A S / mbed-rtos

mbed rtos - modified for the final project of the course "Advanced Operating Systems"

Dependents:   aos_mbed

Fork of mbed-rtos by mbed official

rtx/rt_Robin.c@11:db1fc233faa9, 2013-04-30 (annotated)

Committer:
emilmont
Date:
Tue Apr 30 10:51:19 2013 +0000
Revision:
11:db1fc233faa9
Parent:
6:350b53afb889 
In the Keil MDK toolchain "RTX_Config.h" is a special system library header file

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 6:350b53afb889 1 /*----------------------------------------------------------------------------
emilmont 6:350b53afb889 2 * RL-ARM - RTX
emilmont 6:350b53afb889 3 *----------------------------------------------------------------------------
emilmont 6:350b53afb889 4 * Name: RT_ROBIN.C
emilmont 6:350b53afb889 5 * Purpose: Round Robin Task switching
emilmont 6:350b53afb889 6 * Rev.: V4.60
emilmont 6:350b53afb889 7 *----------------------------------------------------------------------------
emilmont 6:350b53afb889 8 *
emilmont 6:350b53afb889 9 * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
emilmont 6:350b53afb889 10 * All rights reserved.
emilmont 6:350b53afb889 11 * Redistribution and use in source and binary forms, with or without
emilmont 6:350b53afb889 12 * modification, are permitted provided that the following conditions are met:
emilmont 6:350b53afb889 13 * - Redistributions of source code must retain the above copyright
emilmont 6:350b53afb889 14 * notice, this list of conditions and the following disclaimer.
emilmont 6:350b53afb889 15 * - Redistributions in binary form must reproduce the above copyright
emilmont 6:350b53afb889 16 * notice, this list of conditions and the following disclaimer in the
emilmont 6:350b53afb889 17 * documentation and/or other materials provided with the distribution.
emilmont 6:350b53afb889 18 * - Neither the name of ARM nor the names of its contributors may be used
emilmont 6:350b53afb889 19 * to endorse or promote products derived from this software without
emilmont 6:350b53afb889 20 * specific prior written permission.
emilmont 6:350b53afb889 21 *
emilmont 6:350b53afb889 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
emilmont 6:350b53afb889 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
emilmont 6:350b53afb889 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
emilmont 6:350b53afb889 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
emilmont 6:350b53afb889 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
emilmont 6:350b53afb889 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
emilmont 6:350b53afb889 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
emilmont 6:350b53afb889 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
emilmont 6:350b53afb889 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
emilmont 6:350b53afb889 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
emilmont 6:350b53afb889 32 * POSSIBILITY OF SUCH DAMAGE.
emilmont 6:350b53afb889 33 *---------------------------------------------------------------------------*/
emilmont 6:350b53afb889 34
emilmont 6:350b53afb889 35 #include "rt_TypeDef.h"
emilmont 11:db1fc233faa9 36 #include "RTX_Conf.h"
emilmont 6:350b53afb889 37 #include "rt_List.h"
emilmont 6:350b53afb889 38 #include "rt_Task.h"
emilmont 6:350b53afb889 39 #include "rt_Time.h"
emilmont 6:350b53afb889 40 #include "rt_Robin.h"
emilmont 6:350b53afb889 41 #include "rt_HAL_CM.h"
emilmont 6:350b53afb889 42
emilmont 6:350b53afb889 43 /*----------------------------------------------------------------------------
emilmont 6:350b53afb889 44 * Global Variables
emilmont 6:350b53afb889 45 *---------------------------------------------------------------------------*/
emilmont 6:350b53afb889 46
emilmont 6:350b53afb889 47 struct OS_ROBIN os_robin;
emilmont 6:350b53afb889 48
emilmont 6:350b53afb889 49
emilmont 6:350b53afb889 50 /*----------------------------------------------------------------------------
emilmont 6:350b53afb889 51 * Global Functions
emilmont 6:350b53afb889 52 *---------------------------------------------------------------------------*/
emilmont 6:350b53afb889 53
emilmont 6:350b53afb889 54 /*--------------------------- rt_init_robin ---------------------------------*/
emilmont 6:350b53afb889 55
emilmont 6:350b53afb889 56 __weak void rt_init_robin (void) {
emilmont 6:350b53afb889 57 /* Initialize Round Robin variables. */
emilmont 6:350b53afb889 58 os_robin.task = NULL;
emilmont 6:350b53afb889 59 os_robin.tout = (U16)os_rrobin;
emilmont 6:350b53afb889 60 }
emilmont 6:350b53afb889 61
emilmont 6:350b53afb889 62 /*--------------------------- rt_chk_robin ----------------------------------*/
emilmont 6:350b53afb889 63
emilmont 6:350b53afb889 64 __weak void rt_chk_robin (void) {
emilmont 6:350b53afb889 65 /* Check if Round Robin timeout expired and switch to the next ready task.*/
emilmont 6:350b53afb889 66 P_TCB p_new;
emilmont 6:350b53afb889 67
emilmont 6:350b53afb889 68 if (os_robin.task != os_rdy.p_lnk) {
emilmont 6:350b53afb889 69 /* New task was suspended, reset Round Robin timeout. */
emilmont 6:350b53afb889 70 os_robin.task = os_rdy.p_lnk;
emilmont 6:350b53afb889 71 os_robin.time = (U16)os_time + os_robin.tout - 1;
emilmont 6:350b53afb889 72 }
emilmont 6:350b53afb889 73 if (os_robin.time == (U16)os_time) {
emilmont 6:350b53afb889 74 /* Round Robin timeout has expired, swap Robin tasks. */
emilmont 6:350b53afb889 75 os_robin.task = NULL;
emilmont 6:350b53afb889 76 p_new = rt_get_first (&os_rdy);
emilmont 6:350b53afb889 77 rt_put_prio ((P_XCB)&os_rdy, p_new);
emilmont 6:350b53afb889 78 }
emilmont 6:350b53afb889 79 }
emilmont 6:350b53afb889 80
emilmont 6:350b53afb889 81 /*----------------------------------------------------------------------------
emilmont 6:350b53afb889 82 * end of file
emilmont 6:350b53afb889 83 *---------------------------------------------------------------------------*/
emilmont 6:350b53afb889 84