Samantha Wang / MbedModules

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Dependencies:   SDFileSystem TextLCD mbed-rtos mbed wave_player FATFileSystem

MbedModules/mbed-rtos/rtx/rt_Semaphore.c@0:6dff7b3b161d, 2014-12-26 (annotated)

Committer:
ywang627
Date:
Fri Dec 26 13:38:44 2014 +0000
Revision:
0:6dff7b3b161d
Battleship Game

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ywang627 0:6dff7b3b161d 1 /*----------------------------------------------------------------------------
ywang627 0:6dff7b3b161d 2 * RL-ARM - RTX
ywang627 0:6dff7b3b161d 3 *----------------------------------------------------------------------------
ywang627 0:6dff7b3b161d 4 * Name: RT_SEMAPHORE.C
ywang627 0:6dff7b3b161d 5 * Purpose: Implements binary and counting semaphores
ywang627 0:6dff7b3b161d 6 * Rev.: V4.60
ywang627 0:6dff7b3b161d 7 *----------------------------------------------------------------------------
ywang627 0:6dff7b3b161d 8 *
ywang627 0:6dff7b3b161d 9 * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
ywang627 0:6dff7b3b161d 10 * All rights reserved.
ywang627 0:6dff7b3b161d 11 * Redistribution and use in source and binary forms, with or without
ywang627 0:6dff7b3b161d 12 * modification, are permitted provided that the following conditions are met:
ywang627 0:6dff7b3b161d 13 * - Redistributions of source code must retain the above copyright
ywang627 0:6dff7b3b161d 14 * notice, this list of conditions and the following disclaimer.
ywang627 0:6dff7b3b161d 15 * - Redistributions in binary form must reproduce the above copyright
ywang627 0:6dff7b3b161d 16 * notice, this list of conditions and the following disclaimer in the
ywang627 0:6dff7b3b161d 17 * documentation and/or other materials provided with the distribution.
ywang627 0:6dff7b3b161d 18 * - Neither the name of ARM nor the names of its contributors may be used
ywang627 0:6dff7b3b161d 19 * to endorse or promote products derived from this software without
ywang627 0:6dff7b3b161d 20 * specific prior written permission.
ywang627 0:6dff7b3b161d 21 *
ywang627 0:6dff7b3b161d 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
ywang627 0:6dff7b3b161d 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ywang627 0:6dff7b3b161d 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ywang627 0:6dff7b3b161d 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
ywang627 0:6dff7b3b161d 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
ywang627 0:6dff7b3b161d 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
ywang627 0:6dff7b3b161d 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
ywang627 0:6dff7b3b161d 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
ywang627 0:6dff7b3b161d 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ywang627 0:6dff7b3b161d 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
ywang627 0:6dff7b3b161d 32 * POSSIBILITY OF SUCH DAMAGE.
ywang627 0:6dff7b3b161d 33 *---------------------------------------------------------------------------*/
ywang627 0:6dff7b3b161d 34
ywang627 0:6dff7b3b161d 35 #include "rt_TypeDef.h"
ywang627 0:6dff7b3b161d 36 #include "RTX_Config.h"
ywang627 0:6dff7b3b161d 37 #include "rt_System.h"
ywang627 0:6dff7b3b161d 38 #include "rt_List.h"
ywang627 0:6dff7b3b161d 39 #include "rt_Task.h"
ywang627 0:6dff7b3b161d 40 #include "rt_Semaphore.h"
ywang627 0:6dff7b3b161d 41 #include "rt_HAL_CM.h"
ywang627 0:6dff7b3b161d 42
ywang627 0:6dff7b3b161d 43
ywang627 0:6dff7b3b161d 44 /*----------------------------------------------------------------------------
ywang627 0:6dff7b3b161d 45 * Functions
ywang627 0:6dff7b3b161d 46 *---------------------------------------------------------------------------*/
ywang627 0:6dff7b3b161d 47
ywang627 0:6dff7b3b161d 48
ywang627 0:6dff7b3b161d 49 /*--------------------------- rt_sem_init -----------------------------------*/
ywang627 0:6dff7b3b161d 50
ywang627 0:6dff7b3b161d 51 void rt_sem_init (OS_ID semaphore, U16 token_count) {
ywang627 0:6dff7b3b161d 52 /* Initialize a semaphore */
ywang627 0:6dff7b3b161d 53 P_SCB p_SCB = semaphore;
ywang627 0:6dff7b3b161d 54
ywang627 0:6dff7b3b161d 55 p_SCB->cb_type = SCB;
ywang627 0:6dff7b3b161d 56 p_SCB->p_lnk = NULL;
ywang627 0:6dff7b3b161d 57 p_SCB->tokens = token_count;
ywang627 0:6dff7b3b161d 58 }
ywang627 0:6dff7b3b161d 59
ywang627 0:6dff7b3b161d 60
ywang627 0:6dff7b3b161d 61 /*--------------------------- rt_sem_delete ---------------------------------*/
ywang627 0:6dff7b3b161d 62
ywang627 0:6dff7b3b161d 63 #ifdef __CMSIS_RTOS
ywang627 0:6dff7b3b161d 64 OS_RESULT rt_sem_delete (OS_ID semaphore) {
ywang627 0:6dff7b3b161d 65 /* Delete semaphore */
ywang627 0:6dff7b3b161d 66 P_SCB p_SCB = semaphore;
ywang627 0:6dff7b3b161d 67 P_TCB p_TCB;
ywang627 0:6dff7b3b161d 68
ywang627 0:6dff7b3b161d 69 while (p_SCB->p_lnk != NULL) {
ywang627 0:6dff7b3b161d 70 /* A task is waiting for token */
ywang627 0:6dff7b3b161d 71 p_TCB = rt_get_first ((P_XCB)p_SCB);
ywang627 0:6dff7b3b161d 72 rt_ret_val(p_TCB, 0);
ywang627 0:6dff7b3b161d 73 rt_rmv_dly(p_TCB);
ywang627 0:6dff7b3b161d 74 p_TCB->state = READY;
ywang627 0:6dff7b3b161d 75 rt_put_prio (&os_rdy, p_TCB);
ywang627 0:6dff7b3b161d 76 }
ywang627 0:6dff7b3b161d 77
ywang627 0:6dff7b3b161d 78 if (os_rdy.p_lnk && (os_rdy.p_lnk->prio > os_tsk.run->prio)) {
ywang627 0:6dff7b3b161d 79 /* preempt running task */
ywang627 0:6dff7b3b161d 80 rt_put_prio (&os_rdy, os_tsk.run);
ywang627 0:6dff7b3b161d 81 os_tsk.run->state = READY;
ywang627 0:6dff7b3b161d 82 rt_dispatch (NULL);
ywang627 0:6dff7b3b161d 83 }
ywang627 0:6dff7b3b161d 84
ywang627 0:6dff7b3b161d 85 p_SCB->cb_type = 0;
ywang627 0:6dff7b3b161d 86
ywang627 0:6dff7b3b161d 87 return (OS_R_OK);
ywang627 0:6dff7b3b161d 88 }
ywang627 0:6dff7b3b161d 89 #endif
ywang627 0:6dff7b3b161d 90
ywang627 0:6dff7b3b161d 91
ywang627 0:6dff7b3b161d 92 /*--------------------------- rt_sem_send -----------------------------------*/
ywang627 0:6dff7b3b161d 93
ywang627 0:6dff7b3b161d 94 OS_RESULT rt_sem_send (OS_ID semaphore) {
ywang627 0:6dff7b3b161d 95 /* Return a token to semaphore */
ywang627 0:6dff7b3b161d 96 P_SCB p_SCB = semaphore;
ywang627 0:6dff7b3b161d 97 P_TCB p_TCB;
ywang627 0:6dff7b3b161d 98
ywang627 0:6dff7b3b161d 99 if (p_SCB->p_lnk != NULL) {
ywang627 0:6dff7b3b161d 100 /* A task is waiting for token */
ywang627 0:6dff7b3b161d 101 p_TCB = rt_get_first ((P_XCB)p_SCB);
ywang627 0:6dff7b3b161d 102 #ifdef __CMSIS_RTOS
ywang627 0:6dff7b3b161d 103 rt_ret_val(p_TCB, 1);
ywang627 0:6dff7b3b161d 104 #else
ywang627 0:6dff7b3b161d 105 rt_ret_val(p_TCB, OS_R_SEM);
ywang627 0:6dff7b3b161d 106 #endif
ywang627 0:6dff7b3b161d 107 rt_rmv_dly (p_TCB);
ywang627 0:6dff7b3b161d 108 rt_dispatch (p_TCB);
ywang627 0:6dff7b3b161d 109 }
ywang627 0:6dff7b3b161d 110 else {
ywang627 0:6dff7b3b161d 111 /* Store token. */
ywang627 0:6dff7b3b161d 112 p_SCB->tokens++;
ywang627 0:6dff7b3b161d 113 }
ywang627 0:6dff7b3b161d 114 return (OS_R_OK);
ywang627 0:6dff7b3b161d 115 }
ywang627 0:6dff7b3b161d 116
ywang627 0:6dff7b3b161d 117
ywang627 0:6dff7b3b161d 118 /*--------------------------- rt_sem_wait -----------------------------------*/
ywang627 0:6dff7b3b161d 119
ywang627 0:6dff7b3b161d 120 OS_RESULT rt_sem_wait (OS_ID semaphore, U16 timeout) {
ywang627 0:6dff7b3b161d 121 /* Obtain a token; possibly wait for it */
ywang627 0:6dff7b3b161d 122 P_SCB p_SCB = semaphore;
ywang627 0:6dff7b3b161d 123
ywang627 0:6dff7b3b161d 124 if (p_SCB->tokens) {
ywang627 0:6dff7b3b161d 125 p_SCB->tokens--;
ywang627 0:6dff7b3b161d 126 return (OS_R_OK);
ywang627 0:6dff7b3b161d 127 }
ywang627 0:6dff7b3b161d 128 /* No token available: wait for one */
ywang627 0:6dff7b3b161d 129 if (timeout == 0) {
ywang627 0:6dff7b3b161d 130 return (OS_R_TMO);
ywang627 0:6dff7b3b161d 131 }
ywang627 0:6dff7b3b161d 132 if (p_SCB->p_lnk != NULL) {
ywang627 0:6dff7b3b161d 133 rt_put_prio ((P_XCB)p_SCB, os_tsk.run);
ywang627 0:6dff7b3b161d 134 }
ywang627 0:6dff7b3b161d 135 else {
ywang627 0:6dff7b3b161d 136 p_SCB->p_lnk = os_tsk.run;
ywang627 0:6dff7b3b161d 137 os_tsk.run->p_lnk = NULL;
ywang627 0:6dff7b3b161d 138 os_tsk.run->p_rlnk = (P_TCB)p_SCB;
ywang627 0:6dff7b3b161d 139 }
ywang627 0:6dff7b3b161d 140 rt_block(timeout, WAIT_SEM);
ywang627 0:6dff7b3b161d 141 return (OS_R_TMO);
ywang627 0:6dff7b3b161d 142 }
ywang627 0:6dff7b3b161d 143
ywang627 0:6dff7b3b161d 144
ywang627 0:6dff7b3b161d 145 /*--------------------------- isr_sem_send ----------------------------------*/
ywang627 0:6dff7b3b161d 146
ywang627 0:6dff7b3b161d 147 void isr_sem_send (OS_ID semaphore) {
ywang627 0:6dff7b3b161d 148 /* Same function as "os_sem"send", but to be called by ISRs */
ywang627 0:6dff7b3b161d 149 P_SCB p_SCB = semaphore;
ywang627 0:6dff7b3b161d 150
ywang627 0:6dff7b3b161d 151 rt_psq_enq (p_SCB, 0);
ywang627 0:6dff7b3b161d 152 rt_psh_req ();
ywang627 0:6dff7b3b161d 153 }
ywang627 0:6dff7b3b161d 154
ywang627 0:6dff7b3b161d 155
ywang627 0:6dff7b3b161d 156 /*--------------------------- rt_sem_psh ------------------------------------*/
ywang627 0:6dff7b3b161d 157
ywang627 0:6dff7b3b161d 158 void rt_sem_psh (P_SCB p_CB) {
ywang627 0:6dff7b3b161d 159 /* Check if task has to be waken up */
ywang627 0:6dff7b3b161d 160 P_TCB p_TCB;
ywang627 0:6dff7b3b161d 161
ywang627 0:6dff7b3b161d 162 if (p_CB->p_lnk != NULL) {
ywang627 0:6dff7b3b161d 163 /* A task is waiting for token */
ywang627 0:6dff7b3b161d 164 p_TCB = rt_get_first ((P_XCB)p_CB);
ywang627 0:6dff7b3b161d 165 rt_rmv_dly (p_TCB);
ywang627 0:6dff7b3b161d 166 p_TCB->state = READY;
ywang627 0:6dff7b3b161d 167 #ifdef __CMSIS_RTOS
ywang627 0:6dff7b3b161d 168 rt_ret_val(p_TCB, 1);
ywang627 0:6dff7b3b161d 169 #else
ywang627 0:6dff7b3b161d 170 rt_ret_val(p_TCB, OS_R_SEM);
ywang627 0:6dff7b3b161d 171 #endif
ywang627 0:6dff7b3b161d 172 rt_put_prio (&os_rdy, p_TCB);
ywang627 0:6dff7b3b161d 173 }
ywang627 0:6dff7b3b161d 174 else {
ywang627 0:6dff7b3b161d 175 /* Store token */
ywang627 0:6dff7b3b161d 176 p_CB->tokens++;
ywang627 0:6dff7b3b161d 177 }
ywang627 0:6dff7b3b161d 178 }
ywang627 0:6dff7b3b161d 179
ywang627 0:6dff7b3b161d 180 /*----------------------------------------------------------------------------
ywang627 0:6dff7b3b161d 181 * end of file
ywang627 0:6dff7b3b161d 182 *---------------------------------------------------------------------------*/
ywang627 0:6dff7b3b161d 183