Jonathon Fletcher / rtx

in OS_TSK, rename run as tsk_run and new as tsk_new.

rt_Semaphore.c@0:5f46ebd8588e, 2012-09-02 (annotated)

Committer:
jonathonfletcher
Date:
Sun Sep 02 03:24:20 2012 +0000
Revision:
0:5f46ebd8588e
in OS_TSK, rename run as tsk_run and new as tsk_new.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jonathonfletcher 0:5f46ebd8588e 1 /*----------------------------------------------------------------------------
jonathonfletcher 0:5f46ebd8588e 2 * RL-ARM - RTX
jonathonfletcher 0:5f46ebd8588e 3 *----------------------------------------------------------------------------
jonathonfletcher 0:5f46ebd8588e 4 * Name: RT_SEMAPHORE.C
jonathonfletcher 0:5f46ebd8588e 5 * Purpose: Implements binary and counting semaphores
jonathonfletcher 0:5f46ebd8588e 6 * Rev.: V4.50
jonathonfletcher 0:5f46ebd8588e 7 *----------------------------------------------------------------------------
jonathonfletcher 0:5f46ebd8588e 8 *
jonathonfletcher 0:5f46ebd8588e 9 * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
jonathonfletcher 0:5f46ebd8588e 10 * All rights reserved.
jonathonfletcher 0:5f46ebd8588e 11 * Redistribution and use in source and binary forms, with or without
jonathonfletcher 0:5f46ebd8588e 12 * modification, are permitted provided that the following conditions are met:
jonathonfletcher 0:5f46ebd8588e 13 * - Redistributions of source code must retain the above copyright
jonathonfletcher 0:5f46ebd8588e 14 * notice, this list of conditions and the following disclaimer.
jonathonfletcher 0:5f46ebd8588e 15 * - Redistributions in binary form must reproduce the above copyright
jonathonfletcher 0:5f46ebd8588e 16 * notice, this list of conditions and the following disclaimer in the
jonathonfletcher 0:5f46ebd8588e 17 * documentation and/or other materials provided with the distribution.
jonathonfletcher 0:5f46ebd8588e 18 * - Neither the name of ARM nor the names of its contributors may be used
jonathonfletcher 0:5f46ebd8588e 19 * to endorse or promote products derived from this software without
jonathonfletcher 0:5f46ebd8588e 20 * specific prior written permission.
jonathonfletcher 0:5f46ebd8588e 21 *
jonathonfletcher 0:5f46ebd8588e 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
jonathonfletcher 0:5f46ebd8588e 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
jonathonfletcher 0:5f46ebd8588e 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
jonathonfletcher 0:5f46ebd8588e 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
jonathonfletcher 0:5f46ebd8588e 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
jonathonfletcher 0:5f46ebd8588e 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
jonathonfletcher 0:5f46ebd8588e 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
jonathonfletcher 0:5f46ebd8588e 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
jonathonfletcher 0:5f46ebd8588e 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
jonathonfletcher 0:5f46ebd8588e 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
jonathonfletcher 0:5f46ebd8588e 32 * POSSIBILITY OF SUCH DAMAGE.
jonathonfletcher 0:5f46ebd8588e 33 *---------------------------------------------------------------------------*/
jonathonfletcher 0:5f46ebd8588e 34
jonathonfletcher 0:5f46ebd8588e 35 #include "rt_TypeDef.h"
jonathonfletcher 0:5f46ebd8588e 36 #include "RTX_Config.h"
jonathonfletcher 0:5f46ebd8588e 37 #include "rt_System.h"
jonathonfletcher 0:5f46ebd8588e 38 #include "rt_List.h"
jonathonfletcher 0:5f46ebd8588e 39 #include "rt_Task.h"
jonathonfletcher 0:5f46ebd8588e 40 #include "rt_Semaphore.h"
jonathonfletcher 0:5f46ebd8588e 41 #include "rt_HAL_CM.h"
jonathonfletcher 0:5f46ebd8588e 42
jonathonfletcher 0:5f46ebd8588e 43
jonathonfletcher 0:5f46ebd8588e 44 /*----------------------------------------------------------------------------
jonathonfletcher 0:5f46ebd8588e 45 * Functions
jonathonfletcher 0:5f46ebd8588e 46 *---------------------------------------------------------------------------*/
jonathonfletcher 0:5f46ebd8588e 47
jonathonfletcher 0:5f46ebd8588e 48
jonathonfletcher 0:5f46ebd8588e 49 /*--------------------------- rt_sem_init -----------------------------------*/
jonathonfletcher 0:5f46ebd8588e 50
jonathonfletcher 0:5f46ebd8588e 51 void rt_sem_init (OS_ID semaphore, U16 token_count) {
jonathonfletcher 0:5f46ebd8588e 52 /* Initialize a semaphore */
jonathonfletcher 0:5f46ebd8588e 53 P_SCB p_SCB = semaphore;
jonathonfletcher 0:5f46ebd8588e 54
jonathonfletcher 0:5f46ebd8588e 55 p_SCB->cb_type = SCB;
jonathonfletcher 0:5f46ebd8588e 56 p_SCB->p_lnk = NULL;
jonathonfletcher 0:5f46ebd8588e 57 p_SCB->tokens = token_count;
jonathonfletcher 0:5f46ebd8588e 58 }
jonathonfletcher 0:5f46ebd8588e 59
jonathonfletcher 0:5f46ebd8588e 60
jonathonfletcher 0:5f46ebd8588e 61 /*--------------------------- rt_sem_delete ---------------------------------*/
jonathonfletcher 0:5f46ebd8588e 62 OS_RESULT rt_sem_delete (OS_ID semaphore) {
jonathonfletcher 0:5f46ebd8588e 63 /* Delete semaphore */
jonathonfletcher 0:5f46ebd8588e 64 P_SCB p_SCB = semaphore;
jonathonfletcher 0:5f46ebd8588e 65 P_TCB p_TCB;
jonathonfletcher 0:5f46ebd8588e 66
jonathonfletcher 0:5f46ebd8588e 67 while (p_SCB->p_lnk != NULL) {
jonathonfletcher 0:5f46ebd8588e 68 /* A task is waiting for token */
jonathonfletcher 0:5f46ebd8588e 69 p_TCB = rt_get_first ((P_XCB)p_SCB);
jonathonfletcher 0:5f46ebd8588e 70 rt_ret_val(p_TCB, 0);
jonathonfletcher 0:5f46ebd8588e 71 rt_rmv_dly(p_TCB);
jonathonfletcher 0:5f46ebd8588e 72 p_TCB->state = READY;
jonathonfletcher 0:5f46ebd8588e 73 rt_put_prio (&os_rdy, p_TCB);
jonathonfletcher 0:5f46ebd8588e 74 }
jonathonfletcher 0:5f46ebd8588e 75
jonathonfletcher 0:5f46ebd8588e 76 if (os_rdy.p_lnk && (os_rdy.p_lnk->prio > os_tsk.tsk_run->prio)) {
jonathonfletcher 0:5f46ebd8588e 77 /* preempt running task */
jonathonfletcher 0:5f46ebd8588e 78 rt_put_prio (&os_rdy, os_tsk.tsk_run);
jonathonfletcher 0:5f46ebd8588e 79 os_tsk.tsk_run->state = READY;
jonathonfletcher 0:5f46ebd8588e 80 rt_dispatch (NULL);
jonathonfletcher 0:5f46ebd8588e 81 }
jonathonfletcher 0:5f46ebd8588e 82
jonathonfletcher 0:5f46ebd8588e 83 p_SCB->cb_type = 0;
jonathonfletcher 0:5f46ebd8588e 84
jonathonfletcher 0:5f46ebd8588e 85 return (OS_R_OK);
jonathonfletcher 0:5f46ebd8588e 86 }
jonathonfletcher 0:5f46ebd8588e 87
jonathonfletcher 0:5f46ebd8588e 88 /*--------------------------- rt_sem_send -----------------------------------*/
jonathonfletcher 0:5f46ebd8588e 89
jonathonfletcher 0:5f46ebd8588e 90 OS_RESULT rt_sem_send (OS_ID semaphore) {
jonathonfletcher 0:5f46ebd8588e 91 /* Return a token to semaphore */
jonathonfletcher 0:5f46ebd8588e 92 P_SCB p_SCB = semaphore;
jonathonfletcher 0:5f46ebd8588e 93 P_TCB p_TCB;
jonathonfletcher 0:5f46ebd8588e 94
jonathonfletcher 0:5f46ebd8588e 95 if (p_SCB->p_lnk != NULL) {
jonathonfletcher 0:5f46ebd8588e 96 /* A task is waiting for token */
jonathonfletcher 0:5f46ebd8588e 97 p_TCB = rt_get_first ((P_XCB)p_SCB);
jonathonfletcher 0:5f46ebd8588e 98 rt_ret_val(p_TCB, 1);
jonathonfletcher 0:5f46ebd8588e 99 rt_rmv_dly (p_TCB);
jonathonfletcher 0:5f46ebd8588e 100 rt_dispatch (p_TCB);
jonathonfletcher 0:5f46ebd8588e 101 }
jonathonfletcher 0:5f46ebd8588e 102 else {
jonathonfletcher 0:5f46ebd8588e 103 /* Store token. */
jonathonfletcher 0:5f46ebd8588e 104 p_SCB->tokens++;
jonathonfletcher 0:5f46ebd8588e 105 }
jonathonfletcher 0:5f46ebd8588e 106 return (OS_R_OK);
jonathonfletcher 0:5f46ebd8588e 107 }
jonathonfletcher 0:5f46ebd8588e 108
jonathonfletcher 0:5f46ebd8588e 109
jonathonfletcher 0:5f46ebd8588e 110 /*--------------------------- rt_sem_wait -----------------------------------*/
jonathonfletcher 0:5f46ebd8588e 111
jonathonfletcher 0:5f46ebd8588e 112 OS_RESULT rt_sem_wait (OS_ID semaphore, U16 timeout) {
jonathonfletcher 0:5f46ebd8588e 113 /* Obtain a token; possibly wait for it */
jonathonfletcher 0:5f46ebd8588e 114 P_SCB p_SCB = semaphore;
jonathonfletcher 0:5f46ebd8588e 115
jonathonfletcher 0:5f46ebd8588e 116 if (p_SCB->tokens) {
jonathonfletcher 0:5f46ebd8588e 117 p_SCB->tokens--;
jonathonfletcher 0:5f46ebd8588e 118 return (OS_R_OK);
jonathonfletcher 0:5f46ebd8588e 119 }
jonathonfletcher 0:5f46ebd8588e 120 /* No token available: wait for one */
jonathonfletcher 0:5f46ebd8588e 121 if (timeout == 0) {
jonathonfletcher 0:5f46ebd8588e 122 return (OS_R_TMO);
jonathonfletcher 0:5f46ebd8588e 123 }
jonathonfletcher 0:5f46ebd8588e 124 if (p_SCB->p_lnk != NULL) {
jonathonfletcher 0:5f46ebd8588e 125 rt_put_prio ((P_XCB)p_SCB, os_tsk.tsk_run);
jonathonfletcher 0:5f46ebd8588e 126 }
jonathonfletcher 0:5f46ebd8588e 127 else {
jonathonfletcher 0:5f46ebd8588e 128 p_SCB->p_lnk = os_tsk.tsk_run;
jonathonfletcher 0:5f46ebd8588e 129 os_tsk.tsk_run->p_lnk = NULL;
jonathonfletcher 0:5f46ebd8588e 130 os_tsk.tsk_run->p_rlnk = (P_TCB)p_SCB;
jonathonfletcher 0:5f46ebd8588e 131 }
jonathonfletcher 0:5f46ebd8588e 132 rt_block(timeout, WAIT_SEM);
jonathonfletcher 0:5f46ebd8588e 133 return (OS_R_TMO);
jonathonfletcher 0:5f46ebd8588e 134 }
jonathonfletcher 0:5f46ebd8588e 135
jonathonfletcher 0:5f46ebd8588e 136
jonathonfletcher 0:5f46ebd8588e 137 /*--------------------------- isr_sem_send ----------------------------------*/
jonathonfletcher 0:5f46ebd8588e 138
jonathonfletcher 0:5f46ebd8588e 139 void isr_sem_send (OS_ID semaphore) {
jonathonfletcher 0:5f46ebd8588e 140 /* Same function as "os_sem"send", but to be called by ISRs */
jonathonfletcher 0:5f46ebd8588e 141 P_SCB p_SCB = semaphore;
jonathonfletcher 0:5f46ebd8588e 142
jonathonfletcher 0:5f46ebd8588e 143 rt_psq_enq (p_SCB, 0);
jonathonfletcher 0:5f46ebd8588e 144 rt_psh_req ();
jonathonfletcher 0:5f46ebd8588e 145 }
jonathonfletcher 0:5f46ebd8588e 146
jonathonfletcher 0:5f46ebd8588e 147
jonathonfletcher 0:5f46ebd8588e 148 /*--------------------------- rt_sem_psh ------------------------------------*/
jonathonfletcher 0:5f46ebd8588e 149
jonathonfletcher 0:5f46ebd8588e 150 void rt_sem_psh (P_SCB p_CB) {
jonathonfletcher 0:5f46ebd8588e 151 /* Check if task has to be waken up */
jonathonfletcher 0:5f46ebd8588e 152 P_TCB p_TCB;
jonathonfletcher 0:5f46ebd8588e 153
jonathonfletcher 0:5f46ebd8588e 154 if (p_CB->p_lnk != NULL) {
jonathonfletcher 0:5f46ebd8588e 155 /* A task is waiting for token */
jonathonfletcher 0:5f46ebd8588e 156 p_TCB = rt_get_first ((P_XCB)p_CB);
jonathonfletcher 0:5f46ebd8588e 157 rt_rmv_dly (p_TCB);
jonathonfletcher 0:5f46ebd8588e 158 p_TCB->state = READY;
jonathonfletcher 0:5f46ebd8588e 159 rt_ret_val(p_TCB, 1);
jonathonfletcher 0:5f46ebd8588e 160 rt_put_prio (&os_rdy, p_TCB);
jonathonfletcher 0:5f46ebd8588e 161 }
jonathonfletcher 0:5f46ebd8588e 162 else {
jonathonfletcher 0:5f46ebd8588e 163 /* Store token */
jonathonfletcher 0:5f46ebd8588e 164 p_CB->tokens++;
jonathonfletcher 0:5f46ebd8588e 165 }
jonathonfletcher 0:5f46ebd8588e 166 }
jonathonfletcher 0:5f46ebd8588e 167
jonathonfletcher 0:5f46ebd8588e 168 /*----------------------------------------------------------------------------
jonathonfletcher 0:5f46ebd8588e 169 * end of file
jonathonfletcher 0:5f46ebd8588e 170 *---------------------------------------------------------------------------*/
jonathonfletcher 0:5f46ebd8588e 171