Daoyu_Sofiane Yao_Belouka / mbed-rtos

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Dependents:   Mecatro_Gyro_Programme_Codeur_HC06

rtx/TARGET_CORTEX_M/rt_Semaphore.c@0:a8ed743bc1e1, 2021-04-16 (annotated)

Committer:
daoyu_sofiane
Date:
Fri Apr 16 09:25:33 2021 +0000
Revision:
0:a8ed743bc1e1
Projet Gyropode

Who changed what in which revision?

UserRevisionLine numberNew contents of line
daoyu_sofiane 0:a8ed743bc1e1 1 /*----------------------------------------------------------------------------
daoyu_sofiane 0:a8ed743bc1e1 2 * CMSIS-RTOS - RTX
daoyu_sofiane 0:a8ed743bc1e1 3 *----------------------------------------------------------------------------
daoyu_sofiane 0:a8ed743bc1e1 4 * Name: RT_SEMAPHORE.C
daoyu_sofiane 0:a8ed743bc1e1 5 * Purpose: Implements binary and counting semaphores
daoyu_sofiane 0:a8ed743bc1e1 6 * Rev.: V4.79
daoyu_sofiane 0:a8ed743bc1e1 7 *----------------------------------------------------------------------------
daoyu_sofiane 0:a8ed743bc1e1 8 *
daoyu_sofiane 0:a8ed743bc1e1 9 * Copyright (c) 1999-2009 KEIL, 2009-2015 ARM Germany GmbH
daoyu_sofiane 0:a8ed743bc1e1 10 * All rights reserved.
daoyu_sofiane 0:a8ed743bc1e1 11 * Redistribution and use in source and binary forms, with or without
daoyu_sofiane 0:a8ed743bc1e1 12 * modification, are permitted provided that the following conditions are met:
daoyu_sofiane 0:a8ed743bc1e1 13 * - Redistributions of source code must retain the above copyright
daoyu_sofiane 0:a8ed743bc1e1 14 * notice, this list of conditions and the following disclaimer.
daoyu_sofiane 0:a8ed743bc1e1 15 * - Redistributions in binary form must reproduce the above copyright
daoyu_sofiane 0:a8ed743bc1e1 16 * notice, this list of conditions and the following disclaimer in the
daoyu_sofiane 0:a8ed743bc1e1 17 * documentation and/or other materials provided with the distribution.
daoyu_sofiane 0:a8ed743bc1e1 18 * - Neither the name of ARM nor the names of its contributors may be used
daoyu_sofiane 0:a8ed743bc1e1 19 * to endorse or promote products derived from this software without
daoyu_sofiane 0:a8ed743bc1e1 20 * specific prior written permission.
daoyu_sofiane 0:a8ed743bc1e1 21 *
daoyu_sofiane 0:a8ed743bc1e1 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
daoyu_sofiane 0:a8ed743bc1e1 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
daoyu_sofiane 0:a8ed743bc1e1 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
daoyu_sofiane 0:a8ed743bc1e1 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
daoyu_sofiane 0:a8ed743bc1e1 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
daoyu_sofiane 0:a8ed743bc1e1 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
daoyu_sofiane 0:a8ed743bc1e1 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
daoyu_sofiane 0:a8ed743bc1e1 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
daoyu_sofiane 0:a8ed743bc1e1 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
daoyu_sofiane 0:a8ed743bc1e1 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
daoyu_sofiane 0:a8ed743bc1e1 32 * POSSIBILITY OF SUCH DAMAGE.
daoyu_sofiane 0:a8ed743bc1e1 33 *---------------------------------------------------------------------------*/
daoyu_sofiane 0:a8ed743bc1e1 34
daoyu_sofiane 0:a8ed743bc1e1 35 #include "rt_TypeDef.h"
daoyu_sofiane 0:a8ed743bc1e1 36 #include "RTX_Config.h"
daoyu_sofiane 0:a8ed743bc1e1 37 #include "rt_System.h"
daoyu_sofiane 0:a8ed743bc1e1 38 #include "rt_List.h"
daoyu_sofiane 0:a8ed743bc1e1 39 #include "rt_Task.h"
daoyu_sofiane 0:a8ed743bc1e1 40 #include "rt_Semaphore.h"
daoyu_sofiane 0:a8ed743bc1e1 41 #include "rt_HAL_CM.h"
daoyu_sofiane 0:a8ed743bc1e1 42
daoyu_sofiane 0:a8ed743bc1e1 43
daoyu_sofiane 0:a8ed743bc1e1 44 /*----------------------------------------------------------------------------
daoyu_sofiane 0:a8ed743bc1e1 45 * Functions
daoyu_sofiane 0:a8ed743bc1e1 46 *---------------------------------------------------------------------------*/
daoyu_sofiane 0:a8ed743bc1e1 47
daoyu_sofiane 0:a8ed743bc1e1 48
daoyu_sofiane 0:a8ed743bc1e1 49 /*--------------------------- rt_sem_init -----------------------------------*/
daoyu_sofiane 0:a8ed743bc1e1 50
daoyu_sofiane 0:a8ed743bc1e1 51 void rt_sem_init (OS_ID semaphore, U16 token_count) {
daoyu_sofiane 0:a8ed743bc1e1 52 /* Initialize a semaphore */
daoyu_sofiane 0:a8ed743bc1e1 53 P_SCB p_SCB = semaphore;
daoyu_sofiane 0:a8ed743bc1e1 54
daoyu_sofiane 0:a8ed743bc1e1 55 p_SCB->cb_type = SCB;
daoyu_sofiane 0:a8ed743bc1e1 56 p_SCB->p_lnk = NULL;
daoyu_sofiane 0:a8ed743bc1e1 57 p_SCB->tokens = token_count;
daoyu_sofiane 0:a8ed743bc1e1 58 }
daoyu_sofiane 0:a8ed743bc1e1 59
daoyu_sofiane 0:a8ed743bc1e1 60
daoyu_sofiane 0:a8ed743bc1e1 61 /*--------------------------- rt_sem_delete ---------------------------------*/
daoyu_sofiane 0:a8ed743bc1e1 62
daoyu_sofiane 0:a8ed743bc1e1 63 #ifdef __CMSIS_RTOS
daoyu_sofiane 0:a8ed743bc1e1 64 OS_RESULT rt_sem_delete (OS_ID semaphore) {
daoyu_sofiane 0:a8ed743bc1e1 65 /* Delete semaphore */
daoyu_sofiane 0:a8ed743bc1e1 66 P_SCB p_SCB = semaphore;
daoyu_sofiane 0:a8ed743bc1e1 67 P_TCB p_TCB;
daoyu_sofiane 0:a8ed743bc1e1 68
daoyu_sofiane 0:a8ed743bc1e1 69 while (p_SCB->p_lnk != NULL) {
daoyu_sofiane 0:a8ed743bc1e1 70 /* A task is waiting for token */
daoyu_sofiane 0:a8ed743bc1e1 71 p_TCB = rt_get_first ((P_XCB)p_SCB);
daoyu_sofiane 0:a8ed743bc1e1 72 rt_ret_val(p_TCB, 0U);
daoyu_sofiane 0:a8ed743bc1e1 73 rt_rmv_dly(p_TCB);
daoyu_sofiane 0:a8ed743bc1e1 74 p_TCB->state = READY;
daoyu_sofiane 0:a8ed743bc1e1 75 rt_put_prio (&os_rdy, p_TCB);
daoyu_sofiane 0:a8ed743bc1e1 76 }
daoyu_sofiane 0:a8ed743bc1e1 77
daoyu_sofiane 0:a8ed743bc1e1 78 if ((os_rdy.p_lnk != NULL) && (os_rdy.p_lnk->prio > os_tsk.run->prio)) {
daoyu_sofiane 0:a8ed743bc1e1 79 /* preempt running task */
daoyu_sofiane 0:a8ed743bc1e1 80 rt_put_prio (&os_rdy, os_tsk.run);
daoyu_sofiane 0:a8ed743bc1e1 81 os_tsk.run->state = READY;
daoyu_sofiane 0:a8ed743bc1e1 82 rt_dispatch (NULL);
daoyu_sofiane 0:a8ed743bc1e1 83 }
daoyu_sofiane 0:a8ed743bc1e1 84
daoyu_sofiane 0:a8ed743bc1e1 85 p_SCB->cb_type = 0U;
daoyu_sofiane 0:a8ed743bc1e1 86
daoyu_sofiane 0:a8ed743bc1e1 87 return (OS_R_OK);
daoyu_sofiane 0:a8ed743bc1e1 88 }
daoyu_sofiane 0:a8ed743bc1e1 89 #endif
daoyu_sofiane 0:a8ed743bc1e1 90
daoyu_sofiane 0:a8ed743bc1e1 91
daoyu_sofiane 0:a8ed743bc1e1 92 /*--------------------------- rt_sem_send -----------------------------------*/
daoyu_sofiane 0:a8ed743bc1e1 93
daoyu_sofiane 0:a8ed743bc1e1 94 OS_RESULT rt_sem_send (OS_ID semaphore) {
daoyu_sofiane 0:a8ed743bc1e1 95 /* Return a token to semaphore */
daoyu_sofiane 0:a8ed743bc1e1 96 P_SCB p_SCB = semaphore;
daoyu_sofiane 0:a8ed743bc1e1 97 P_TCB p_TCB;
daoyu_sofiane 0:a8ed743bc1e1 98
daoyu_sofiane 0:a8ed743bc1e1 99 if (p_SCB->p_lnk != NULL) {
daoyu_sofiane 0:a8ed743bc1e1 100 /* A task is waiting for token */
daoyu_sofiane 0:a8ed743bc1e1 101 p_TCB = rt_get_first ((P_XCB)p_SCB);
daoyu_sofiane 0:a8ed743bc1e1 102 #ifdef __CMSIS_RTOS
daoyu_sofiane 0:a8ed743bc1e1 103 rt_ret_val(p_TCB, 1U);
daoyu_sofiane 0:a8ed743bc1e1 104 #else
daoyu_sofiane 0:a8ed743bc1e1 105 rt_ret_val(p_TCB, OS_R_SEM);
daoyu_sofiane 0:a8ed743bc1e1 106 #endif
daoyu_sofiane 0:a8ed743bc1e1 107 rt_rmv_dly (p_TCB);
daoyu_sofiane 0:a8ed743bc1e1 108 rt_dispatch (p_TCB);
daoyu_sofiane 0:a8ed743bc1e1 109 }
daoyu_sofiane 0:a8ed743bc1e1 110 else {
daoyu_sofiane 0:a8ed743bc1e1 111 /* Store token. */
daoyu_sofiane 0:a8ed743bc1e1 112 p_SCB->tokens++;
daoyu_sofiane 0:a8ed743bc1e1 113 }
daoyu_sofiane 0:a8ed743bc1e1 114 return (OS_R_OK);
daoyu_sofiane 0:a8ed743bc1e1 115 }
daoyu_sofiane 0:a8ed743bc1e1 116
daoyu_sofiane 0:a8ed743bc1e1 117
daoyu_sofiane 0:a8ed743bc1e1 118 /*--------------------------- rt_sem_wait -----------------------------------*/
daoyu_sofiane 0:a8ed743bc1e1 119
daoyu_sofiane 0:a8ed743bc1e1 120 OS_RESULT rt_sem_wait (OS_ID semaphore, U16 timeout) {
daoyu_sofiane 0:a8ed743bc1e1 121 /* Obtain a token; possibly wait for it */
daoyu_sofiane 0:a8ed743bc1e1 122 P_SCB p_SCB = semaphore;
daoyu_sofiane 0:a8ed743bc1e1 123
daoyu_sofiane 0:a8ed743bc1e1 124 if (p_SCB->tokens) {
daoyu_sofiane 0:a8ed743bc1e1 125 p_SCB->tokens--;
daoyu_sofiane 0:a8ed743bc1e1 126 return (OS_R_OK);
daoyu_sofiane 0:a8ed743bc1e1 127 }
daoyu_sofiane 0:a8ed743bc1e1 128 /* No token available: wait for one */
daoyu_sofiane 0:a8ed743bc1e1 129 if (timeout == 0U) {
daoyu_sofiane 0:a8ed743bc1e1 130 return (OS_R_TMO);
daoyu_sofiane 0:a8ed743bc1e1 131 }
daoyu_sofiane 0:a8ed743bc1e1 132 if (p_SCB->p_lnk != NULL) {
daoyu_sofiane 0:a8ed743bc1e1 133 rt_put_prio ((P_XCB)p_SCB, os_tsk.run);
daoyu_sofiane 0:a8ed743bc1e1 134 }
daoyu_sofiane 0:a8ed743bc1e1 135 else {
daoyu_sofiane 0:a8ed743bc1e1 136 p_SCB->p_lnk = os_tsk.run;
daoyu_sofiane 0:a8ed743bc1e1 137 os_tsk.run->p_lnk = NULL;
daoyu_sofiane 0:a8ed743bc1e1 138 os_tsk.run->p_rlnk = (P_TCB)p_SCB;
daoyu_sofiane 0:a8ed743bc1e1 139 }
daoyu_sofiane 0:a8ed743bc1e1 140 rt_block(timeout, WAIT_SEM);
daoyu_sofiane 0:a8ed743bc1e1 141 return (OS_R_TMO);
daoyu_sofiane 0:a8ed743bc1e1 142 }
daoyu_sofiane 0:a8ed743bc1e1 143
daoyu_sofiane 0:a8ed743bc1e1 144
daoyu_sofiane 0:a8ed743bc1e1 145 /*--------------------------- isr_sem_send ----------------------------------*/
daoyu_sofiane 0:a8ed743bc1e1 146
daoyu_sofiane 0:a8ed743bc1e1 147 void isr_sem_send (OS_ID semaphore) {
daoyu_sofiane 0:a8ed743bc1e1 148 /* Same function as "os_sem_send", but to be called by ISRs */
daoyu_sofiane 0:a8ed743bc1e1 149 P_SCB p_SCB = semaphore;
daoyu_sofiane 0:a8ed743bc1e1 150
daoyu_sofiane 0:a8ed743bc1e1 151 rt_psq_enq (p_SCB, 0U);
daoyu_sofiane 0:a8ed743bc1e1 152 rt_psh_req ();
daoyu_sofiane 0:a8ed743bc1e1 153 }
daoyu_sofiane 0:a8ed743bc1e1 154
daoyu_sofiane 0:a8ed743bc1e1 155
daoyu_sofiane 0:a8ed743bc1e1 156 /*--------------------------- rt_sem_psh ------------------------------------*/
daoyu_sofiane 0:a8ed743bc1e1 157
daoyu_sofiane 0:a8ed743bc1e1 158 void rt_sem_psh (P_SCB p_CB) {
daoyu_sofiane 0:a8ed743bc1e1 159 /* Check if task has to be waken up */
daoyu_sofiane 0:a8ed743bc1e1 160 P_TCB p_TCB;
daoyu_sofiane 0:a8ed743bc1e1 161
daoyu_sofiane 0:a8ed743bc1e1 162 if (p_CB->p_lnk != NULL) {
daoyu_sofiane 0:a8ed743bc1e1 163 /* A task is waiting for token */
daoyu_sofiane 0:a8ed743bc1e1 164 p_TCB = rt_get_first ((P_XCB)p_CB);
daoyu_sofiane 0:a8ed743bc1e1 165 rt_rmv_dly (p_TCB);
daoyu_sofiane 0:a8ed743bc1e1 166 p_TCB->state = READY;
daoyu_sofiane 0:a8ed743bc1e1 167 #ifdef __CMSIS_RTOS
daoyu_sofiane 0:a8ed743bc1e1 168 rt_ret_val(p_TCB, 1U);
daoyu_sofiane 0:a8ed743bc1e1 169 #else
daoyu_sofiane 0:a8ed743bc1e1 170 rt_ret_val(p_TCB, OS_R_SEM);
daoyu_sofiane 0:a8ed743bc1e1 171 #endif
daoyu_sofiane 0:a8ed743bc1e1 172 rt_put_prio (&os_rdy, p_TCB);
daoyu_sofiane 0:a8ed743bc1e1 173 }
daoyu_sofiane 0:a8ed743bc1e1 174 else {
daoyu_sofiane 0:a8ed743bc1e1 175 /* Store token */
daoyu_sofiane 0:a8ed743bc1e1 176 p_CB->tokens++;
daoyu_sofiane 0:a8ed743bc1e1 177 }
daoyu_sofiane 0:a8ed743bc1e1 178 }
daoyu_sofiane 0:a8ed743bc1e1 179
daoyu_sofiane 0:a8ed743bc1e1 180 /*----------------------------------------------------------------------------
daoyu_sofiane 0:a8ed743bc1e1 181 * end of file
daoyu_sofiane 0:a8ed743bc1e1 182 *---------------------------------------------------------------------------*/