex is free. */
pierreprovent 0:77ca32e8e04e 159 P_MUCB p_MCB = mutex;
pierreprovent 0:77ca32e8e04e 160
pierreprovent 0:77ca32e8e04e 161 if (p_MCB->level == 0) {
pierreprovent 0:77ca32e8e04e 162 p_MCB->owner = os_tsk.run;
pierreprovent 0:77ca32e8e04e 163 p_MCB->prio = os_tsk.run->prio;
pierreprovent 0:77ca32e8e04e 164 goto inc;
pierreprovent 0:77ca32e8e04e 165 }
pierreprovent 0:77ca32e8e04e 166 if (p_MCB->owner == os_tsk.run) {
pierreprovent 0:77ca32e8e04e 167 /* OK, running task is the owner of this mutex. */
pierreprovent 0:77ca32e8e04e 168 inc:p_MCB->level++;
pierreprovent 0:77ca32e8e04e 169 return (OS_R_OK);
pierreprovent 0:77ca32e8e04e 170 }
pierreprovent 0:77ca32e8e04e 171 /* Mutex owned by another task, wait until released. */
pierreprovent 0:77ca32e8e04e 172 if (timeout == 0) {
pierreprovent 0:77ca32e8e04e 173 return (OS_R_TMO);
pierreprovent 0:77ca32e8e04e 174 }
pierreprovent 0:77ca32e8e04e 175 /* Raise the owner task priority if lower than current priority. */
pierreprovent 0:77ca32e8e04e 176 /* This priority inversion is called priority inheritance. */
pierreprovent 0:77ca32e8e04e 177 if (p_MCB->prio < os_tsk.run->prio) {
pierreprovent 0:77ca32e8e04e 178 p_MCB->owner->prio = os_tsk.run->prio;
pierreprovent 0:77ca32e8e04e 179 rt_resort_prio (p_MCB->owner);
pierreprovent 0:77ca32e8e04e 180 }
pierreprovent 0:77ca32e8e04e 181 if (p_MCB->p_lnk != NULL) {
pierreprovent 0:77ca32e8e04e 182 rt_put_prio ((P_XCB)p_MCB, os_tsk.run);
pierreprovent 0:77ca32e8e04e 183 }
pierreprovent 0:77ca32e8e04e 184 else {
pierreprovent 0:77ca32e8e04e 185 p_MCB->p_lnk = os_tsk.run;
pierreprovent 0:77ca32e8e04e 186 os_tsk.run->p_lnk = NULL;
pierreprovent 0:77ca32e8e04e 187 os_tsk.run->p_rlnk = (P_TCB)p_MCB;
pierreprovent 0:77ca32e8e04e 188 }
pierreprovent 0:77ca32e8e04e 189 rt_block(timeout, WAIT_MUT);
pierreprovent 0:77ca32e8e04e 190 return (OS_R_TMO);
pierreprovent 0:77ca32e8e04e 191 }
pierreprovent 0:77ca32e8e04e 192
pierreprovent 0:77ca32e8e04e 193
pierreprovent 0:77ca32e8e04e 194 /*----------------------------------------------------------------------------
pierreprovent 0:77ca32e8e04e 195 * end of file
pierreprovent 0:77ca32e8e04e 196 *---------------------------------------------------------------------------*/
pierreprovent 0:77ca32e8e04e 197