84 lines
3.6 KiB
C
84 lines
3.6 KiB
C
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/*----------------------------------------------------------------------------
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* CMSIS-RTOS - RTX
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*----------------------------------------------------------------------------
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* Name: RT_ROBIN.C
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* Purpose: Round Robin Task switching
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* Rev.: V4.79
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*----------------------------------------------------------------------------
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*
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* Copyright (c) 1999-2009 KEIL, 2009-2015 ARM Germany GmbH
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* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*---------------------------------------------------------------------------*/
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#include "rt_TypeDef.h"
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#include "RTX_Config.h"
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#include "rt_List.h"
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#include "rt_Task.h"
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#include "rt_Time.h"
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#include "rt_Robin.h"
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#include "rt_HAL_CM.h"
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/*----------------------------------------------------------------------------
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* Global Variables
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*---------------------------------------------------------------------------*/
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struct OS_ROBIN os_robin;
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/*----------------------------------------------------------------------------
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* Global Functions
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*---------------------------------------------------------------------------*/
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/*--------------------------- rt_init_robin ---------------------------------*/
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__weak void rt_init_robin (void) {
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/* Initialize Round Robin variables. */
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os_robin.task = NULL;
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os_robin.tout = (U16)os_rrobin;
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}
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/*--------------------------- rt_chk_robin ----------------------------------*/
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__weak void rt_chk_robin (void) {
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/* Check if Round Robin timeout expired and switch to the next ready task.*/
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P_TCB p_new;
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if (os_robin.task != os_rdy.p_lnk) {
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/* New task was suspended, reset Round Robin timeout. */
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os_robin.task = os_rdy.p_lnk;
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os_robin.time = (U16)os_time + os_robin.tout - 1U;
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}
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if (os_robin.time == (U16)os_time) {
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/* Round Robin timeout has expired, swap Robin tasks. */
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os_robin.task = NULL;
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p_new = rt_get_first (&os_rdy);
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rt_put_prio ((P_XCB)&os_rdy, p_new);
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}
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}
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/*----------------------------------------------------------------------------
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* end of file
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*---------------------------------------------------------------------------*/
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