mbed official / mbed-rtos

Official mbed Real Time Operating System based on the RTX implementation of the CMSIS-RTOS API open standard.

Dependents:   denki-yohou_b TestY201 Network-RTOS NTPClient_HelloWorld ... more

Deprecated

This is the mbed 2 rtos library. mbed OS 5 integrates the mbed library with mbed-rtos. With this, we have provided thread safety for all mbed APIs. If you'd like to learn about using mbed OS 5, please see the docs.

rtx/TARGET_CORTEX_M/rt_Semaphore.c@121:3da5f554d8bf, 2016-09-01 (annotated)

Committer:
<>
Date:
Thu Sep 01 15:13:42 2016 +0100
Revision:
121:3da5f554d8bf
Parent:
112:53ace74b190c 
RTOS rev121



Compatible with the mbed library v125



Changes:

- K64F: Revert to hardcoded stack pointer in RTX.

- Adding NCS36510 support.

- Add MAX32620 target support.

- Fix implicit declaration of function 'atexit'.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 49:77c8e4604045 1 /*----------------------------------------------------------------------------
mbed_official 112:53ace74b190c 2 * CMSIS-RTOS - RTX
mbed_official 49:77c8e4604045 3 *----------------------------------------------------------------------------
mbed_official 49:77c8e4604045 4 * Name: RT_SEMAPHORE.C
mbed_official 49:77c8e4604045 5 * Purpose: Implements binary and counting semaphores
mbed_official 112:53ace74b190c 6 * Rev.: V4.79
mbed_official 49:77c8e4604045 7 *----------------------------------------------------------------------------
mbed_official 49:77c8e4604045 8 *
mbed_official 112:53ace74b190c 9 * Copyright (c) 1999-2009 KEIL, 2009-2015 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 112:53ace74b190c 36 #include "RTX_Config.h"
mbed_official 49:77c8e4604045 37 #include "rt_System.h"
mbed_official 49:77c8e4604045 38 #include "rt_List.h"
mbed_official 49:77c8e4604045 39 #include "rt_Task.h"
mbed_official 49:77c8e4604045 40 #include "rt_Semaphore.h"
mbed_official 49:77c8e4604045 41 #include "rt_HAL_CM.h"
mbed_official 49:77c8e4604045 42
mbed_official 49:77c8e4604045 43
mbed_official 49:77c8e4604045 44 /*----------------------------------------------------------------------------
mbed_official 49:77c8e4604045 45 * Functions
mbed_official 49:77c8e4604045 46 *---------------------------------------------------------------------------*/
mbed_official 49:77c8e4604045 47
mbed_official 49:77c8e4604045 48
mbed_official 49:77c8e4604045 49 /*--------------------------- rt_sem_init -----------------------------------*/
mbed_official 49:77c8e4604045 50
mbed_official 49:77c8e4604045 51 void rt_sem_init (OS_ID semaphore, U16 token_count) {
mbed_official 49:77c8e4604045 52 /* Initialize a semaphore */
mbed_official 49:77c8e4604045 53 P_SCB p_SCB = semaphore;
mbed_official 49:77c8e4604045 54
mbed_official 49:77c8e4604045 55 p_SCB->cb_type = SCB;
mbed_official 49:77c8e4604045 56 p_SCB->p_lnk = NULL;
mbed_official 49:77c8e4604045 57 p_SCB->tokens = token_count;
mbed_official 49:77c8e4604045 58 }
mbed_official 49:77c8e4604045 59
mbed_official 49:77c8e4604045 60
mbed_official 49:77c8e4604045 61 /*--------------------------- rt_sem_delete ---------------------------------*/
mbed_official 49:77c8e4604045 62
mbed_official 49:77c8e4604045 63 #ifdef __CMSIS_RTOS
mbed_official 49:77c8e4604045 64 OS_RESULT rt_sem_delete (OS_ID semaphore) {
mbed_official 49:77c8e4604045 65 /* Delete semaphore */
mbed_official 49:77c8e4604045 66 P_SCB p_SCB = semaphore;
mbed_official 49:77c8e4604045 67 P_TCB p_TCB;
mbed_official 49:77c8e4604045 68
mbed_official 49:77c8e4604045 69 while (p_SCB->p_lnk != NULL) {
mbed_official 49:77c8e4604045 70 /* A task is waiting for token */
mbed_official 49:77c8e4604045 71 p_TCB = rt_get_first ((P_XCB)p_SCB);
mbed_official 112:53ace74b190c 72 rt_ret_val(p_TCB, 0U);
mbed_official 49:77c8e4604045 73 rt_rmv_dly(p_TCB);
mbed_official 49:77c8e4604045 74 p_TCB->state = READY;
mbed_official 49:77c8e4604045 75 rt_put_prio (&os_rdy, p_TCB);
mbed_official 49:77c8e4604045 76 }
mbed_official 49:77c8e4604045 77
mbed_official 112:53ace74b190c 78 if ((os_rdy.p_lnk != NULL) && (os_rdy.p_lnk->prio > os_tsk.run->prio)) {
mbed_official 49:77c8e4604045 79 /* preempt running task */
mbed_official 49:77c8e4604045 80 rt_put_prio (&os_rdy, os_tsk.run);
mbed_official 49:77c8e4604045 81 os_tsk.run->state = READY;
mbed_official 49:77c8e4604045 82 rt_dispatch (NULL);
mbed_official 49:77c8e4604045 83 }
mbed_official 49:77c8e4604045 84
mbed_official 112:53ace74b190c 85 p_SCB->cb_type = 0U;
mbed_official 49:77c8e4604045 86
mbed_official 49:77c8e4604045 87 return (OS_R_OK);
mbed_official 49:77c8e4604045 88 }
mbed_official 49:77c8e4604045 89 #endif
mbed_official 49:77c8e4604045 90
mbed_official 49:77c8e4604045 91
mbed_official 49:77c8e4604045 92 /*--------------------------- rt_sem_send -----------------------------------*/
mbed_official 49:77c8e4604045 93
mbed_official 49:77c8e4604045 94 OS_RESULT rt_sem_send (OS_ID semaphore) {
mbed_official 49:77c8e4604045 95 /* Return a token to semaphore */
mbed_official 49:77c8e4604045 96 P_SCB p_SCB = semaphore;
mbed_official 49:77c8e4604045 97 P_TCB p_TCB;
mbed_official 49:77c8e4604045 98
mbed_official 49:77c8e4604045 99 if (p_SCB->p_lnk != NULL) {
mbed_official 49:77c8e4604045 100 /* A task is waiting for token */
mbed_official 49:77c8e4604045 101 p_TCB = rt_get_first ((P_XCB)p_SCB);
mbed_official 49:77c8e4604045 102 #ifdef __CMSIS_RTOS
mbed_official 112:53ace74b190c 103 rt_ret_val(p_TCB, 1U);
mbed_official 49:77c8e4604045 104 #else
mbed_official 49:77c8e4604045 105 rt_ret_val(p_TCB, OS_R_SEM);
mbed_official 49:77c8e4604045 106 #endif
mbed_official 49:77c8e4604045 107 rt_rmv_dly (p_TCB);
mbed_official 49:77c8e4604045 108 rt_dispatch (p_TCB);
mbed_official 49:77c8e4604045 109 }
mbed_official 49:77c8e4604045 110 else {
mbed_official 49:77c8e4604045 111 /* Store token. */
mbed_official 49:77c8e4604045 112 p_SCB->tokens++;
mbed_official 49:77c8e4604045 113 }
mbed_official 49:77c8e4604045 114 return (OS_R_OK);
mbed_official 49:77c8e4604045 115 }
mbed_official 49:77c8e4604045 116
mbed_official 49:77c8e4604045 117
mbed_official 49:77c8e4604045 118 /*--------------------------- rt_sem_wait -----------------------------------*/
mbed_official 49:77c8e4604045 119
mbed_official 49:77c8e4604045 120 OS_RESULT rt_sem_wait (OS_ID semaphore, U16 timeout) {
mbed_official 49:77c8e4604045 121 /* Obtain a token; possibly wait for it */
mbed_official 49:77c8e4604045 122 P_SCB p_SCB = semaphore;
mbed_official 49:77c8e4604045 123
mbed_official 49:77c8e4604045 124 if (p_SCB->tokens) {
mbed_official 49:77c8e4604045 125 p_SCB->tokens--;
mbed_official 49:77c8e4604045 126 return (OS_R_OK);
mbed_official 49:77c8e4604045 127 }
mbed_official 49:77c8e4604045 128 /* No token available: wait for one */
mbed_official 112:53ace74b190c 129 if (timeout == 0U) {
mbed_official 49:77c8e4604045 130 return (OS_R_TMO);
mbed_official 49:77c8e4604045 131 }
mbed_official 49:77c8e4604045 132 if (p_SCB->p_lnk != NULL) {
mbed_official 49:77c8e4604045 133 rt_put_prio ((P_XCB)p_SCB, os_tsk.run);
mbed_official 49:77c8e4604045 134 }
mbed_official 49:77c8e4604045 135 else {
mbed_official 49:77c8e4604045 136 p_SCB->p_lnk = os_tsk.run;
mbed_official 49:77c8e4604045 137 os_tsk.run->p_lnk = NULL;
mbed_official 49:77c8e4604045 138 os_tsk.run->p_rlnk = (P_TCB)p_SCB;
mbed_official 49:77c8e4604045 139 }
mbed_official 49:77c8e4604045 140 rt_block(timeout, WAIT_SEM);
mbed_official 49:77c8e4604045 141 return (OS_R_TMO);
mbed_official 49:77c8e4604045 142 }
mbed_official 49:77c8e4604045 143
mbed_official 49:77c8e4604045 144
mbed_official 49:77c8e4604045 145 /*--------------------------- isr_sem_send ----------------------------------*/
mbed_official 49:77c8e4604045 146
mbed_official 49:77c8e4604045 147 void isr_sem_send (OS_ID semaphore) {
mbed_official 112:53ace74b190c 148 /* Same function as "os_sem_send", but to be called by ISRs */
mbed_official 49:77c8e4604045 149 P_SCB p_SCB = semaphore;
mbed_official 49:77c8e4604045 150
mbed_official 112:53ace74b190c 151 rt_psq_enq (p_SCB, 0U);
mbed_official 49:77c8e4604045 152 rt_psh_req ();
mbed_official 49:77c8e4604045 153 }
mbed_official 49:77c8e4604045 154
mbed_official 49:77c8e4604045 155
mbed_official 49:77c8e4604045 156 /*--------------------------- rt_sem_psh ------------------------------------*/
mbed_official 49:77c8e4604045 157
mbed_official 49:77c8e4604045 158 void rt_sem_psh (P_SCB p_CB) {
mbed_official 49:77c8e4604045 159 /* Check if task has to be waken up */
mbed_official 49:77c8e4604045 160 P_TCB p_TCB;
mbed_official 49:77c8e4604045 161
mbed_official 49:77c8e4604045 162 if (p_CB->p_lnk != NULL) {
mbed_official 49:77c8e4604045 163 /* A task is waiting for token */
mbed_official 49:77c8e4604045 164 p_TCB = rt_get_first ((P_XCB)p_CB);
mbed_official 49:77c8e4604045 165 rt_rmv_dly (p_TCB);
mbed_official 49:77c8e4604045 166 p_TCB->state = READY;
mbed_official 49:77c8e4604045 167 #ifdef __CMSIS_RTOS
mbed_official 112:53ace74b190c 168 rt_ret_val(p_TCB, 1U);
mbed_official 49:77c8e4604045 169 #else
mbed_official 49:77c8e4604045 170 rt_ret_val(p_TCB, OS_R_SEM);
mbed_official 49:77c8e4604045 171 #endif
mbed_official 49:77c8e4604045 172 rt_put_prio (&os_rdy, p_TCB);
mbed_official 49:77c8e4604045 173 }
mbed_official 49:77c8e4604045 174 else {
mbed_official 49:77c8e4604045 175 /* Store token */
mbed_official 49:77c8e4604045 176 p_CB->tokens++;
mbed_official 49:77c8e4604045 177 }
mbed_official 49:77c8e4604045 178 }
mbed_official 49:77c8e4604045 179
mbed_official 49:77c8e4604045 180 /*----------------------------------------------------------------------------
mbed_official 49:77c8e4604045 181 * end of file
mbed_official 49:77c8e4604045 182 *---------------------------------------------------------------------------*/