Austin Blackstone / Mbed 2 deprecated client-lwip-lightswitch-demo-expanded

mbed client lightswitch demo

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of mbed-client-classic-example-lwip by Austin Blackstone

mbed-rtos/rtx/TARGET_CORTEX_A/rt_Semaphore.c@11:cada08fc8a70, 2016-06-09 (annotated)

Committer:
mbedAustin
Date:
Thu Jun 09 17:08:36 2016 +0000
Revision:
11:cada08fc8a70
Commit for public Consumption

Who changed what in which revision?

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mbedAustin 11:cada08fc8a70 1 /*----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 2 * RL-ARM - RTX
mbedAustin 11:cada08fc8a70 3 *----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 4 * Name: RT_SEMAPHORE.C
mbedAustin 11:cada08fc8a70 5 * Purpose: Implements binary and counting semaphores
mbedAustin 11:cada08fc8a70 6 * Rev.: V4.70
mbedAustin 11:cada08fc8a70 7 *----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 8 *
mbedAustin 11:cada08fc8a70 9 * Copyright (c) 1999-2009 KEIL, 2009-2013 ARM Germany GmbH
mbedAustin 11:cada08fc8a70 10 * All rights reserved.
mbedAustin 11:cada08fc8a70 11 * Redistribution and use in source and binary forms, with or without
mbedAustin 11:cada08fc8a70 12 * modification, are permitted provided that the following conditions are met:
mbedAustin 11:cada08fc8a70 13 * - Redistributions of source code must retain the above copyright
mbedAustin 11:cada08fc8a70 14 * notice, this list of conditions and the following disclaimer.
mbedAustin 11:cada08fc8a70 15 * - Redistributions in binary form must reproduce the above copyright
mbedAustin 11:cada08fc8a70 16 * notice, this list of conditions and the following disclaimer in the
mbedAustin 11:cada08fc8a70 17 * documentation and/or other materials provided with the distribution.
mbedAustin 11:cada08fc8a70 18 * - Neither the name of ARM nor the names of its contributors may be used
mbedAustin 11:cada08fc8a70 19 * to endorse or promote products derived from this software without
mbedAustin 11:cada08fc8a70 20 * specific prior written permission.
mbedAustin 11:cada08fc8a70 21 *
mbedAustin 11:cada08fc8a70 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbedAustin 11:cada08fc8a70 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbedAustin 11:cada08fc8a70 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
mbedAustin 11:cada08fc8a70 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
mbedAustin 11:cada08fc8a70 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
mbedAustin 11:cada08fc8a70 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
mbedAustin 11:cada08fc8a70 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbedAustin 11:cada08fc8a70 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbedAustin 11:cada08fc8a70 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
mbedAustin 11:cada08fc8a70 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
mbedAustin 11:cada08fc8a70 32 * POSSIBILITY OF SUCH DAMAGE.
mbedAustin 11:cada08fc8a70 33 *---------------------------------------------------------------------------*/
mbedAustin 11:cada08fc8a70 34
mbedAustin 11:cada08fc8a70 35 #include "rt_TypeDef.h"
mbedAustin 11:cada08fc8a70 36 #include "RTX_Config.h"
mbedAustin 11:cada08fc8a70 37 #include "rt_System.h"
mbedAustin 11:cada08fc8a70 38 #include "rt_List.h"
mbedAustin 11:cada08fc8a70 39 #include "rt_Task.h"
mbedAustin 11:cada08fc8a70 40 #include "rt_Semaphore.h"
mbedAustin 11:cada08fc8a70 41 #ifdef __CORTEX_A9
mbedAustin 11:cada08fc8a70 42 #include "rt_HAL_CA.h"
mbedAustin 11:cada08fc8a70 43 #else
mbedAustin 11:cada08fc8a70 44 #include "rt_HAL_CM.h"
mbedAustin 11:cada08fc8a70 45 #endif
mbedAustin 11:cada08fc8a70 46
mbedAustin 11:cada08fc8a70 47
mbedAustin 11:cada08fc8a70 48 /*----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 49 * Functions
mbedAustin 11:cada08fc8a70 50 *---------------------------------------------------------------------------*/
mbedAustin 11:cada08fc8a70 51
mbedAustin 11:cada08fc8a70 52
mbedAustin 11:cada08fc8a70 53 /*--------------------------- rt_sem_init -----------------------------------*/
mbedAustin 11:cada08fc8a70 54
mbedAustin 11:cada08fc8a70 55 void rt_sem_init (OS_ID semaphore, U16 token_count) {
mbedAustin 11:cada08fc8a70 56 /* Initialize a semaphore */
mbedAustin 11:cada08fc8a70 57 P_SCB p_SCB = semaphore;
mbedAustin 11:cada08fc8a70 58
mbedAustin 11:cada08fc8a70 59 p_SCB->cb_type = SCB;
mbedAustin 11:cada08fc8a70 60 p_SCB->p_lnk = NULL;
mbedAustin 11:cada08fc8a70 61 p_SCB->tokens = token_count;
mbedAustin 11:cada08fc8a70 62 }
mbedAustin 11:cada08fc8a70 63
mbedAustin 11:cada08fc8a70 64
mbedAustin 11:cada08fc8a70 65 /*--------------------------- rt_sem_delete ---------------------------------*/
mbedAustin 11:cada08fc8a70 66
mbedAustin 11:cada08fc8a70 67 #ifdef __CMSIS_RTOS
mbedAustin 11:cada08fc8a70 68 OS_RESULT rt_sem_delete (OS_ID semaphore) {
mbedAustin 11:cada08fc8a70 69 /* Delete semaphore */
mbedAustin 11:cada08fc8a70 70 P_SCB p_SCB = semaphore;
mbedAustin 11:cada08fc8a70 71 P_TCB p_TCB;
mbedAustin 11:cada08fc8a70 72
mbedAustin 11:cada08fc8a70 73 __DMB();
mbedAustin 11:cada08fc8a70 74 while (p_SCB->p_lnk != NULL) {
mbedAustin 11:cada08fc8a70 75 /* A task is waiting for token */
mbedAustin 11:cada08fc8a70 76 p_TCB = rt_get_first ((P_XCB)p_SCB);
mbedAustin 11:cada08fc8a70 77 rt_ret_val(p_TCB, 0);
mbedAustin 11:cada08fc8a70 78 rt_rmv_dly(p_TCB);
mbedAustin 11:cada08fc8a70 79 p_TCB->state = READY;
mbedAustin 11:cada08fc8a70 80 rt_put_prio (&os_rdy, p_TCB);
mbedAustin 11:cada08fc8a70 81 }
mbedAustin 11:cada08fc8a70 82
mbedAustin 11:cada08fc8a70 83 if (os_rdy.p_lnk && (os_rdy.p_lnk->prio > os_tsk.run->prio)) {
mbedAustin 11:cada08fc8a70 84 /* preempt running task */
mbedAustin 11:cada08fc8a70 85 rt_put_prio (&os_rdy, os_tsk.run);
mbedAustin 11:cada08fc8a70 86 os_tsk.run->state = READY;
mbedAustin 11:cada08fc8a70 87 rt_dispatch (NULL);
mbedAustin 11:cada08fc8a70 88 }
mbedAustin 11:cada08fc8a70 89
mbedAustin 11:cada08fc8a70 90 p_SCB->cb_type = 0;
mbedAustin 11:cada08fc8a70 91
mbedAustin 11:cada08fc8a70 92 return (OS_R_OK);
mbedAustin 11:cada08fc8a70 93 }
mbedAustin 11:cada08fc8a70 94 #endif
mbedAustin 11:cada08fc8a70 95
mbedAustin 11:cada08fc8a70 96
mbedAustin 11:cada08fc8a70 97 /*--------------------------- rt_sem_send -----------------------------------*/
mbedAustin 11:cada08fc8a70 98
mbedAustin 11:cada08fc8a70 99 OS_RESULT rt_sem_send (OS_ID semaphore) {
mbedAustin 11:cada08fc8a70 100 /* Return a token to semaphore */
mbedAustin 11:cada08fc8a70 101 P_SCB p_SCB = semaphore;
mbedAustin 11:cada08fc8a70 102 P_TCB p_TCB;
mbedAustin 11:cada08fc8a70 103
mbedAustin 11:cada08fc8a70 104 __DMB();
mbedAustin 11:cada08fc8a70 105 if (p_SCB->p_lnk != NULL) {
mbedAustin 11:cada08fc8a70 106 /* A task is waiting for token */
mbedAustin 11:cada08fc8a70 107 p_TCB = rt_get_first ((P_XCB)p_SCB);
mbedAustin 11:cada08fc8a70 108 #ifdef __CMSIS_RTOS
mbedAustin 11:cada08fc8a70 109 rt_ret_val(p_TCB, 1);
mbedAustin 11:cada08fc8a70 110 #else
mbedAustin 11:cada08fc8a70 111 rt_ret_val(p_TCB, OS_R_SEM);
mbedAustin 11:cada08fc8a70 112 #endif
mbedAustin 11:cada08fc8a70 113 rt_rmv_dly (p_TCB);
mbedAustin 11:cada08fc8a70 114 rt_dispatch (p_TCB);
mbedAustin 11:cada08fc8a70 115 }
mbedAustin 11:cada08fc8a70 116 else {
mbedAustin 11:cada08fc8a70 117 /* Store token. */
mbedAustin 11:cada08fc8a70 118 p_SCB->tokens++;
mbedAustin 11:cada08fc8a70 119 }
mbedAustin 11:cada08fc8a70 120 return (OS_R_OK);
mbedAustin 11:cada08fc8a70 121 }
mbedAustin 11:cada08fc8a70 122
mbedAustin 11:cada08fc8a70 123
mbedAustin 11:cada08fc8a70 124 /*--------------------------- rt_sem_wait -----------------------------------*/
mbedAustin 11:cada08fc8a70 125
mbedAustin 11:cada08fc8a70 126 OS_RESULT rt_sem_wait (OS_ID semaphore, U16 timeout) {
mbedAustin 11:cada08fc8a70 127 /* Obtain a token; possibly wait for it */
mbedAustin 11:cada08fc8a70 128 P_SCB p_SCB = semaphore;
mbedAustin 11:cada08fc8a70 129
mbedAustin 11:cada08fc8a70 130 if (p_SCB->tokens) {
mbedAustin 11:cada08fc8a70 131 p_SCB->tokens--;
mbedAustin 11:cada08fc8a70 132 __DMB();
mbedAustin 11:cada08fc8a70 133 return (OS_R_OK);
mbedAustin 11:cada08fc8a70 134 }
mbedAustin 11:cada08fc8a70 135 /* No token available: wait for one */
mbedAustin 11:cada08fc8a70 136 if (timeout == 0) {
mbedAustin 11:cada08fc8a70 137 return (OS_R_TMO);
mbedAustin 11:cada08fc8a70 138 }
mbedAustin 11:cada08fc8a70 139 if (p_SCB->p_lnk != NULL) {
mbedAustin 11:cada08fc8a70 140 rt_put_prio ((P_XCB)p_SCB, os_tsk.run);
mbedAustin 11:cada08fc8a70 141 }
mbedAustin 11:cada08fc8a70 142 else {
mbedAustin 11:cada08fc8a70 143 p_SCB->p_lnk = os_tsk.run;
mbedAustin 11:cada08fc8a70 144 os_tsk.run->p_lnk = NULL;
mbedAustin 11:cada08fc8a70 145 os_tsk.run->p_rlnk = (P_TCB)p_SCB;
mbedAustin 11:cada08fc8a70 146 }
mbedAustin 11:cada08fc8a70 147 rt_block(timeout, WAIT_SEM);
mbedAustin 11:cada08fc8a70 148 return (OS_R_TMO);
mbedAustin 11:cada08fc8a70 149 }
mbedAustin 11:cada08fc8a70 150
mbedAustin 11:cada08fc8a70 151
mbedAustin 11:cada08fc8a70 152 /*--------------------------- isr_sem_send ----------------------------------*/
mbedAustin 11:cada08fc8a70 153
mbedAustin 11:cada08fc8a70 154 void isr_sem_send (OS_ID semaphore) {
mbedAustin 11:cada08fc8a70 155 /* Same function as "os_sem_send", but to be called by ISRs */
mbedAustin 11:cada08fc8a70 156 P_SCB p_SCB = semaphore;
mbedAustin 11:cada08fc8a70 157
mbedAustin 11:cada08fc8a70 158 rt_psq_enq (p_SCB, 0);
mbedAustin 11:cada08fc8a70 159 rt_psh_req ();
mbedAustin 11:cada08fc8a70 160 }
mbedAustin 11:cada08fc8a70 161
mbedAustin 11:cada08fc8a70 162
mbedAustin 11:cada08fc8a70 163 /*--------------------------- rt_sem_psh ------------------------------------*/
mbedAustin 11:cada08fc8a70 164
mbedAustin 11:cada08fc8a70 165 void rt_sem_psh (P_SCB p_CB) {
mbedAustin 11:cada08fc8a70 166 /* Check if task has to be waken up */
mbedAustin 11:cada08fc8a70 167 P_TCB p_TCB;
mbedAustin 11:cada08fc8a70 168
mbedAustin 11:cada08fc8a70 169 __DMB();
mbedAustin 11:cada08fc8a70 170 if (p_CB->p_lnk != NULL) {
mbedAustin 11:cada08fc8a70 171 /* A task is waiting for token */
mbedAustin 11:cada08fc8a70 172 p_TCB = rt_get_first ((P_XCB)p_CB);
mbedAustin 11:cada08fc8a70 173 rt_rmv_dly (p_TCB);
mbedAustin 11:cada08fc8a70 174 p_TCB->state = READY;
mbedAustin 11:cada08fc8a70 175 #ifdef __CMSIS_RTOS
mbedAustin 11:cada08fc8a70 176 rt_ret_val(p_TCB, 1);
mbedAustin 11:cada08fc8a70 177 #else
mbedAustin 11:cada08fc8a70 178 rt_ret_val(p_TCB, OS_R_SEM);
mbedAustin 11:cada08fc8a70 179 #endif
mbedAustin 11:cada08fc8a70 180 rt_put_prio (&os_rdy, p_TCB);
mbedAustin 11:cada08fc8a70 181 }
mbedAustin 11:cada08fc8a70 182 else {
mbedAustin 11:cada08fc8a70 183 /* Store token */
mbedAustin 11:cada08fc8a70 184 p_CB->tokens++;
mbedAustin 11:cada08fc8a70 185 }
mbedAustin 11:cada08fc8a70 186 }
mbedAustin 11:cada08fc8a70 187
mbedAustin 11:cada08fc8a70 188 /*----------------------------------------------------------------------------
mbedAustin 11:cada08fc8a70 189 * end of file
mbedAustin 11:cada08fc8a70 190 *---------------------------------------------------------------------------*/
mbedAustin 11:cada08fc8a70 191