/*---------------------------------------------------------------------------- * CMSIS-RTOS - RTX *---------------------------------------------------------------------------- * Name: RT_ROBIN.C * Purpose: Round Robin Task switching * Rev.: V4.79 *---------------------------------------------------------------------------- * * Copyright (c) 1999-2009 KEIL, 2009-2017 ARM Germany GmbH. All rights reserved. * * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the License); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an AS IS BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *---------------------------------------------------------------------------*/ #include "rt_TypeDef.h" #include "RTX_Config.h" #include "rt_List.h" #include "rt_Task.h" #include "rt_Time.h" #include "rt_Robin.h" #include "rt_HAL_CM.h" /*---------------------------------------------------------------------------- * Global Variables *---------------------------------------------------------------------------*/ struct OS_ROBIN os_robin; /*---------------------------------------------------------------------------- * Global Functions *---------------------------------------------------------------------------*/ /*--------------------------- rt_init_robin ---------------------------------*/ __weak void rt_init_robin (void) { /* Initialize Round Robin variables. */ os_robin.task = NULL; os_robin.tout = (U16)os_rrobin; } /*--------------------------- rt_chk_robin ----------------------------------*/ __weak void rt_chk_robin (void) { /* Check if Round Robin timeout expired and switch to the next ready task.*/ P_TCB p_new; if (os_robin.task != os_rdy.p_lnk) { /* New task was suspended, reset Round Robin timeout. */ os_robin.task = os_rdy.p_lnk; os_robin.time = (U16)os_time + os_robin.tout - 1U; } if (os_robin.time == (U16)os_time) { /* Round Robin timeout has expired, swap Robin tasks. */ os_robin.task = NULL; p_new = rt_get_first (&os_rdy); rt_put_prio ((P_XCB)&os_rdy, p_new); } } /*---------------------------------------------------------------------------- * end of file *---------------------------------------------------------------------------*/