36372 mbed / Mbed 2 deprecated SP14P1_skeleton

skeleton for lab1

Dependencies:   AvailableMemory mbed-rtos mbed

Fork of helloaabbc by 32314 mbed

mbed-rtos/rtx/rt_Semaphore.c@1:55e99f6e2aa5, 2014-04-04 (annotated)

Committer:
mbed36372
Date:
Fri Apr 04 21:31:22 2014 +0000
Revision:
1:55e99f6e2aa5
Parent:
0:1c8f2727e9f5 
SP14_lab1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
y7jin 0:1c8f2727e9f5 1 /*----------------------------------------------------------------------------
y7jin 0:1c8f2727e9f5 2 * RL-ARM - RTX
y7jin 0:1c8f2727e9f5 3 *----------------------------------------------------------------------------
y7jin 0:1c8f2727e9f5 4 * Name: RT_SEMAPHORE.C
y7jin 0:1c8f2727e9f5 5 * Purpose: Implements binary and counting semaphores
y7jin 0:1c8f2727e9f5 6 * Rev.: V4.60
y7jin 0:1c8f2727e9f5 7 *----------------------------------------------------------------------------
y7jin 0:1c8f2727e9f5 8 *
y7jin 0:1c8f2727e9f5 9 * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
y7jin 0:1c8f2727e9f5 10 * All rights reserved.
y7jin 0:1c8f2727e9f5 11 * Redistribution and use in source and binary forms, with or without
y7jin 0:1c8f2727e9f5 12 * modification, are permitted provided that the following conditions are met:
y7jin 0:1c8f2727e9f5 13 * - Redistributions of source code must retain the above copyright
y7jin 0:1c8f2727e9f5 14 * notice, this list of conditions and the following disclaimer.
y7jin 0:1c8f2727e9f5 15 * - Redistributions in binary form must reproduce the above copyright
y7jin 0:1c8f2727e9f5 16 * notice, this list of conditions and the following disclaimer in the
y7jin 0:1c8f2727e9f5 17 * documentation and/or other materials provided with the distribution.
y7jin 0:1c8f2727e9f5 18 * - Neither the name of ARM nor the names of its contributors may be used
y7jin 0:1c8f2727e9f5 19 * to endorse or promote products derived from this software without
y7jin 0:1c8f2727e9f5 20 * specific prior written permission.
y7jin 0:1c8f2727e9f5 21 *
y7jin 0:1c8f2727e9f5 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
y7jin 0:1c8f2727e9f5 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
y7jin 0:1c8f2727e9f5 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
y7jin 0:1c8f2727e9f5 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
y7jin 0:1c8f2727e9f5 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
y7jin 0:1c8f2727e9f5 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
y7jin 0:1c8f2727e9f5 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
y7jin 0:1c8f2727e9f5 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
y7jin 0:1c8f2727e9f5 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
y7jin 0:1c8f2727e9f5 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
y7jin 0:1c8f2727e9f5 32 * POSSIBILITY OF SUCH DAMAGE.
y7jin 0:1c8f2727e9f5 33 *---------------------------------------------------------------------------*/
y7jin 0:1c8f2727e9f5 34
y7jin 0:1c8f2727e9f5 35 #include "rt_TypeDef.h"
y7jin 0:1c8f2727e9f5 36 #include "RTX_Config.h"
y7jin 0:1c8f2727e9f5 37 #include "rt_System.h"
y7jin 0:1c8f2727e9f5 38 #include "rt_List.h"
y7jin 0:1c8f2727e9f5 39 #include "rt_Task.h"
y7jin 0:1c8f2727e9f5 40 #include "rt_Semaphore.h"
y7jin 0:1c8f2727e9f5 41 #include "rt_HAL_CM.h"
y7jin 0:1c8f2727e9f5 42
y7jin 0:1c8f2727e9f5 43
y7jin 0:1c8f2727e9f5 44 /*----------------------------------------------------------------------------
y7jin 0:1c8f2727e9f5 45 * Functions
y7jin 0:1c8f2727e9f5 46 *---------------------------------------------------------------------------*/
y7jin 0:1c8f2727e9f5 47
y7jin 0:1c8f2727e9f5 48
y7jin 0:1c8f2727e9f5 49 /*--------------------------- rt_sem_init -----------------------------------*/
y7jin 0:1c8f2727e9f5 50
y7jin 0:1c8f2727e9f5 51 void rt_sem_init (OS_ID semaphore, U16 token_count) {
y7jin 0:1c8f2727e9f5 52 /* Initialize a semaphore */
y7jin 0:1c8f2727e9f5 53 P_SCB p_SCB = semaphore;
y7jin 0:1c8f2727e9f5 54
y7jin 0:1c8f2727e9f5 55 p_SCB->cb_type = SCB;
y7jin 0:1c8f2727e9f5 56 p_SCB->p_lnk = NULL;
y7jin 0:1c8f2727e9f5 57 p_SCB->tokens = token_count;
y7jin 0:1c8f2727e9f5 58 }
y7jin 0:1c8f2727e9f5 59
y7jin 0:1c8f2727e9f5 60
y7jin 0:1c8f2727e9f5 61 /*--------------------------- rt_sem_delete ---------------------------------*/
y7jin 0:1c8f2727e9f5 62
y7jin 0:1c8f2727e9f5 63 #ifdef __CMSIS_RTOS
y7jin 0:1c8f2727e9f5 64 OS_RESULT rt_sem_delete (OS_ID semaphore) {
y7jin 0:1c8f2727e9f5 65 /* Delete semaphore */
y7jin 0:1c8f2727e9f5 66 P_SCB p_SCB = semaphore;
y7jin 0:1c8f2727e9f5 67 P_TCB p_TCB;
y7jin 0:1c8f2727e9f5 68
y7jin 0:1c8f2727e9f5 69 while (p_SCB->p_lnk != NULL) {
y7jin 0:1c8f2727e9f5 70 /* A task is waiting for token */
y7jin 0:1c8f2727e9f5 71 p_TCB = rt_get_first ((P_XCB)p_SCB);
y7jin 0:1c8f2727e9f5 72 rt_ret_val(p_TCB, 0);
y7jin 0:1c8f2727e9f5 73 rt_rmv_dly(p_TCB);
y7jin 0:1c8f2727e9f5 74 p_TCB->state = READY;
y7jin 0:1c8f2727e9f5 75 rt_put_prio (&os_rdy, p_TCB);
y7jin 0:1c8f2727e9f5 76 }
y7jin 0:1c8f2727e9f5 77
y7jin 0:1c8f2727e9f5 78 if (os_rdy.p_lnk && (os_rdy.p_lnk->prio > os_tsk.run->prio)) {
y7jin 0:1c8f2727e9f5 79 /* preempt running task */
y7jin 0:1c8f2727e9f5 80 rt_put_prio (&os_rdy, os_tsk.run);
y7jin 0:1c8f2727e9f5 81 os_tsk.run->state = READY;
y7jin 0:1c8f2727e9f5 82 rt_dispatch (NULL);
y7jin 0:1c8f2727e9f5 83 }
y7jin 0:1c8f2727e9f5 84
y7jin 0:1c8f2727e9f5 85 p_SCB->cb_type = 0;
y7jin 0:1c8f2727e9f5 86
y7jin 0:1c8f2727e9f5 87 return (OS_R_OK);
y7jin 0:1c8f2727e9f5 88 }
y7jin 0:1c8f2727e9f5 89 #endif
y7jin 0:1c8f2727e9f5 90
y7jin 0:1c8f2727e9f5 91
y7jin 0:1c8f2727e9f5 92 /*--------------------------- rt_sem_send -----------------------------------*/
y7jin 0:1c8f2727e9f5 93
y7jin 0:1c8f2727e9f5 94 OS_RESULT rt_sem_send (OS_ID semaphore) {
y7jin 0:1c8f2727e9f5 95 /* Return a token to semaphore */
y7jin 0:1c8f2727e9f5 96 P_SCB p_SCB = semaphore;
y7jin 0:1c8f2727e9f5 97 P_TCB p_TCB;
y7jin 0:1c8f2727e9f5 98
y7jin 0:1c8f2727e9f5 99 if (p_SCB->p_lnk != NULL) {
y7jin 0:1c8f2727e9f5 100 /* A task is waiting for token */
y7jin 0:1c8f2727e9f5 101 p_TCB = rt_get_first ((P_XCB)p_SCB);
y7jin 0:1c8f2727e9f5 102 #ifdef __CMSIS_RTOS
y7jin 0:1c8f2727e9f5 103 rt_ret_val(p_TCB, 1);
y7jin 0:1c8f2727e9f5 104 #else
y7jin 0:1c8f2727e9f5 105 rt_ret_val(p_TCB, OS_R_SEM);
y7jin 0:1c8f2727e9f5 106 #endif
y7jin 0:1c8f2727e9f5 107 rt_rmv_dly (p_TCB);
y7jin 0:1c8f2727e9f5 108 rt_dispatch (p_TCB);
y7jin 0:1c8f2727e9f5 109 }
y7jin 0:1c8f2727e9f5 110 else {
y7jin 0:1c8f2727e9f5 111 /* Store token. */
y7jin 0:1c8f2727e9f5 112 p_SCB->tokens++;
y7jin 0:1c8f2727e9f5 113 }
y7jin 0:1c8f2727e9f5 114 return (OS_R_OK);
y7jin 0:1c8f2727e9f5 115 }
y7jin 0:1c8f2727e9f5 116
y7jin 0:1c8f2727e9f5 117
y7jin 0:1c8f2727e9f5 118 /*--------------------------- rt_sem_wait -----------------------------------*/
y7jin 0:1c8f2727e9f5 119
y7jin 0:1c8f2727e9f5 120 OS_RESULT rt_sem_wait (OS_ID semaphore, U16 timeout) {
y7jin 0:1c8f2727e9f5 121 /* Obtain a token; possibly wait for it */
y7jin 0:1c8f2727e9f5 122 P_SCB p_SCB = semaphore;
y7jin 0:1c8f2727e9f5 123
y7jin 0:1c8f2727e9f5 124 if (p_SCB->tokens) {
y7jin 0:1c8f2727e9f5 125 p_SCB->tokens--;
y7jin 0:1c8f2727e9f5 126 return (OS_R_OK);
y7jin 0:1c8f2727e9f5 127 }
y7jin 0:1c8f2727e9f5 128 /* No token available: wait for one */
y7jin 0:1c8f2727e9f5 129 if (timeout == 0) {
y7jin 0:1c8f2727e9f5 130 return (OS_R_TMO);
y7jin 0:1c8f2727e9f5 131 }
y7jin 0:1c8f2727e9f5 132 if (p_SCB->p_lnk != NULL) {
y7jin 0:1c8f2727e9f5 133 rt_put_prio ((P_XCB)p_SCB, os_tsk.run);
y7jin 0:1c8f2727e9f5 134 }
y7jin 0:1c8f2727e9f5 135 else {
y7jin 0:1c8f2727e9f5 136 p_SCB->p_lnk = os_tsk.run;
y7jin 0:1c8f2727e9f5 137 os_tsk.run->p_lnk = NULL;
y7jin 0:1c8f2727e9f5 138 os_tsk.run->p_rlnk = (P_TCB)p_SCB;
y7jin 0:1c8f2727e9f5 139 }
y7jin 0:1c8f2727e9f5 140 rt_block(timeout, WAIT_SEM);
y7jin 0:1c8f2727e9f5 141 return (OS_R_TMO);
y7jin 0:1c8f2727e9f5 142 }
y7jin 0:1c8f2727e9f5 143
y7jin 0:1c8f2727e9f5 144
y7jin 0:1c8f2727e9f5 145 /*--------------------------- isr_sem_send ----------------------------------*/
y7jin 0:1c8f2727e9f5 146
y7jin 0:1c8f2727e9f5 147 void isr_sem_send (OS_ID semaphore) {
y7jin 0:1c8f2727e9f5 148 /* Same function as "os_sem"send", but to be called by ISRs */
y7jin 0:1c8f2727e9f5 149 P_SCB p_SCB = semaphore;
y7jin 0:1c8f2727e9f5 150
y7jin 0:1c8f2727e9f5 151 rt_psq_enq (p_SCB, 0);
y7jin 0:1c8f2727e9f5 152 rt_psh_req ();
y7jin 0:1c8f2727e9f5 153 }
y7jin 0:1c8f2727e9f5 154
y7jin 0:1c8f2727e9f5 155
y7jin 0:1c8f2727e9f5 156 /*--------------------------- rt_sem_psh ------------------------------------*/
y7jin 0:1c8f2727e9f5 157
y7jin 0:1c8f2727e9f5 158 void rt_sem_psh (P_SCB p_CB) {
y7jin 0:1c8f2727e9f5 159 /* Check if task has to be waken up */
y7jin 0:1c8f2727e9f5 160 P_TCB p_TCB;
y7jin 0:1c8f2727e9f5 161
y7jin 0:1c8f2727e9f5 162 if (p_CB->p_lnk != NULL) {
y7jin 0:1c8f2727e9f5 163 /* A task is waiting for token */
y7jin 0:1c8f2727e9f5 164 p_TCB = rt_get_first ((P_XCB)p_CB);
y7jin 0:1c8f2727e9f5 165 rt_rmv_dly (p_TCB);
y7jin 0:1c8f2727e9f5 166 p_TCB->state = READY;
y7jin 0:1c8f2727e9f5 167 #ifdef __CMSIS_RTOS
y7jin 0:1c8f2727e9f5 168 rt_ret_val(p_TCB, 1);
y7jin 0:1c8f2727e9f5 169 #else
y7jin 0:1c8f2727e9f5 170 rt_ret_val(p_TCB, OS_R_SEM);
y7jin 0:1c8f2727e9f5 171 #endif
y7jin 0:1c8f2727e9f5 172 rt_put_prio (&os_rdy, p_TCB);
y7jin 0:1c8f2727e9f5 173 }
y7jin 0:1c8f2727e9f5 174 else {
y7jin 0:1c8f2727e9f5 175 /* Store token */
y7jin 0:1c8f2727e9f5 176 p_CB->tokens++;
y7jin 0:1c8f2727e9f5 177 }
y7jin 0:1c8f2727e9f5 178 }
y7jin 0:1c8f2727e9f5 179
y7jin 0:1c8f2727e9f5 180 /*----------------------------------------------------------------------------
y7jin 0:1c8f2727e9f5 181 * end of file
y7jin 0:1c8f2727e9f5 182 *---------------------------------------------------------------------------*/
y7jin 0:1c8f2727e9f5 183