Alan Ffrench / Mbed 2 deprecated Experiment_2_5

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Dependencies:   mbed

mbed-rtos/rtx/rt_Robin.c@0:52468b19aa21, 2020-07-29 (annotated)

Committer:
alanffrench
Date:
Wed Jul 29 18:51:38 2020 +0000
Revision:
0:52468b19aa21
Threads

Who changed what in which revision?

UserRevisionLine numberNew contents of line
alanffrench 0:52468b19aa21 1 /*----------------------------------------------------------------------------
alanffrench 0:52468b19aa21 2 * RL-ARM - RTX
alanffrench 0:52468b19aa21 3 *----------------------------------------------------------------------------
alanffrench 0:52468b19aa21 4 * Name: RT_ROBIN.C
alanffrench 0:52468b19aa21 5 * Purpose: Round Robin Task switching
alanffrench 0:52468b19aa21 6 * Rev.: V4.60
alanffrench 0:52468b19aa21 7 *----------------------------------------------------------------------------
alanffrench 0:52468b19aa21 8 *
alanffrench 0:52468b19aa21 9 * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
alanffrench 0:52468b19aa21 10 * All rights reserved.
alanffrench 0:52468b19aa21 11 * Redistribution and use in source and binary forms, with or without
alanffrench 0:52468b19aa21 12 * modification, are permitted provided that the following conditions are met:
alanffrench 0:52468b19aa21 13 * - Redistributions of source code must retain the above copyright
alanffrench 0:52468b19aa21 14 * notice, this list of conditions and the following disclaimer.
alanffrench 0:52468b19aa21 15 * - Redistributions in binary form must reproduce the above copyright
alanffrench 0:52468b19aa21 16 * notice, this list of conditions and the following disclaimer in the
alanffrench 0:52468b19aa21 17 * documentation and/or other materials provided with the distribution.
alanffrench 0:52468b19aa21 18 * - Neither the name of ARM nor the names of its contributors may be used
alanffrench 0:52468b19aa21 19 * to endorse or promote products derived from this software without
alanffrench 0:52468b19aa21 20 * specific prior written permission.
alanffrench 0:52468b19aa21 21 *
alanffrench 0:52468b19aa21 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
alanffrench 0:52468b19aa21 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
alanffrench 0:52468b19aa21 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
alanffrench 0:52468b19aa21 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
alanffrench 0:52468b19aa21 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
alanffrench 0:52468b19aa21 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
alanffrench 0:52468b19aa21 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
alanffrench 0:52468b19aa21 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
alanffrench 0:52468b19aa21 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
alanffrench 0:52468b19aa21 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
alanffrench 0:52468b19aa21 32 * POSSIBILITY OF SUCH DAMAGE.
alanffrench 0:52468b19aa21 33 *---------------------------------------------------------------------------*/
alanffrench 0:52468b19aa21 34
alanffrench 0:52468b19aa21 35 #include "rt_TypeDef.h"
alanffrench 0:52468b19aa21 36 #include "RTX_Config.h"
alanffrench 0:52468b19aa21 37 #include "rt_List.h"
alanffrench 0:52468b19aa21 38 #include "rt_Task.h"
alanffrench 0:52468b19aa21 39 #include "rt_Time.h"
alanffrench 0:52468b19aa21 40 #include "rt_Robin.h"
alanffrench 0:52468b19aa21 41 #include "rt_HAL_CM.h"
alanffrench 0:52468b19aa21 42
alanffrench 0:52468b19aa21 43 /*----------------------------------------------------------------------------
alanffrench 0:52468b19aa21 44 * Global Variables
alanffrench 0:52468b19aa21 45 *---------------------------------------------------------------------------*/
alanffrench 0:52468b19aa21 46
alanffrench 0:52468b19aa21 47 struct OS_ROBIN os_robin;
alanffrench 0:52468b19aa21 48
alanffrench 0:52468b19aa21 49
alanffrench 0:52468b19aa21 50 /*----------------------------------------------------------------------------
alanffrench 0:52468b19aa21 51 * Global Functions
alanffrench 0:52468b19aa21 52 *---------------------------------------------------------------------------*/
alanffrench 0:52468b19aa21 53
alanffrench 0:52468b19aa21 54 /*--------------------------- rt_init_robin ---------------------------------*/
alanffrench 0:52468b19aa21 55
alanffrench 0:52468b19aa21 56 __weak void rt_init_robin (void) {
alanffrench 0:52468b19aa21 57 /* Initialize Round Robin variables. */
alanffrench 0:52468b19aa21 58 os_robin.task = NULL;
alanffrench 0:52468b19aa21 59 os_robin.tout = (U16)os_rrobin;
alanffrench 0:52468b19aa21 60 }
alanffrench 0:52468b19aa21 61
alanffrench 0:52468b19aa21 62 /*--------------------------- rt_chk_robin ----------------------------------*/
alanffrench 0:52468b19aa21 63
alanffrench 0:52468b19aa21 64 __weak void rt_chk_robin (void) {
alanffrench 0:52468b19aa21 65 /* Check if Round Robin timeout expired and switch to the next ready task.*/
alanffrench 0:52468b19aa21 66 P_TCB p_new;
alanffrench 0:52468b19aa21 67
alanffrench 0:52468b19aa21 68 if (os_robin.task != os_rdy.p_lnk) {
alanffrench 0:52468b19aa21 69 /* New task was suspended, reset Round Robin timeout. */
alanffrench 0:52468b19aa21 70 os_robin.task = os_rdy.p_lnk;
alanffrench 0:52468b19aa21 71 os_robin.time = (U16)os_time + os_robin.tout - 1;
alanffrench 0:52468b19aa21 72 }
alanffrench 0:52468b19aa21 73 if (os_robin.time == (U16)os_time) {
alanffrench 0:52468b19aa21 74 /* Round Robin timeout has expired, swap Robin tasks. */
alanffrench 0:52468b19aa21 75 os_robin.task = NULL;
alanffrench 0:52468b19aa21 76 p_new = rt_get_first (&os_rdy);
alanffrench 0:52468b19aa21 77 rt_put_prio ((P_XCB)&os_rdy, p_new);
alanffrench 0:52468b19aa21 78 }
alanffrench 0:52468b19aa21 79 }
alanffrench 0:52468b19aa21 80
alanffrench 0:52468b19aa21 81 /*----------------------------------------------------------------------------
alanffrench 0:52468b19aa21 82 * end of file
alanffrench 0:52468b19aa21 83 *---------------------------------------------------------------------------*/
alanffrench 0:52468b19aa21 84